| // 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 |
| } |
| } |
