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https://github.com/golang/go
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b7b44b3173
These can go wrong when one of the operands is the minimum integer value. Fixes #50854. Change-Id: I238fe284f60c7ee5aeb9dc9a18e8b1578cdb77d0 Reviewed-on: https://go-review.googlesource.com/c/go/+/381318 Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: Cherry Mui <cherryyz@google.com> Trust: David Chase <drchase@google.com> Run-TryBot: David Chase <drchase@google.com> TryBot-Result: Gopher Robot <gobot@golang.org>
39 lines
890 B
Go
39 lines
890 B
Go
// run
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// Copyright 2022 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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package main
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// This checks for incorrect application of CMP(-x,y) -> CMN(x,y) in arm and arm64
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//go:noinline
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func f(p int64, x, y int64) bool { return -x <= p && p <= y }
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//go:noinline
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func g(p int32, x, y int32) bool { return -x <= p && p <= y }
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// There are some more complicated patterns involving compares and shifts, try to trigger those.
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//go:noinline
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func h(p int64, x, y int64) bool { return -(x<<1) <= p && p <= y }
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//go:noinline
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func k(p int32, x, y int32) bool { return -(1<<x) <= p && p <= y }
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//go:noinline
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func check(b bool) {
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if b {
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return
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}
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panic("FAILURE")
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}
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func main() {
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check(f(1, -1<<63, 1<<63-1))
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check(g(1, -1<<31, 1<<31-1))
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check(h(1, -1<<62, 1<<63-1))
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check(k(1, 31, 1<<31-1))
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}
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