Bug#153762: marked as done (libc6: Broken __moddi3 implementation)
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and subject line Close bugs tagged as woody
has caused the attached Bug report to be marked as done.
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Subject: libc6: Broken __moddi3 implementation
From: "Juergen Kreileder" <jk@blackdown.de>
To: "Debian Bug Tracking System" <submit@bugs.debian.org>
X-Mailer: reportbug 1.99.47
Date: Sun, 21 Jul 2002 20:19:35 +0200
Message-Id: <E17WLIt-0002FF-00@marvin.blackdown.de>
Delivered-To: submit@bugs.debian.org
Package: libc6
Version: 2.2.5-12
Severity: important
Tags: patch
__moddi3 returns results with wrong sign if the second argument is
negative:
Example:
,----[ modtest.c ]
| #include <stdio.h>
| typedef long long s8;
| void printMod(s8 a, s8 b)
| {
| printf("%lld %% %lld = %lld\n", a, b, a%b);
| }
| int main(void)
| {
| printMod(-10L, -7L);
| printMod(-10L, 7L);
| printMod(10L, -7L);
| printMod(10L, 7L);
| return 0;
| }
`----
gcc -o modtest_good modtest.c
gcc -o modtest_bad modtest.c -lc
Output of modtest_good: (correct)
-10 % -7 = -3
-10 % 7 = -3
10 % -7 = 3
10 % 7 = 3
Output of modtest_bad: (incorrect)
-10 % -7 = 3
-10 % 7 = -3
10 % -7 = -3
10 % 7 = 3
libc6 in woody has the same problem.
Here's a patch from upstream (glibc-2-2-branch) which fixes the problem:
http://sources.redhat.com/cgi-bin/cvsweb.cgi/libc/sysdeps/wordsize-32/divdi3.c.diff?r1=1.1.2.1&r2=1.1.2.2&cvsroot=glibc
--- libc/sysdeps/wordsize-32/divdi3.c 2002/02/28 19:38:59 1.1.2.1
+++ libc/sysdeps/wordsize-32/divdi3.c 2002/05/30 23:59:11 1.1.2.2
@@ -301,10 +301,7 @@
u = -u;
}
if (v < 0)
- {
- c = ~c;
- v = -v;
- }
+ v = -v;
__udivmoddi4 (u, v, &w);
if (c)
w = -w;
-- System Information:
Debian Release: testing/unstable
Architecture: i386
Kernel: Linux marvin 2.4.19-rc1-ac2 #1 SMP Fri Jul 12 18:44:39 CEST 2002 i686
Locale: LANG=en_US, LC_CTYPE=en_US
-- no debconf information
---------------------------------------
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Date: Fri, 05 Aug 2005 19:15:42 +0900
Message-ID: <[🔎] 81psssu1td.wl%gotom@debian.or.jp>
From: GOTO Masanori <gotom@debian.org>
To: 153263-done@bugs.debian.org, 121396-done@bugs.debian.org,
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debian-glibc@lists.debian.org
Subject: Close bugs tagged as woody
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These bugs are tagged as woody, because they're well-known problems
and for keeping open to come to light what the problem is. However,
as you know, sarge was released. Our stable version was moved from
woody to sarge. It's high time to close old woody's bugs that are
still open. Now I close these bugs. If you have any objections to
close them, please reopen and let us know your trouble.
Regards,
-- gotom
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