From: Dave Cheney <dave@cheney.net>
Date: Mon, 8 Sep 2014 06:06:41 +0000 (+1000)
Subject: cmd/cc: fix undefined behaviour warning in bv.c
X-Git-Tag: go1.4beta1~484
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=4a40fb197931a23c11ff4d677ecee6aefd99d5ca;p=gostls13.git

cmd/cc: fix undefined behaviour warning in bv.c

Fixes warning

# _/home/dfc/go/misc/cgo/test/backdoor
/home/dfc/go/src/cmd/cc/bv.c:43:11: runtime error: left shift of 1 by 31 places cannot be represented in type 'int'

LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/136330043
---

diff --git a/src/cmd/cc/bv.c b/src/cmd/cc/bv.c
index 51b7f4076f..db433de6a7 100644
--- a/src/cmd/cc/bv.c
+++ b/src/cmd/cc/bv.c
@@ -40,6 +40,6 @@ bvset(Bvec *bv, int32 i)
 
 	if(i < 0 || i >= bv->n)
 		fatal(Z, "bvset: index %d is out of bounds with length %d\n", i, bv->n);
-	mask = 1 << (i % WORDBITS);
+	mask = 1UL << (i % WORDBITS);
 	bv->b[i / WORDBITS] |= mask;
 }