| // 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" | |
| func f(x uint64) uint64 { | |
| s := "\x04" | |
| c := s[0] | |
| return x - x<<c<<4 | |
| } | |
| func g(x uint32) uint32 { | |
| s := "\x04" | |
| c := s[0] | |
| return x - x<<c<<4 | |
| } | |
| func main() { | |
| if want, got := uint64(0xffffffffffffff01), f(1); want != got { | |
| panic(fmt.Sprintf("want %x got %x", want, got)) | |
| } | |
| if want, got := uint32(0xffffff01), g(1); want != got { | |
| panic(fmt.Sprintf("want %x got %x", want, got)) | |
| } | |
| } |