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04572fa29b
BMI1 includes four instructions (ANDN, BLSI, BLSMSK, BLSR) that are easy to peephole optimize, and which GCC always seems to favor using when available and applicable. Updates #45453. Change-Id: I0274184057058f5c579e5bc3ea9c414396d3cf46 Reviewed-on: https://go-review.googlesource.com/c/go/+/351130 Run-TryBot: Matthew Dempsky <mdempsky@google.com> Trust: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org>
48 lines
767 B
Go
48 lines
767 B
Go
// asmcheck
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// Copyright 2021 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package codegen
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func andn64(x, y int64) int64 {
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// amd64/v3:"ANDNQ"
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return x &^ y
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}
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func andn32(x, y int32) int32 {
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// amd64/v3:"ANDNL"
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return x &^ y
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}
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func blsi64(x int64) int64 {
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// amd64/v3:"BLSIQ"
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return x & -x
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}
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func blsi32(x int32) int32 {
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// amd64/v3:"BLSIL"
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return x & -x
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}
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func blsmsk64(x int64) int64 {
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// amd64/v3:"BLSMSKQ"
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return x ^ (x - 1)
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}
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func blsmsk32(x int32) int32 {
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// amd64/v3:"BLSMSKL"
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return x ^ (x - 1)
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}
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func blsr64(x int64) int64 {
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// amd64/v3:"BLSRQ"
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return x & (x - 1)
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}
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func blsr32(x int32) int32 {
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// amd64/v3:"BLSRL"
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return x & (x - 1)
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}
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