1// run
2
3// Copyright 2021 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
7package main
8
9import "fmt"
10
11//go:noinline
12func repro(b []byte, bit int32) {
13	_ = b[3]
14	v := uint32(b[0]) | uint32(b[1])<<8 | uint32(b[2])<<16 | uint32(b[3])<<24 | 1<<(bit&31)
15	b[0] = byte(v)
16	b[1] = byte(v >> 8)
17	b[2] = byte(v >> 16)
18	b[3] = byte(v >> 24)
19}
20
21func main() {
22	var b [8]byte
23	repro(b[:], 32)
24	want := [8]byte{1, 0, 0, 0, 0, 0, 0, 0}
25	if b != want {
26		panic(fmt.Sprintf("got %v, want %v\n", b, want))
27	}
28}
29