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From: "laurent at guerby dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ada/24003] [4.1 Regression] ACATS FAIL 17 regressions on x86-linux, fixed and decimal arithmetic broken
Date: Sun, 02 Oct 2005 16:20:00 -0000 [thread overview]
Message-ID: <20051002162010.11494.qmail@sourceware.org> (raw)
In-Reply-To: <bug-24003-7210@http.gcc.gnu.org/bugzilla/>
------- Comment #10 from laurent at guerby dot net 2005-10-02 16:20 -------
It looks like it is indeed a codegen bug in s-arit64.adb, in Scaled_Divide the
following line is miscompiled at -O1 and above (works at -O0):
T2 := Lo (T1 rem Zlo) & D (4);
In my p.adb testcase, the compiler with Jan patch calls Lo with argument = 0
whereas (T1 rem Zlo) returned (1073741824 rem 3221225472) = 1073741824 so
stack/argument handling must be confused at some point.
The bug is volatile, ie replacing the line above by:
S3 := Lo (T1 rem Zlo);
if S3 = 0 then
T2 := Uns64 (D (4));
else
T2 := S3 & D (4);
end if;
Makes it go away.
Laurent
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24003
next parent reply other threads:[~2005-10-02 16:20 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <bug-24003-7210@http.gcc.gnu.org/bugzilla/>
2005-10-02 16:20 ` laurent at guerby dot net [this message]
2005-10-02 21:46 ` hubicka at ucw dot cz
2005-10-02 21:55 ` ebotcazou at gcc dot gnu dot org
2005-10-02 22:30 ` hubicka at ucw dot cz
2005-10-03 3:37 ` laurent at guerby dot net
2005-10-05 20:08 ` [Bug middle-end/24003] " laurent at guerby dot net
2005-10-22 21:58 ` pinskia at gcc dot gnu dot org
2005-10-24 16:33 ` ebotcazou at gcc dot gnu dot org
2005-10-24 19:37 ` laurent at guerby dot net
2005-10-24 21:05 ` ebotcazou at gcc dot gnu dot org
2005-10-24 21:31 ` laurent at guerby dot net
2005-10-25 9:26 ` ebotcazou at gcc dot gnu dot org
2005-10-25 15:33 ` ebotcazou at gcc dot gnu dot org
2005-10-31 5:52 ` [Bug middle-end/24003] [4.1 Regression] 17 ACATS regressions (fixed point or decimal artihmetic) mmitchel at gcc dot gnu dot org
2005-11-11 7:43 ` ebotcazou at gcc dot gnu dot org
2005-11-11 7:44 ` ebotcazou at gcc dot gnu dot org
2005-11-13 9:55 ` ebotcazou at gcc dot gnu dot org
2005-11-13 9:57 ` ebotcazou at gcc dot gnu dot org
2005-09-21 17:31 [Bug ada/24003] New: ACATS FAIL 17 regressions on x86-linux, fixed and decimal arithmetic broken laurent at guerby dot net
2005-09-21 20:26 ` [Bug ada/24003] [4.1 Regression] " laurent at guerby dot net
2005-09-23 17:33 ` laurent at guerby dot net
2005-09-23 19:44 ` pinskia at gcc dot gnu dot org
2005-09-23 19:46 ` laurent at guerby dot net
2005-09-27 22:22 ` hubicka at ucw dot cz
2005-09-29 21:08 ` laurent at guerby dot net
2005-09-29 21:16 ` christian dot joensson at gmail dot com
2005-10-01 15:46 ` hubicka at gcc dot gnu dot org
2005-10-01 16:04 ` laurent at guerby dot net
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