[go-nuts] about the []byte -> string comversion optimization, is it some weird?

[T L]

package main

import "fmt"
import "testing"

var s string
var a = make([]byte, 1000)

func f0() {
    x := string(a)
    s =     x + x + x + 
        x + x + x + 
        x + x + x + 
        x
}

func f1() {
    s =     string(a) +  string(a) + string(a) +
           string(a) +  string(a) + string(a) +
           string(a) +  string(a) + string(a) +
           string(a)
}

func f2() {
    s =     (" " +
           string(a) +  string(a) + string(a) +
           string(a) +  string(a) + string(a) +
           string(a) +  string(a) + string(a) +
           string(a) )[1:]
}

func main() {
    fmt.Println(testing.AllocsPerRun(1, f0)) // 2
    fmt.Println(testing.AllocsPerRun(1, f1)) // 11
    fmt.Println(testing.AllocsPerRun(1, f2)) // 1
}

why doesn't gc make optimization for f1?

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