From: Russ Cox <rsc@golang.org>
Date: Wed, 23 Feb 2011 18:21:39 +0000 (-0500)
Subject: 5g: fix optimizer bug
X-Git-Tag: weekly.2011-02-24~22
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=63c24081a09a363735797097bf238a7c78d15fd7;p=gostls13.git

5g: fix optimizer bug

same as in issue below, never fixed on ARM

changeset:   5498:3fa1372ca694
user:        Ken Thompson <ken@golang.org>
date:        Thu May 20 17:31:28 2010 -0700

description:
fix issue 798
cannot allocate an audomatic temp
while real registers are allocated.
there is a chance that the automatic
will be allocated to one of the
allocated registers. the fix is to
not registerize such variables.

R=rsc
CC=golang-dev
https://golang.org/cl/1202042

R=ken2
CC=golang-dev
https://golang.org/cl/4226042
---

diff --git a/src/cmd/5g/gg.h b/src/cmd/5g/gg.h
index 603c09fc8a..ce4575be95 100644
--- a/src/cmd/5g/gg.h
+++ b/src/cmd/5g/gg.h
@@ -27,6 +27,7 @@ struct	Addr
 	uchar	type;
 	char	name;
 	char	reg;
+	char pun;
 	uchar	etype;
 };
 #define	A	((Addr*)0)
diff --git a/src/cmd/5g/gsubr.c b/src/cmd/5g/gsubr.c
index 133a21b3e8..83a9949d6c 100644
--- a/src/cmd/5g/gsubr.c
+++ b/src/cmd/5g/gsubr.c
@@ -1168,6 +1168,7 @@ naddr(Node *n, Addr *a, int canemitcode)
 			a->etype = simtype[n->type->etype];
 			a->width = n->type->width;
 		}
+		a->pun = n->pun;
 		a->offset = n->xoffset;
 		a->sym = n->sym;
 		if(a->sym == S)
diff --git a/src/cmd/5g/reg.c b/src/cmd/5g/reg.c
index f31f70535e..1cbeb3e3de 100644
--- a/src/cmd/5g/reg.c
+++ b/src/cmd/5g/reg.c
@@ -697,8 +697,8 @@ mkvar(Reg *r, Adr *a)
 	n = D_NONE;
 
 	flag = 0;
-//	if(a->pun)
-//		flag = 1;
+	if(a->pun)
+		flag = 1;
 
 	switch(t) {
 	default: