| // run | |
| //go:build amd64p32 | |
| // Copyright 2018 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 | |
| import ( | |
| "bytes" | |
| "fmt" | |
| "unsafe" | |
| ) | |
| func main() { | |
| b := make([]byte, 128) | |
| for i := range b { | |
| b[i] = 1 | |
| } | |
| if bytes.IndexByte(b, 0) != -1 { | |
| panic("found 0") | |
| } | |
| for i := range b { | |
| b[i] = 0 | |
| c := b | |
| *(*int)(unsafe.Pointer(uintptr(unsafe.Pointer(&c)) + unsafe.Sizeof(uintptr(0)))) = 1<<31 - 1 | |
| if bytes.IndexByte(c, 0) != i { | |
| panic(fmt.Sprintf("missing 0 at %d\n", i)) | |
| } | |
| b[i] = 1 | |
| } | |
| } |