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