1 // run 2 3 // Copyright 2015 The Go Authors. All rights reserved. 4 // Use of this source code is governed by a BSD-style 5 // license that can be found in the LICENSE file. 6 7 package main 8 9 // Make sure the compiler knows that DUFFCOPY clobbers X0 10 11 import "fmt" 12 13 //go:noinline 14 func f(x float64) float64 { 15 // y is allocated to X0 16 y := x + 5 17 // marshals z before y. Marshaling z 18 // calls DUFFCOPY. 19 return g(z, y) 20 } 21 22 //go:noinline 23 func g(b [64]byte, y float64) float64 { 24 return y 25 } 26 27 var z [64]byte 28 29 func main() { 30 got := f(5) 31 if got != 10 { 32 panic(fmt.Sprintf("want 10, got %f", got)) 33 } 34 } 35
