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go/test/fixedbugs/issue26426.go
Keith Randall 59d0baeb33 cmd/compile: add test for OPmodify ops clobbering flags
Code fix was in CL 122556.  This is a corresponding test case.

Fixes #26426

Change-Id: Ib8769f367aed8bead029da0a8d2ddccee1d1dccb
Reviewed-on: https://go-review.googlesource.com/124535
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2018-07-19 16:24:53 +00:00

30 lines
499 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
//go:noinline
func f(p *int, v int, q1, q2 *int, r *bool) {
x := *r
if x {
*q1 = 1
}
*p = *p + v // This must clobber flags. Otherwise we keep x in a flags register.
if x {
*q2 = 1
}
}
func main() {
var p int
var q1, q2 int
var b bool
f(&p, 1, &q1, &q2, &b)
if q1 != 0 || q2 != 0 {
panic("bad")
}
}