go issue45242 源码
golang issue45242 代码
文件路径：/test/fixedbugs/issue45242.go
// run
// Copyright 2021 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 "fmt"
//go:noinline
func repro(b []byte, bit int32) {
_ = b[3]
v := uint32(b[0]) | uint32(b[1])<<8 | uint32(b[2])<<16 | uint32(b[3])<<24 | 1<<(bit&31)
b[0] = byte(v)
b[1] = byte(v >> 8)
b[2] = byte(v >> 16)
b[3] = byte(v >> 24)
}
func main() {
var b [8]byte
repro(b[:], 32)
want := [8]byte{1, 0, 0, 0, 0, 0, 0, 0}
if b != want {
panic(fmt.Sprintf("got %v, want %v\n", b, want))
}
}
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