// 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)) } }