mirror of
https://github.com/golang/go
synced 2024-11-25 17:47:57 -07:00
28 lines
492 B
Go
28 lines
492 B
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")
|
||
|
|
}
|
||
|
|
}
|