mirror of
https://github.com/golang/go.git
synced 2026-01-29 15:12:08 +03:00
478d86446e
Fixes #76449 This saves a single byte for the REX prefix per OpCopy it triggers on. Change-Id: I1eab364d07354555ba2f23ffd2f9c522d4a04bd0 Reviewed-on: https://go-review.googlesource.com/c/go/+/731640 Reviewed-by: Michael Pratt <mpratt@google.com> Reviewed-by: Carlos Amedee <carlos@golang.org> Reviewed-by: Keith Randall <khr@golang.org> Auto-Submit: Jorropo <jorropo.pgm@gmail.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
45 lines
1.3 KiB
Go
45 lines
1.3 KiB
Go
// asmcheck
|
|
|
|
// Copyright 2023 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 codegen
|
|
|
|
// A uint16 or sint16 constant shifted left.
|
|
func shifted16BitConstants() (out [64]uint64) {
|
|
// ppc64x: "MOVD [$]8193,", "SLD [$]27,"
|
|
out[0] = 0x0000010008000000
|
|
// ppc64x: "MOVD [$]-32767", "SLD [$]26,"
|
|
out[1] = 0xFFFFFE0004000000
|
|
// ppc64x: "MOVD [$]-1", "SLD [$]48,"
|
|
out[2] = 0xFFFF000000000000
|
|
// ppc64x: "MOVD [$]65535", "SLD [$]44,"
|
|
out[3] = 0x0FFFF00000000000
|
|
return
|
|
}
|
|
|
|
// A contiguous set of 1 bits, potentially wrapping.
|
|
func contiguousMaskConstants() (out [64]uint64) {
|
|
// ppc64x: "MOVD [$]-1", "RLDC R[0-9]+, [$]44, [$]63,"
|
|
out[0] = 0xFFFFF00000000001
|
|
// ppc64x: "MOVD [$]-1", "RLDC R[0-9]+, [$]43, [$]63,"
|
|
out[1] = 0xFFFFF80000000001
|
|
// ppc64x: "MOVD [$]-1", "RLDC R[0-9]+, [$]43, [$]4,"
|
|
out[2] = 0x0FFFF80000000000
|
|
// ppc64x/power8: "MOVD [$]-1", "RLDC R[0-9]+, [$]33, [$]63,"
|
|
// ppc64x/power9: "MOVD [$]-1", "RLDC R[0-9]+, [$]33, [$]63,"
|
|
// ppc64x/power10: "MOVD [$]-8589934591,"
|
|
out[3] = 0xFFFFFFFE00000001
|
|
return
|
|
}
|
|
|
|
func issue76449_1() (_, _, _ uint64) {
|
|
// amd64:-"MOVQ"
|
|
return 0, 0, 0
|
|
}
|
|
func issue76449_2() (_, _, _ uint64) {
|
|
// amd64:-"MOVQ"
|
|
return 1, 2, 1
|
|
}
|