It does not answer your question, but possibly provides more clues:
https://play.golang.org/p/s9Xnpcx8Mys
package main
func main() {
var a = "b"
x := a + a // does not escape
x = a + a // does not escape
for i := 0; i < 1; i++ {
x = a + a // a + a escapes to heap
y := a + a // does not escape
println(y)
println(x)
}
}
Only when a variable outside the loop is set inside the loop does it
escape.
On Wednesday, June 23, 2021 at 12:39:17 AM UTC-4 tapi...@gmail.com wrote:
>
> package main
>
> import "testing"
>
> var s33 = []byte{32: 'b'}
>
> var a = string(s33)
>
> func main() {
> x := a + a // a + a does not escape
> println(x)
> }
>
> func Benchmark_e_33(b *testing.B) {
> var x string
> for i := 0; i < b.N; i++ {
> x = a + a // a + a escapes to heap
> }
> println(x)
> }
>
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