sorry, my mistake.
I run another benchmark.
This benchmark fails to compile.
On Saturday, March 10, 2018 at 1:27:17 PM UTC-5, di...@veryhaha.com wrote:
>
> It looks CSE doesn't work for the following case.
>
> package main
>
> import (
> "testing"
> )
>
> var v1a int
> func Benchmark_CSE_Case_1a(b *testing.B) {
> s := make([]Element, N)
> b.ResetTimer()
> for i := 0; i < b.N; i++ {
> var x, y, z = 123, 456, 789
> v1a = (y+z) / x + (y+z) / x + (y+z) / x
> }
> }
>
> func Benchmark_CSE_Case_1b(b *testing.B) {
> s := make([]Element, N)
> b.ResetTimer()
> for i := 0; i < b.N; i++ {
> var x, y, z = 123, 456, 789
> t := y+z) / x
> v1a = t + t + t
> }
> }
>
> The result:
>
> $ go test -bench=.
> goos: linux
> goarch: amd64
> Benchmark_SumArrayElements_GlobalVar-4 5000 201535 ns/op
> Benchmark_SumArrayElements_LocalVar-4 30000 39922 ns/op
>
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