Is it possible that gc automatically replaces the "_" with a hidden
declared package-level variable?
On Wednesday, June 23, 2021 at 1:14:36 AM UTC-4 tapi...@gmail.com wrote:
> The code:
>
> package concat
>
> import (
> "testing"
> )
>
> var s33 = []byte{32: 'b'}
> var a = string(s33)
>
>
> func Benchmark_e_33(b *testing.B) {
> for i := 0; i < b.N; i++ {
> _ = a + a // a + a does not escape
> }
> }
>
> "go test -gcflags=-m" shows: a + a does not escape
> but "go test -bench=. -benchmem" shows:
> Benchmark_e_33-4 16544446 68.35 ns/op 80 B/op
> 1 allocs/op
>
> In my impression, memory blocks allocated on stack are not counted in the
> bench result.
>
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