cmd/gc: fix &^ code generation bug
Was not re-walking the new AND node, so that its ullman
count was wrong, so that the code generator attempted to
store values in registers across the call.
Fixes #4752.
R=ken2
CC=golang-dev
https://golang.org/cl/7288054
diff --git a/test/fixedbugs/issue4752.go b/test/fixedbugs/issue4752.go
new file mode 100644
index 0000000..d6781e3
--- /dev/null
+++ b/test/fixedbugs/issue4752.go
@@ -0,0 +1,26 @@
+// run
+
+// 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 F(xi, yi interface{}) uint64 {
+ x, y := xi.(uint64), yi.(uint64)
+ return x &^ y
+}
+
+func G(xi, yi interface{}) uint64 {
+ return xi.(uint64) &^ yi.(uint64) // generates incorrect code
+}
+
+func main() {
+ var x, y uint64 = 0, 1 << 63
+ f := F(x, y)
+ g := G(x, y)
+ if f != 0 || g != 0 {
+ println("F", f, "G", g)
+ panic("bad")
+ }
+}
