diff options
author | Keith Randall <khr@golang.org> | 2021-09-19 14:20:56 -0700 |
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committer | Dmitri Shuralyov <dmitshur@golang.org> | 2021-10-27 20:42:13 +0000 |
commit | cfe182c67328f852d33ff00c9dc876765f19e546 (patch) | |
tree | 5838169486f96b1683bb74aaf8171f74b4b254c6 /test | |
parent | c580180744e60d6c84fc0b59d634fcff01290780 (diff) | |
download | go-cfe182c67328f852d33ff00c9dc876765f19e546.tar.gz go-cfe182c67328f852d33ff00c9dc876765f19e546.zip |
[release-branch.go1.16] cmd/compile: fix simplification rules on arm/arm64
Fixes #48474
Change-Id: Ic1e918f916eae223a3b530a51a58f03031924670
Reviewed-on: https://go-review.googlesource.com/c/go/+/350913
Trust: Keith Randall <khr@golang.org>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-on: https://go-review.googlesource.com/c/go/+/351072
Reviewed-by: Austin Clements <austin@google.com>
Diffstat (limited to 'test')
-rw-r--r-- | test/fixedbugs/issue48473.go | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/test/fixedbugs/issue48473.go b/test/fixedbugs/issue48473.go new file mode 100644 index 0000000000..8edef1f14f --- /dev/null +++ b/test/fixedbugs/issue48473.go @@ -0,0 +1,30 @@ +// run + +// Copyright 2021 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 + +import "fmt" + +func f(x uint64) uint64 { + s := "\x04" + c := s[0] + return x - x<<c<<4 +} + +func g(x uint32) uint32 { + s := "\x04" + c := s[0] + return x - x<<c<<4 +} + +func main() { + if want, got := uint64(0xffffffffffffff01), f(1); want != got { + panic(fmt.Sprintf("want %x got %x", want, got)) + } + if want, got := uint32(0xffffff01), g(1); want != got { + panic(fmt.Sprintf("want %x got %x", want, got)) + } +} |