go issue50854 源码
golang issue50854 代码
文件路径：/test/fixedbugs/issue50854.go
// run
// Copyright 2022 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
// This checks for incorrect application of CMP(-x,y) -> CMN(x,y) in arm and arm64
//go:noinline
func f(p int64, x, y int64) bool { return -x <= p && p <= y }
//go:noinline
func g(p int32, x, y int32) bool { return -x <= p && p <= y }
// There are some more complicated patterns involving compares and shifts, try to trigger those.
//go:noinline
func h(p int64, x, y int64) bool { return -(x<<1) <= p && p <= y }
//go:noinline
func k(p int32, x, y int32) bool { return -(1<<x) <= p && p <= y }
//go:noinline
func check(b bool) {
if b {
return
}
panic("FAILURE")
}
func main() {
check(f(1, -1<<63, 1<<63-1))
check(g(1, -1<<31, 1<<31-1))
check(h(1, -1<<62, 1<<63-1))
check(k(1, 31, 1<<31-1))
}
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