| // 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)) | |
| } | |
| } |