From: Rémy Oudompheng <oudomphe@phare.normalesup.org>
Date: Tue, 27 Aug 2013 19:09:16 +0000 (+0200)
Subject: cmd/5g: avoid clash between R13 and F3 registers.
X-Git-Tag: go1.2rc2~414
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=4fc7ff497d4133899afed2a3f866d32cb7df5df0;p=gostls13.git

cmd/5g: avoid clash between R13 and F3 registers.

Fixes #6247.

R=golang-dev, lucio.dere, bradfitz
CC=golang-dev
https://golang.org/cl/13216043
---

diff --git a/src/cmd/5g/gg.h b/src/cmd/5g/gg.h
index c0d0393ae2..860817f69e 100644
--- a/src/cmd/5g/gg.h
+++ b/src/cmd/5g/gg.h
@@ -51,7 +51,7 @@ struct	Prog
 
 #define REGALLOC_R0 0
 #define REGALLOC_RMAX REGEXT
-#define REGALLOC_F0 (REGALLOC_RMAX+1)
+#define REGALLOC_F0 NREG
 #define REGALLOC_FMAX (REGALLOC_F0 + FREGEXT)
 
 EXTERN	int32	dynloc;
diff --git a/test/fixedbugs/issue6247.go b/test/fixedbugs/issue6247.go
new file mode 100644
index 0000000000..eea8f9c878
--- /dev/null
+++ b/test/fixedbugs/issue6247.go
@@ -0,0 +1,17 @@
+// compile
+
+// 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.
+
+// Issue 6247: 5g used to be confused by the numbering
+// of floating-point registers.
+
+package main
+
+var p map[string]interface{}
+var v interface{}
+
+func F() {
+	p["hello"] = v.(complex128) * v.(complex128)
+}