cmd/gc: fix LEAQ $0, SI bug

Cannot take effective address of constant.

Fixes issue 3670.

R=ken2
CC=golang-dev
http://codereview.appspot.com/6299055

1 files changed, 19 insertions, 0 deletions

diff --git a/test/fixedbugs/bug444.go b/test/fixedbugs/bug444.go
new file mode 100644
index 000000000..0bbd16fae
--- /dev/null
+++ b/test/fixedbugs/bug444.go
@@ -0,0 +1,19 @@
+// run
+
+// Copyright 2012 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.
+
+// The no-op conversion here used to confuse the compiler
+// into doing a load-effective-address of nil.
+
+package main
+
+import "reflect"
+
+type T interface {}
+
+func main() {
+        reflect.TypeOf(nil)
+        reflect.TypeOf(T(nil)) // used to fail
+}