From: Ken Thompson <ken@golang.org>
Date: Fri, 22 Oct 2010 01:15:00 +0000 (-0700)
Subject: bug right shifting 64 bits
X-Git-Tag: weekly.2010-10-27~48
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=e5bd12ea90bd5a5727f51ade05c87962ca390670;p=gostls13.git

bug right shifting 64 bits
by a variable that equals 32

R=rsc
CC=golang-dev
https://golang.org/cl/2645042
---

diff --git a/src/cmd/5g/cgen64.c b/src/cmd/5g/cgen64.c
index a22f4a548c..716ec5ed5b 100644
--- a/src/cmd/5g/cgen64.c
+++ b/src/cmd/5g/cgen64.c
@@ -439,12 +439,12 @@ olsh_break:
 		p3 = gbranch(ABLO, T);
 
 		// shift == 32
+		p1 = gins(AMOVW, &bh, &al);
+		p1->scond = C_SCOND_EQ;
 		if(bh.type->etype == TINT32)
 			p1 = gshift(AMOVW, &bh, SHIFT_AR, 31, &ah);
 		else
-			p1 = gins(AEOR, &al, &al);
-		p1->scond = C_SCOND_EQ;
-		p1 = gins(AMOVW, &bh, &al);
+			p1 = gins(AEOR, &ah, &ah);
 		p1->scond = C_SCOND_EQ;
 		p4 = gbranch(ABEQ, T);