8g: fix opt bug

Was trying to optimize a duplicate float64 move
by registerizing an int64.

Fixes issue 2588.

R=ken2
CC=golang-dev
http://codereview.appspot.com/5645086

1 files changed, 19 insertions, 0 deletions

diff --git a/test/fixedbugs/bug411.go b/test/fixedbugs/bug411.go
new file mode 100644
index 000000000..3ca6a3de2
--- /dev/null
+++ b/test/fixedbugs/bug411.go
@@ -0,0 +1,19 @@
+// $G $D/$F.go
+
+// 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.
+
+// Issue 2588.  Used to trigger internal compiler error on 8g,
+// because the compiler tried to registerize the int64 being
+// used as a memory operand of a int64->float64 move.
+
+package p
+
+func f1(a int64) {
+	f2(float64(a), float64(a))
+}
+
+func f2(a,b float64) {
+}
+