go issue13171 源码
golang issue13171 代码
文件路径：/test/fixedbugs/issue13171.go
// run
// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
// Make sure the compiler knows that DUFFCOPY clobbers X0
import "fmt"
//go:noinline
func f(x float64) float64 {
// y is allocated to X0
y := x + 5
// marshals z before y. Marshaling z
// calls DUFFCOPY.
return g(z, y)
}
//go:noinline
func g(b [64]byte, y float64) float64 {
return y
}
var z [64]byte
func main() {
got := f(5)
if got != 10 {
panic(fmt.Sprintf("want 10, got %f", got))
}
}
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