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cmd/compile: constant division optimization is disabled on arm64 #15382

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zhongweiy opened this issue Apr 20, 2016 · 1 comment
Closed

cmd/compile: constant division optimization is disabled on arm64 #15382

zhongweiy opened this issue Apr 20, 2016 · 1 comment
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@zhongweiy
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  1. What version of Go are you using (go version)?
    go version devel +2c84188 Wed Apr 20 15:36:09 2016 +0800 linux/arm64
  2. What operating system and processor architecture are you using (go env)?
    GOARCH="arm64" GOBIN="" GOEXE="" GOHOSTARCH="arm64" GOHOSTOS="linux" GOOS="linux" GOPATH="/home/zw/go" GORACE="" GOROOT="/home/zw/project/go" GOTOOLDIR="/home/zw/project/go/pkg/tool/linux_arm64" CC="gcc" GOGCCFLAGS="-fPIC -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build288440353=/tmp/go-build -gno-record-gcc-switches" CXX="g++" CGO_ENABLED="1"
  3. What did you do?
    do constant division like:
    func divint64n(x int64) int64 { return x / 7 }

compile above code and dump it on arm64 linux.

  1. What did you expect to see?
    dumped code should not call div instruction for constant division.
  2. What did you see instead?
    dumped code calls div instruction for constant division.
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CL https://golang.org/cl/22292 mentions this issue.

@golang golang locked and limited conversation to collaborators Apr 27, 2017
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