From: Matthias Braun <matze@braunis.de>
Date: Mon, 10 Dec 2007 12:38:46 +0000 (+0000)
Subject: fix sc_sub_bits with non 8*x bitsizes
X-Git-Url: http://nsz.repo.hu/git/?a=commitdiff_plain;h=80c11f310875b5129a68db981a6d6b6c5c3996cb;p=libfirm

fix sc_sub_bits with non 8*x bitsizes

[r16929]
---

diff --git a/ir/tv/strcalc.c b/ir/tv/strcalc.c
index 47c947570..06dd22c47 100644
--- a/ir/tv/strcalc.c
+++ b/ir/tv/strcalc.c
@@ -1309,8 +1309,8 @@ unsigned char sc_sub_bits(const void *value, int len, unsigned byte_ofs) {
 		res |= _val(val[nibble_ofs + 1]) << 4;
 
 	/* kick bits outsize */
-	if (len < (int) (8*byte_ofs)) {
-		res &= 0xFF >> (8*byte_ofs - len);
+	if (len - 8 * byte_ofs < 8) {
+		res &= (1 << (len - 8 * byte_ofs)) - 1;
 	}
 	return res;
 }