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20d7c57422
Look for possible paired load/store operations on arm64. I don't expect this would be a lot faster, but it will save binary space, and indirectly through the icache at least a bit of time. Change-Id: I4dd73b0e6329c4659b7453998f9b75320fcf380b Reviewed-on: https://go-review.googlesource.com/c/go/+/629256 LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: David Chase <drchase@google.com> Auto-Submit: Keith Randall <khr@golang.org> Reviewed-by: Keith Randall <khr@google.com>
29 lines
550 B
Go
29 lines
550 B
Go
// errorcheck -0 -d=ssa/tighten/debug=1
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//go:build arm64
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// Copyright 2023 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 main
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var (
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ga, gb, gc, gd int
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)
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func moveValuesWithMemoryArg(len int) {
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for n := 0; n < len; n++ {
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// Loads of b and d can be delayed until inside the outer "if".
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a := ga
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b := gb // ERROR "MOVDload is moved$"
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c := gc
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d := gd // ERROR "MOVDload is moved$"
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if a == c {
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if b == d {
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return
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}
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}
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}
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}
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