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test/codegen: make sure assignment results are used.

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Some tests make assignments to an argument without reading it.
With CL 708865, they are treated as dead stores and are removed.
Make sure the results are used.

Fixes #75745.
Fixes #75746.

Change-Id: I05580beb1006505ec1550e5fa245b54dcefd10b9
Reviewed-on: https://go-review.googlesource.com/c/go/+/708916
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Cherry Mui
2025-10-04 11:32:33 -04:00
parent 4fca79833f
commit 1d62e92567
2 changed files with 6 additions and 3 deletions
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6
test/codegen/constants.go
View File

@@ -7,7 +7,7 @@
package codegen
// A uint16 or sint16 constant shifted left.
func shifted16BitConstants(out [64]uint64) {
func shifted16BitConstants() (out [64]uint64) {
// ppc64x: "MOVD\t[$]8193,", "SLD\t[$]27,"
out[0] = 0x0000010008000000
// ppc64x: "MOVD\t[$]-32767", "SLD\t[$]26,"
@@ -16,10 +16,11 @@ func shifted16BitConstants(out [64]uint64) {
out[2] = 0xFFFF000000000000
// ppc64x: "MOVD\t[$]65535", "SLD\t[$]44,"
out[3] = 0x0FFFF00000000000
return
}
// A contiguous set of 1 bits, potentially wrapping.
func contiguousMaskConstants(out [64]uint64) {
func contiguousMaskConstants() (out [64]uint64) {
// ppc64x: "MOVD\t[$]-1", "RLDC\tR[0-9]+, [$]44, [$]63,"
out[0] = 0xFFFFF00000000001
// ppc64x: "MOVD\t[$]-1", "RLDC\tR[0-9]+, [$]43, [$]63,"
@@ -30,4 +31,5 @@ func contiguousMaskConstants(out [64]uint64) {
// ppc64x/power9: "MOVD\t[$]-1", "RLDC\tR[0-9]+, [$]33, [$]63,"
// ppc64x/power10: "MOVD\t[$]-8589934591,"
out[3] = 0xFFFFFFFE00000001
return
}

3
test/codegen/mathbits.go
View File

@@ -731,7 +731,7 @@ func Add64MPanicOnOverflowGT(a, b [2]uint64) [2]uint64 {
//
// This is what happened on PPC64 when compiling
// crypto/internal/edwards25519/field.feMulGeneric.
func Add64MultipleChains(a, b, c, d [2]uint64) {
func Add64MultipleChains(a, b, c, d [2]uint64) [2]uint64 {
var cx, d1, d2 uint64
a1, a2 := a[0], a[1]
b1, b2 := b[0], b[1]
@@ -748,6 +748,7 @@ func Add64MultipleChains(a, b, c, d [2]uint64) {
d2, _ = bits.Add64(c2, d2, cx)
d[0] = d1
d[1] = d2
return d
}
// --------------- //