From: Shenghou Ma <minux.ma@gmail.com>
Date: Mon, 16 Dec 2013 21:54:10 +0000 (-0500)
Subject: cmd/gc: fix comparison order of parameters in mpcmpfltc(a, b)
X-Git-Tag: go1.3beta1~1216
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=f85ba7d50a7df5a978a259a3e06bc30af1bbd5df;p=gostls13.git

cmd/gc: fix comparison order of parameters in mpcmpfltc(a, b)
It should compare a - b to 0, not b - a to 0.
Fixes #6964.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/39020044
---

diff --git a/src/cmd/gc/mparith1.c b/src/cmd/gc/mparith1.c
index e25044a8be..41412c416d 100644
--- a/src/cmd/gc/mparith1.c
+++ b/src/cmd/gc/mparith1.c
@@ -65,7 +65,7 @@ mpcmpfltc(Mpflt *b, double c)
 	Mpflt a;
 
 	mpmovecflt(&a, c);
-	return mpcmpfltflt(&a, b);
+	return mpcmpfltflt(b, &a);
 }
 
 void
diff --git a/test/fixedbugs/issue6964.go b/test/fixedbugs/issue6964.go
new file mode 100644
index 0000000000..821735c082
--- /dev/null
+++ b/test/fixedbugs/issue6964.go
@@ -0,0 +1,11 @@
+// errorcheck
+
+// Copyright 2013 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() {
+	_ = string(-4 + 2i + 2) // ERROR "-4\+2i"
+}