From 8f8640a057f813e0238b6d3a77643ac07b52f56b Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@golang.org>
Date: Mon, 21 May 2012 12:59:26 -0400
Subject: [PATCH] cmd/6g: allow use of R14, R15 now

We stopped reserving them in 2009 or so.

R=ken
CC=golang-dev
https://golang.org/cl/6215061
---
 src/cmd/6g/reg.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/cmd/6g/reg.c b/src/cmd/6g/reg.c
index e8259c476d..d68625bfff 100644
--- a/src/cmd/6g/reg.c
+++ b/src/cmd/6g/reg.c
@@ -164,7 +164,7 @@ regopt(Prog *firstp)
 
 	if(first) {
 		fmtinstall('Q', Qconv);
-		exregoffset = D_R13;	// R14,R15 are external
+		exregoffset = D_R15;
 		first = 0;
 	}
 
@@ -1577,7 +1577,7 @@ RtoB(int r)
 int
 BtoR(int32 b)
 {
-	b &= 0x3fffL;		// no R14 or R15
+	b &= 0xffffL;
 	if(b == 0)
 		return 0;
 	return bitno(b) + D_AX;