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https://github.com/golang/go
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28 lines
492 B
Go
28 lines
492 B
Go
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// run
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// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Bad AND/BTR combination rule.
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package main
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import "fmt"
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//go:noinline
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func f(x uint64) uint64 {
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return (x >> 48) &^ (uint64(0x4000))
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}
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func main() {
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bad := false
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if got, want := f(^uint64(0)), uint64(0xbfff); got != want {
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fmt.Printf("got %x, want %x\n", got, want)
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bad = true
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}
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if bad {
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panic("bad")
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}
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}
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