go issue27829 源码
golang issue27829 代码
文件路径：/test/fixedbugs/issue27829.go
// run
// 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.
// Bad AND/BTR combination rule.
package main
import "fmt"
//go:noinline
func f(x uint64) uint64 {
return (x >> 48) &^ (uint64(0x4000))
}
func main() {
bad := false
if got, want := f(^uint64(0)), uint64(0xbfff); got != want {
fmt.Printf("got %x, want %x\n", got, want)
bad = true
}
if bad {
panic("bad")
}
}
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