From: Rémy Oudompheng <oudomphe@phare.normalesup.org>
Date: Fri, 13 Apr 2012 08:12:31 +0000 (+0200)
Subject: cmd/6g: restore magic multiply for /=, %=.
X-Git-Tag: go1.1rc2~3384
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=061061e77c255202d01087e72fc3c370d2e21bdb;p=gostls13.git

cmd/6g: restore magic multiply for /=, %=.

Also enables turning /= 2 in a right shift.

Part of issue 2230.

R=rsc
CC=golang-dev, remy
https://golang.org/cl/6012049
---

diff --git a/src/cmd/6g/ggen.c b/src/cmd/6g/ggen.c
index 02e67d6d41..434ee32e35 100644
--- a/src/cmd/6g/ggen.c
+++ b/src/cmd/6g/ggen.c
@@ -389,7 +389,9 @@ cgen_asop(Node *n)
 hard:
 	n2.op = 0;
 	n1.op = 0;
-	if(nr->ullman >= nl->ullman || nl->addable) {
+	if(nr->op == OLITERAL) {
+		// don't allocate a register for literals.
+	} else if(nr->ullman >= nl->ullman || nl->addable) {
 		regalloc(&n2, nr->type, N);
 		cgen(nr, &n2);
 		nr = &n2;