From: Daniel Morsing <daniel.morsing@gmail.com>
Date: Fri, 11 Jan 2013 14:44:42 +0000 (+0100)
Subject: cmd/6g, cmd/8g: Allow optimization of return registers.
X-Git-Tag: go1.1rc2~1418
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=b73a1a8e32ed4f394299a9fec5cfb53e963f6c08;p=gostls13.git

cmd/6g, cmd/8g: Allow optimization of return registers.

The peephole optimizer would keep hands off AX and X0 during returns, even though go doesn't return through registers.

R=dave, rsc
CC=golang-dev
https://golang.org/cl/7030046
---

diff --git a/src/cmd/6g/peep.c b/src/cmd/6g/peep.c
index 231ce5314a..9b6278792a 100644
--- a/src/cmd/6g/peep.c
+++ b/src/cmd/6g/peep.c
@@ -1157,8 +1157,6 @@ copyu(Prog *p, Adr *v, Adr *s)
 		return 0;
 
 	case ARET:	/* funny */
-		if(v->type == REGRET || v->type == FREGRET)
-			return 2;
 		if(s != A)
 			return 1;
 		return 3;
diff --git a/src/cmd/8g/peep.c b/src/cmd/8g/peep.c
index 4fe8986cb6..3a61e528dc 100644
--- a/src/cmd/8g/peep.c
+++ b/src/cmd/8g/peep.c
@@ -886,8 +886,6 @@ copyu(Prog *p, Adr *v, Adr *s)
 		return 0;
 
 	case ARET:	/* funny */
-		if(v->type == REGRET || v->type == FREGRET)
-			return 2;
 		if(s != A)
 			return 1;
 		return 3;