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go/test/fixedbugs/issue23719.go
Keith Randall 23e8e197b0 cmd/compile: use unsigned loads for multi-element comparisons
When loading multiple elements of an array into a single register,
make sure we treat them as unsigned.  When treated as signed, the
upper bits might all be set, causing the shift-or combo to clobber
the values higher in the register.

Fixes #23719.

Change-Id: Ic87da03e9bd0fe2c60bb214b99f846e4e9446052
Reviewed-on: https://go-review.googlesource.com/92335
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ilya Tocar <ilya.tocar@intel.com>
2018-02-06 18:24:33 +00:00

43 lines
826 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.
package main
func main() {
v1 := [2]int32{-1, 88}
v2 := [2]int32{-1, 99}
if v1 == v2 {
panic("bad comparison")
}
w1 := [2]int16{-1, 88}
w2 := [2]int16{-1, 99}
if w1 == w2 {
panic("bad comparison")
}
x1 := [4]int16{-1, 88, 88, 88}
x2 := [4]int16{-1, 99, 99, 99}
if x1 == x2 {
panic("bad comparison")
}
a1 := [2]int8{-1, 88}
a2 := [2]int8{-1, 99}
if a1 == a2 {
panic("bad comparison")
}
b1 := [4]int8{-1, 88, 88, 88}
b2 := [4]int8{-1, 99, 99, 99}
if b1 == b2 {
panic("bad comparison")
}
c1 := [8]int8{-1, 88, 88, 88, 88, 88, 88, 88}
c2 := [8]int8{-1, 99, 99, 99, 99, 99, 99, 99}
if c1 == c2 {
panic("bad comparison")
}
}