From: Shenghou Ma <minux.ma@gmail.com>
Date: Tue, 31 Jan 2012 15:59:34 +0000 (-0500)
Subject: 5l: optimize the common case in patch()
X-Git-Tag: weekly.2012-02-07~180
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=2d64bab1ded3c17d1e73ee1dcacf1aafae223317;p=gostls13.git

5l: optimize the common case in patch()
    If p->to.sym->text is non-nil, then no need to search for sym->value.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5601046
---

diff --git a/src/cmd/5l/pass.c b/src/cmd/5l/pass.c
index c430494597..0f2afbd850 100644
--- a/src/cmd/5l/pass.c
+++ b/src/cmd/5l/pass.c
@@ -213,6 +213,8 @@ patch(void)
 			if((a == ABL || a == ABX || a == AB || a == ARET) &&
 			   p->to.type != D_BRANCH && p->to.sym != S) {
 				s = p->to.sym;
+				if(s->text == nil)
+					continue;
 				switch(s->type) {
 				default:
 					diag("undefined: %s", s->name);
@@ -222,7 +224,8 @@ patch(void)
 				case STEXT:
 					p->to.offset = s->value;
 					p->to.type = D_BRANCH;
-					break;
+					p->cond = s->text;
+					continue;
 				}
 			}
 			if(p->to.type != D_BRANCH)