[release-branch.go1.22] go1.22.12

Change-Id: Ib985698fba4e6dab8dc645b115e21a9717bd122c
Reviewed-on: https://go-review.googlesource.com/c/go/+/646479
Auto-Submit: Gopher Robot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
TryBot-Bypass: Cherry Mui <cherryyz@google.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>

VERSION

@@ -0,0 +1,2 @@
+go1.22.12
+time 2025-01-31T18:38:03Z

api/go1.22.txt

@@ -1,13 +1,4 @@
 pkg archive/tar, method (*Writer) AddFS(fs.FS) error #58000
-pkg archive/tar, type FileInfoNames interface { Gname, IsDir, ModTime, Mode, Name, Size, Sys, Uname } #50102
-pkg archive/tar, type FileInfoNames interface, Gname(int) (string, error) #50102
-pkg archive/tar, type FileInfoNames interface, IsDir() bool #50102
-pkg archive/tar, type FileInfoNames interface, ModTime() time.Time #50102
-pkg archive/tar, type FileInfoNames interface, Mode() fs.FileMode #50102
-pkg archive/tar, type FileInfoNames interface, Name() string #50102
-pkg archive/tar, type FileInfoNames interface, Size() int64 #50102
-pkg archive/tar, type FileInfoNames interface, Sys() interface{} #50102
-pkg archive/tar, type FileInfoNames interface, Uname(int) (string, error) #50102
 pkg archive/zip, method (*Writer) AddFS(fs.FS) error #54898
 pkg cmp, func Or[$0 comparable](...$0) $0 #60204
 pkg crypto/x509, func OIDFromInts([]uint64) (OID, error) #60665

codereview.cfg

@@ -1 +1,2 @@
-branch: master
+branch: release-branch.go1.22
+parent-branch: master

doc/go_spec.html

@@ -1,6 +1,6 @@
 <!--{
 	"Title": "The Go Programming Language Specification",
-	"Subtitle": "Version of Dec 27, 2023",
+	"Subtitle": "Language version go1.22 (Feb 6, 2024)",
 	"Path": "/ref/spec"
 }-->
 
@@ -6661,7 +6661,7 @@ array or slice  a  [n]E, *[n]E, or []E    index    i  int    a[i]       E
 string          s  string type            index    i  int    see below  rune
 map             m  map[K]V                key      k  K      m[k]       V
 channel         c  chan E, &lt;-chan E       element  e  E
-integer         n  integer type I         value    i  I
+integer         n  integer type           value    i  see below
 </pre>
 
 <ol>
@@ -6703,26 +6703,33 @@ is <code>nil</code>, the range expression blocks forever.
 
 <li>
 For an integer value <code>n</code>, the iteration values 0 through <code>n-1</code>
-are produced in increasing order, with the same type as <code>n</code>.
+are produced in increasing order.
 If <code>n</code> &lt= 0, the loop does not run any iterations.
 </li>
 </ol>
 
-<p>
-The iteration values are assigned to the respective
-iteration variables as in an <a href="#Assignment_statements">assignment statement</a>.
-</p>
-
 <p>
 The iteration variables may be declared by the "range" clause using a form of
 <a href="#Short_variable_declarations">short variable declaration</a>
 (<code>:=</code>).
-In this case their types are set to the types of the respective iteration values
-and their <a href="#Declarations_and_scope">scope</a> is the block of the "for" statement;
-each iteration has its own separate variables [<a href="#Go_1.22">Go 1.22</a>]
+In this case their <a href="#Declarations_and_scope">scope</a> is the block of the "for" statement
+and each iteration has its own new variables [<a href="#Go_1.22">Go 1.22</a>]
 (see also <a href="#For_clause">"for" statements with a ForClause</a>).
-If the iteration variables are declared outside the “for” statement,
-after execution their values will be those of the last iteration.
+If the range expression is a (possibly untyped) integer expression <code>n</code>,
+the variable has the same type as if it was
+<a href="#Variable_declarations">declared</a> with initialization
+expression <code>n</code>.
+Otherwise, the variables have the types of their respective iteration values.
+</p>
+
+<p>
+If the iteration variables are not explicitly declared by the "range" clause,
+they must be preexisting.
+In this case, the iteration values are assigned to the respective variables
+as in an <a href="#Assignment_statements">assignment statement</a>.
+If the range expression is a (possibly untyped) integer expression <code>n</code>,
+<code>n</code> too must be <a href="#Assignability">assignable</a> to the iteration variable;
+if there is no iteration variable, <code>n</code> must be assignable to <code>int</code>.
 </p>
 
 <pre>
@@ -6765,6 +6772,11 @@ for i := range 10 {
 	// type of i is int (default type for untyped constant 10)
 	f(i)
 }
+
+// invalid: 256 cannot be assigned to uint8
+var u uint8
+for u = range 256 {
+}
 </pre>
 
 

doc/godebug.md

@@ -248,6 +248,13 @@ Go 1.19 made it an error for path lookups to resolve to binaries in the current
 controlled by the [`execerrdot` setting](/pkg/os/exec#hdr-Executables_in_the_current_directory).
 There is no plan to remove this setting.
 
+Go 1.19 started sending EDNS0 additional headers on DNS requests.
+This can reportedly break the DNS server provided on some routers,
+such as CenturyLink Zyxel C3000Z.
+This can be changed by the [`netedns0` setting](/pkg/net#hdr-Name_Resolution).
+This setting is available in Go 1.21.12, Go 1.22.5, Go 1.23, and later.
+There is no plan to remove this setting.
+
 ### Go 1.18
 
 Go 1.18 removed support for SHA1 in most X.509 certificates,

src/archive/tar/common.go

@@ -614,8 +614,6 @@ func (fi headerFileInfo) String() string {
 // sysStat, if non-nil, populates h from system-dependent fields of fi.
 var sysStat func(fi fs.FileInfo, h *Header) error
 
-var loadUidAndGid func(fi fs.FileInfo, uid, gid *int)
-
 const (
 	// Mode constants from the USTAR spec:
 	// See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/pax.html#tag_20_92_13_06
@@ -641,10 +639,6 @@ const (
 // Since fs.FileInfo's Name method only returns the base name of
 // the file it describes, it may be necessary to modify Header.Name
 // to provide the full path name of the file.
-//
-// If fi implements [FileInfoNames]
-// the Gname and Uname of the header are
-// provided by the methods of the interface.
 func FileInfoHeader(fi fs.FileInfo, link string) (*Header, error) {
 	if fi == nil {
 		return nil, errors.New("archive/tar: FileInfo is nil")
@@ -717,38 +711,12 @@ func FileInfoHeader(fi fs.FileInfo, link string) (*Header, error) {
 			}
 		}
 	}
-	if iface, ok := fi.(FileInfoNames); ok {
-		var err error
-		if loadUidAndGid != nil {
-			loadUidAndGid(fi, &h.Uid, &h.Gid)
-		}
-		h.Gname, err = iface.Gname(h.Gid)
-		if err != nil {
-			return nil, err
-		}
-		h.Uname, err = iface.Uname(h.Uid)
-		if err != nil {
-			return nil, err
-		}
-		return h, nil
-	}
 	if sysStat != nil {
 		return h, sysStat(fi, h)
 	}
 	return h, nil
 }
 
-// FileInfoNames extends [FileInfo] to translate UID/GID to names.
-// Passing an instance of this to [FileInfoHeader] permits the caller
-// to control UID/GID resolution.
-type FileInfoNames interface {
-	fs.FileInfo
-	// Uname should translate a UID into a user name.
-	Uname(uid int) (string, error)
-	// Gname should translate a GID into a group name.
-	Gname(gid int) (string, error)
-}
-
 // isHeaderOnlyType checks if the given type flag is of the type that has no
 // data section even if a size is specified.
 func isHeaderOnlyType(flag byte) bool {

src/archive/tar/stat_unix.go

@@ -17,7 +17,6 @@ import (
 
 func init() {
 	sysStat = statUnix
-	loadUidAndGid = loadUidAndGidFunc
 }
 
 // userMap and groupMap caches UID and GID lookups for performance reasons.
@@ -100,12 +99,3 @@ func statUnix(fi fs.FileInfo, h *Header) error {
 	}
 	return nil
 }
-
-func loadUidAndGidFunc(fi fs.FileInfo, uid, gid *int) {
-	sys, ok := fi.Sys().(*syscall.Stat_t)
-	if !ok {
-		return
-	}
-	*uid = int(sys.Uid)
-	*gid = int(sys.Gid)
-}

src/archive/tar/tar_test.go

@@ -848,71 +848,3 @@ func Benchmark(b *testing.B) {
 	})
 
 }
-
-const (
-	testUid = 10
-	testGid = 20
-)
-
-type fileInfoNames struct{}
-
-func (f *fileInfoNames) Name() string {
-	return "tmp"
-}
-
-func (f *fileInfoNames) Size() int64 {
-	return 0
-}
-
-func (f *fileInfoNames) Mode() fs.FileMode {
-	return 0777
-}
-
-func (f *fileInfoNames) ModTime() time.Time {
-	return time.Time{}
-}
-
-func (f *fileInfoNames) IsDir() bool {
-	return false
-}
-
-func (f *fileInfoNames) Sys() any {
-	return nil
-}
-
-func (f *fileInfoNames) Uname(uid int) (string, error) {
-	if uid == testUid {
-		return "Uname", nil
-	}
-	return "", nil
-}
-
-func (f *fileInfoNames) Gname(gid int) (string, error) {
-	if gid == testGid {
-		return "Gname", nil
-	}
-	return "", nil
-}
-
-func TestFileInfoHeaderUseFileInfoNames(t *testing.T) {
-	origLoadUidAndGid := loadUidAndGid
-	defer func() {
-		loadUidAndGid = origLoadUidAndGid
-	}()
-	loadUidAndGid = func(fi fs.FileInfo, uid, gid *int) {
-		*uid = testUid
-		*gid = testGid
-	}
-
-	info := &fileInfoNames{}
-	header, err := FileInfoHeader(info, "")
-	if err != nil {
-		t.Fatal(err)
-	}
-	if header.Uname != "Uname" {
-		t.Fatalf("header.Uname: got %v, want %v", header.Uname, "Uname")
-	}
-	if header.Gname != "Gname" {
-		t.Fatalf("header.Gname: got %v, want %v", header.Gname, "Gname")
-	}
-}

src/archive/zip/reader.go

@@ -699,9 +699,13 @@ func findSignatureInBlock(b []byte) int {
 		if b[i] == 'P' && b[i+1] == 'K' && b[i+2] == 0x05 && b[i+3] == 0x06 {
 			// n is length of comment
 			n := int(b[i+directoryEndLen-2]) | int(b[i+directoryEndLen-1])<<8
-			if n+directoryEndLen+i <= len(b) {
-				return i
+			if n+directoryEndLen+i > len(b) {
+				// Truncated comment.
+				// Some parsers (such as Info-ZIP) ignore the truncated comment
+				// rather than treating it as a hard error.
+				return -1
 			}
+			return i
 		}
 	}
 	return -1

src/archive/zip/reader_test.go

@@ -570,6 +570,14 @@ var tests = []ZipTest{
 			},
 		},
 	},
+	// Issue 66869: Don't skip over an EOCDR with a truncated comment.
+	// The test file sneakily hides a second EOCDR before the first one;
+	// previously we would extract one file ("file") from this archive,
+	// while most other tools would reject the file or extract a different one ("FILE").
+	{
+		Name:  "comment-truncated.zip",
+		Error: ErrFormat,
+	},
 }
 
 func TestReader(t *testing.T) {

src/bytes/bytes_js_wasm_test.go

@@ -0,0 +1,21 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build js && wasm
+
+package bytes_test
+
+import (
+	"bytes"
+	"testing"
+)
+
+func TestIssue65571(t *testing.T) {
+	b := make([]byte, 1<<31+1)
+	b[1<<31] = 1
+	i := bytes.IndexByte(b, 1)
+	if i != 1<<31 {
+		t.Errorf("IndexByte(b, 1) = %d; want %d", i, 1<<31)
+	}
+}

src/cmd/asm/internal/asm/testdata/ppc64.s

@@ -52,6 +52,9 @@ TEXT asmtest(SB),DUPOK|NOSPLIT,$0
 	// Hex constant 0xFFFFFFFE00000001
 	MOVD $-8589934591, R5           // 38a0ffff or 0602000038a00001
 
+	// For #66955. Verify this opcode turns into a load and assembles.
+	MOVD $-6795364578871345152, R5  // 3ca00000e8a50000 or 04100000e4a00000
+
 	MOVD 8(R3), R4                  // e8830008
 	MOVD (R3)(R4), R5               // 7ca4182a
 	MOVD (R3)(R0), R5               // 7ca0182a
@@ -90,6 +93,7 @@ TEXT asmtest(SB),DUPOK|NOSPLIT,$0
 	MOVHBR (R3)(R4), R5             // 7ca41e2c
 	MOVHBR (R3)(R0), R5             // 7ca01e2c
 	MOVHBR (R3), R5                 // 7ca01e2c
+	OR $0, R0, R0
 	MOVD $foo+4009806848(FP), R5    // 3ca1ef0138a5cc40 or 0600ef0038a1cc40
 	MOVD $foo(SB), R5               // 3ca0000038a50000 or 0610000038a00000
 

src/cmd/cgo/gcc.go

@@ -2579,6 +2579,11 @@ func (c *typeConv) loadType(dtype dwarf.Type, pos token.Pos, parent string) *Typ
 		if dt.BitSize > 0 {
 			fatalf("%s: unexpected: %d-bit int type - %s", lineno(pos), dt.BitSize, dtype)
 		}
+
+		if t.Align = t.Size; t.Align >= c.ptrSize {
+			t.Align = c.ptrSize
+		}
+
 		switch t.Size {
 		default:
 			fatalf("%s: unexpected: %d-byte int type - %s", lineno(pos), t.Size, dtype)
@@ -2595,9 +2600,8 @@ func (c *typeConv) loadType(dtype dwarf.Type, pos token.Pos, parent string) *Typ
 				Len: c.intExpr(t.Size),
 				Elt: c.uint8,
 			}
-		}
-		if t.Align = t.Size; t.Align >= c.ptrSize {
-			t.Align = c.ptrSize
+			// t.Align is the alignment of the Go type.
+			t.Align = 1
 		}
 
 	case *dwarf.PtrType:
@@ -2826,6 +2830,11 @@ func (c *typeConv) loadType(dtype dwarf.Type, pos token.Pos, parent string) *Typ
 		if dt.BitSize > 0 {
 			fatalf("%s: unexpected: %d-bit uint type - %s", lineno(pos), dt.BitSize, dtype)
 		}
+
+		if t.Align = t.Size; t.Align >= c.ptrSize {
+			t.Align = c.ptrSize
+		}
+
 		switch t.Size {
 		default:
 			fatalf("%s: unexpected: %d-byte uint type - %s", lineno(pos), t.Size, dtype)
@@ -2842,9 +2851,8 @@ func (c *typeConv) loadType(dtype dwarf.Type, pos token.Pos, parent string) *Typ
 				Len: c.intExpr(t.Size),
 				Elt: c.uint8,
 			}
-		}
-		if t.Align = t.Size; t.Align >= c.ptrSize {
-			t.Align = c.ptrSize
+			// t.Align is the alignment of the Go type.
+			t.Align = 1
 		}
 
 	case *dwarf.VoidType:
@@ -3110,10 +3118,11 @@ func (c *typeConv) Struct(dt *dwarf.StructType, pos token.Pos) (expr *ast.Struct
 		}
 
 		// Round off up to talign, assumed to be a power of 2.
+		origOff := off
 		off = (off + talign - 1) &^ (talign - 1)
 
 		if f.ByteOffset > off {
-			fld, sizes = c.pad(fld, sizes, f.ByteOffset-off)
+			fld, sizes = c.pad(fld, sizes, f.ByteOffset-origOff)
 			off = f.ByteOffset
 		}
 		if f.ByteOffset < off {

src/cmd/cgo/internal/swig/swig_test.go

@@ -44,11 +44,18 @@ func run(t *testing.T, dir string, lto bool, args ...string) {
 	cmd := exec.Command("go", runArgs...)
 	cmd.Dir = dir
 	if lto {
+		// On the builders we're using the default /usr/bin/ld, but
+		// that has problems when asking for LTO in particular. Force
+		// use of lld, which ships with our clang installation.
+		extraLDFlags := ""
+		if strings.Contains(testenv.Builder(), "clang") {
+			extraLDFlags += " -fuse-ld=lld"
+		}
 		const cflags = "-flto -Wno-lto-type-mismatch -Wno-unknown-warning-option"
 		cmd.Env = append(cmd.Environ(),
 			"CGO_CFLAGS="+cflags,
 			"CGO_CXXFLAGS="+cflags,
-			"CGO_LDFLAGS="+cflags)
+			"CGO_LDFLAGS="+cflags+extraLDFlags)
 	}
 	out, err := cmd.CombinedOutput()
 	if string(out) != "OK\n" {

src/cmd/cgo/internal/test/cgo_test.go

@@ -70,6 +70,7 @@ func Test31891(t *testing.T)                 { test31891(t) }
 func Test42018(t *testing.T)                 { test42018(t) }
 func Test45451(t *testing.T)                 { test45451(t) }
 func Test49633(t *testing.T)                 { test49633(t) }
+func Test69086(t *testing.T)                 { test69086(t) }
 func TestAlign(t *testing.T)                 { testAlign(t) }
 func TestAtol(t *testing.T)                  { testAtol(t) }
 func TestBlocking(t *testing.T)              { testBlocking(t) }

src/cmd/cgo/internal/test/seh_internal_windows_test.go

@@ -0,0 +1,16 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build cgo && windows && internal
+
+package cgotest
+
+import (
+	"internal/testenv"
+	"testing"
+)
+
+func TestCallbackCallersSEH(t *testing.T) {
+	testenv.SkipFlaky(t, 65116)
+}

src/cmd/cgo/internal/test/seh_windows_test.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build cgo && windows
+//go:build cgo && windows && !internal
 
 package cgotest
 

src/cmd/cgo/internal/test/test.go

@@ -933,6 +933,19 @@ typedef struct issue45451Undefined issue45451;
 extern void GoFunc49633(void*);
 void cfunc49633(void *context) { GoFunc49633(context); }
 
+// Issue 69086.
+// GCC added the __int128 type in GCC 4.6, released in 2011.
+typedef struct {
+	int a;
+#ifdef __SIZEOF_INT128__
+	unsigned __int128 b;
+#else
+	uint64_t b;
+#endif
+	unsigned char c;
+} issue69086struct;
+static int issue690861(issue69086struct* p) { p->b = 1234; return p->c; }
+static int issue690862(unsigned long ul1, unsigned long ul2, unsigned int u, issue69086struct s) { return (int)(s.b); }
 */
 import "C"
 
@@ -2321,3 +2334,24 @@ func test45451(t *testing.T) {
 func func52542[T ~[]C.int]() {}
 
 type type52542[T ~*C.float] struct{}
+
+// Issue 69086.
+func test69086(t *testing.T) {
+	var s C.issue69086struct
+
+	typ := reflect.TypeOf(s)
+	for i := 0; i < typ.NumField(); i++ {
+		f := typ.Field(i)
+		t.Logf("field %d: name %s size %d align %d offset %d", i, f.Name, f.Type.Size(), f.Type.Align(), f.Offset)
+	}
+
+	s.c = 1
+	got := C.issue690861(&s)
+	if got != 1 {
+		t.Errorf("field: got %d, want 1", got)
+	}
+	got = C.issue690862(1, 2, 3, s)
+	if got != 1234 {
+		t.Errorf("call: got %d, want 1234", got)
+	}
+}

src/cmd/cgo/internal/testcarchive/carchive_test.go

@@ -1224,7 +1224,7 @@ func TestManyCalls(t *testing.T) {
 	}
 
 	argv := cmdToRun("./testp7")
-	cmd = exec.Command(argv[0], argv[1:]...)
+	cmd = testenv.Command(t, argv[0], argv[1:]...)
 	sb := new(strings.Builder)
 	cmd.Stdout = sb
 	cmd.Stderr = sb
@@ -1232,14 +1232,6 @@ func TestManyCalls(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	timer := time.AfterFunc(time.Minute,
-		func() {
-			t.Error("test program timed out")
-			cmd.Process.Kill()
-		},
-	)
-	defer timer.Stop()
-
 	err = cmd.Wait()
 	t.Logf("%v\n%s", cmd.Args, sb)
 	if err != nil {
@@ -1284,7 +1276,7 @@ func TestPreemption(t *testing.T) {
 	}
 
 	argv := cmdToRun("./testp8")
-	cmd = exec.Command(argv[0], argv[1:]...)
+	cmd = testenv.Command(t, argv[0], argv[1:]...)
 	sb := new(strings.Builder)
 	cmd.Stdout = sb
 	cmd.Stderr = sb
@@ -1292,14 +1284,6 @@ func TestPreemption(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	timer := time.AfterFunc(time.Minute,
-		func() {
-			t.Error("test program timed out")
-			cmd.Process.Kill()
-		},
-	)
-	defer timer.Stop()
-
 	err = cmd.Wait()
 	t.Logf("%v\n%s", cmd.Args, sb)
 	if err != nil {

src/cmd/cgo/internal/testplugin/plugin_test.go

@@ -74,6 +74,7 @@ func testMain(m *testing.M) int {
 	}
 	defer os.RemoveAll(GOPATH)
 	tmpDir = GOPATH
+	fmt.Printf("TMPDIR=%s\n", tmpDir)
 
 	modRoot := filepath.Join(GOPATH, "src", "testplugin")
 	altRoot := filepath.Join(GOPATH, "alt", "src", "testplugin")
@@ -395,3 +396,29 @@ func TestIssue62430(t *testing.T) {
 	goCmd(t, "build", "-o", "issue62430.exe", "./issue62430/main.go")
 	run(t, "./issue62430.exe")
 }
+
+func TestTextSectionSplit(t *testing.T) {
+	globalSkip(t)
+	if runtime.GOOS != "darwin" || runtime.GOARCH != "arm64" {
+		t.Skipf("text section splitting is not done in %s/%s", runtime.GOOS, runtime.GOARCH)
+	}
+
+	// Use -ldflags=-debugtextsize=262144 to let the linker split text section
+	// at a smaller size threshold, so it actually splits for the test binary.
+	goCmd(nil, "build", "-ldflags=-debugtextsize=262144", "-o", "host-split.exe", "./host")
+	run(t, "./host-split.exe")
+
+	// Check that we did split text sections.
+	syms := goCmd(nil, "tool", "nm", "host-split.exe")
+	if !strings.Contains(syms, "runtime.text.1") {
+		t.Errorf("runtime.text.1 not found, text section not split?")
+	}
+}
+
+func TestIssue67976(t *testing.T) {
+	// Issue 67976: build failure with loading a dynimport variable (the runtime/pprof
+	// package does this on darwin) in a plugin on darwin/amd64.
+	// The test program uses runtime/pprof in a plugin.
+	globalSkip(t)
+	goCmd(t, "build", "-buildmode=plugin", "-o", "issue67976.so", "./issue67976/plugin.go")
+}

src/cmd/cgo/internal/testplugin/testdata/issue67976/plugin.go

@@ -0,0 +1,16 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import (
+	"io"
+	"runtime/pprof"
+)
+
+func main() {}
+
+func Start() {
+	pprof.StartCPUProfile(io.Discard)
+}

src/cmd/cgo/internal/testsanitizers/cc_test.go

@@ -16,8 +16,10 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"internal/testenv"
 	"os"
 	"os/exec"
+	"os/user"
 	"path/filepath"
 	"regexp"
 	"strconv"
@@ -266,12 +268,28 @@ func compilerSupportsLocation() bool {
 	case "gcc":
 		return compiler.major >= 10
 	case "clang":
+		// TODO(65606): The clang toolchain on the LUCI builders is not built against
+		// zlib, the ASAN runtime can't actually symbolize its own stack trace. Once
+		// this is resolved, one way or another, switch this back to 'true'. We still
+		// have coverage from the 'gcc' case above.
+		if inLUCIBuild() {
+			return false
+		}
 		return true
 	default:
 		return false
 	}
 }
 
+// inLUCIBuild returns true if we're currently executing in a LUCI build.
+func inLUCIBuild() bool {
+	u, err := user.Current()
+	if err != nil {
+		return false
+	}
+	return testenv.Builder() != "" && u.Username == "swarming"
+}
+
 // compilerRequiredTsanVersion reports whether the compiler is the version required by Tsan.
 // Only restrictions for ppc64le are known; otherwise return true.
 func compilerRequiredTsanVersion(goos, goarch string) bool {

src/cmd/cgo/internal/testsanitizers/libfuzzer_test.go

@@ -13,8 +13,13 @@ import (
 )
 
 func TestLibFuzzer(t *testing.T) {
+	// Skip tests in short mode.
+	if testing.Short() {
+		t.Skip("libfuzzer tests can take upwards of minutes to run; skipping in short mode")
+	}
 	testenv.MustHaveGoBuild(t)
 	testenv.MustHaveCGO(t)
+
 	goos, err := goEnv("GOOS")
 	if err != nil {
 		t.Fatal(err)

src/cmd/compile/internal/compare/compare.go

@@ -148,7 +148,7 @@ func calculateCostForType(t *types.Type) int64 {
 		return EqStructCost(t)
 	case types.TSLICE:
 		// Slices are not comparable.
-		base.Fatalf("eqStructFieldCost: unexpected slice type")
+		base.Fatalf("calculateCostForType: unexpected slice type")
 	case types.TARRAY:
 		elemCost := calculateCostForType(t.Elem())
 		cost = t.NumElem() * elemCost
@@ -371,6 +371,11 @@ func eqmem(p, q ir.Node, field int, size int64) ir.Node {
 }
 
 func eqmemfunc(size int64, t *types.Type) (fn *ir.Name, needsize bool) {
+	if !base.Ctxt.Arch.CanMergeLoads && t.Alignment() < int64(base.Ctxt.Arch.Alignment) && t.Alignment() < t.Size() {
+		// We can't use larger comparisons if the value might not be aligned
+		// enough for the larger comparison. See issues 46283 and 67160.
+		size = 0
+	}
 	switch size {
 	case 1, 2, 4, 8, 16:
 		buf := fmt.Sprintf("memequal%d", int(size)*8)

src/cmd/compile/internal/noder/irgen.go

@@ -34,7 +34,13 @@ func checkFiles(m posMap, noders []*noder) (*types2.Package, *types2.Info) {
 	posBaseMap := make(map[*syntax.PosBase]*syntax.File)
 	for i, p := range noders {
 		files[i] = p.file
-		posBaseMap[p.file.Pos().Base()] = p.file
+		// The file.Pos() is the position of the package clause.
+		// If there's a //line directive before that, file.Pos().Base()
+		// refers to that directive, not the file itself.
+		// Make sure to consistently map back to file base, here and
+		// when we look for a file in the conf.Error handler below,
+		// otherwise the file may not be found (was go.dev/issue/67141).
+		posBaseMap[fileBase(p.file.Pos())] = p.file
 	}
 
 	// typechecking
@@ -68,13 +74,12 @@ func checkFiles(m posMap, noders []*noder) (*types2.Package, *types2.Info) {
 		terr := err.(types2.Error)
 		msg := terr.Msg
 		if versionErrorRx.MatchString(msg) {
-			posBase := terr.Pos.Base()
-			for !posBase.IsFileBase() { // line directive base
-				posBase = posBase.Pos().Base()
-			}
+			posBase := fileBase(terr.Pos)
 			fileVersion := info.FileVersions[posBase]
 			file := posBaseMap[posBase]
-			if file.GoVersion == fileVersion {
+			if file == nil {
+				// This should never happen, but be careful and don't crash.
+			} else if file.GoVersion == fileVersion {
 				// If we have a version error caused by //go:build, report it.
 				msg = fmt.Sprintf("%s (file declares //go:build %s)", msg, fileVersion)
 			} else {
@@ -149,6 +154,15 @@ func checkFiles(m posMap, noders []*noder) (*types2.Package, *types2.Info) {
 	return pkg, info
 }
 
+// fileBase returns a file's position base given a position in the file.
+func fileBase(pos syntax.Pos) *syntax.PosBase {
+	base := pos.Base()
+	for !base.IsFileBase() { // line directive base
+		base = base.Pos().Base()
+	}
+	return base
+}
+
 // A cycleFinder detects anonymous interface cycles (go.dev/issue/56103).
 type cycleFinder struct {
 	cyclic map[*types2.Interface]bool

src/cmd/compile/internal/noder/reader.go

@@ -663,9 +663,24 @@ func (pr *pkgReader) objInstIdx(info objInfo, dict *readerDict, shaped bool) ir.
 }
 
 // objIdx returns the specified object, instantiated with the given
-// type arguments, if any. If shaped is true, then the shaped variant
-// of the object is returned instead.
+// type arguments, if any.
+// If shaped is true, then the shaped variant of the object is returned
+// instead.
 func (pr *pkgReader) objIdx(idx pkgbits.Index, implicits, explicits []*types.Type, shaped bool) ir.Node {
+	n, err := pr.objIdxMayFail(idx, implicits, explicits, shaped)
+	if err != nil {
+		base.Fatalf("%v", err)
+	}
+	return n
+}
+
+// objIdxMayFail is equivalent to objIdx, but returns an error rather than
+// failing the build if this object requires type arguments and the incorrect
+// number of type arguments were passed.
+//
+// Other sources of internal failure (such as duplicate definitions) still fail
+// the build.
+func (pr *pkgReader) objIdxMayFail(idx pkgbits.Index, implicits, explicits []*types.Type, shaped bool) (ir.Node, error) {
 	rname := pr.newReader(pkgbits.RelocName, idx, pkgbits.SyncObject1)
 	_, sym := rname.qualifiedIdent()
 	tag := pkgbits.CodeObj(rname.Code(pkgbits.SyncCodeObj))
@@ -674,22 +689,25 @@ func (pr *pkgReader) objIdx(idx pkgbits.Index, implicits, explicits []*types.Typ
 		assert(!sym.IsBlank())
 		switch sym.Pkg {
 		case types.BuiltinPkg, types.UnsafePkg:
-			return sym.Def.(ir.Node)
+			return sym.Def.(ir.Node), nil
 		}
 		if pri, ok := objReader[sym]; ok {
-			return pri.pr.objIdx(pri.idx, nil, explicits, shaped)
+			return pri.pr.objIdxMayFail(pri.idx, nil, explicits, shaped)
 		}
 		if sym.Pkg.Path == "runtime" {
-			return typecheck.LookupRuntime(sym.Name)
+			return typecheck.LookupRuntime(sym.Name), nil
 		}
 		base.Fatalf("unresolved stub: %v", sym)
 	}
 
-	dict := pr.objDictIdx(sym, idx, implicits, explicits, shaped)
+	dict, err := pr.objDictIdx(sym, idx, implicits, explicits, shaped)
+	if err != nil {
+		return nil, err
+	}
 
 	sym = dict.baseSym
 	if !sym.IsBlank() && sym.Def != nil {
-		return sym.Def.(*ir.Name)
+		return sym.Def.(*ir.Name), nil
 	}
 
 	r := pr.newReader(pkgbits.RelocObj, idx, pkgbits.SyncObject1)
@@ -725,7 +743,7 @@ func (pr *pkgReader) objIdx(idx pkgbits.Index, implicits, explicits []*types.Typ
 		name := do(ir.OTYPE, false)
 		setType(name, r.typ())
 		name.SetAlias(true)
-		return name
+		return name, nil
 
 	case pkgbits.ObjConst:
 		name := do(ir.OLITERAL, false)
@@ -733,7 +751,7 @@ func (pr *pkgReader) objIdx(idx pkgbits.Index, implicits, explicits []*types.Typ
 		val := FixValue(typ, r.Value())
 		setType(name, typ)
 		setValue(name, val)
-		return name
+		return name, nil
 
 	case pkgbits.ObjFunc:
 		if sym.Name == "init" {
@@ -768,7 +786,7 @@ func (pr *pkgReader) objIdx(idx pkgbits.Index, implicits, explicits []*types.Typ
 		}
 
 		rext.funcExt(name, nil)
-		return name
+		return name, nil
 
 	case pkgbits.ObjType:
 		name := do(ir.OTYPE, true)
@@ -805,13 +823,13 @@ func (pr *pkgReader) objIdx(idx pkgbits.Index, implicits, explicits []*types.Typ
 			r.needWrapper(typ)
 		}
 
-		return name
+		return name, nil
 
 	case pkgbits.ObjVar:
 		name := do(ir.ONAME, false)
 		setType(name, r.typ())
 		rext.varExt(name)
-		return name
+		return name, nil
 	}
 }
 
@@ -908,7 +926,7 @@ func shapify(targ *types.Type, basic bool) *types.Type {
 }
 
 // objDictIdx reads and returns the specified object dictionary.
-func (pr *pkgReader) objDictIdx(sym *types.Sym, idx pkgbits.Index, implicits, explicits []*types.Type, shaped bool) *readerDict {
+func (pr *pkgReader) objDictIdx(sym *types.Sym, idx pkgbits.Index, implicits, explicits []*types.Type, shaped bool) (*readerDict, error) {
 	r := pr.newReader(pkgbits.RelocObjDict, idx, pkgbits.SyncObject1)
 
 	dict := readerDict{
@@ -919,7 +937,7 @@ func (pr *pkgReader) objDictIdx(sym *types.Sym, idx pkgbits.Index, implicits, ex
 	nexplicits := r.Len()
 
 	if nimplicits > len(implicits) || nexplicits != len(explicits) {
-		base.Fatalf("%v has %v+%v params, but instantiated with %v+%v args", sym, nimplicits, nexplicits, len(implicits), len(explicits))
+		return nil, fmt.Errorf("%v has %v+%v params, but instantiated with %v+%v args", sym, nimplicits, nexplicits, len(implicits), len(explicits))
 	}
 
 	dict.targs = append(implicits[:nimplicits:nimplicits], explicits...)
@@ -984,7 +1002,7 @@ func (pr *pkgReader) objDictIdx(sym *types.Sym, idx pkgbits.Index, implicits, ex
 		dict.itabs[i] = itabInfo{typ: r.typInfo(), iface: r.typInfo()}
 	}
 
-	return &dict
+	return &dict, nil
 }
 
 func (r *reader) typeParamNames() {
@@ -2529,7 +2547,10 @@ func (pr *pkgReader) objDictName(idx pkgbits.Index, implicits, explicits []*type
 		base.Fatalf("unresolved stub: %v", sym)
 	}
 
-	dict := pr.objDictIdx(sym, idx, implicits, explicits, false)
+	dict, err := pr.objDictIdx(sym, idx, implicits, explicits, false)
+	if err != nil {
+		base.Fatalf("%v", err)
+	}
 
 	return pr.dictNameOf(dict)
 }

src/cmd/compile/internal/noder/unified.go

@@ -80,7 +80,11 @@ func lookupFunction(pkg *types.Pkg, symName string) (*ir.Func, error) {
 		return nil, fmt.Errorf("func sym %v missing objReader", sym)
 	}
 
-	name := pri.pr.objIdx(pri.idx, nil, nil, false).(*ir.Name)
+	node, err := pri.pr.objIdxMayFail(pri.idx, nil, nil, false)
+	if err != nil {
+		return nil, fmt.Errorf("func sym %v lookup error: %w", sym, err)
+	}
+	name := node.(*ir.Name)
 	if name.Op() != ir.ONAME || name.Class != ir.PFUNC {
 		return nil, fmt.Errorf("func sym %v refers to non-function name: %v", sym, name)
 	}
@@ -105,13 +109,20 @@ func lookupMethod(pkg *types.Pkg, symName string) (*ir.Func, error) {
 		return nil, fmt.Errorf("type sym %v missing objReader", typ)
 	}
 
-	name := pri.pr.objIdx(pri.idx, nil, nil, false).(*ir.Name)
+	node, err := pri.pr.objIdxMayFail(pri.idx, nil, nil, false)
+	if err != nil {
+		return nil, fmt.Errorf("func sym %v lookup error: %w", typ, err)
+	}
+	name := node.(*ir.Name)
 	if name.Op() != ir.OTYPE {
 		return nil, fmt.Errorf("type sym %v refers to non-type name: %v", typ, name)
 	}
 	if name.Alias() {
 		return nil, fmt.Errorf("type sym %v refers to alias", typ)
 	}
+	if name.Type().IsInterface() {
+		return nil, fmt.Errorf("type sym %v refers to interface type", typ)
+	}
 
 	for _, m := range name.Type().Methods() {
 		if m.Sym == meth {

src/cmd/compile/internal/noder/writer.go

@@ -1209,10 +1209,17 @@ func (w *writer) stmt(stmt syntax.Stmt) {
 func (w *writer) stmts(stmts []syntax.Stmt) {
 	dead := false
 	w.Sync(pkgbits.SyncStmts)
-	for _, stmt := range stmts {
-		if dead {
-			// Any statements after a terminating statement are safe to
-			// omit, at least until the next labeled statement.
+	var lastLabel = -1
+	for i, stmt := range stmts {
+		if _, ok := stmt.(*syntax.LabeledStmt); ok {
+			lastLabel = i
+		}
+	}
+	for i, stmt := range stmts {
+		if dead && i > lastLabel {
+			// Any statements after a terminating and last label statement are safe to omit.
+			// Otherwise, code after label statement may refer to dead stmts between terminating
+			// and label statement, see issue #65593.
 			if _, ok := stmt.(*syntax.LabeledStmt); !ok {
 				continue
 			}

src/cmd/compile/internal/ssa/_gen/AMD64.rules

@@ -1020,10 +1020,6 @@
 (MOVLQZX x:(MOVLload [off] {sym} ptr mem)) && x.Uses == 1 && clobber(x) => @x.Block (MOVLload <v.Type> [off] {sym} ptr mem)
 (MOVLQZX x:(MOVQload [off] {sym} ptr mem)) && x.Uses == 1 && clobber(x) => @x.Block (MOVLload <v.Type> [off] {sym} ptr mem)
 
-(MOVLQZX x) && zeroUpper32Bits(x,3) => x
-(MOVWQZX x) && zeroUpper48Bits(x,3) => x
-(MOVBQZX x) && zeroUpper56Bits(x,3) => x
-
 // replace load from same location as preceding store with zero/sign extension (or copy in case of full width)
 (MOVBload [off] {sym} ptr (MOVBstore [off2] {sym2} ptr2 x _)) && sym == sym2 && off == off2 && isSamePtr(ptr, ptr2) => (MOVBQZX x)
 (MOVWload [off] {sym} ptr (MOVWstore [off2] {sym2} ptr2 x _)) && sym == sym2 && off == off2 && isSamePtr(ptr, ptr2) => (MOVWQZX x)

src/cmd/compile/internal/ssa/_gen/AMD64latelower.rules

@@ -6,3 +6,8 @@
 (SAR(Q|L) x y) && buildcfg.GOAMD64 >= 3 => (SARX(Q|L) x y)
 (SHL(Q|L) x y) && buildcfg.GOAMD64 >= 3 => (SHLX(Q|L) x y)
 (SHR(Q|L) x y) && buildcfg.GOAMD64 >= 3 => (SHRX(Q|L) x y)
+
+// See comments in ARM64latelower.rules for why these are here.
+(MOVLQZX x) && zeroUpper32Bits(x,3) => x
+(MOVWQZX x) && zeroUpper48Bits(x,3) => x
+(MOVBQZX x) && zeroUpper56Bits(x,3) => x

src/cmd/compile/internal/ssa/_gen/ARM64.rules

@@ -1054,61 +1054,6 @@
 (MOVWUloadidx4 ptr idx (MOVWstorezeroidx4 ptr2 idx2 _)) && isSamePtr(ptr, ptr2) && isSamePtr(idx, idx2) => (MOVDconst [0])
 (MOVDloadidx8  ptr idx (MOVDstorezeroidx8 ptr2 idx2 _)) && isSamePtr(ptr, ptr2) && isSamePtr(idx, idx2) => (MOVDconst [0])
 
-// don't extend after proper load
-(MOVBreg  x:(MOVBload  _ _)) => (MOVDreg x)
-(MOVBUreg x:(MOVBUload _ _)) => (MOVDreg x)
-(MOVHreg  x:(MOVBload  _ _)) => (MOVDreg x)
-(MOVHreg  x:(MOVBUload _ _)) => (MOVDreg x)
-(MOVHreg  x:(MOVHload  _ _)) => (MOVDreg x)
-(MOVHUreg x:(MOVBUload _ _)) => (MOVDreg x)
-(MOVHUreg x:(MOVHUload _ _)) => (MOVDreg x)
-(MOVWreg  x:(MOVBload  _ _)) => (MOVDreg x)
-(MOVWreg  x:(MOVBUload _ _)) => (MOVDreg x)
-(MOVWreg  x:(MOVHload  _ _)) => (MOVDreg x)
-(MOVWreg  x:(MOVHUload _ _)) => (MOVDreg x)
-(MOVWreg  x:(MOVWload  _ _)) => (MOVDreg x)
-(MOVWUreg x:(MOVBUload _ _)) => (MOVDreg x)
-(MOVWUreg x:(MOVHUload _ _)) => (MOVDreg x)
-(MOVWUreg x:(MOVWUload _ _)) => (MOVDreg x)
-(MOVBreg  x:(MOVBloadidx  _  _ _)) => (MOVDreg x)
-(MOVBUreg x:(MOVBUloadidx  _ _ _)) => (MOVDreg x)
-(MOVHreg  x:(MOVBloadidx   _ _ _)) => (MOVDreg x)
-(MOVHreg  x:(MOVBUloadidx  _ _ _)) => (MOVDreg x)
-(MOVHreg  x:(MOVHloadidx   _ _ _)) => (MOVDreg x)
-(MOVHUreg x:(MOVBUloadidx  _ _ _)) => (MOVDreg x)
-(MOVHUreg x:(MOVHUloadidx  _ _ _)) => (MOVDreg x)
-(MOVWreg  x:(MOVBloadidx   _ _ _)) => (MOVDreg x)
-(MOVWreg  x:(MOVBUloadidx  _ _ _)) => (MOVDreg x)
-(MOVWreg  x:(MOVHloadidx   _ _ _)) => (MOVDreg x)
-(MOVWreg  x:(MOVHUloadidx  _ _ _)) => (MOVDreg x)
-(MOVWreg  x:(MOVWloadidx   _ _ _)) => (MOVDreg x)
-(MOVWUreg x:(MOVBUloadidx  _ _ _)) => (MOVDreg x)
-(MOVWUreg x:(MOVHUloadidx  _ _ _)) => (MOVDreg x)
-(MOVWUreg x:(MOVWUloadidx  _ _ _)) => (MOVDreg x)
-(MOVHreg  x:(MOVHloadidx2  _ _ _)) => (MOVDreg x)
-(MOVHUreg x:(MOVHUloadidx2 _ _ _)) => (MOVDreg x)
-(MOVWreg  x:(MOVHloadidx2  _ _ _)) => (MOVDreg x)
-(MOVWreg  x:(MOVHUloadidx2 _ _ _)) => (MOVDreg x)
-(MOVWreg  x:(MOVWloadidx4  _ _ _)) => (MOVDreg x)
-(MOVWUreg x:(MOVHUloadidx2 _ _ _)) => (MOVDreg x)
-(MOVWUreg x:(MOVWUloadidx4 _ _ _)) => (MOVDreg x)
-
-// fold double extensions
-(MOVBreg  x:(MOVBreg  _)) => (MOVDreg x)
-(MOVBUreg x:(MOVBUreg _)) => (MOVDreg x)
-(MOVHreg  x:(MOVBreg  _)) => (MOVDreg x)
-(MOVHreg  x:(MOVBUreg _)) => (MOVDreg x)
-(MOVHreg  x:(MOVHreg  _)) => (MOVDreg x)
-(MOVHUreg x:(MOVBUreg _)) => (MOVDreg x)
-(MOVHUreg x:(MOVHUreg _)) => (MOVDreg x)
-(MOVWreg  x:(MOVBreg  _)) => (MOVDreg x)
-(MOVWreg  x:(MOVBUreg _)) => (MOVDreg x)
-(MOVWreg  x:(MOVHreg  _)) => (MOVDreg x)
-(MOVWreg  x:(MOVWreg  _)) => (MOVDreg x)
-(MOVWUreg x:(MOVBUreg _)) => (MOVDreg x)
-(MOVWUreg x:(MOVHUreg _)) => (MOVDreg x)
-(MOVWUreg x:(MOVWUreg _)) => (MOVDreg x)
-
 // don't extend before store
 (MOVBstore [off] {sym} ptr (MOVBreg  x) mem) => (MOVBstore [off] {sym} ptr x mem)
 (MOVBstore [off] {sym} ptr (MOVBUreg x) mem) => (MOVBstore [off] {sym} ptr x mem)
@@ -1572,18 +1517,11 @@
 (LessThanNoov     (InvertFlags x)) => (CSEL0 [OpARM64NotEqual] (GreaterEqualNoov <typ.Bool> x) x)
 (GreaterEqualNoov (InvertFlags x)) => (CSINC [OpARM64NotEqual] (LessThanNoov <typ.Bool> x) (MOVDconst [0]) x)
 
-// Boolean-generating instructions (NOTE: NOT all boolean Values) always
-// zero upper bit of the register; no need to zero-extend
-(MOVBUreg x:((Equal|NotEqual|LessThan|LessThanU|LessThanF|LessEqual|LessEqualU|LessEqualF|GreaterThan|GreaterThanU|GreaterThanF|GreaterEqual|GreaterEqualU|GreaterEqualF) _)) => (MOVDreg x)
-
 // Don't bother extending if we're not using the higher bits.
 (MOV(B|BU)reg x) && v.Type.Size() <= 1 => x
 (MOV(H|HU)reg x) && v.Type.Size() <= 2 => x
 (MOV(W|WU)reg x) && v.Type.Size() <= 4 => x
 
-// omit unsign extension
-(MOVWUreg x) && zeroUpper32Bits(x, 3) => x
-
 // omit sign extension
 (MOVWreg <t> (ANDconst x [c])) && uint64(c) & uint64(0xffffffff80000000) == 0 => (ANDconst <t> x [c])
 (MOVHreg <t> (ANDconst x [c])) && uint64(c) & uint64(0xffffffffffff8000) == 0 => (ANDconst <t> x [c])

src/cmd/compile/internal/ssa/_gen/ARM64latelower.rules

@@ -19,3 +19,69 @@
 (CMNWconst [c] x) && !isARM64addcon(int64(c))  => (CMNW x (MOVDconst [int64(c)]))
 
 (ADDSconstflags [c] x) && !isARM64addcon(c)  => (ADDSflags x (MOVDconst [c]))
+
+// These rules remove unneeded sign/zero extensions.
+// They occur in late lower because they rely on the fact
+// that their arguments don't get rewritten to a non-extended opcode instead.
+
+// Boolean-generating instructions (NOTE: NOT all boolean Values) always
+// zero upper bit of the register; no need to zero-extend
+(MOVBUreg x:((Equal|NotEqual|LessThan|LessThanU|LessThanF|LessEqual|LessEqualU|LessEqualF|GreaterThan|GreaterThanU|GreaterThanF|GreaterEqual|GreaterEqualU|GreaterEqualF) _)) => x
+
+// omit unsigned extension
+(MOVWUreg x) && zeroUpper32Bits(x, 3) => x
+
+// don't extend after proper load
+(MOVBreg  x:(MOVBload  _ _)) => (MOVDreg x)
+(MOVBUreg x:(MOVBUload _ _)) => (MOVDreg x)
+(MOVHreg  x:(MOVBload  _ _)) => (MOVDreg x)
+(MOVHreg  x:(MOVBUload _ _)) => (MOVDreg x)
+(MOVHreg  x:(MOVHload  _ _)) => (MOVDreg x)
+(MOVHUreg x:(MOVBUload _ _)) => (MOVDreg x)
+(MOVHUreg x:(MOVHUload _ _)) => (MOVDreg x)
+(MOVWreg  x:(MOVBload  _ _)) => (MOVDreg x)
+(MOVWreg  x:(MOVBUload _ _)) => (MOVDreg x)
+(MOVWreg  x:(MOVHload  _ _)) => (MOVDreg x)
+(MOVWreg  x:(MOVHUload _ _)) => (MOVDreg x)
+(MOVWreg  x:(MOVWload  _ _)) => (MOVDreg x)
+(MOVWUreg x:(MOVBUload _ _)) => (MOVDreg x)
+(MOVWUreg x:(MOVHUload _ _)) => (MOVDreg x)
+(MOVWUreg x:(MOVWUload _ _)) => (MOVDreg x)
+(MOVBreg  x:(MOVBloadidx  _  _ _)) => (MOVDreg x)
+(MOVBUreg x:(MOVBUloadidx  _ _ _)) => (MOVDreg x)
+(MOVHreg  x:(MOVBloadidx   _ _ _)) => (MOVDreg x)
+(MOVHreg  x:(MOVBUloadidx  _ _ _)) => (MOVDreg x)
+(MOVHreg  x:(MOVHloadidx   _ _ _)) => (MOVDreg x)
+(MOVHUreg x:(MOVBUloadidx  _ _ _)) => (MOVDreg x)
+(MOVHUreg x:(MOVHUloadidx  _ _ _)) => (MOVDreg x)
+(MOVWreg  x:(MOVBloadidx   _ _ _)) => (MOVDreg x)
+(MOVWreg  x:(MOVBUloadidx  _ _ _)) => (MOVDreg x)
+(MOVWreg  x:(MOVHloadidx   _ _ _)) => (MOVDreg x)
+(MOVWreg  x:(MOVHUloadidx  _ _ _)) => (MOVDreg x)
+(MOVWreg  x:(MOVWloadidx   _ _ _)) => (MOVDreg x)
+(MOVWUreg x:(MOVBUloadidx  _ _ _)) => (MOVDreg x)
+(MOVWUreg x:(MOVHUloadidx  _ _ _)) => (MOVDreg x)
+(MOVWUreg x:(MOVWUloadidx  _ _ _)) => (MOVDreg x)
+(MOVHreg  x:(MOVHloadidx2  _ _ _)) => (MOVDreg x)
+(MOVHUreg x:(MOVHUloadidx2 _ _ _)) => (MOVDreg x)
+(MOVWreg  x:(MOVHloadidx2  _ _ _)) => (MOVDreg x)
+(MOVWreg  x:(MOVHUloadidx2 _ _ _)) => (MOVDreg x)
+(MOVWreg  x:(MOVWloadidx4  _ _ _)) => (MOVDreg x)
+(MOVWUreg x:(MOVHUloadidx2 _ _ _)) => (MOVDreg x)
+(MOVWUreg x:(MOVWUloadidx4 _ _ _)) => (MOVDreg x)
+
+// fold double extensions
+(MOVBreg  x:(MOVBreg  _)) => (MOVDreg x)
+(MOVBUreg x:(MOVBUreg _)) => (MOVDreg x)
+(MOVHreg  x:(MOVBreg  _)) => (MOVDreg x)
+(MOVHreg  x:(MOVBUreg _)) => (MOVDreg x)
+(MOVHreg  x:(MOVHreg  _)) => (MOVDreg x)
+(MOVHUreg x:(MOVBUreg _)) => (MOVDreg x)
+(MOVHUreg x:(MOVHUreg _)) => (MOVDreg x)
+(MOVWreg  x:(MOVBreg  _)) => (MOVDreg x)
+(MOVWreg  x:(MOVBUreg _)) => (MOVDreg x)
+(MOVWreg  x:(MOVHreg  _)) => (MOVDreg x)
+(MOVWreg  x:(MOVWreg  _)) => (MOVDreg x)
+(MOVWUreg x:(MOVBUreg _)) => (MOVDreg x)
+(MOVWUreg x:(MOVHUreg _)) => (MOVDreg x)
+(MOVWUreg x:(MOVWUreg _)) => (MOVDreg x)

src/cmd/compile/internal/ssa/copyelim.go

@@ -11,6 +11,17 @@ func copyelim(f *Func) {
 	// of OpCopy) is a copy.
 	for _, b := range f.Blocks {
 		for _, v := range b.Values {
+
+			// This is an early place in SSA where all values are examined.
+			// Rewrite all 0-sized Go values to remove accessors, dereferences, loads, etc.
+			if t := v.Type; (t.IsStruct() || t.IsArray()) && t.Size() == 0 {
+				if t.IsStruct() {
+					v.reset(OpStructMake0)
+				} else {
+					v.reset(OpArrayMake0)
+				}
+			}
+
 			copyelimValue(v)
 		}
 	}

src/cmd/compile/internal/ssa/rewrite.go

@@ -1279,6 +1279,11 @@ func areAdjacentOffsets(off1, off2, size int64) bool {
 // depth limits recursion depth. In AMD64.rules 3 is used as limit,
 // because it catches same amount of cases as 4.
 func zeroUpper32Bits(x *Value, depth int) bool {
+	if x.Type.IsSigned() && x.Type.Size() < 8 {
+		// If the value is signed, it might get re-sign-extended
+		// during spill and restore. See issue 68227.
+		return false
+	}
 	switch x.Op {
 	case OpAMD64MOVLconst, OpAMD64MOVLload, OpAMD64MOVLQZX, OpAMD64MOVLloadidx1,
 		OpAMD64MOVWload, OpAMD64MOVWloadidx1, OpAMD64MOVBload, OpAMD64MOVBloadidx1,
@@ -1294,8 +1299,10 @@ func zeroUpper32Bits(x *Value, depth int) bool {
 		OpARM64MULW, OpARM64MNEGW, OpARM64UDIVW, OpARM64DIVW, OpARM64UMODW,
 		OpARM64MADDW, OpARM64MSUBW, OpARM64RORW, OpARM64RORWconst:
 		return true
-	case OpArg:
-		return x.Type.Size() == 4
+	case OpArg: // note: but not ArgIntReg
+		// amd64 always loads args from the stack unsigned.
+		// most other architectures load them sign/zero extended based on the type.
+		return x.Type.Size() == 4 && x.Block.Func.Config.arch == "amd64"
 	case OpPhi, OpSelect0, OpSelect1:
 		// Phis can use each-other as an arguments, instead of tracking visited values,
 		// just limit recursion depth.
@@ -1315,11 +1322,14 @@ func zeroUpper32Bits(x *Value, depth int) bool {
 
 // zeroUpper48Bits is similar to zeroUpper32Bits, but for upper 48 bits.
 func zeroUpper48Bits(x *Value, depth int) bool {
+	if x.Type.IsSigned() && x.Type.Size() < 8 {
+		return false
+	}
 	switch x.Op {
 	case OpAMD64MOVWQZX, OpAMD64MOVWload, OpAMD64MOVWloadidx1, OpAMD64MOVWloadidx2:
 		return true
-	case OpArg:
-		return x.Type.Size() == 2
+	case OpArg: // note: but not ArgIntReg
+		return x.Type.Size() == 2 && x.Block.Func.Config.arch == "amd64"
 	case OpPhi, OpSelect0, OpSelect1:
 		// Phis can use each-other as an arguments, instead of tracking visited values,
 		// just limit recursion depth.
@@ -1339,11 +1349,14 @@ func zeroUpper48Bits(x *Value, depth int) bool {
 
 // zeroUpper56Bits is similar to zeroUpper32Bits, but for upper 56 bits.
 func zeroUpper56Bits(x *Value, depth int) bool {
+	if x.Type.IsSigned() && x.Type.Size() < 8 {
+		return false
+	}
 	switch x.Op {
 	case OpAMD64MOVBQZX, OpAMD64MOVBload, OpAMD64MOVBloadidx1:
 		return true
-	case OpArg:
-		return x.Type.Size() == 1
+	case OpArg: // note: but not ArgIntReg
+		return x.Type.Size() == 1 && x.Block.Func.Config.arch == "amd64"
 	case OpPhi, OpSelect0, OpSelect1:
 		// Phis can use each-other as an arguments, instead of tracking visited values,
 		// just limit recursion depth.
@@ -2131,8 +2144,8 @@ func logicFlags32(x int32) flagConstant {
 
 func makeJumpTableSym(b *Block) *obj.LSym {
 	s := base.Ctxt.Lookup(fmt.Sprintf("%s.jump%d", b.Func.fe.Func().LSym.Name, b.ID))
-	s.Set(obj.AttrDuplicateOK, true)
-	s.Set(obj.AttrLocal, true)
+	// The jump table symbol is accessed only from the function symbol.
+	s.Set(obj.AttrStatic, true)
 	return s
 }
 

src/cmd/compile/internal/ssa/rewriteAMD64.go

@@ -9640,17 +9640,6 @@ func rewriteValueAMD64_OpAMD64MOVBQZX(v *Value) bool {
 		v0.AddArg2(ptr, mem)
 		return true
 	}
-	// match: (MOVBQZX x)
-	// cond: zeroUpper56Bits(x,3)
-	// result: x
-	for {
-		x := v_0
-		if !(zeroUpper56Bits(x, 3)) {
-			break
-		}
-		v.copyOf(x)
-		return true
-	}
 	// match: (MOVBQZX (ANDLconst [c] x))
 	// result: (ANDLconst [c & 0xff] x)
 	for {
@@ -10392,17 +10381,6 @@ func rewriteValueAMD64_OpAMD64MOVLQZX(v *Value) bool {
 		v0.AddArg2(ptr, mem)
 		return true
 	}
-	// match: (MOVLQZX x)
-	// cond: zeroUpper32Bits(x,3)
-	// result: x
-	for {
-		x := v_0
-		if !(zeroUpper32Bits(x, 3)) {
-			break
-		}
-		v.copyOf(x)
-		return true
-	}
 	// match: (MOVLQZX (ANDLconst [c] x))
 	// result: (ANDLconst [c] x)
 	for {
@@ -12756,17 +12734,6 @@ func rewriteValueAMD64_OpAMD64MOVWQZX(v *Value) bool {
 		v0.AddArg2(ptr, mem)
 		return true
 	}
-	// match: (MOVWQZX x)
-	// cond: zeroUpper48Bits(x,3)
-	// result: x
-	for {
-		x := v_0
-		if !(zeroUpper48Bits(x, 3)) {
-			break
-		}
-		v.copyOf(x)
-		return true
-	}
 	// match: (MOVWQZX (ANDLconst [c] x))
 	// result: (ANDLconst [c & 0xffff] x)
 	for {

src/cmd/compile/internal/ssa/rewriteAMD64latelower.go

@@ -6,6 +6,12 @@ import "internal/buildcfg"
 
 func rewriteValueAMD64latelower(v *Value) bool {
 	switch v.Op {
+	case OpAMD64MOVBQZX:
+		return rewriteValueAMD64latelower_OpAMD64MOVBQZX(v)
+	case OpAMD64MOVLQZX:
+		return rewriteValueAMD64latelower_OpAMD64MOVLQZX(v)
+	case OpAMD64MOVWQZX:
+		return rewriteValueAMD64latelower_OpAMD64MOVWQZX(v)
 	case OpAMD64SARL:
 		return rewriteValueAMD64latelower_OpAMD64SARL(v)
 	case OpAMD64SARQ:
@@ -21,6 +27,51 @@ func rewriteValueAMD64latelower(v *Value) bool {
 	}
 	return false
 }
+func rewriteValueAMD64latelower_OpAMD64MOVBQZX(v *Value) bool {
+	v_0 := v.Args[0]
+	// match: (MOVBQZX x)
+	// cond: zeroUpper56Bits(x,3)
+	// result: x
+	for {
+		x := v_0
+		if !(zeroUpper56Bits(x, 3)) {
+			break
+		}
+		v.copyOf(x)
+		return true
+	}
+	return false
+}
+func rewriteValueAMD64latelower_OpAMD64MOVLQZX(v *Value) bool {
+	v_0 := v.Args[0]
+	// match: (MOVLQZX x)
+	// cond: zeroUpper32Bits(x,3)
+	// result: x
+	for {
+		x := v_0
+		if !(zeroUpper32Bits(x, 3)) {
+			break
+		}
+		v.copyOf(x)
+		return true
+	}
+	return false
+}
+func rewriteValueAMD64latelower_OpAMD64MOVWQZX(v *Value) bool {
+	v_0 := v.Args[0]
+	// match: (MOVWQZX x)
+	// cond: zeroUpper48Bits(x,3)
+	// result: x
+	for {
+		x := v_0
+		if !(zeroUpper48Bits(x, 3)) {
+			break
+		}
+		v.copyOf(x)
+		return true
+	}
+	return false
+}
 func rewriteValueAMD64latelower_OpAMD64SARL(v *Value) bool {
 	v_1 := v.Args[1]
 	v_0 := v.Args[0]

src/cmd/compile/internal/ssa/rewriteARM64.go

@@ -8307,39 +8307,6 @@ func rewriteValueARM64_OpARM64MOVBUloadidx(v *Value) bool {
 }
 func rewriteValueARM64_OpARM64MOVBUreg(v *Value) bool {
 	v_0 := v.Args[0]
-	// match: (MOVBUreg x:(MOVBUload _ _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVBUload {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVBUreg x:(MOVBUloadidx _ _ _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVBUloadidx {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVBUreg x:(MOVBUreg _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVBUreg {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
 	// match: (MOVBUreg (ANDconst [c] x))
 	// result: (ANDconst [c&(1<<8-1)] x)
 	for {
@@ -8364,160 +8331,6 @@ func rewriteValueARM64_OpARM64MOVBUreg(v *Value) bool {
 		v.AuxInt = int64ToAuxInt(int64(uint8(c)))
 		return true
 	}
-	// match: (MOVBUreg x:(Equal _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64Equal {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVBUreg x:(NotEqual _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64NotEqual {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVBUreg x:(LessThan _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64LessThan {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVBUreg x:(LessThanU _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64LessThanU {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVBUreg x:(LessThanF _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64LessThanF {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVBUreg x:(LessEqual _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64LessEqual {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVBUreg x:(LessEqualU _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64LessEqualU {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVBUreg x:(LessEqualF _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64LessEqualF {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVBUreg x:(GreaterThan _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64GreaterThan {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVBUreg x:(GreaterThanU _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64GreaterThanU {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVBUreg x:(GreaterThanF _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64GreaterThanF {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVBUreg x:(GreaterEqual _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64GreaterEqual {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVBUreg x:(GreaterEqualU _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64GreaterEqualU {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVBUreg x:(GreaterEqualF _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64GreaterEqualF {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
 	// match: (MOVBUreg x)
 	// cond: v.Type.Size() <= 1
 	// result: x
@@ -8748,39 +8561,6 @@ func rewriteValueARM64_OpARM64MOVBloadidx(v *Value) bool {
 }
 func rewriteValueARM64_OpARM64MOVBreg(v *Value) bool {
 	v_0 := v.Args[0]
-	// match: (MOVBreg x:(MOVBload _ _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVBload {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVBreg x:(MOVBloadidx _ _ _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVBloadidx {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVBreg x:(MOVBreg _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVBreg {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
 	// match: (MOVBreg (MOVDconst [c]))
 	// result: (MOVDconst [int64(int8(c))])
 	for {
@@ -10353,83 +10133,6 @@ func rewriteValueARM64_OpARM64MOVHUloadidx2(v *Value) bool {
 }
 func rewriteValueARM64_OpARM64MOVHUreg(v *Value) bool {
 	v_0 := v.Args[0]
-	// match: (MOVHUreg x:(MOVBUload _ _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVBUload {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVHUreg x:(MOVHUload _ _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVHUload {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVHUreg x:(MOVBUloadidx _ _ _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVBUloadidx {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVHUreg x:(MOVHUloadidx _ _ _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVHUloadidx {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVHUreg x:(MOVHUloadidx2 _ _ _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVHUloadidx2 {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVHUreg x:(MOVBUreg _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVBUreg {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVHUreg x:(MOVHUreg _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVHUreg {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
 	// match: (MOVHUreg (ANDconst [c] x))
 	// result: (ANDconst [c&(1<<16-1)] x)
 	for {
@@ -10790,116 +10493,6 @@ func rewriteValueARM64_OpARM64MOVHloadidx2(v *Value) bool {
 }
 func rewriteValueARM64_OpARM64MOVHreg(v *Value) bool {
 	v_0 := v.Args[0]
-	// match: (MOVHreg x:(MOVBload _ _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVBload {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVHreg x:(MOVBUload _ _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVBUload {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVHreg x:(MOVHload _ _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVHload {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVHreg x:(MOVBloadidx _ _ _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVBloadidx {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVHreg x:(MOVBUloadidx _ _ _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVBUloadidx {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVHreg x:(MOVHloadidx _ _ _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVHloadidx {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVHreg x:(MOVHloadidx2 _ _ _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVHloadidx2 {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVHreg x:(MOVBreg _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVBreg {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVHreg x:(MOVBUreg _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVBUreg {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVHreg x:(MOVHreg _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVHreg {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
 	// match: (MOVHreg (MOVDconst [c]))
 	// result: (MOVDconst [int64(int16(c))])
 	for {
@@ -11955,127 +11548,6 @@ func rewriteValueARM64_OpARM64MOVWUloadidx4(v *Value) bool {
 }
 func rewriteValueARM64_OpARM64MOVWUreg(v *Value) bool {
 	v_0 := v.Args[0]
-	// match: (MOVWUreg x:(MOVBUload _ _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVBUload {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVWUreg x:(MOVHUload _ _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVHUload {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVWUreg x:(MOVWUload _ _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVWUload {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVWUreg x:(MOVBUloadidx _ _ _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVBUloadidx {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVWUreg x:(MOVHUloadidx _ _ _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVHUloadidx {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVWUreg x:(MOVWUloadidx _ _ _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVWUloadidx {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVWUreg x:(MOVHUloadidx2 _ _ _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVHUloadidx2 {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVWUreg x:(MOVWUloadidx4 _ _ _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVWUloadidx4 {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVWUreg x:(MOVBUreg _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVBUreg {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVWUreg x:(MOVHUreg _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVHUreg {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVWUreg x:(MOVWUreg _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVWUreg {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
 	// match: (MOVWUreg (ANDconst [c] x))
 	// result: (ANDconst [c&(1<<32-1)] x)
 	for {
@@ -12111,17 +11583,6 @@ func rewriteValueARM64_OpARM64MOVWUreg(v *Value) bool {
 		v.copyOf(x)
 		return true
 	}
-	// match: (MOVWUreg x)
-	// cond: zeroUpper32Bits(x, 3)
-	// result: x
-	for {
-		x := v_0
-		if !(zeroUpper32Bits(x, 3)) {
-			break
-		}
-		v.copyOf(x)
-		return true
-	}
 	// match: (MOVWUreg (SLLconst [lc] x))
 	// cond: lc >= 32
 	// result: (MOVDconst [0])
@@ -12428,193 +11889,6 @@ func rewriteValueARM64_OpARM64MOVWloadidx4(v *Value) bool {
 }
 func rewriteValueARM64_OpARM64MOVWreg(v *Value) bool {
 	v_0 := v.Args[0]
-	// match: (MOVWreg x:(MOVBload _ _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVBload {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVWreg x:(MOVBUload _ _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVBUload {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVWreg x:(MOVHload _ _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVHload {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVWreg x:(MOVHUload _ _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVHUload {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVWreg x:(MOVWload _ _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVWload {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVWreg x:(MOVBloadidx _ _ _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVBloadidx {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVWreg x:(MOVBUloadidx _ _ _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVBUloadidx {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVWreg x:(MOVHloadidx _ _ _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVHloadidx {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVWreg x:(MOVHUloadidx _ _ _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVHUloadidx {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVWreg x:(MOVWloadidx _ _ _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVWloadidx {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVWreg x:(MOVHloadidx2 _ _ _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVHloadidx2 {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVWreg x:(MOVHUloadidx2 _ _ _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVHUloadidx2 {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVWreg x:(MOVWloadidx4 _ _ _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVWloadidx4 {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVWreg x:(MOVBreg _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVBreg {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVWreg x:(MOVBUreg _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVBUreg {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVWreg x:(MOVHreg _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVHreg {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
-	// match: (MOVWreg x:(MOVWreg _))
-	// result: (MOVDreg x)
-	for {
-		x := v_0
-		if x.Op != OpARM64MOVWreg {
-			break
-		}
-		v.reset(OpARM64MOVDreg)
-		v.AddArg(x)
-		return true
-	}
 	// match: (MOVWreg (MOVDconst [c]))
 	// result: (MOVDconst [int64(int32(c))])
 	for {

src/cmd/compile/internal/ssa/rewriteARM64latelower.go

@@ -18,6 +18,18 @@ func rewriteValueARM64latelower(v *Value) bool {
 		return rewriteValueARM64latelower_OpARM64CMPWconst(v)
 	case OpARM64CMPconst:
 		return rewriteValueARM64latelower_OpARM64CMPconst(v)
+	case OpARM64MOVBUreg:
+		return rewriteValueARM64latelower_OpARM64MOVBUreg(v)
+	case OpARM64MOVBreg:
+		return rewriteValueARM64latelower_OpARM64MOVBreg(v)
+	case OpARM64MOVHUreg:
+		return rewriteValueARM64latelower_OpARM64MOVHUreg(v)
+	case OpARM64MOVHreg:
+		return rewriteValueARM64latelower_OpARM64MOVHreg(v)
+	case OpARM64MOVWUreg:
+		return rewriteValueARM64latelower_OpARM64MOVWUreg(v)
+	case OpARM64MOVWreg:
+		return rewriteValueARM64latelower_OpARM64MOVWreg(v)
 	case OpARM64ORconst:
 		return rewriteValueARM64latelower_OpARM64ORconst(v)
 	case OpARM64SUBconst:
@@ -178,6 +190,742 @@ func rewriteValueARM64latelower_OpARM64CMPconst(v *Value) bool {
 	}
 	return false
 }
+func rewriteValueARM64latelower_OpARM64MOVBUreg(v *Value) bool {
+	v_0 := v.Args[0]
+	// match: (MOVBUreg x:(Equal _))
+	// result: x
+	for {
+		x := v_0
+		if x.Op != OpARM64Equal {
+			break
+		}
+		v.copyOf(x)
+		return true
+	}
+	// match: (MOVBUreg x:(NotEqual _))
+	// result: x
+	for {
+		x := v_0
+		if x.Op != OpARM64NotEqual {
+			break
+		}
+		v.copyOf(x)
+		return true
+	}
+	// match: (MOVBUreg x:(LessThan _))
+	// result: x
+	for {
+		x := v_0
+		if x.Op != OpARM64LessThan {
+			break
+		}
+		v.copyOf(x)
+		return true
+	}
+	// match: (MOVBUreg x:(LessThanU _))
+	// result: x
+	for {
+		x := v_0
+		if x.Op != OpARM64LessThanU {
+			break
+		}
+		v.copyOf(x)
+		return true
+	}
+	// match: (MOVBUreg x:(LessThanF _))
+	// result: x
+	for {
+		x := v_0
+		if x.Op != OpARM64LessThanF {
+			break
+		}
+		v.copyOf(x)
+		return true
+	}
+	// match: (MOVBUreg x:(LessEqual _))
+	// result: x
+	for {
+		x := v_0
+		if x.Op != OpARM64LessEqual {
+			break
+		}
+		v.copyOf(x)
+		return true
+	}
+	// match: (MOVBUreg x:(LessEqualU _))
+	// result: x
+	for {
+		x := v_0
+		if x.Op != OpARM64LessEqualU {
+			break
+		}
+		v.copyOf(x)
+		return true
+	}
+	// match: (MOVBUreg x:(LessEqualF _))
+	// result: x
+	for {
+		x := v_0
+		if x.Op != OpARM64LessEqualF {
+			break
+		}
+		v.copyOf(x)
+		return true
+	}
+	// match: (MOVBUreg x:(GreaterThan _))
+	// result: x
+	for {
+		x := v_0
+		if x.Op != OpARM64GreaterThan {
+			break
+		}
+		v.copyOf(x)
+		return true
+	}
+	// match: (MOVBUreg x:(GreaterThanU _))
+	// result: x
+	for {
+		x := v_0
+		if x.Op != OpARM64GreaterThanU {
+			break
+		}
+		v.copyOf(x)
+		return true
+	}
+	// match: (MOVBUreg x:(GreaterThanF _))
+	// result: x
+	for {
+		x := v_0
+		if x.Op != OpARM64GreaterThanF {
+			break
+		}
+		v.copyOf(x)
+		return true
+	}
+	// match: (MOVBUreg x:(GreaterEqual _))
+	// result: x
+	for {
+		x := v_0
+		if x.Op != OpARM64GreaterEqual {
+			break
+		}
+		v.copyOf(x)
+		return true
+	}
+	// match: (MOVBUreg x:(GreaterEqualU _))
+	// result: x
+	for {
+		x := v_0
+		if x.Op != OpARM64GreaterEqualU {
+			break
+		}
+		v.copyOf(x)
+		return true
+	}
+	// match: (MOVBUreg x:(GreaterEqualF _))
+	// result: x
+	for {
+		x := v_0
+		if x.Op != OpARM64GreaterEqualF {
+			break
+		}
+		v.copyOf(x)
+		return true
+	}
+	// match: (MOVBUreg x:(MOVBUload _ _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVBUload {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVBUreg x:(MOVBUloadidx _ _ _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVBUloadidx {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVBUreg x:(MOVBUreg _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVBUreg {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	return false
+}
+func rewriteValueARM64latelower_OpARM64MOVBreg(v *Value) bool {
+	v_0 := v.Args[0]
+	// match: (MOVBreg x:(MOVBload _ _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVBload {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVBreg x:(MOVBloadidx _ _ _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVBloadidx {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVBreg x:(MOVBreg _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVBreg {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	return false
+}
+func rewriteValueARM64latelower_OpARM64MOVHUreg(v *Value) bool {
+	v_0 := v.Args[0]
+	// match: (MOVHUreg x:(MOVBUload _ _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVBUload {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVHUreg x:(MOVHUload _ _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVHUload {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVHUreg x:(MOVBUloadidx _ _ _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVBUloadidx {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVHUreg x:(MOVHUloadidx _ _ _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVHUloadidx {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVHUreg x:(MOVHUloadidx2 _ _ _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVHUloadidx2 {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVHUreg x:(MOVBUreg _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVBUreg {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVHUreg x:(MOVHUreg _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVHUreg {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	return false
+}
+func rewriteValueARM64latelower_OpARM64MOVHreg(v *Value) bool {
+	v_0 := v.Args[0]
+	// match: (MOVHreg x:(MOVBload _ _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVBload {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVHreg x:(MOVBUload _ _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVBUload {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVHreg x:(MOVHload _ _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVHload {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVHreg x:(MOVBloadidx _ _ _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVBloadidx {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVHreg x:(MOVBUloadidx _ _ _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVBUloadidx {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVHreg x:(MOVHloadidx _ _ _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVHloadidx {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVHreg x:(MOVHloadidx2 _ _ _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVHloadidx2 {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVHreg x:(MOVBreg _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVBreg {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVHreg x:(MOVBUreg _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVBUreg {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVHreg x:(MOVHreg _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVHreg {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	return false
+}
+func rewriteValueARM64latelower_OpARM64MOVWUreg(v *Value) bool {
+	v_0 := v.Args[0]
+	// match: (MOVWUreg x)
+	// cond: zeroUpper32Bits(x, 3)
+	// result: x
+	for {
+		x := v_0
+		if !(zeroUpper32Bits(x, 3)) {
+			break
+		}
+		v.copyOf(x)
+		return true
+	}
+	// match: (MOVWUreg x:(MOVBUload _ _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVBUload {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVWUreg x:(MOVHUload _ _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVHUload {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVWUreg x:(MOVWUload _ _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVWUload {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVWUreg x:(MOVBUloadidx _ _ _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVBUloadidx {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVWUreg x:(MOVHUloadidx _ _ _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVHUloadidx {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVWUreg x:(MOVWUloadidx _ _ _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVWUloadidx {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVWUreg x:(MOVHUloadidx2 _ _ _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVHUloadidx2 {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVWUreg x:(MOVWUloadidx4 _ _ _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVWUloadidx4 {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVWUreg x:(MOVBUreg _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVBUreg {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVWUreg x:(MOVHUreg _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVHUreg {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVWUreg x:(MOVWUreg _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVWUreg {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	return false
+}
+func rewriteValueARM64latelower_OpARM64MOVWreg(v *Value) bool {
+	v_0 := v.Args[0]
+	// match: (MOVWreg x:(MOVBload _ _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVBload {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVWreg x:(MOVBUload _ _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVBUload {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVWreg x:(MOVHload _ _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVHload {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVWreg x:(MOVHUload _ _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVHUload {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVWreg x:(MOVWload _ _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVWload {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVWreg x:(MOVBloadidx _ _ _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVBloadidx {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVWreg x:(MOVBUloadidx _ _ _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVBUloadidx {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVWreg x:(MOVHloadidx _ _ _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVHloadidx {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVWreg x:(MOVHUloadidx _ _ _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVHUloadidx {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVWreg x:(MOVWloadidx _ _ _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVWloadidx {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVWreg x:(MOVHloadidx2 _ _ _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVHloadidx2 {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVWreg x:(MOVHUloadidx2 _ _ _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVHUloadidx2 {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVWreg x:(MOVWloadidx4 _ _ _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVWloadidx4 {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVWreg x:(MOVBreg _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVBreg {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVWreg x:(MOVBUreg _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVBUreg {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVWreg x:(MOVHreg _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVHreg {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	// match: (MOVWreg x:(MOVWreg _))
+	// result: (MOVDreg x)
+	for {
+		x := v_0
+		if x.Op != OpARM64MOVWreg {
+			break
+		}
+		v.reset(OpARM64MOVDreg)
+		v.AddArg(x)
+		return true
+	}
+	return false
+}
 func rewriteValueARM64latelower_OpARM64ORconst(v *Value) bool {
 	v_0 := v.Args[0]
 	b := v.Block

src/cmd/compile/internal/ssa/writebarrier.go

@@ -252,6 +252,7 @@ func writebarrier(f *Func) {
 		var start, end int
 		var nonPtrStores int
 		values := b.Values
+		hasMove := false
 	FindSeq:
 		for i := len(values) - 1; i >= 0; i-- {
 			w := values[i]
@@ -263,6 +264,9 @@ func writebarrier(f *Func) {
 					end = i + 1
 				}
 				nonPtrStores = 0
+				if w.Op == OpMoveWB {
+					hasMove = true
+				}
 			case OpVarDef, OpVarLive:
 				continue
 			case OpStore:
@@ -273,6 +277,17 @@ func writebarrier(f *Func) {
 				if nonPtrStores > 2 {
 					break FindSeq
 				}
+				if hasMove {
+					// We need to ensure that this store happens
+					// before we issue a wbMove, as the wbMove might
+					// use the result of this store as its source.
+					// Even though this store is not write-barrier
+					// eligible, it might nevertheless be the store
+					// of a pointer to the stack, which is then the
+					// source of the move.
+					// See issue 71228.
+					break FindSeq
+				}
 			default:
 				if last == nil {
 					continue

src/cmd/compile/internal/test/pgo_devirtualize_test.go

@@ -14,8 +14,13 @@ import (
 	"testing"
 )
 
+type devirtualization struct {
+	pos    string
+	callee string
+}
+
 // testPGODevirtualize tests that specific PGO devirtualize rewrites are performed.
-func testPGODevirtualize(t *testing.T, dir string) {
+func testPGODevirtualize(t *testing.T, dir string, want []devirtualization) {
 	testenv.MustHaveGoRun(t)
 	t.Parallel()
 
@@ -23,7 +28,7 @@ func testPGODevirtualize(t *testing.T, dir string) {
 
 	// Add a go.mod so we have a consistent symbol names in this temp dir.
 	goMod := fmt.Sprintf(`module %s
-go 1.19
+go 1.21
 `, pkg)
 	if err := os.WriteFile(filepath.Join(dir, "go.mod"), []byte(goMod), 0644); err != nil {
 		t.Fatalf("error writing go.mod: %v", err)
@@ -60,51 +65,6 @@ go 1.19
 		t.Fatalf("error starting go test: %v", err)
 	}
 
-	type devirtualization struct {
-		pos    string
-		callee string
-	}
-
-	want := []devirtualization{
-		// ExerciseIface
-		{
-			pos:    "./devirt.go:101:20",
-			callee: "mult.Mult.Multiply",
-		},
-		{
-			pos:    "./devirt.go:101:39",
-			callee: "Add.Add",
-		},
-		// ExerciseFuncConcrete
-		{
-			pos:    "./devirt.go:173:36",
-			callee: "AddFn",
-		},
-		{
-			pos:    "./devirt.go:173:15",
-			callee: "mult.MultFn",
-		},
-		// ExerciseFuncField
-		{
-			pos:    "./devirt.go:207:35",
-			callee: "AddFn",
-		},
-		{
-			pos:    "./devirt.go:207:19",
-			callee: "mult.MultFn",
-		},
-		// ExerciseFuncClosure
-		// TODO(prattmic): Closure callees not implemented.
-		//{
-		//	pos:    "./devirt.go:249:27",
-		//	callee: "AddClosure.func1",
-		//},
-		//{
-		//	pos:    "./devirt.go:249:15",
-		//	callee: "mult.MultClosure.func1",
-		//},
-	}
-
 	got := make(map[devirtualization]struct{})
 
 	devirtualizedLine := regexp.MustCompile(`(.*): PGO devirtualizing \w+ call .* to (.*)`)
@@ -172,5 +132,130 @@ func TestPGODevirtualize(t *testing.T) {
 		}
 	}
 
-	testPGODevirtualize(t, dir)
+	want := []devirtualization{
+		// ExerciseIface
+		{
+			pos:    "./devirt.go:101:20",
+			callee: "mult.Mult.Multiply",
+		},
+		{
+			pos:    "./devirt.go:101:39",
+			callee: "Add.Add",
+		},
+		// ExerciseFuncConcrete
+		{
+			pos:    "./devirt.go:173:36",
+			callee: "AddFn",
+		},
+		{
+			pos:    "./devirt.go:173:15",
+			callee: "mult.MultFn",
+		},
+		// ExerciseFuncField
+		{
+			pos:    "./devirt.go:207:35",
+			callee: "AddFn",
+		},
+		{
+			pos:    "./devirt.go:207:19",
+			callee: "mult.MultFn",
+		},
+		// ExerciseFuncClosure
+		// TODO(prattmic): Closure callees not implemented.
+		//{
+		//	pos:    "./devirt.go:249:27",
+		//	callee: "AddClosure.func1",
+		//},
+		//{
+		//	pos:    "./devirt.go:249:15",
+		//	callee: "mult.MultClosure.func1",
+		//},
+	}
+
+	testPGODevirtualize(t, dir, want)
+}
+
+// Regression test for https://go.dev/issue/65615. If a target function changes
+// from non-generic to generic we can't devirtualize it (don't know the type
+// parameters), but the compiler should not crash.
+func TestLookupFuncGeneric(t *testing.T) {
+	wd, err := os.Getwd()
+	if err != nil {
+		t.Fatalf("error getting wd: %v", err)
+	}
+	srcDir := filepath.Join(wd, "testdata", "pgo", "devirtualize")
+
+	// Copy the module to a scratch location so we can add a go.mod.
+	dir := t.TempDir()
+	if err := os.Mkdir(filepath.Join(dir, "mult.pkg"), 0755); err != nil {
+		t.Fatalf("error creating dir: %v", err)
+	}
+	for _, file := range []string{"devirt.go", "devirt_test.go", "devirt.pprof", filepath.Join("mult.pkg", "mult.go")} {
+		if err := copyFile(filepath.Join(dir, file), filepath.Join(srcDir, file)); err != nil {
+			t.Fatalf("error copying %s: %v", file, err)
+		}
+	}
+
+	// Change MultFn from a concrete function to a parameterized function.
+	if err := convertMultToGeneric(filepath.Join(dir, "mult.pkg", "mult.go")); err != nil {
+		t.Fatalf("error editing mult.go: %v", err)
+	}
+
+	// Same as TestPGODevirtualize except for MultFn, which we cannot
+	// devirtualize to because it has become generic.
+	//
+	// Note that the important part of this test is that the build is
+	// successful, not the specific devirtualizations.
+	want := []devirtualization{
+		// ExerciseIface
+		{
+			pos:    "./devirt.go:101:20",
+			callee: "mult.Mult.Multiply",
+		},
+		{
+			pos:    "./devirt.go:101:39",
+			callee: "Add.Add",
+		},
+		// ExerciseFuncConcrete
+		{
+			pos:    "./devirt.go:173:36",
+			callee: "AddFn",
+		},
+		// ExerciseFuncField
+		{
+			pos:    "./devirt.go:207:35",
+			callee: "AddFn",
+		},
+		// ExerciseFuncClosure
+		// TODO(prattmic): Closure callees not implemented.
+		//{
+		//	pos:    "./devirt.go:249:27",
+		//	callee: "AddClosure.func1",
+		//},
+		//{
+		//	pos:    "./devirt.go:249:15",
+		//	callee: "mult.MultClosure.func1",
+		//},
+	}
+
+	testPGODevirtualize(t, dir, want)
+}
+
+var multFnRe = regexp.MustCompile(`func MultFn\(a, b int64\) int64`)
+
+func convertMultToGeneric(path string) error {
+	content, err := os.ReadFile(path)
+	if err != nil {
+		return fmt.Errorf("error opening: %w", err)
+	}
+
+	if !multFnRe.Match(content) {
+		return fmt.Errorf("MultFn not found; update regexp?")
+	}
+
+	// Users of MultFn shouldn't need adjustment, type inference should
+	// work OK.
+	content = multFnRe.ReplaceAll(content, []byte(`func MultFn[T int32|int64](a, b T) T`))
+
+	return os.WriteFile(path, content, 0644)
 }

src/cmd/compile/internal/types/goversion.go

@@ -34,7 +34,7 @@ func AllowsGoVersion(major, minor int) bool {
 }
 
 // ParseLangFlag verifies that the -lang flag holds a valid value, and
-// exits if not. It initializes data used by langSupported.
+// exits if not. It initializes data used by AllowsGoVersion.
 func ParseLangFlag() {
 	if base.Flag.Lang == "" {
 		return
@@ -59,6 +59,10 @@ func ParseLangFlag() {
 
 // parseLang parses a -lang option into a langVer.
 func parseLang(s string) (lang, error) {
+	if s == "go1" { // cmd/go's new spelling of "go1.0" (#65528)
+		s = "go1.0"
+	}
+
 	matches := goVersionRE.FindStringSubmatch(s)
 	if matches == nil {
 		return lang{}, fmt.Errorf(`should be something like "go1.12"`)

src/cmd/compile/internal/types/type.go

@@ -657,6 +657,9 @@ func NewPtr(elem *Type) *Type {
 	if elem.HasShape() {
 		t.SetHasShape(true)
 	}
+	if elem.Noalg() {
+		t.SetNoalg(true)
+	}
 	return t
 }
 

src/cmd/compile/internal/types2/alias.go

@@ -21,11 +21,14 @@ type Alias struct {
 // NewAlias creates a new Alias type with the given type name and rhs.
 // rhs must not be nil.
 func NewAlias(obj *TypeName, rhs Type) *Alias {
-	return (*Checker)(nil).newAlias(obj, rhs)
+	alias := (*Checker)(nil).newAlias(obj, rhs)
+	// Ensure that alias.actual is set (#65455).
+	unalias(alias)
+	return alias
 }
 
 func (a *Alias) Obj() *TypeName   { return a.obj }
-func (a *Alias) Underlying() Type { return a.actual.Underlying() }
+func (a *Alias) Underlying() Type { return unalias(a).Underlying() }
 func (a *Alias) String() string   { return TypeString(a, nil) }
 
 // Type accessors
@@ -36,24 +39,26 @@ func (a *Alias) String() string   { return TypeString(a, nil) }
 // Consequently, the result is never an alias type.
 func Unalias(t Type) Type {
 	if a0, _ := t.(*Alias); a0 != nil {
-		if a0.actual != nil {
-			return a0.actual
-		}
-		for a := a0; ; {
-			t = a.fromRHS
-			a, _ = t.(*Alias)
-			if a == nil {
-				break
-			}
-		}
-		if t == nil {
-			panic(fmt.Sprintf("non-terminated alias %s", a0.obj.name))
-		}
-		a0.actual = t
+		return unalias(a0)
 	}
 	return t
 }
 
+func unalias(a0 *Alias) Type {
+	if a0.actual != nil {
+		return a0.actual
+	}
+	var t Type
+	for a := a0; a != nil; a, _ = t.(*Alias) {
+		t = a.fromRHS
+	}
+	if t == nil {
+		panic(fmt.Sprintf("non-terminated alias %s", a0.obj.name))
+	}
+	a0.actual = t
+	return t
+}
+
 // asNamed returns t as *Named if that is t's
 // actual type. It returns nil otherwise.
 func asNamed(t Type) *Named {

src/cmd/compile/internal/types2/api_test.go

@@ -2195,6 +2195,12 @@ func TestIssue61737(t *testing.T) {
 	iface.NumMethods() // unlike go/types, there is no Complete() method, so we complete implicitly
 }
 
+func TestNewAlias_Issue65455(t *testing.T) {
+	obj := NewTypeName(nopos, nil, "A", nil)
+	alias := NewAlias(obj, Typ[Int])
+	alias.Underlying() // must not panic
+}
+
 func TestIssue15305(t *testing.T) {
 	const src = "package p; func f() int16; var _ = f(undef)"
 	f := mustParse(src)

src/cmd/compile/internal/types2/initorder.go

@@ -310,6 +310,14 @@ func (a nodeQueue) Swap(i, j int) {
 
 func (a nodeQueue) Less(i, j int) bool {
 	x, y := a[i], a[j]
+
+	// Prioritize all constants before non-constants. See go.dev/issue/66575/.
+	_, xConst := x.obj.(*Const)
+	_, yConst := y.obj.(*Const)
+	if xConst != yConst {
+		return xConst
+	}
+
 	// nodes are prioritized by number of incoming dependencies (1st key)
 	// and source order (2nd key)
 	return x.ndeps < y.ndeps || x.ndeps == y.ndeps && x.obj.order() < y.obj.order()

src/cmd/compile/internal/types2/issues_test.go

@@ -1093,3 +1093,32 @@ func _() {
 	conf := Config{GoVersion: "go1.17"}
 	mustTypecheck(src, &conf, nil)
 }
+
+func TestIssue68334(t *testing.T) {
+	const src = `
+package p
+
+func f(x int) {
+	for i, j := range x {
+		_, _ = i, j
+	}
+	var a, b int
+	for a, b = range x {
+		_, _ = a, b
+	}
+}
+`
+
+	got := ""
+	conf := Config{
+		GoVersion: "go1.21",                                      // #68334 requires GoVersion <= 1.21
+		Error:     func(err error) { got += err.Error() + "\n" }, // #68334 requires Error != nil
+	}
+	typecheck(src, &conf, nil) // do not crash
+
+	want := "p:5:20: cannot range over x (variable of type int): requires go1.22 or later\n" +
+		"p:9:19: cannot range over x (variable of type int): requires go1.22 or later\n"
+	if got != want {
+		t.Errorf("got: %s want: %s", got, want)
+	}
+}

src/cmd/compile/internal/types2/stmt.go

@@ -902,7 +902,7 @@ func (check *Checker) rangeStmt(inner stmtContext, s *syntax.ForStmt, rclause *s
 	lhs := [2]Expr{sKey, sValue} // sKey, sValue may be nil
 	rhs := [2]Type{key, val}     // key, val may be nil
 
-	constIntRange := x.mode == constant_ && isInteger(x.typ)
+	rangeOverInt := isInteger(x.typ)
 
 	if isDef {
 		// short variable declaration
@@ -927,19 +927,28 @@ func (check *Checker) rangeStmt(inner stmtContext, s *syntax.ForStmt, rclause *s
 				check.errorf(lhs, InvalidSyntaxTree, "cannot declare %s", lhs)
 				obj = NewVar(lhs.Pos(), check.pkg, "_", nil) // dummy variable
 			}
+			assert(obj.typ == nil)
 
-			// initialize lhs variable
-			if constIntRange {
-				check.initVar(obj, &x, "range clause")
-			} else if typ := rhs[i]; typ != nil {
-				x.mode = value
-				x.expr = lhs // we don't have a better rhs expression to use here
-				x.typ = typ
-				check.initVar(obj, &x, "assignment") // error is on variable, use "assignment" not "range clause"
-			} else {
+			// initialize lhs iteration variable, if any
+			typ := rhs[i]
+			if typ == nil || typ == Typ[Invalid] {
+				// typ == Typ[Invalid] can happen if allowVersion fails.
 				obj.typ = Typ[Invalid]
 				obj.used = true // don't complain about unused variable
+				continue
 			}
+
+			if rangeOverInt {
+				assert(i == 0) // at most one iteration variable (rhs[1] == nil or Typ[Invalid] for rangeOverInt)
+				check.initVar(obj, &x, "range clause")
+			} else {
+				var y operand
+				y.mode = value
+				y.expr = lhs // we don't have a better rhs expression to use here
+				y.typ = typ
+				check.initVar(obj, &y, "assignment") // error is on variable, use "assignment" not "range clause"
+			}
+			assert(obj.typ != nil)
 		}
 
 		// declare variables
@@ -958,21 +967,36 @@ func (check *Checker) rangeStmt(inner stmtContext, s *syntax.ForStmt, rclause *s
 				continue
 			}
 
-			if constIntRange {
+			// assign to lhs iteration variable, if any
+			typ := rhs[i]
+			if typ == nil || typ == Typ[Invalid] {
+				continue
+			}
+
+			if rangeOverInt {
+				assert(i == 0) // at most one iteration variable (rhs[1] == nil or Typ[Invalid] for rangeOverInt)
 				check.assignVar(lhs, nil, &x, "range clause")
-			} else if typ := rhs[i]; typ != nil {
-				x.mode = value
-				x.expr = lhs // we don't have a better rhs expression to use here
-				x.typ = typ
-				check.assignVar(lhs, nil, &x, "assignment") // error is on variable, use "assignment" not "range clause"
+				// If the assignment succeeded, if x was untyped before, it now
+				// has a type inferred via the assignment. It must be an integer.
+				// (go.dev/issues/67027)
+				if x.mode != invalid && !isInteger(x.typ) {
+					check.softErrorf(lhs, InvalidRangeExpr, "cannot use iteration variable of type %s", x.typ)
+				}
+			} else {
+				var y operand
+				y.mode = value
+				y.expr = lhs // we don't have a better rhs expression to use here
+				y.typ = typ
+				check.assignVar(lhs, nil, &y, "assignment") // error is on variable, use "assignment" not "range clause"
 			}
 		}
-	} else if constIntRange {
+	} else if rangeOverInt {
 		// If we don't have any iteration variables, we still need to
 		// check that a (possibly untyped) integer range expression x
 		// is valid.
 		// We do this by checking the assignment _ = x. This ensures
-		// that an untyped x can be converted to a value of type int.
+		// that an untyped x can be converted to a value of its default
+		// type (rune or int).
 		check.assignment(&x, nil, "range clause")
 	}
 

src/cmd/compile/internal/types2/subst.go

@@ -95,6 +95,18 @@ func (subst *subster) typ(typ Type) Type {
 	case *Basic:
 		// nothing to do
 
+	case *Alias:
+		rhs := subst.typ(t.fromRHS)
+		if rhs != t.fromRHS {
+			// This branch cannot be reached because the RHS of an alias
+			// may only contain type parameters of an enclosing function.
+			// Such function bodies are never "instantiated" and thus
+			// substitution is not called on locally declared alias types.
+			// TODO(gri) adjust once parameterized aliases are supported
+			panic("unreachable for unparameterized aliases")
+			// return subst.check.newAlias(t.obj, rhs)
+		}
+
 	case *Array:
 		elem := subst.typOrNil(t.elem)
 		if elem != t.elem {

src/cmd/compile/internal/walk/assign.go

@@ -623,21 +623,23 @@ func isAppendOfMake(n ir.Node) bool {
 //	    panicmakeslicelen()
 //	  }
 //	  s := l1
-//	  n := len(s) + l2
-//	  // Compare n and s as uint so growslice can panic on overflow of len(s) + l2.
-//	  // cap is a positive int and n can become negative when len(s) + l2
-//	  // overflows int. Interpreting n when negative as uint makes it larger
-//	  // than cap(s). growslice will check the int n arg and panic if n is
-//	  // negative. This prevents the overflow from being undetected.
-//	  if uint(n) <= uint(cap(s)) {
-//	    s = s[:n]
-//	  } else {
-//	    s = growslice(T, s.ptr, n, s.cap, l2, T)
+//	  if l2 != 0 {
+//	    n := len(s) + l2
+//	    // Compare n and s as uint so growslice can panic on overflow of len(s) + l2.
+//	    // cap is a positive int and n can become negative when len(s) + l2
+//	    // overflows int. Interpreting n when negative as uint makes it larger
+//	    // than cap(s). growslice will check the int n arg and panic if n is
+//	    // negative. This prevents the overflow from being undetected.
+//	    if uint(n) <= uint(cap(s)) {
+//	      s = s[:n]
+//	    } else {
+//	      s = growslice(T, s.ptr, n, s.cap, l2, T)
+//	    }
+//	    // clear the new portion of the underlying array.
+//	    hp := &s[len(s)-l2]
+//	    hn := l2 * sizeof(T)
+//	    memclr(hp, hn)
 //	  }
-//	  // clear the new portion of the underlying array.
-//	  hp := &s[len(s)-l2]
-//	  hn := l2 * sizeof(T)
-//	  memclr(hp, hn)
 //	}
 //	s
 //
@@ -671,11 +673,18 @@ func extendSlice(n *ir.CallExpr, init *ir.Nodes) ir.Node {
 	s := typecheck.TempAt(base.Pos, ir.CurFunc, l1.Type())
 	nodes = append(nodes, ir.NewAssignStmt(base.Pos, s, l1))
 
+	// if l2 != 0 {
+	// Avoid work if we're not appending anything. But more importantly,
+	// avoid allowing hp to be a past-the-end pointer when clearing. See issue 67255.
+	nifnz := ir.NewIfStmt(base.Pos, ir.NewBinaryExpr(base.Pos, ir.ONE, l2, ir.NewInt(base.Pos, 0)), nil, nil)
+	nifnz.Likely = true
+	nodes = append(nodes, nifnz)
+
 	elemtype := s.Type().Elem()
 
 	// n := s.len + l2
 	nn := typecheck.TempAt(base.Pos, ir.CurFunc, types.Types[types.TINT])
-	nodes = append(nodes, ir.NewAssignStmt(base.Pos, nn, ir.NewBinaryExpr(base.Pos, ir.OADD, ir.NewUnaryExpr(base.Pos, ir.OLEN, s), l2)))
+	nifnz.Body = append(nifnz.Body, ir.NewAssignStmt(base.Pos, nn, ir.NewBinaryExpr(base.Pos, ir.OADD, ir.NewUnaryExpr(base.Pos, ir.OLEN, s), l2)))
 
 	// if uint(n) <= uint(s.cap)
 	nuint := typecheck.Conv(nn, types.Types[types.TUINT])
@@ -697,7 +706,7 @@ func extendSlice(n *ir.CallExpr, init *ir.Nodes) ir.Node {
 			l2)),
 	}
 
-	nodes = append(nodes, nif)
+	nifnz.Body = append(nifnz.Body, nif)
 
 	// hp := &s[s.len - l2]
 	// TODO: &s[s.len] - hn?
@@ -723,7 +732,7 @@ func extendSlice(n *ir.CallExpr, init *ir.Nodes) ir.Node {
 		// if growslice isn't called do we need to do the zeroing ourselves.
 		nif.Body = append(nif.Body, clr...)
 	} else {
-		nodes = append(nodes, clr...)
+		nifnz.Body = append(nifnz.Body, clr...)
 	}
 
 	typecheck.Stmts(nodes)

src/cmd/compile/internal/walk/order.go

@@ -643,7 +643,12 @@ func (o *orderState) stmt(n ir.Node) {
 			indexLHS.Index = o.cheapExpr(indexLHS.Index)
 
 			call := n.Y.(*ir.CallExpr)
-			indexRHS := call.Args[0].(*ir.IndexExpr)
+			arg0 := call.Args[0]
+			// ir.SameSafeExpr skips OCONVNOPs, so we must do the same here (#66096).
+			for arg0.Op() == ir.OCONVNOP {
+				arg0 = arg0.(*ir.ConvExpr).X
+			}
+			indexRHS := arg0.(*ir.IndexExpr)
 			indexRHS.X = indexLHS.X
 			indexRHS.Index = indexLHS.Index
 

src/cmd/fix/buildtag.go

@@ -6,6 +6,7 @@ package main
 
 import (
 	"go/ast"
+	"go/version"
 	"strings"
 )
 
@@ -13,7 +14,7 @@ func init() {
 	register(buildtagFix)
 }
 
-const buildtagGoVersionCutoff = 1_18
+const buildtagGoVersionCutoff = "go1.18"
 
 var buildtagFix = fix{
 	name: "buildtag",
@@ -23,7 +24,7 @@ var buildtagFix = fix{
 }
 
 func buildtag(f *ast.File) bool {
-	if goVersion < buildtagGoVersionCutoff {
+	if version.Compare(*goVersion, buildtagGoVersionCutoff) < 0 {
 		return false
 	}
 

src/cmd/fix/buildtag_test.go

@@ -11,7 +11,7 @@ func init() {
 var buildtagTests = []testCase{
 	{
 		Name:    "buildtag.oldGo",
-		Version: 1_10,
+		Version: "go1.10",
 		In: `//go:build yes
 // +build yes
 
@@ -20,7 +20,7 @@ package main
 	},
 	{
 		Name:    "buildtag.new",
-		Version: 1_99,
+		Version: "go1.99",
 		In: `//go:build yes
 // +build yes
 

src/cmd/fix/main.go

@@ -13,13 +13,13 @@ import (
 	"go/parser"
 	"go/scanner"
 	"go/token"
+	"go/version"
 	"internal/diff"
 	"io"
 	"io/fs"
 	"os"
 	"path/filepath"
 	"sort"
-	"strconv"
 	"strings"
 )
 
@@ -37,10 +37,8 @@ var forceRewrites = flag.String("force", "",
 var allowed, force map[string]bool
 
 var (
-	doDiff       = flag.Bool("diff", false, "display diffs instead of rewriting files")
-	goVersionStr = flag.String("go", "", "go language version for files")
-
-	goVersion int // 115 for go1.15
+	doDiff    = flag.Bool("diff", false, "display diffs instead of rewriting files")
+	goVersion = flag.String("go", "", "go language version for files")
 )
 
 // enable for debugging fix failures
@@ -68,24 +66,9 @@ func main() {
 	flag.Usage = usage
 	flag.Parse()
 
-	if *goVersionStr != "" {
-		if !strings.HasPrefix(*goVersionStr, "go") {
-			report(fmt.Errorf("invalid -go=%s", *goVersionStr))
-			os.Exit(exitCode)
-		}
-		majorStr := (*goVersionStr)[len("go"):]
-		minorStr := "0"
-		if before, after, found := strings.Cut(majorStr, "."); found {
-			majorStr, minorStr = before, after
-		}
-		major, err1 := strconv.Atoi(majorStr)
-		minor, err2 := strconv.Atoi(minorStr)
-		if err1 != nil || err2 != nil || major < 0 || major >= 100 || minor < 0 || minor >= 100 {
-			report(fmt.Errorf("invalid -go=%s", *goVersionStr))
-			os.Exit(exitCode)
-		}
-
-		goVersion = major*100 + minor
+	if !version.IsValid(*goVersion) {
+		report(fmt.Errorf("invalid -go=%s", *goVersion))
+		os.Exit(exitCode)
 	}
 
 	sort.Sort(byDate(fixes))

src/cmd/fix/main_test.go

@@ -17,7 +17,7 @@ import (
 type testCase struct {
 	Name    string
 	Fn      func(*ast.File) bool
-	Version int
+	Version string
 	In      string
 	Out     string
 }
@@ -96,7 +96,7 @@ func TestRewrite(t *testing.T) {
 	for _, tt := range testCases {
 		tt := tt
 		t.Run(tt.Name, func(t *testing.T) {
-			if tt.Version == 0 {
+			if tt.Version == "" {
 				if testing.Verbose() {
 					// Don't run in parallel: cmd/fix sometimes writes directly to stderr,
 					// and since -v prints which test is currently running we want that
@@ -105,10 +105,10 @@ func TestRewrite(t *testing.T) {
 					t.Parallel()
 				}
 			} else {
-				old := goVersion
-				goVersion = tt.Version
+				old := *goVersion
+				*goVersion = tt.Version
 				defer func() {
-					goVersion = old
+					*goVersion = old
 				}()
 			}
 

src/cmd/go/internal/generate/generate.go

@@ -181,6 +181,8 @@ func init() {
 }
 
 func runGenerate(ctx context.Context, cmd *base.Command, args []string) {
+	modload.InitWorkfile()
+
 	if generateRunFlag != "" {
 		var err error
 		generateRunRE, err = regexp.Compile(generateRunFlag)

src/cmd/go/internal/list/list.go

@@ -723,6 +723,9 @@ func runList(ctx context.Context, cmd *base.Command, args []string) {
 		b.IsCmdList = true
 		b.NeedExport = *listExport
 		b.NeedCompiledGoFiles = *listCompiled
+		if cfg.Experiment.CoverageRedesign && cfg.BuildCover {
+			load.PrepareForCoverageBuild(pkgs)
+		}
 		a := &work.Action{}
 		// TODO: Use pkgsFilter?
 		for _, p := range pkgs {
@@ -730,9 +733,6 @@ func runList(ctx context.Context, cmd *base.Command, args []string) {
 				a.Deps = append(a.Deps, b.AutoAction(work.ModeInstall, work.ModeInstall, p))
 			}
 		}
-		if cfg.Experiment.CoverageRedesign && cfg.BuildCover {
-			load.PrepareForCoverageBuild(pkgs)
-		}
 		b.Do(ctx, a)
 	}
 

src/cmd/go/internal/modcmd/verify.go

@@ -61,7 +61,7 @@ func runVerify(ctx context.Context, cmd *base.Command, args []string) {
 	if err != nil {
 		base.Fatal(err)
 	}
-	mods := mg.BuildList()[modload.MainModules.Len():]
+	mods := mg.BuildList()
 	// Use a slice of result channels, so that the output is deterministic.
 	errsChans := make([]<-chan []error, len(mods))
 
@@ -94,6 +94,9 @@ func verifyMod(ctx context.Context, mod module.Version) []error {
 		// "go" and "toolchain" have no disk footprint; nothing to verify.
 		return nil
 	}
+	if modload.MainModules.Contains(mod.Path) {
+		return nil
+	}
 	var errs []error
 	zip, zipErr := modfetch.CachePath(ctx, mod, "zip")
 	if zipErr == nil {

src/cmd/go/internal/modfetch/codehost/git.go

@@ -554,7 +554,7 @@ func (r *gitRepo) stat(ctx context.Context, rev string) (info *RevInfo, err erro
 		// an apparent Git bug introduced in Git 2.21 (commit 61c771),
 		// which causes the handler for protocol version 1 to sometimes miss
 		// tags that point to the requested commit (see https://go.dev/issue/56881).
-		_, err = Run(ctx, r.dir, "git", "fetch", "-f", "-c", "protocol.version=2", "--depth=1", r.remote, refspec)
+		_, err = Run(ctx, r.dir, "git", "-c", "protocol.version=2", "fetch", "-f", "--depth=1", r.remote, refspec)
 		release()
 
 		if err == nil {
@@ -662,7 +662,21 @@ func (r *gitRepo) statLocal(ctx context.Context, version, rev string) (*RevInfo,
 			}
 		}
 	}
-	sort.Strings(info.Tags)
+
+	// Git 2.47.1 does not send the tags during shallow clone anymore
+	// (perhaps the exact version that changed behavior is an earlier one),
+	// so we have to also add tags from the refs list we fetched with ls-remote.
+	if refs, err := r.loadRefs(ctx); err == nil {
+		for ref, h := range refs {
+			if h == hash {
+				if tag, found := strings.CutPrefix(ref, "refs/tags/"); found {
+					info.Tags = append(info.Tags, tag)
+				}
+			}
+		}
+	}
+	slices.Sort(info.Tags)
+	info.Tags = slices.Compact(info.Tags)
 
 	// Used hash as info.Version above.
 	// Use caller's suggested version if it appears in the tag list

src/cmd/go/internal/modload/modfile.go

@@ -190,7 +190,7 @@ func CheckRetractions(ctx context.Context, m module.Version) (err error) {
 		return err
 	}
 	summary, err := rawGoModSummary(rm)
-	if err != nil {
+	if err != nil && !errors.Is(err, gover.ErrTooNew) {
 		return err
 	}
 
@@ -298,7 +298,7 @@ func CheckDeprecation(ctx context.Context, m module.Version) (deprecation string
 		return "", err
 	}
 	summary, err := rawGoModSummary(latest)
-	if err != nil {
+	if err != nil && !errors.Is(err, gover.ErrTooNew) {
 		return "", err
 	}
 	return summary.deprecated, nil
@@ -644,6 +644,8 @@ func goModSummary(m module.Version) (*modFileSummary, error) {
 // its dependencies.
 //
 // rawGoModSummary cannot be used on the main module outside of workspace mode.
+// The modFileSummary can still be used for retractions and deprecations
+// even if a TooNewError is returned.
 func rawGoModSummary(m module.Version) (*modFileSummary, error) {
 	if gover.IsToolchain(m.Path) {
 		if m.Path == "go" && gover.Compare(m.Version, gover.GoStrictVersion) >= 0 {
@@ -698,12 +700,7 @@ func rawGoModSummary(m module.Version) (*modFileSummary, error) {
 				summary.require = append(summary.require, req.Mod)
 			}
 		}
-		if summary.goVersion != "" && gover.Compare(summary.goVersion, gover.GoStrictVersion) >= 0 {
-			if gover.Compare(summary.goVersion, gover.Local()) > 0 {
-				return nil, &gover.TooNewError{What: "module " + m.String(), GoVersion: summary.goVersion}
-			}
-			summary.require = append(summary.require, module.Version{Path: "go", Version: summary.goVersion})
-		}
+
 		if len(f.Retract) > 0 {
 			summary.retract = make([]retraction, 0, len(f.Retract))
 			for _, ret := range f.Retract {
@@ -714,6 +711,16 @@ func rawGoModSummary(m module.Version) (*modFileSummary, error) {
 			}
 		}
 
+		// This block must be kept at the end of the function because the summary may
+		// be used for reading retractions or deprecations even if a TooNewError is
+		// returned.
+		if summary.goVersion != "" && gover.Compare(summary.goVersion, gover.GoStrictVersion) >= 0 {
+			summary.require = append(summary.require, module.Version{Path: "go", Version: summary.goVersion})
+			if gover.Compare(summary.goVersion, gover.Local()) > 0 {
+				return summary, &gover.TooNewError{What: "module " + m.String(), GoVersion: summary.goVersion}
+			}
+		}
+
 		return summary, nil
 	})
 }

src/cmd/go/internal/test/test.go

@@ -1396,7 +1396,7 @@ func (r *runTestActor) Act(b *work.Builder, ctx context.Context, a *work.Action)
 
 	if p := a.Package; len(p.TestGoFiles)+len(p.XTestGoFiles) == 0 {
 		reportNoTestFiles := true
-		if cfg.BuildCover && cfg.Experiment.CoverageRedesign {
+		if cfg.BuildCover && cfg.Experiment.CoverageRedesign && p.Internal.Cover.GenMeta {
 			if err := sh.Mkdir(a.Objdir); err != nil {
 				return err
 			}

src/cmd/go/internal/toolchain/select.go

@@ -8,6 +8,7 @@ package toolchain
 import (
 	"context"
 	"errors"
+	"flag"
 	"fmt"
 	"go/build"
 	"io/fs"
@@ -24,6 +25,7 @@ import (
 	"cmd/go/internal/modfetch"
 	"cmd/go/internal/modload"
 	"cmd/go/internal/run"
+	"cmd/go/internal/work"
 
 	"golang.org/x/mod/module"
 )
@@ -182,6 +184,13 @@ func Select() {
 			}
 			if gover.Compare(goVers, minVers) > 0 {
 				gotoolchain = "go" + goVers
+				// Starting with Go 1.21, the first released version has a .0 patch version suffix.
+				// Don't try to download a language version (sans patch component), such as go1.22.
+				// Instead, use the first toolchain of that language version, such as 1.22.0.
+				// See golang.org/issue/62278.
+				if gover.IsLang(goVers) && gover.Compare(goVers, "1.21") >= 0 {
+					gotoolchain += ".0"
+				}
 				gover.Startup.AutoGoVersion = goVers
 				gover.Startup.AutoToolchain = "" // in case we are overriding it for being too old
 			}
@@ -310,6 +319,10 @@ func Exec(gotoolchain string) {
 	dir, err := modfetch.Download(context.Background(), m)
 	if err != nil {
 		if errors.Is(err, fs.ErrNotExist) {
+			toolVers := gover.FromToolchain(gotoolchain)
+			if gover.IsLang(toolVers) && gover.Compare(toolVers, "1.21") >= 0 {
+				base.Fatalf("invalid toolchain: %s is a language version but not a toolchain version (%s.x)", gotoolchain, gotoolchain)
+			}
 			base.Fatalf("download %s for %s/%s: toolchain not available", gotoolchain, runtime.GOOS, runtime.GOARCH)
 		}
 		base.Fatalf("download %s: %v", gotoolchain, err)
@@ -486,74 +499,132 @@ func goInstallVersion() bool {
 	// Note: We assume there are no flags between 'go' and 'install' or 'run'.
 	// During testing there are some debugging flags that are accepted
 	// in that position, but in production go binaries there are not.
-	if len(os.Args) < 3 || (os.Args[1] != "install" && os.Args[1] != "run") {
+	if len(os.Args) < 3 {
 		return false
 	}
 
-	// Check for pkg@version.
-	var arg string
+	var cmdFlags *flag.FlagSet
 	switch os.Args[1] {
 	default:
+		// Command doesn't support a pkg@version as the main module.
 		return false
 	case "install":
-		// We would like to let 'go install -newflag pkg@version' work even
-		// across a toolchain switch. To make that work, assume the pkg@version
-		// is the last argument and skip the flag parsing.
-		arg = os.Args[len(os.Args)-1]
+		cmdFlags = &work.CmdInstall.Flag
 	case "run":
-		// For run, the pkg@version can be anywhere on the command line,
-		// because it is preceded by run flags and followed by arguments to the
-		// program being run. To handle that precisely, we have to interpret the
-		// flags a little bit, to know whether each flag takes an optional argument.
-		// We can still allow unknown flags as long as they have an explicit =value.
-		args := os.Args[2:]
-		for i := 0; i < len(args); i++ {
-			a := args[i]
-			if !strings.HasPrefix(a, "-") {
-				arg = a
-				break
-			}
-			if a == "-" {
-				// non-flag but also non-pkg@version
+		cmdFlags = &run.CmdRun.Flag
+	}
+
+	// The modcachrw flag is unique, in that it affects how we fetch the
+	// requested module to even figure out what toolchain it needs.
+	// We need to actually set it before we check the toolchain version.
+	// (See https://go.dev/issue/64282.)
+	modcacherwFlag := cmdFlags.Lookup("modcacherw")
+	if modcacherwFlag == nil {
+		base.Fatalf("internal error: modcacherw flag not registered for command")
+	}
+	modcacherwVal, ok := modcacherwFlag.Value.(interface {
+		IsBoolFlag() bool
+		flag.Value
+	})
+	if !ok || !modcacherwVal.IsBoolFlag() {
+		base.Fatalf("internal error: modcacherw is not a boolean flag")
+	}
+
+	// Make a best effort to parse the command's args to find the pkg@version
+	// argument and the -modcacherw flag.
+	var (
+		pkgArg         string
+		modcacherwSeen bool
+	)
+	for args := os.Args[2:]; len(args) > 0; {
+		a := args[0]
+		args = args[1:]
+		if a == "--" {
+			if len(args) == 0 {
 				return false
 			}
-			if a == "--" {
-				if i+1 >= len(args) {
-					return false
+			pkgArg = args[0]
+			break
+		}
+
+		a, ok := strings.CutPrefix(a, "-")
+		if !ok {
+			// Not a flag argument. Must be a package.
+			pkgArg = a
+			break
+		}
+		a = strings.TrimPrefix(a, "-") // Treat --flag as -flag.
+
+		name, val, hasEq := strings.Cut(a, "=")
+
+		if name == "modcacherw" {
+			if !hasEq {
+				val = "true"
+			}
+			if err := modcacherwVal.Set(val); err != nil {
+				return false
+			}
+			modcacherwSeen = true
+			continue
+		}
+
+		if hasEq {
+			// Already has a value; don't bother parsing it.
+			continue
+		}
+
+		f := run.CmdRun.Flag.Lookup(a)
+		if f == nil {
+			// We don't know whether this flag is a boolean.
+			if os.Args[1] == "run" {
+				// We don't know where to find the pkg@version argument.
+				// For run, the pkg@version can be anywhere on the command line,
+				// because it is preceded by run flags and followed by arguments to the
+				// program being run. Since we don't know whether this flag takes
+				// an argument, we can't reliably identify the end of the run flags.
+				// Just give up and let the user clarify using the "=" form..
+				return false
+			}
+
+			// We would like to let 'go install -newflag pkg@version' work even
+			// across a toolchain switch. To make that work, assume by default that
+			// the pkg@version is the last argument and skip the remaining args unless
+			// we spot a plausible "-modcacherw" flag.
+			for len(args) > 0 {
+				a := args[0]
+				name, _, _ := strings.Cut(a, "=")
+				if name == "-modcacherw" || name == "--modcacherw" {
+					break
 				}
-				arg = args[i+1]
-				break
+				if len(args) == 1 && !strings.HasPrefix(a, "-") {
+					pkgArg = a
+				}
+				args = args[1:]
 			}
-			a = strings.TrimPrefix(a, "-")
-			a = strings.TrimPrefix(a, "-")
-			if strings.HasPrefix(a, "-") {
-				// non-flag but also non-pkg@version
-				return false
-			}
-			if strings.Contains(a, "=") {
-				// already has value
-				continue
-			}
-			f := run.CmdRun.Flag.Lookup(a)
-			if f == nil {
-				// Unknown flag. Give up. The command is going to fail in flag parsing.
-				return false
-			}
-			if bf, ok := f.Value.(interface{ IsBoolFlag() bool }); ok && bf.IsBoolFlag() {
-				// Does not take value.
-				continue
-			}
-			i++ // Does take a value; skip it.
+			continue
+		}
+
+		if bf, ok := f.Value.(interface{ IsBoolFlag() bool }); !ok || !bf.IsBoolFlag() {
+			// The next arg is the value for this flag. Skip it.
+			args = args[1:]
+			continue
 		}
 	}
-	if !strings.Contains(arg, "@") || build.IsLocalImport(arg) || filepath.IsAbs(arg) {
+
+	if !strings.Contains(pkgArg, "@") || build.IsLocalImport(pkgArg) || filepath.IsAbs(pkgArg) {
 		return false
 	}
-	path, version, _ := strings.Cut(arg, "@")
+	path, version, _ := strings.Cut(pkgArg, "@")
 	if path == "" || version == "" || gover.IsToolchain(path) {
 		return false
 	}
 
+	if !modcacherwSeen && base.InGOFLAGS("-modcacherw") {
+		fs := flag.NewFlagSet("goInstallVersion", flag.ExitOnError)
+		fs.Var(modcacherwVal, "modcacherw", modcacherwFlag.Usage)
+		base.SetFromGOFLAGS(fs)
+	}
+
 	// It would be correct to simply return true here, bypassing use
 	// of the current go.mod or go.work, and let "go run" or "go install"
 	// do the rest, including a toolchain switch.

src/cmd/go/internal/work/security.go

@@ -145,6 +145,12 @@ var validCompilerFlagsWithNextArg = []string{
 	"-x",
 }
 
+var invalidLinkerFlags = []*lazyregexp.Regexp{
+	// On macOS this means the linker loads and executes the next argument.
+	// Have to exclude separately because -lfoo is allowed in general.
+	re(`-lto_library`),
+}
+
 var validLinkerFlags = []*lazyregexp.Regexp{
 	re(`-F([^@\-].*)`),
 	re(`-l([^@\-].*)`),
@@ -235,12 +241,12 @@ var validLinkerFlagsWithNextArg = []string{
 
 func checkCompilerFlags(name, source string, list []string) error {
 	checkOverrides := true
-	return checkFlags(name, source, list, validCompilerFlags, validCompilerFlagsWithNextArg, checkOverrides)
+	return checkFlags(name, source, list, nil, validCompilerFlags, validCompilerFlagsWithNextArg, checkOverrides)
 }
 
 func checkLinkerFlags(name, source string, list []string) error {
 	checkOverrides := true
-	return checkFlags(name, source, list, validLinkerFlags, validLinkerFlagsWithNextArg, checkOverrides)
+	return checkFlags(name, source, list, invalidLinkerFlags, validLinkerFlags, validLinkerFlagsWithNextArg, checkOverrides)
 }
 
 // checkCompilerFlagsForInternalLink returns an error if 'list'
@@ -249,7 +255,7 @@ func checkLinkerFlags(name, source string, list []string) error {
 // external linker).
 func checkCompilerFlagsForInternalLink(name, source string, list []string) error {
 	checkOverrides := false
-	if err := checkFlags(name, source, list, validCompilerFlags, validCompilerFlagsWithNextArg, checkOverrides); err != nil {
+	if err := checkFlags(name, source, list, nil, validCompilerFlags, validCompilerFlagsWithNextArg, checkOverrides); err != nil {
 		return err
 	}
 	// Currently the only flag on the allow list that causes problems
@@ -262,7 +268,7 @@ func checkCompilerFlagsForInternalLink(name, source string, list []string) error
 	return nil
 }
 
-func checkFlags(name, source string, list []string, valid []*lazyregexp.Regexp, validNext []string, checkOverrides bool) error {
+func checkFlags(name, source string, list []string, invalid, valid []*lazyregexp.Regexp, validNext []string, checkOverrides bool) error {
 	// Let users override rules with $CGO_CFLAGS_ALLOW, $CGO_CFLAGS_DISALLOW, etc.
 	var (
 		allow    *regexp.Regexp
@@ -294,6 +300,11 @@ Args:
 		if allow != nil && allow.FindString(arg) == arg {
 			continue Args
 		}
+		for _, re := range invalid {
+			if re.FindString(arg) == arg { // must be complete match
+				goto Bad
+			}
+		}
 		for _, re := range valid {
 			if re.FindString(arg) == arg { // must be complete match
 				continue Args

src/cmd/go/testdata/mod/example.com_retract_newergoversion_v1.0.0.txt

@@ -0,0 +1,10 @@
+-- .mod --
+module example.com/retract/newergoversion
+
+go 1.21
+
+-- .info --
+{"Version":"v1.0.0"}
+
+-- retract.go --
+package newergoversion

src/cmd/go/testdata/mod/example.com_retract_newergoversion_v1.2.0.txt

@@ -0,0 +1,12 @@
+-- .mod --
+module example.com/retract/newergoversion
+
+go 1.23
+
+retract v1.2.0
+
+-- .info --
+{"Version":"v1.2.0"}
+
+-- retract.go --
+package newergoversion

src/cmd/go/testdata/script/build_issue48319.txt

@@ -4,6 +4,13 @@
 [short] skip
 [!cgo] skip
 
+# This test has problems when run on the LUCI darwin longtest builder,
+# which uses a more contemporary Xcode version that is unfriendly to
+# reproducible builds (see issue #64947 for the gory details). Note
+# that individual developers running "go test cmd/go" on Darwin may
+# still run into failures depending on their Xcode version.
+[GOOS:darwin] [go-builder] skip
+
 # This test is sensitive to cache invalidation,
 # so use a separate build cache that we can control.
 env GOCACHE=$WORK/gocache

src/cmd/go/testdata/script/build_issue_65528.txt

@@ -0,0 +1,9 @@
+go build
+
+-- go.mod --
+module test
+
+go 1.0
+
+-- p.go --
+package p

src/cmd/go/testdata/script/build_plugin_reproducible.txt

@@ -1,6 +1,13 @@
 [!buildmode:plugin] skip
 [short] skip
 
+# This test has problems when run on the LUCI darwin longtest builder,
+# which uses a more contemporary Xcode version that is unfriendly to
+# reproducible builds (see issue #64947 for the gory details). Note
+# that individual developers running "go test cmd/go" on Darwin may
+# still run into failures depending on their Xcode version.
+[GOOS:darwin] [go-builder] skip
+
 go build -trimpath -buildvcs=false -buildmode=plugin -o a.so main.go
 go build -trimpath -buildvcs=false -buildmode=plugin -o b.so main.go
 cmp -q a.so b.so

src/cmd/go/testdata/script/cover_coverpkg_partial.txt

@@ -39,6 +39,14 @@ go test -coverprofile=baz.p -coverpkg=./a,./d,./f ./b ./f
 stdout '^ok\s+M/b\s+\S+\s+coverage: 83.3% of statements in ./a, ./d, ./f'
 stdout '^\s*M/f\s+coverage: 0.0% of statements'
 
+# This sub-test inspired by issue 65653: if package P is is matched
+# via the package pattern supplied as the argument to "go test -cover"
+# but P is not part of "-coverpkg", then we don't want coverage for P
+# (including the specific case where P has no test files).
+go test -coverpkg=./a ./...
+stdout '^ok\s+M/a\s+\S+\s+coverage: 100.0% of statements in ./a'
+stdout '^\s*\?\s+M/f\s+\[no test files\]'
+
 -- a/a.go --
 package a
 

src/cmd/go/testdata/script/cover_list.txt

@@ -38,6 +38,10 @@ cp stdout $WORK/toolbuildid.txt
 # Build IDs should match here.
 cmp $WORK/toolbuildid.txt $WORK/listbuildid.txt
 
+# Make sure that the build succeeds regardless of covermode.
+go list -export -covermode=atomic m/example
+go list -export -covermode=count m/example
+
 -- go.mod --
 module m
 

src/cmd/go/testdata/script/darwin_lto_library_ldflag.txt

@@ -0,0 +1,17 @@
+[!GOOS:darwin] skip
+[!cgo] skip
+
+! go build
+stderr 'invalid flag in #cgo LDFLAGS: -lto_library'
+
+-- go.mod --
+module ldflag
+
+-- main.go --
+package main
+
+// #cgo CFLAGS: -flto
+// #cgo LDFLAGS: -lto_library bad.dylib
+import "C"
+
+func main() {}

src/cmd/go/testdata/script/generate_workspace.txt

@@ -0,0 +1,27 @@
+# This is a regression test for Issue #56098: Go generate
+# wasn't initializing workspace mode
+
+[short] skip
+
+go generate ./mod
+cmp ./mod/got.txt want.txt
+
+-- go.work --
+go 1.22
+
+use ./mod
+-- mod/go.mod --
+module example.com/mod
+-- mod/gen.go --
+//go:generate go run gen.go got.txt
+
+package main
+
+import "os"
+
+func main() {
+    outfile := os.Args[1]
+    os.WriteFile(outfile, []byte("Hello World!\n"), 0644)
+}
+-- want.txt --
+Hello World!

src/cmd/go/testdata/script/gotoolchain_issue66175.txt

@@ -0,0 +1,109 @@
+env TESTGO_VERSION=go1.14
+
+# Clear the path so this test doesn't fail if the system running it\
+# has a binary named go1.21 or go1.22 on its path.
+[GOOS:plan9] env path=
+[!GOOS:plan9] env PATH=
+
+# check for invalid toolchain in go.mod
+go mod init m
+go mod edit -go=1.14 -toolchain=go1.22
+! go version
+stderr 'go: invalid toolchain: go1.22 is a language version but not a toolchain version \(go1.22.x\)'
+
+rm go.mod
+go mod init m
+go mod edit -go=1.14 -toolchain=go1.21
+! go version
+stderr 'go: invalid toolchain: go1.21 is a language version but not a toolchain version \(go1.21.x\)'
+
+rm go.mod
+go mod init m
+go mod edit -go=1.14 -toolchain=go1.20
+! go version
+stderr 'go: downloading go1.20 '
+
+
+# check for invalid GOTOOLCHAIN
+env GOTOOLCHAIN=go1.14
+go version
+stdout 'go1.14'
+
+env GOTOOLCHAIN=go1.20
+! go version
+stderr 'go: downloading go1.20 '
+
+env GOTOOLCHAIN=go1.21
+! go version
+stderr 'go: invalid toolchain: go1.21 is a language version but not a toolchain version \(go1.21.x\)'
+
+env GOTOOLCHAIN=go1.22
+! go version
+stderr 'go: invalid toolchain: go1.22 is a language version but not a toolchain version \(go1.22.x\)'
+
+env GOTOOLCHAIN=go1.20+auto
+! go version
+stderr 'go: downloading go1.20 '
+
+env GOTOOLCHAIN=go1.21+auto
+! go version
+stderr 'go: invalid toolchain: go1.21 is a language version but not a toolchain version \(go1.21.x\)'
+
+env GOTOOLCHAIN=go1.22+auto
+! go version
+stderr 'go: invalid toolchain: go1.22 is a language version but not a toolchain version \(go1.22.x\)'
+
+env GOTOOLCHAIN=go1.21rc3
+! go version
+stderr 'go: downloading go1.21rc3 '
+
+env GOTOOLCHAIN=go1.22rc2
+! go version
+stderr 'go: downloading go1.22rc2 '
+
+env GOTOOLCHAIN=go1.66
+! go version
+stderr 'go: invalid toolchain: go1.66 is a language version but not a toolchain version \(go1.66.x\)'
+
+env GOTOOLCHAIN=go1.18beta2
+! go version
+stderr 'go: downloading go1.18beta2 '
+
+# go1.X is okay for path lookups
+env GOTOOLCHAIN=go1.20+path
+! go version
+stderr 'go: cannot find "go1.20" in PATH'
+
+env GOTOOLCHAIN=go1.21+path
+! go version
+stderr 'go: cannot find "go1.21" in PATH'
+
+env GOTOOLCHAIN=go1.22+path
+! go version
+stderr 'go: cannot find "go1.22" in PATH'
+
+# When a toolchain download takes place, download 1.X.0
+env GOTOOLCHAIN=auto
+rm go.mod
+go mod init m
+go mod edit -go=1.300 -toolchain=none
+! go version
+stderr 'go: downloading go1.300.0 '
+
+rm go.mod
+go mod init m
+go mod edit -go=1.21 -toolchain=none
+! go version
+stderr 'go: downloading go1.21.0 '
+
+rm go.mod
+go mod init m
+go mod edit -go=1.22 -toolchain=none
+! go version
+stderr 'go: downloading go1.22.0 '
+
+rm go.mod
+go mod init m
+go mod edit -go=1.15 -toolchain=none
+! go version
+stderr 'go: downloading go1.15 '

src/cmd/go/testdata/script/install_modcacherw_issue64282.txt

@@ -0,0 +1,45 @@
+# Regression test for https://go.dev/issue/64282.
+#
+# 'go install' and 'go run' with pkg@version arguments should make
+# a best effort to parse flags relevant to downloading modules
+# (currently only -modcacherw) before actually downloading the module
+# to identify which toolchain version to use.
+#
+# However, the best-effort flag parsing should not interfere with
+# actual flag parsing if we don't switch toolchains. In particular,
+# unrecognized flags should still be diagnosed after the module for
+# the requested package has been downloaded and checked for toolchain
+# upgrades.
+
+
+! go install -cake=delicious -modcacherw example.com/printversion@v0.1.0
+stderr '^flag provided but not defined: -cake$'
+	# Because the -modcacherw flag was set, we should be able to modify the contents
+	# of a directory within the module cache.
+cp $WORK/extraneous.txt $GOPATH/pkg/mod/example.com/printversion@v0.1.0/extraneous_file.go
+go clean -modcache
+
+
+! go install -unknownflag -tags -modcacherw example.com/printversion@v0.1.0
+stderr '^flag provided but not defined: -unknownflag$'
+cp $WORK/extraneous.txt $GOPATH/pkg/mod/example.com/printversion@v0.1.0/extraneous_file.go
+go clean -modcache
+
+
+# Also try it with a 'go install' that succeeds.
+# (But skip in short mode, because linking a binary is expensive.)
+[!short] go install -modcacherw example.com/printversion@v0.1.0
+[!short] cp $WORK/extraneous.txt $GOPATH/pkg/mod/example.com/printversion@v0.1.0/extraneous_file.go
+[!short] go clean -modcache
+
+
+# The flag should also be applied if given in GOFLAGS
+# instead of on the command line.
+env GOFLAGS=-modcacherw
+! go install -cake=delicious example.com/printversion@v0.1.0
+stderr '^flag provided but not defined: -cake$'
+cp $WORK/extraneous.txt $GOPATH/pkg/mod/example.com/printversion@v0.1.0/extraneous_file.go
+
+
+-- $WORK/extraneous.txt --
+This is not a Go source file.

src/cmd/go/testdata/script/list_retractions_issue66403.txt

@@ -0,0 +1,20 @@
+# For issue #66403, go list -u -m all should not fail if a module
+# with retractions has a newer version.
+
+env TESTGO_VERSION=go1.21
+env TESTGO_VERSION_SWITCH=switch
+go list -u -m example.com/retract/newergoversion
+stdout 'example.com/retract/newergoversion v1.0.0'
+! stdout 'v1.2.0'
+
+-- go.mod --
+module example.com/m
+
+go 1.22
+
+require example.com/retract/newergoversion v1.0.0
+
+-- main.go --
+package main
+
+import _ "example.com/retract/newergoversion"

src/cmd/go/testdata/script/mod_verify_work.txt

@@ -0,0 +1,24 @@
+# Regression test for Issue #62663: we would filter out the toolchain and
+# main modules from the build list incorrectly, leading to the workspace
+# modules being checked for correct sums. Specifically this would happen when
+# the module name sorted after the virtual 'go' version module name because
+# it could not get chopped off when we removed the MainModules.Len() modules
+# at the beginning of the build list and we would remove the go module instead.
+
+go mod verify
+
+-- go.work --
+go 1.21
+
+use (
+    ./a
+    ./b
+)
+-- a/go.mod --
+module hexample.com/a // important for test that module name sorts after 'go'
+
+go 1.21
+-- b/go.mod --
+module hexample.com/b // important for test that module name sorts after 'go'
+
+go 1.21

src/cmd/go/testdata/script/reuse_git.txt

@@ -7,7 +7,7 @@ env GOSUMDB=off
 
 # go mod download with the pseudo-version should invoke git but not have a TagSum or Ref.
 go mod download -x -json vcs-test.golang.org/git/hello.git@v0.0.0-20170922010558-fc3a09f3dc5c
-stderr 'git fetch'
+stderr 'git( .*)* fetch'
 cp stdout hellopseudo.json
 ! stdout '"(Query|TagPrefix|TagSum|Ref)"'
 stdout '"Version": "v0.0.0-20170922010558-fc3a09f3dc5c"'
@@ -18,7 +18,7 @@ go clean -modcache
 
 # go mod download vcstest/hello should invoke git, print origin info
 go mod download -x -json vcs-test.golang.org/git/hello.git@latest
-stderr 'git fetch'
+stderr 'git( .*)* fetch'
 cp stdout hello.json
 stdout '"Version": "v0.0.0-20170922010558-fc3a09f3dc5c"'
 stdout '"VCS": "git"'
@@ -33,13 +33,13 @@ stdout '"Hash": "fc3a09f3dc5cfe0d7a743ea18f1f5226e68b3777"'
 # but still be careful not to include a TagSum or a Ref, especially not Ref set to HEAD,
 # which is easy to do when reusing the cached version from the @latest query.
 go mod download -x -json vcs-test.golang.org/git/hello.git@v0.0.0-20170922010558-fc3a09f3dc5c
-! stderr 'git fetch'
+! stderr 'git( .*)* fetch'
 cp stdout hellopseudo2.json
 cmpenv hellopseudo.json hellopseudo2.json
 
 # go mod download vcstest/hello@hash needs to check TagSum to find pseudoversion base.
 go mod download -x -json vcs-test.golang.org/git/hello.git@fc3a09f3dc5c
-! stderr 'git fetch'
+! stderr 'git( .*)* fetch'
 cp stdout hellohash.json
 stdout '"Version": "v0.0.0-20170922010558-fc3a09f3dc5c"'
 stdout '"Query": "fc3a09f3dc5c"'
@@ -98,7 +98,7 @@ stdout '"RepoSum": "r1:c0/9JCZ25lxoBiK3[+]3BhACU4giH49flcJmBynJ[+]Jvmc="'
 
 # go mod download vcstest/tagtests should invoke git, print origin info
 go mod download -x -json vcs-test.golang.org/git/tagtests.git@latest
-stderr 'git fetch'
+stderr 'git( .*)* fetch'
 cp stdout tagtests.json
 stdout '"Version": "v0.2.2"'
 stdout '"Query": "latest"'
@@ -135,7 +135,7 @@ stdout '"Hash": "c7818c24fa2f3f714c67d0a6d3e411c85a518d1f"'
 
 # go mod download vcstest/prefixtagtests should invoke git, print origin info
 go mod download -x -json vcs-test.golang.org/git/prefixtagtests.git/sub@latest
-stderr 'git fetch'
+stderr 'git( .*)* fetch'
 cp stdout prefixtagtests.json
 stdout '"Version": "v0.0.10"'
 stdout '"Query": "latest"'
@@ -154,12 +154,12 @@ cp stdout all.json
 # clean the module cache, make sure that makes go mod download re-run git fetch, clean again
 go clean -modcache
 go mod download -x -json vcs-test.golang.org/git/hello.git@latest
-stderr 'git fetch'
+stderr 'git( .*)* fetch'
 go clean -modcache
 
 # reuse go mod download vcstest/hello result
 go mod download -reuse=hello.json -x -json vcs-test.golang.org/git/hello.git@latest
-! stderr 'git fetch'
+! stderr 'git( .*)* fetch'
 stdout '"Reuse": true'
 stdout '"Version": "v0.0.0-20170922010558-fc3a09f3dc5c"'
 stdout '"VCS": "git"'
@@ -175,7 +175,7 @@ stdout '"Hash": "fc3a09f3dc5cfe0d7a743ea18f1f5226e68b3777"'
 
 # reuse go mod download vcstest/hello pseudoversion result
 go mod download -reuse=hellopseudo.json -x -json vcs-test.golang.org/git/hello.git@v0.0.0-20170922010558-fc3a09f3dc5c
-! stderr 'git fetch'
+! stderr 'git( .*)* fetch'
 stdout '"Reuse": true'
 stdout '"Version": "v0.0.0-20170922010558-fc3a09f3dc5c"'
 stdout '"VCS": "git"'
@@ -186,7 +186,7 @@ stdout '"Hash": "fc3a09f3dc5cfe0d7a743ea18f1f5226e68b3777"'
 
 # reuse go mod download vcstest/hello@hash
 go mod download -reuse=hellohash.json -x -json vcs-test.golang.org/git/hello.git@fc3a09f3dc5c
-! stderr 'git fetch'
+! stderr 'git( .*)* fetch'
 stdout '"Reuse": true'
 stdout '"Query": "fc3a09f3dc5c"'
 stdout '"Version": "v0.0.0-20170922010558-fc3a09f3dc5c"'
@@ -199,7 +199,7 @@ stdout '"Hash": "fc3a09f3dc5cfe0d7a743ea18f1f5226e68b3777"'
 
 # reuse go mod download vcstest/hello/v9 error result
 ! go mod download -reuse=hellov9.json -x -json vcs-test.golang.org/git/hello.git/v9@latest
-! stderr 'git fetch'
+! stderr 'git( .*)* fetch'
 stdout '"Reuse": true'
 stdout '"Error":.*no matching versions'
 ! stdout '"TagPrefix"'
@@ -210,7 +210,7 @@ stdout '"Hash": "fc3a09f3dc5cfe0d7a743ea18f1f5226e68b3777"'
 
 # reuse go mod download vcstest/hello/sub/v9 error result
 ! go mod download -reuse=hellosubv9.json -x -json vcs-test.golang.org/git/hello.git/sub/v9@latest
-! stderr 'git fetch'
+! stderr 'git( .*)* fetch'
 stdout '"Reuse": true'
 stdout '"Error":.*no matching versions'
 stdout '"TagPrefix": "sub/"'
@@ -221,7 +221,7 @@ stdout '"Hash": "fc3a09f3dc5cfe0d7a743ea18f1f5226e68b3777"'
 
 # reuse go mod download vcstest/hello@nonexist
 ! go mod download -reuse=hellononexist.json -x -json vcs-test.golang.org/git/hello.git@nonexist
-! stderr 'git fetch'
+! stderr 'git( .*)* fetch'
 stdout '"Reuse": true'
 stdout '"Version": "nonexist"'
 stdout '"Error":.*unknown revision nonexist'
@@ -231,7 +231,7 @@ stdout '"RepoSum": "r1:c0/9JCZ25lxoBiK3[+]3BhACU4giH49flcJmBynJ[+]Jvmc="'
 
 # reuse go mod download vcstest/hello@1234567890123456789012345678901234567890
 ! go mod download -reuse=hellononhash.json -x -json vcs-test.golang.org/git/hello.git@1234567890123456789012345678901234567890
-! stderr 'git fetch'
+! stderr 'git( .*)* fetch'
 stdout '"Reuse": true'
 stdout '"Version": "1234567890123456789012345678901234567890"'
 stdout '"Error":.*unknown revision 1234567890123456789012345678901234567890'
@@ -241,7 +241,7 @@ stdout '"RepoSum": "r1:c0/9JCZ25lxoBiK3[+]3BhACU4giH49flcJmBynJ[+]Jvmc="'
 
 # reuse go mod download vcstest/hello@v0.0.0-20220101120101-123456789abc
 ! go mod download -reuse=hellononpseudo.json -x -json vcs-test.golang.org/git/hello.git@v0.0.0-20220101120101-123456789abc
-! stderr 'git fetch'
+! stderr 'git( .*)* fetch'
 stdout '"Reuse": true'
 stdout '"Version": "v0.0.0-20220101120101-123456789abc"'
 stdout '"Error":.*unknown revision 123456789abc'
@@ -251,7 +251,7 @@ stdout '"RepoSum": "r1:c0/9JCZ25lxoBiK3[+]3BhACU4giH49flcJmBynJ[+]Jvmc="'
 
 # reuse go mod download vcstest/tagtests result
 go mod download -reuse=tagtests.json -x -json vcs-test.golang.org/git/tagtests.git@latest
-! stderr 'git fetch'
+! stderr 'git( .*)* fetch'
 stdout '"Reuse": true'
 stdout '"Version": "v0.2.2"'
 stdout '"Query": "latest"'
@@ -265,7 +265,7 @@ stdout '"Hash": "59356c8cd18c5fe9a598167d98a6843e52d57952"'
 
 # reuse go mod download vcstest/tagtests@v0.2.2 result
 go mod download -reuse=tagtestsv022.json -x -json vcs-test.golang.org/git/tagtests.git@v0.2.2
-! stderr 'git fetch'
+! stderr 'git( .*)* fetch'
 stdout '"Reuse": true'
 stdout '"Version": "v0.2.2"'
 ! stdout '"Query":'
@@ -279,7 +279,7 @@ stdout '"Hash": "59356c8cd18c5fe9a598167d98a6843e52d57952"'
 
 # reuse go mod download vcstest/tagtests@master result
 go mod download -reuse=tagtestsmaster.json -x -json vcs-test.golang.org/git/tagtests.git@master
-! stderr 'git fetch'
+! stderr 'git( .*)* fetch'
 stdout '"Reuse": true'
 stdout '"Version": "v0.2.3-0.20190509225625-c7818c24fa2f"'
 stdout '"Query": "master"'
@@ -293,7 +293,7 @@ stdout '"Hash": "c7818c24fa2f3f714c67d0a6d3e411c85a518d1f"'
 
 # reuse go mod download vcstest/tagtests@master result again with all.json
 go mod download -reuse=all.json -x -json vcs-test.golang.org/git/tagtests.git@master
-! stderr 'git fetch'
+! stderr 'git( .*)* fetch'
 stdout '"Reuse": true'
 stdout '"Version": "v0.2.3-0.20190509225625-c7818c24fa2f"'
 stdout '"Query": "master"'
@@ -307,7 +307,7 @@ stdout '"Hash": "c7818c24fa2f3f714c67d0a6d3e411c85a518d1f"'
 
 # go mod download vcstest/prefixtagtests result with json
 go mod download -reuse=prefixtagtests.json -x -json vcs-test.golang.org/git/prefixtagtests.git/sub@latest
-! stderr 'git fetch'
+! stderr 'git( .*)* fetch'
 stdout '"Version": "v0.0.10"'
 stdout '"Query": "latest"'
 stdout '"VCS": "git"'
@@ -321,7 +321,7 @@ stdout '"Hash": "2b7c4692e12c109263cab51b416fcc835ddd7eae"'
 
 # reuse the bulk results with all.json
 ! go mod download -reuse=all.json -json vcs-test.golang.org/git/hello.git@latest vcs-test.golang.org/git/hello.git/v9@latest vcs-test.golang.org/git/hello.git/sub/v9@latest vcs-test.golang.org/git/tagtests.git@latest vcs-test.golang.org/git/tagtests.git@v0.2.2 vcs-test.golang.org/git/tagtests.git@master
-! stderr 'git fetch'
+! stderr 'git( .*)* fetch'
 stdout '"Reuse": true'
 ! stdout '"(Dir|Info|GoMod|Zip)"'
 
@@ -329,7 +329,7 @@ stdout '"Reuse": true'
 cp tagtestsv022.json tagtestsv022badhash.json
 replace '57952' '56952XXX' tagtestsv022badhash.json
 go mod download -reuse=tagtestsv022badhash.json -x -json vcs-test.golang.org/git/tagtests.git@v0.2.2
-stderr 'git fetch'
+stderr 'git( .*)* fetch'
 ! stdout '"Reuse": true'
 stdout '"Version": "v0.2.2"'
 ! stdout '"Query"'

src/cmd/go/testdata/script/test_fuzz_cgo.txt

@@ -0,0 +1,28 @@
+[!fuzz] skip
+[!cgo] skip
+[short] skip
+env GOCACHE=$WORK/cache
+
+# Test that fuzzing works with cgo (issue 65169)
+
+go test -fuzz=. -fuzztime=1x
+stdout ok
+! stdout FAIL
+
+-- go.mod --
+module example.com/p
+
+go 1.20
+-- c.go --
+package p
+
+import "C"
+-- c_test.go --
+package p
+
+import "testing"
+
+func Fuzz(f *testing.F) {
+	f.Add(0)
+	f.Fuzz(func(t *testing.T, x int) {})
+}

src/cmd/go/testdata/script/test_ppc64_linker_funcs.txt

@@ -14,6 +14,10 @@ go build -ldflags='-linkmode=internal'
 exec ./abitest
 stdout success
 
+go build -buildmode=pie -o abitest.pie -ldflags='-linkmode=internal'
+exec ./abitest.pie
+stdout success
+
 -- go.mod --
 module abitest
 

src/cmd/internal/cov/readcovdata.go

@@ -204,15 +204,12 @@ func (r *CovDataReader) visitPod(p pods.Pod) error {
 	}
 	r.vis.VisitMetaDataFile(p.MetaFile, mfr)
 
-	// Read counter data files.
-	for k, cdf := range p.CounterDataFiles {
+	processCounterDataFile := func(cdf string, k int) error {
 		cf, err := os.Open(cdf)
 		if err != nil {
 			return r.fatal("opening counter data file %s: %s", cdf, err)
 		}
-		defer func(f *os.File) {
-			f.Close()
-		}(cf)
+		defer cf.Close()
 		var mr *MReader
 		mr, err = NewMreader(cf)
 		if err != nil {
@@ -236,6 +233,14 @@ func (r *CovDataReader) visitPod(p pods.Pod) error {
 			r.vis.VisitFuncCounterData(data)
 		}
 		r.vis.EndCounterDataFile(cdf, cdr, p.Origins[k])
+		return nil
+	}
+
+	// Read counter data files.
+	for k, cdf := range p.CounterDataFiles {
+		if err := processCounterDataFile(cdf, k); err != nil {
+			return err
+		}
 	}
 	r.vis.EndCounters()
 

src/cmd/internal/obj/ppc64/obj9.go

@@ -37,6 +37,7 @@ import (
 	"internal/abi"
 	"log"
 	"math/bits"
+	"strings"
 )
 
 // Test if this value can encoded as a mask for
@@ -72,6 +73,22 @@ func encodePPC64RLDCMask(mask int64) (mb, me int) {
 	return mb, me - 1
 }
 
+// Is this a symbol which should never have a TOC prologue generated?
+// These are special functions which should not have a TOC regeneration
+// prologue.
+func isNOTOCfunc(name string) bool {
+	switch {
+	case name == "runtime.duffzero":
+		return true
+	case name == "runtime.duffcopy":
+		return true
+	case strings.HasPrefix(name, "runtime.elf_"):
+		return true
+	default:
+		return false
+	}
+}
+
 func progedit(ctxt *obj.Link, p *obj.Prog, newprog obj.ProgAlloc) {
 	p.From.Class = 0
 	p.To.Class = 0
@@ -158,8 +175,8 @@ func progedit(ctxt *obj.Link, p *obj.Prog, newprog obj.ProgAlloc) {
 			// Is this a shifted 16b constant? If so, rewrite it to avoid a creating and loading a constant.
 			val := p.From.Offset
 			shift := bits.TrailingZeros64(uint64(val))
-			mask := 0xFFFF << shift
-			if val&int64(mask) == val || (val>>(shift+16) == -1 && (val>>shift)<<shift == val) {
+			mask := int64(0xFFFF) << shift
+			if val&mask == val || (val>>(shift+16) == -1 && (val>>shift)<<shift == val) {
 				// Rewrite this value into MOVD $const>>shift, Rto; SLD $shift, Rto
 				q := obj.Appendp(p, c.newprog)
 				q.As = ASLD
@@ -762,7 +779,7 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
 
 			q = p
 
-			if NeedTOCpointer(c.ctxt) && c.cursym.Name != "runtime.duffzero" && c.cursym.Name != "runtime.duffcopy" {
+			if NeedTOCpointer(c.ctxt) && !isNOTOCfunc(c.cursym.Name) {
 				// When compiling Go into PIC, without PCrel support, all functions must start
 				// with instructions to load the TOC pointer into r2:
 				//

src/cmd/link/internal/amd64/asm.go

@@ -398,6 +398,13 @@ func adddynrel(target *ld.Target, ldr *loader.Loader, syms *ld.ArchSyms, s loade
 			// (e.g. go version).
 			return true
 		}
+	case objabi.R_GOTPCREL:
+		if target.IsExternal() {
+			// External linker will do this relocation.
+			return true
+		}
+		// We only need to handle external linking mode, as R_GOTPCREL can
+		// only occur in plugin or shared build modes.
 	}
 
 	return false

src/cmd/link/internal/ld/data.go

@@ -1915,7 +1915,6 @@ func (state *dodataState) allocateDataSections(ctxt *Link) {
 	sect = state.allocateNamedSectionAndAssignSyms(&Segdata, ".noptrbss", sym.SNOPTRBSS, sym.Sxxx, 06)
 	ldr.SetSymSect(ldr.LookupOrCreateSym("runtime.noptrbss", 0), sect)
 	ldr.SetSymSect(ldr.LookupOrCreateSym("runtime.enoptrbss", 0), sect)
-	ldr.SetSymSect(ldr.LookupOrCreateSym("runtime.end", 0), sect)
 
 	// Code coverage counters are assigned to the .noptrbss section.
 	// We assign them in a separate pass so that they stay aggregated
@@ -1935,6 +1934,9 @@ func (state *dodataState) allocateDataSections(ctxt *Link) {
 		ldr.SetSymSect(ldr.LookupOrCreateSym("internal/fuzz._ecounters", 0), sect)
 	}
 
+	// Assign runtime.end to the last section of data segment.
+	ldr.SetSymSect(ldr.LookupOrCreateSym("runtime.end", 0), Segdata.Sections[len(Segdata.Sections)-1])
+
 	if len(state.data[sym.STLSBSS]) > 0 {
 		var sect *sym.Section
 		// FIXME: not clear why it is sometimes necessary to suppress .tbss section creation.

src/cmd/link/internal/ld/elf.go

@@ -805,13 +805,19 @@ func elfwritefreebsdsig(out *OutBuf) int {
 	return int(sh.Size)
 }
 
-func addbuildinfo(val string) {
+func addbuildinfo(ctxt *Link) {
+	val := *flagHostBuildid
 	if val == "gobuildid" {
 		buildID := *flagBuildid
 		if buildID == "" {
 			Exitf("-B gobuildid requires a Go build ID supplied via -buildid")
 		}
 
+		if ctxt.IsDarwin() {
+			buildinfo = uuidFromGoBuildId(buildID)
+			return
+		}
+
 		hashedBuildID := notsha256.Sum256([]byte(buildID))
 		buildinfo = hashedBuildID[:20]
 
@@ -821,11 +827,13 @@ func addbuildinfo(val string) {
 	if !strings.HasPrefix(val, "0x") {
 		Exitf("-B argument must start with 0x: %s", val)
 	}
-
 	ov := val
 	val = val[2:]
 
-	const maxLen = 32
+	maxLen := 32
+	if ctxt.IsDarwin() {
+		maxLen = 16
+	}
 	if hex.DecodedLen(len(val)) > maxLen {
 		Exitf("-B option too long (max %d digits): %s", maxLen, ov)
 	}

src/cmd/link/internal/ld/lib.go

@@ -1954,7 +1954,15 @@ func (ctxt *Link) hostlink() {
 		cmd := exec.Command(dsymutilCmd, "-f", *flagOutfile, "-o", dsym)
 		// dsymutil may not clean up its temp directory at exit.
 		// Set DSYMUTIL_REPRODUCER_PATH to work around. see issue 59026.
-		cmd.Env = append(os.Environ(), "DSYMUTIL_REPRODUCER_PATH="+*flagTmpdir)
+		// dsymutil (Apple LLVM version 16.0.0) deletes the directory
+		// even if it is not empty. We still need our tmpdir, so give a
+		// subdirectory to dsymutil.
+		dsymDir := filepath.Join(*flagTmpdir, "dsymutil")
+		err = os.MkdirAll(dsymDir, 0777)
+		if err != nil {
+			Exitf("fail to create temp dir: %v", err)
+		}
+		cmd.Env = append(os.Environ(), "DSYMUTIL_REPRODUCER_PATH="+dsymDir)
 		if ctxt.Debugvlog != 0 {
 			ctxt.Logf("host link dsymutil:")
 			for _, v := range cmd.Args {

src/cmd/link/internal/ld/macho.go

@@ -296,6 +296,8 @@ func getMachoHdr() *MachoHdr {
 	return &machohdr
 }
 
+// Create a new Mach-O load command. ndata is the number of 32-bit words for
+// the data (not including the load command header).
 func newMachoLoad(arch *sys.Arch, type_ uint32, ndata uint32) *MachoLoad {
 	if arch.PtrSize == 8 && (ndata&1 != 0) {
 		ndata++
@@ -850,6 +852,20 @@ func asmbMacho(ctxt *Link) {
 			}
 		}
 
+		if ctxt.IsInternal() && len(buildinfo) > 0 {
+			ml := newMachoLoad(ctxt.Arch, LC_UUID, 4)
+			// Mach-O UUID is 16 bytes
+			if len(buildinfo) < 16 {
+				buildinfo = append(buildinfo, make([]byte, 16)...)
+			}
+			// By default, buildinfo is already in UUIDv3 format
+			// (see uuidFromGoBuildId).
+			ml.data[0] = ctxt.Arch.ByteOrder.Uint32(buildinfo)
+			ml.data[1] = ctxt.Arch.ByteOrder.Uint32(buildinfo[4:])
+			ml.data[2] = ctxt.Arch.ByteOrder.Uint32(buildinfo[8:])
+			ml.data[3] = ctxt.Arch.ByteOrder.Uint32(buildinfo[12:])
+		}
+
 		if ctxt.IsInternal() && ctxt.NeedCodeSign() {
 			ml := newMachoLoad(ctxt.Arch, LC_CODE_SIGNATURE, 2)
 			ml.data[0] = uint32(codesigOff)
@@ -901,21 +917,25 @@ func collectmachosyms(ctxt *Link) {
 	// Add special runtime.text and runtime.etext symbols (which are local).
 	// We've already included this symbol in Textp on darwin if ctxt.DynlinkingGo().
 	// See data.go:/textaddress
+	// NOTE: runtime.text.N symbols (if we split text sections) are not added, though,
+	// so we handle them here.
 	if !*FlagS {
 		if !ctxt.DynlinkingGo() {
 			s := ldr.Lookup("runtime.text", 0)
 			if ldr.SymType(s) == sym.STEXT {
 				addsym(s)
 			}
-			for n := range Segtext.Sections[1:] {
-				s := ldr.Lookup(fmt.Sprintf("runtime.text.%d", n+1), 0)
-				if s != 0 {
-					addsym(s)
-				} else {
-					break
-				}
+		}
+		for n := range Segtext.Sections[1:] {
+			s := ldr.Lookup(fmt.Sprintf("runtime.text.%d", n+1), 0)
+			if s != 0 {
+				addsym(s)
+			} else {
+				break
 			}
-			s = ldr.Lookup("runtime.etext", 0)
+		}
+		if !ctxt.DynlinkingGo() {
+			s := ldr.Lookup("runtime.etext", 0)
 			if ldr.SymType(s) == sym.STEXT {
 				addsym(s)
 			}

src/cmd/link/internal/ld/macho_update_uuid.go

@@ -0,0 +1,47 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package ld
+
+// This file provides helper functions for updating/rewriting the UUID
+// load command within a Go go binary generated on Darwin using
+// external linking. Why is it necessary to update the UUID load
+// command? See issue #64947 for more detail, but the short answer is
+// that newer versions of the Macos toolchain (the newer linker in
+// particular) appear to compute the UUID based not just on the
+// content of the object files being linked but also on things like
+// the timestamps/paths of the objects; this makes it
+// difficult/impossible to support reproducible builds. Since we try
+// hard to maintain build reproducibility for Go, the APIs here
+// compute a new UUID (based on the Go build ID) and write it to the
+// final executable generated by the external linker.
+
+import (
+	"cmd/internal/notsha256"
+)
+
+// uuidFromGoBuildId hashes the Go build ID and returns a slice of 16
+// bytes suitable for use as the payload in a Macho LC_UUID load
+// command.
+func uuidFromGoBuildId(buildID string) []byte {
+	if buildID == "" {
+		return make([]byte, 16)
+	}
+	hashedBuildID := notsha256.Sum256([]byte(buildID))
+	rv := hashedBuildID[:16]
+
+	// RFC 4122 conformance (see RFC 4122 Sections 4.2.2, 4.1.3). We
+	// want the "version" of this UUID to appear as 'hashed' as opposed
+	// to random or time-based.  This is something of a fiction since
+	// we're not actually hashing using MD5 or SHA1, but it seems better
+	// to use this UUID flavor than any of the others. This is similar
+	// to how other linkers handle this (for example this code in lld:
+	// https://github.com/llvm/llvm-project/blob/2a3a79ce4c2149d7787d56f9841b66cacc9061d0/lld/MachO/Writer.cpp#L524).
+	rv[6] &= 0x0f
+	rv[6] |= 0x30
+	rv[8] &= 0x3f
+	rv[8] |= 0xc0
+
+	return rv
+}

src/cmd/link/internal/ld/main.go

@@ -93,6 +93,7 @@ var (
 	flagN             = flag.Bool("n", false, "no-op (deprecated)")
 	FlagS             = flag.Bool("s", false, "disable symbol table")
 	flag8             bool // use 64-bit addresses in symbol table
+	flagHostBuildid   = flag.String("B", "", "set ELF NT_GNU_BUILD_ID `note` or Mach-O UUID; use \"gobuildid\" to generate it from the Go build ID")
 	flagInterpreter   = flag.String("I", "", "use `linker` as ELF dynamic linker")
 	FlagDebugTramp    = flag.Int("debugtramp", 0, "debug trampolines")
 	FlagDebugTextSize = flag.Int("debugtextsize", 0, "debug text section max size")
@@ -190,7 +191,6 @@ func Main(arch *sys.Arch, theArch Arch) {
 	flag.Var(&ctxt.LinkMode, "linkmode", "set link `mode`")
 	flag.Var(&ctxt.BuildMode, "buildmode", "set build `mode`")
 	flag.BoolVar(&ctxt.compressDWARF, "compressdwarf", true, "compress DWARF if possible")
-	objabi.Flagfn1("B", "add an ELF NT_GNU_BUILD_ID `note` when using ELF; use \"gobuildid\" to generate it from the Go build ID", addbuildinfo)
 	objabi.Flagfn1("L", "add specified `directory` to library path", func(a string) { Lflag(ctxt, a) })
 	objabi.AddVersionFlag() // -V
 	objabi.Flagfn1("X", "add string value `definition` of the form importpath.name=value", func(s string) { addstrdata1(ctxt, s) })
@@ -287,6 +287,10 @@ func Main(arch *sys.Arch, theArch Arch) {
 		*flagBuildid = "go-openbsd"
 	}
 
+	if *flagHostBuildid != "" {
+		addbuildinfo(ctxt)
+	}
+
 	// enable benchmarking
 	var bench *benchmark.Metrics
 	if len(*benchmarkFlag) != 0 {

src/cmd/link/internal/ppc64/asm.go

@@ -474,24 +474,9 @@ func rewriteABIFuncReloc(ctxt *ld.Link, ldr *loader.Loader, tname string, r load
 	r.SetAdd(int64((n - minReg) * offMul))
 	firstUse = !ldr.AttrReachable(ts)
 	if firstUse {
-		ldr.SetAttrReachable(ts, true)
 		// This function only becomes reachable now. It has been dropped from
 		// the text section (it was unreachable until now), it needs included.
-		//
-		// Similarly, TOC regeneration should not happen for these functions,
-		// remove it from this save/restore function.
-		if ldr.AttrShared(ts) {
-			sb := ldr.MakeSymbolUpdater(ts)
-			sb.SetData(sb.Data()[8:])
-			sb.SetSize(sb.Size() - 8)
-			relocs := sb.Relocs()
-			// Only one PCREL reloc to .TOC. should be present.
-			if relocs.Count() != 1 {
-				log.Fatalf("Unexpected number of relocs in %s\n", ldr.SymName(ts))
-			}
-			sb.ResetRelocs()
-
-		}
+		ldr.SetAttrReachable(ts, true)
 	}
 	return ts, firstUse
 }

src/cmd/link/internal/riscv64/asm.go

@@ -170,8 +170,8 @@ func genSymsLate(ctxt *ld.Link, ldr *loader.Loader) {
 		relocs := ldr.Relocs(s)
 		for ri := 0; ri < relocs.Count(); ri++ {
 			r := relocs.At(ri)
-			if r.Type() != objabi.R_RISCV_PCREL_ITYPE && r.Type() != objabi.R_RISCV_PCREL_STYPE &&
-				r.Type() != objabi.R_RISCV_TLS_IE {
+			if r.Type() != objabi.R_RISCV_CALL && r.Type() != objabi.R_RISCV_PCREL_ITYPE &&
+				r.Type() != objabi.R_RISCV_PCREL_STYPE && r.Type() != objabi.R_RISCV_TLS_IE {
 				continue
 			}
 			if r.Off() == 0 && ldr.SymType(s) == sym.STEXT {

src/cmd/trace/v2/gen.go

@@ -31,6 +31,9 @@ type generator interface {
 	ProcRange(ctx *traceContext, ev *tracev2.Event)
 	ProcTransition(ctx *traceContext, ev *tracev2.Event)
 
+	// User annotations.
+	Log(ctx *traceContext, ev *tracev2.Event)
+
 	// Finish indicates the end of the trace and finalizes generation.
 	Finish(ctx *traceContext)
 }
@@ -69,6 +72,8 @@ func runGenerator(ctx *traceContext, g generator, parsed *parsedTrace, opts *gen
 			case tracev2.ResourceGoroutine:
 				g.GoroutineTransition(ctx, ev)
 			}
+		case tracev2.EventLog:
+			g.Log(ctx, ev)
 		}
 	}
 	for i, task := range opts.tasks {
@@ -357,3 +362,33 @@ type completedRange struct {
 	endStack   tracev2.Stack
 	arg        any
 }
+
+type logEventGenerator[R resource] struct {
+	// getResource is a function to extract a resource ID from a Log event.
+	getResource func(*tracev2.Event) R
+}
+
+// Log implements a log event handler. It expects ev to be one such event.
+func (g *logEventGenerator[R]) Log(ctx *traceContext, ev *tracev2.Event) {
+	id := g.getResource(ev)
+	if id == R(noResource) {
+		// We have nowhere to put this in the UI.
+		return
+	}
+
+	// Construct the name to present.
+	log := ev.Log()
+	name := log.Message
+	if log.Category != "" {
+		name = "[" + log.Category + "] " + name
+	}
+
+	// Emit an instant event.
+	ctx.Instant(traceviewer.InstantEvent{
+		Name:     name,
+		Ts:       ctx.elapsed(ev.Time()),
+		Category: "user event",
+		Resource: uint64(id),
+		Stack:    ctx.Stack(viewerFrames(ev.Stack())),
+	})
+}

src/cmd/trace/v2/goroutinegen.go

@@ -14,6 +14,7 @@ type goroutineGenerator struct {
 	globalRangeGenerator
 	globalMetricGenerator
 	stackSampleGenerator[tracev2.GoID]
+	logEventGenerator[tracev2.GoID]
 
 	gStates map[tracev2.GoID]*gState[tracev2.GoID]
 	focus   tracev2.GoID
@@ -22,9 +23,11 @@ type goroutineGenerator struct {
 
 func newGoroutineGenerator(ctx *traceContext, focus tracev2.GoID, filter map[tracev2.GoID]struct{}) *goroutineGenerator {
 	gg := new(goroutineGenerator)
-	gg.stackSampleGenerator.getResource = func(ev *tracev2.Event) tracev2.GoID {
+	rg := func(ev *tracev2.Event) tracev2.GoID {
 		return ev.Goroutine()
 	}
+	gg.stackSampleGenerator.getResource = rg
+	gg.logEventGenerator.getResource = rg
 	gg.gStates = make(map[tracev2.GoID]*gState[tracev2.GoID])
 	gg.focus = focus
 	gg.filter = filter

src/cmd/trace/v2/goroutines.go

@@ -17,7 +17,6 @@ import (
 	"net/http"
 	"slices"
 	"sort"
-	"strconv"
 	"strings"
 	"time"
 )
@@ -25,31 +24,23 @@ import (
 // GoroutinesHandlerFunc returns a HandlerFunc that serves list of goroutine groups.
 func GoroutinesHandlerFunc(summaries map[tracev2.GoID]*trace.GoroutineSummary) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
-		// goroutineGroup describes a group of goroutines grouped by start PC.
+		// goroutineGroup describes a group of goroutines grouped by name.
 		type goroutineGroup struct {
-			ID       uint64        // Unique identifier (PC).
 			Name     string        // Start function.
 			N        int           // Total number of goroutines in this group.
 			ExecTime time.Duration // Total execution time of all goroutines in this group.
 		}
-		// Accumulate groups by PC.
-		groupsByPC := make(map[uint64]goroutineGroup)
+		// Accumulate groups by Name.
+		groupsByName := make(map[string]goroutineGroup)
 		for _, summary := range summaries {
-			group := groupsByPC[summary.PC]
-			group.ID = summary.PC
+			group := groupsByName[summary.Name]
 			group.Name = summary.Name
 			group.N++
 			group.ExecTime += summary.ExecTime
-			groupsByPC[summary.PC] = group
+			groupsByName[summary.Name] = group
 		}
 		var groups []goroutineGroup
-		for pc, group := range groupsByPC {
-			group.ID = pc
-			// If goroutine didn't run during the trace (no sampled PC),
-			// the v.ID and v.Name will be zero value.
-			if group.ID == 0 && group.Name == "" {
-				group.Name = "(Inactive, no stack trace sampled)"
-			}
+		for _, group := range groupsByName {
 			groups = append(groups, group)
 		}
 		slices.SortFunc(groups, func(a, b goroutineGroup) int {
@@ -92,7 +83,7 @@ Click a start location to view more details about that group.<br>
   </tr>
 {{range $}}
   <tr>
-    <td><code><a href="/goroutine?id={{.ID}}">{{.Name}}</a></code></td>
+    <td><code><a href="/goroutine?name={{.Name}}">{{or .Name "(Inactive, no stack trace sampled)"}}</a></code></td>
 	<td>{{.N}}</td>
 	<td>{{.ExecTime}}</td>
   </tr>
@@ -106,11 +97,7 @@ Click a start location to view more details about that group.<br>
 // goroutines in a particular group.
 func GoroutineHandler(summaries map[tracev2.GoID]*trace.GoroutineSummary) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
-		pc, err := strconv.ParseUint(r.FormValue("id"), 10, 64)
-		if err != nil {
-			http.Error(w, fmt.Sprintf("failed to parse id parameter '%v': %v", r.FormValue("id"), err), http.StatusInternalServerError)
-			return
-		}
+		goroutineName := r.FormValue("name")
 
 		type goroutine struct {
 			*trace.GoroutineSummary
@@ -130,7 +117,7 @@ func GoroutineHandler(summaries map[tracev2.GoID]*trace.GoroutineSummary) http.H
 		for _, summary := range summaries {
 			totalExecTime += summary.ExecTime
 
-			if summary.PC != pc {
+			if summary.Name != goroutineName {
 				continue
 			}
 			nonOverlappingStats := summary.NonOverlappingStats()
@@ -198,9 +185,8 @@ func GoroutineHandler(summaries map[tracev2.GoID]*trace.GoroutineSummary) http.H
 		}
 		sort.Strings(allRangeStats)
 
-		err = templGoroutine.Execute(w, struct {
+		err := templGoroutine.Execute(w, struct {
 			Name                string
-			PC                  uint64
 			N                   int
 			ExecTimePercent     string
 			MaxTotal            time.Duration
@@ -209,7 +195,6 @@ func GoroutineHandler(summaries map[tracev2.GoID]*trace.GoroutineSummary) http.H
 			RangeStats          []string
 		}{
 			Name:                name,
-			PC:                  pc,
 			N:                   len(goroutines),
 			ExecTimePercent:     execTimePercent,
 			MaxTotal:            maxTotalTime,
@@ -339,19 +324,19 @@ Table of contents
 	</tr>
 	<tr>
 		<td>Network wait profile:</td>
-		<td> <a href="/io?id={{.PC}}">graph</a> <a href="/io?id={{.PC}}&raw=1" download="io.profile">(download)</a></td>
+		<td> <a href="/io?name={{.Name}}">graph</a> <a href="/io?name={{.Name}}&raw=1" download="io.profile">(download)</a></td>
 	</tr>
 	<tr>
 		<td>Sync block profile:</td>
-		<td> <a href="/block?id={{.PC}}">graph</a> <a href="/block?id={{.PC}}&raw=1" download="block.profile">(download)</a></td>
+		<td> <a href="/block?name={{.Name}}">graph</a> <a href="/block?name={{.Name}}&raw=1" download="block.profile">(download)</a></td>
 	</tr>
 	<tr>
 		<td>Syscall profile:</td>
-		<td> <a href="/syscall?id={{.PC}}">graph</a> <a href="/syscall?id={{.PC}}&raw=1" download="syscall.profile">(download)</a></td>
+		<td> <a href="/syscall?name={{.Name}}">graph</a> <a href="/syscall?name={{.Name}}&raw=1" download="syscall.profile">(download)</a></td>
 		</tr>
 	<tr>
 		<td>Scheduler wait profile:</td>
-		<td> <a href="/sched?id={{.PC}}">graph</a> <a href="/sched?id={{.PC}}&raw=1" download="sched.profile">(download)</a></td>
+		<td> <a href="/sched?name={{.Name}}">graph</a> <a href="/sched?name={{.Name}}&raw=1" download="sched.profile">(download)</a></td>
 	</tr>
 </table>
 

src/cmd/trace/v2/jsontrace_test.go

@@ -167,8 +167,8 @@ func checkNetworkUnblock(t *testing.T, data format.Data) {
 	if netBlockEv == nil {
 		t.Error("failed to find a network unblock")
 	}
-	if count == 0 || count > 2 {
-		t.Errorf("found too many network block events: want 1 or 2, found %d", count)
+	if count == 0 {
+		t.Errorf("found zero network block events, want at least one")
 	}
 	// TODO(mknyszek): Check for the flow of this event to some slice event of a goroutine running.
 }

src/cmd/trace/v2/main.go

@@ -28,6 +28,35 @@ func Main(traceFile, httpAddr, pprof string, debug int) error {
 	}
 	defer tracef.Close()
 
+	// Handle requests for profiles.
+	if pprof != "" {
+		parsed, err := parseTrace(tracef)
+		if err != nil {
+			return err
+		}
+		var f traceviewer.ProfileFunc
+		switch pprof {
+		case "net":
+			f = pprofByGoroutine(computePprofIO(), parsed)
+		case "sync":
+			f = pprofByGoroutine(computePprofBlock(), parsed)
+		case "syscall":
+			f = pprofByGoroutine(computePprofSyscall(), parsed)
+		case "sched":
+			f = pprofByGoroutine(computePprofSched(), parsed)
+		default:
+			return fmt.Errorf("unknown pprof type %s\n", pprof)
+		}
+		records, err := f(&http.Request{})
+		if err != nil {
+			return fmt.Errorf("failed to generate pprof: %v\n", err)
+		}
+		if err := traceviewer.BuildProfile(records).Write(os.Stdout); err != nil {
+			return fmt.Errorf("failed to generate pprof: %v\n", err)
+		}
+		return nil
+	}
+
 	// Debug flags.
 	switch debug {
 	case 1:

src/cmd/trace/v2/pprof.go

@@ -14,15 +14,14 @@ import (
 	tracev2 "internal/trace/v2"
 	"net/http"
 	"slices"
-	"strconv"
 	"strings"
 	"time"
 )
 
 func pprofByGoroutine(compute computePprofFunc, t *parsedTrace) traceviewer.ProfileFunc {
 	return func(r *http.Request) ([]traceviewer.ProfileRecord, error) {
-		id := r.FormValue("id")
-		gToIntervals, err := pprofMatchingGoroutines(id, t)
+		name := r.FormValue("name")
+		gToIntervals, err := pprofMatchingGoroutines(name, t)
 		if err != nil {
 			return nil, err
 		}
@@ -44,20 +43,12 @@ func pprofByRegion(compute computePprofFunc, t *parsedTrace) traceviewer.Profile
 	}
 }
 
-// pprofMatchingGoroutines parses the goroutine type id string (i.e. pc)
-// and returns the ids of goroutines of the matching type and its interval.
+// pprofMatchingGoroutines returns the ids of goroutines of the matching name and its interval.
 // If the id string is empty, returns nil without an error.
-func pprofMatchingGoroutines(id string, t *parsedTrace) (map[tracev2.GoID][]interval, error) {
-	if id == "" {
-		return nil, nil
-	}
-	pc, err := strconv.ParseUint(id, 10, 64) // id is string
-	if err != nil {
-		return nil, fmt.Errorf("invalid goroutine type: %v", id)
-	}
+func pprofMatchingGoroutines(name string, t *parsedTrace) (map[tracev2.GoID][]interval, error) {
 	res := make(map[tracev2.GoID][]interval)
 	for _, g := range t.summary.Goroutines {
-		if g.PC != pc {
+		if name != "" && g.Name != name {
 			continue
 		}
 		endTime := g.EndTime
@@ -66,8 +57,8 @@ func pprofMatchingGoroutines(id string, t *parsedTrace) (map[tracev2.GoID][]inte
 		}
 		res[g.ID] = []interval{{start: g.StartTime, end: endTime}}
 	}
-	if len(res) == 0 && id != "" {
-		return nil, fmt.Errorf("failed to find matching goroutines for ID: %s", id)
+	if len(res) == 0 {
+		return nil, fmt.Errorf("failed to find matching goroutines for name: %s", name)
 	}
 	return res, nil
 }

src/cmd/trace/v2/procgen.go

@@ -18,6 +18,7 @@ type procGenerator struct {
 	globalMetricGenerator
 	procRangeGenerator
 	stackSampleGenerator[tracev2.ProcID]
+	logEventGenerator[tracev2.ProcID]
 
 	gStates   map[tracev2.GoID]*gState[tracev2.ProcID]
 	inSyscall map[tracev2.ProcID]*gState[tracev2.ProcID]
@@ -26,9 +27,11 @@ type procGenerator struct {
 
 func newProcGenerator() *procGenerator {
 	pg := new(procGenerator)
-	pg.stackSampleGenerator.getResource = func(ev *tracev2.Event) tracev2.ProcID {
+	rg := func(ev *tracev2.Event) tracev2.ProcID {
 		return ev.Proc()
 	}
+	pg.stackSampleGenerator.getResource = rg
+	pg.logEventGenerator.getResource = rg
 	pg.gStates = make(map[tracev2.GoID]*gState[tracev2.ProcID])
 	pg.inSyscall = make(map[tracev2.ProcID]*gState[tracev2.ProcID])
 	return pg

src/cmd/trace/v2/threadgen.go

@@ -17,6 +17,7 @@ type threadGenerator struct {
 	globalRangeGenerator
 	globalMetricGenerator
 	stackSampleGenerator[tracev2.ThreadID]
+	logEventGenerator[tracev2.ThreadID]
 
 	gStates map[tracev2.GoID]*gState[tracev2.ThreadID]
 	threads map[tracev2.ThreadID]struct{}
@@ -24,9 +25,11 @@ type threadGenerator struct {
 
 func newThreadGenerator() *threadGenerator {
 	tg := new(threadGenerator)
-	tg.stackSampleGenerator.getResource = func(ev *tracev2.Event) tracev2.ThreadID {
+	rg := func(ev *tracev2.Event) tracev2.ThreadID {
 		return ev.Thread()
 	}
+	tg.stackSampleGenerator.getResource = rg
+	tg.logEventGenerator.getResource = rg
 	tg.gStates = make(map[tracev2.GoID]*gState[tracev2.ThreadID])
 	tg.threads = make(map[tracev2.ThreadID]struct{})
 	return tg