Bug#470318: i387 versus SSE versus MPFR (gcc bug)
On 2008-04-17 14:02:17 +0400, Alexei Sheplyakov wrote: I don't think it's a bug. Rather, it's a wrong expectation from the user side. You are comparing results of FP calculation done on 3 different platforms: ix87, sse2, and MPFR, and expect them to be the same. I think your expectation is wrong. I agree with you, the testcase doesn't show any bug, but... That said, I'm not really an expert. Feel free to point out which requirements of IEEE 754 are violated. IEEE 754 allows computations to be performed in an extended precision (this is still true in the current version, IEEE 754-2008). However the long answer is more complex: the C99 language has additional requirements (5.1.2.3#12, 6.3.1.5#2 and 6.3.1.8#2[52]) and bindings (Annex F, when IEEE 754 is claimed to be supported). See upstream bug 323 for more information: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=323 and in particular my comment #125: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=323#c125 Since the incorrect result was obtained *without* optimizations, I suppose that the problem is not due to the GCC bug 323, but is due to double rounding only. So, in this case, as I've said there (in my comment #125), this is a bug in glibc: http://sourceware.org/bugzilla/show_bug.cgi?id=6981 -- Vincent Lefèvre vinc...@vinc17.org - Web: http://www.vinc17.org/ 100% accessible validated (X)HTML - Blog: http://www.vinc17.org/blog/ Work: CR INRIA - computer arithmetic / Arenaire project (LIP, ENS-Lyon) -- To UNSUBSCRIBE, email to debian-gcc-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org
Bug#524472: gcc-4.3: gcc 4.3.2 miscompiles GMP 4.3.0
Package: gcc-4.3
Version: 4.3.2-1.1
Severity: important
Tags: lenny
When I build GMP 4.3.0 with gcc 4.3.2, I get the following errors in
make check:
rootrem.c:338: GNU MP assertion failed: bn = qn
/bin/sh: line 4: 2231 Aborted (core dumped) ${dir}$tst
FAIL: reuse
rootrem.c:338: GNU MP assertion failed: bn = qn
/bin/sh: line 4: 2256 Aborted (core dumped) ${dir}$tst
FAIL: t-root
This is a known bug in GCC 4.3.2 (I don't have any reference for the
moment, but I can ask for more information), that has been fixed in
GCC 4.3.3. I wonder if the patch can be backported to lenny, as such
bugs (compiler bugs which silently lead to incorrect code) can have
nasty effects on software the user or administrator has compiled:
incorrect results, erratic behavior...
-- System Information:
Debian Release: 5.0.1
APT prefers stable
APT policy: (500, 'stable')
Architecture: amd64 (x86_64)
Kernel: Linux 2.6.26-1-amd64 (SMP w/1 CPU core)
Locale: LANG=POSIX, LC_CTYPE=en_US.ISO8859-1 (charmap=ISO-8859-1)
Shell: /bin/sh linked to /bin/bash
Versions of packages gcc-4.3 depends on:
ii binutils2.18.1~cvs20080103-7 The GNU assembler, linker and bina
ii cpp-4.3 4.3.2-1.1The GNU C preprocessor
ii gcc-4.3-base4.3.2-1.1The GNU Compiler Collection (base
ii libc6 2.7-18 GNU C Library: Shared libraries
ii libgcc1 1:4.3.2-1.1 GCC support library
ii libgomp14.3.2-1.1GCC OpenMP (GOMP) support library
Versions of packages gcc-4.3 recommends:
ii libc6-dev 2.7-18 GNU C Library: Development Librari
Versions of packages gcc-4.3 suggests:
pn gcc-4.3-doc none (no description available)
pn gcc-4.3-locales none (no description available)
ii gcc-4.3-multilib 4.3.2-1.1 The GNU C compiler (multilib files
pn libgcc1-dbg none (no description available)
pn libgomp1-dbg none (no description available)
pn libmudflap0-4.3-dev none (no description available)
pn libmudflap0-dbg none (no description available)
-- no debconf information
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Processed: Re: Bug#524424: closed by Daniel Jacobowitz d...@false.org (Re: Bug#524424: gdb: asin produces wrong values)
Processing commands for cont...@bugs.debian.org: reopen 524424 Bug#524424: gdb: asin produces wrong values Bug reopened, originator not changed. reassign 524424 gcc-4.3 Bug#524424: gdb: asin produces wrong values Bug reassigned from package `gdb' to `gcc-4.3'. thanks Stopping processing here. Please contact me if you need assistance. Debian bug tracking system administrator (administrator, Debian Bugs database) -- To UNSUBSCRIBE, email to debian-gcc-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org
Processed: Re: gcc-4.3: gcc 4.3.2 miscompiles GMP 4.3.0
Processing commands for cont...@bugs.debian.org: retitle 524472 gcc-4.3: gcc 4.3.2 strict-aliasing bug / miscompiles GMP 4.3.0 Bug#524472: gcc-4.3: gcc 4.3.2 miscompiles GMP 4.3.0 Changed Bug title to `gcc-4.3: gcc 4.3.2 strict-aliasing bug / miscompiles GMP 4.3.0' from `gcc-4.3: gcc 4.3.2 miscompiles GMP 4.3.0'. thanks Stopping processing here. Please contact me if you need assistance. Debian bug tracking system administrator (administrator, Debian Bugs database) -- To UNSUBSCRIBE, email to debian-gcc-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org
Bug#524472: gcc-4.3: gcc 4.3.2 miscompiles GMP 4.3.0
retitle 524472 gcc-4.3: gcc 4.3.2 strict-aliasing bug / miscompiles GMP 4.3.0
thanks
I've tracked down the bug and managed to write a simple testcase:
/* With GCC 4.3.2 and -O2 option: output value is 1 instead of 0.
* If -fno-strict-aliasing is added, this bug disappears.
*/
#include stdio.h
#include stdlib.h
int test (int n)
{
unsigned long *p, *q;
int i;
q = p = malloc (n * sizeof (unsigned long));
if (p == NULL)
return 2;
for (i = 0; i n - 1; i++)
p[i] = 0;
p[n - 1] = 1;
while ((*(q++))-- == 0) ;
return p[n - 1] == 1;
}
int main (void)
{
int r;
r = test (17);
printf (%d\n, r);
return r;
}
--
Vincent Lefèvre vinc...@vinc17.org - Web: http://www.vinc17.org/
100% accessible validated (X)HTML - Blog: http://www.vinc17.org/blog/
Work: CR INRIA - computer arithmetic / Arenaire project (LIP, ENS-Lyon)
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Re: Bug#524424: closed by Daniel Jacobowitz d...@false.org (Re: Bug#524424: gdb: asin produces wrong values)
reopen 524424 reassign 524424 gcc-4.3 thanks On Thu, Apr 16, 2009 at 08:41:05PM -0700, Jacob Mandelson wrote: Should I file this against gcc or libc then? In concert, this behavior is clearly erroneous. I'll reassign this to GCC - I think that at least the option to output the declarations would be useful. The libc behavior is an implementation detail. -- Daniel Jacobowitz CodeSourcery -- To UNSUBSCRIBE, email to debian-gcc-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org
[Bug target/27263] armv5te-linux-gnueabi-gcc-4.1 fails to compile libquicktime-0.9.7-0.4/plugins/opendivx/encore50/text_code_mb.c
--- Comment #8 from ramana at gcc dot gnu dot org 2009-04-17 16:41 --- As per comment above appears fixed in all release branches today. -- ramana at gcc dot gnu dot org changed: What|Removed |Added Status|NEW |RESOLVED Resolution||FIXED Target Milestone|--- |4.3.4 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27263 --- You are receiving this mail because: --- You are on the CC list for the bug, or are watching someone who is. -- To UNSUBSCRIBE, email to debian-gcc-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org
Results for 4.3.3 (Debian 4.3.3-8) testsuite on alpha-unknown-linux-gnu
LAST_UPDATED: Wed Apr 15 11:09:23 UTC 2009 (revision 146101) Native configuration is alpha-unknown-linux-gnu === libgomp tests === Running target unix WARNING: program timed out. FAIL: libgomp.c/autopar-1.c execution test FAIL: libgomp.fortran/threadprivate3.f90 -O3 -fomit-frame-pointer (internal compiler error) FAIL: libgomp.fortran/threadprivate3.f90 -O3 -fomit-frame-pointer (test for excess errors) UNRESOLVED: libgomp.fortran/threadprivate3.f90 -O3 -fomit-frame-pointer compilation failed to produce executable FAIL: libgomp.fortran/threadprivate3.f90 -O3 -fomit-frame-pointer -funroll-loops (internal compiler error) FAIL: libgomp.fortran/threadprivate3.f90 -O3 -fomit-frame-pointer -funroll-loops (test for excess errors) UNRESOLVED: libgomp.fortran/threadprivate3.f90 -O3 -fomit-frame-pointer -funroll-loops compilation failed to produce executable FAIL: libgomp.fortran/threadprivate3.f90 -O3 -fomit-frame-pointer -funroll-all-loops -finline-functions (internal compiler error) FAIL: libgomp.fortran/threadprivate3.f90 -O3 -fomit-frame-pointer -funroll-all-loops -finline-functions (test for excess errors) UNRESOLVED: libgomp.fortran/threadprivate3.f90 -O3 -fomit-frame-pointer -funroll-all-loops -finline-functions compilation failed to produce executable FAIL: libgomp.fortran/threadprivate3.f90 -O3 -g (internal compiler error) FAIL: libgomp.fortran/threadprivate3.f90 -O3 -g (test for excess errors) UNRESOLVED: libgomp.fortran/threadprivate3.f90 -O3 -g compilation failed to produce executable === libgomp Summary === # of expected passes1754 # of unexpected failures9 # of unresolved testcases 4 === libstdc++ tests === Running target unix XPASS: 26_numerics/headers/cmath/c99_classification_macros_c.cc (test for excess errors) === libstdc++ Summary === # of expected passes4946 # of unexpected successes 1 # of expected failures 59 # of unsupported tests 326 Target: alpha-linux-gnu gcc version 4.3.3 (Debian 4.3.3-8) === g++ tests === Running target unix === g++ Summary === # of expected passes17578 # of expected failures 82 # of unsupported tests 142 /build/buildd-gcc-4.3_4.3.3-8-alpha-HeeUUP/gcc-4.3-4.3.3/build/gcc/testsuite/g++/../../g++ version 4.3.3 (Debian 4.3.3-8) === gcc tests === Running target unix === gcc Summary === # of expected passes46545 # of expected failures 92 # of untested testcases 35 # of unsupported tests 333 /build/buildd-gcc-4.3_4.3.3-8-alpha-HeeUUP/gcc-4.3-4.3.3/build/gcc/xgcc version 4.3.3 (Debian 4.3.3-8) === gfortran tests === Running target unix FAIL: gfortran.dg/boz_9.f90 -O2 execution test FAIL: gfortran.dg/boz_9.f90 -O3 -fomit-frame-pointer execution test FAIL: gfortran.dg/boz_9.f90 -O3 -fomit-frame-pointer -funroll-loops execution test FAIL: gfortran.dg/boz_9.f90 -O3 -fomit-frame-pointer -funroll-all-loops -finline-functions execution test FAIL: gfortran.dg/boz_9.f90 -O3 -g execution test FAIL: gfortran.dg/boz_9.f90 -Os execution test FAIL: gfortran.fortran-torture/execute/intrinsic_nearest.f90 execution, -O2 FAIL: gfortran.fortran-torture/execute/intrinsic_nearest.f90 execution, -O2 -fomit-frame-pointer -finline-functions FAIL: gfortran.fortran-torture/execute/intrinsic_nearest.f90 execution, -O2 -fomit-frame-pointer -finline-functions -funroll-loops FAIL: gfortran.fortran-torture/execute/intrinsic_nearest.f90 execution, -O2 -fbounds-check FAIL: gfortran.fortran-torture/execute/intrinsic_nearest.f90 execution, -O3 -g FAIL: gfortran.fortran-torture/execute/intrinsic_nearest.f90 execution, -Os FAIL: gfortran.fortran-torture/execute/intrinsic_nearest.f90 execution, -O2 -ftree-vectorize -mmax === gfortran Summary === # of expected passes25383 # of unexpected failures13 # of expected failures 3 # of unsupported tests 20 /build/buildd-gcc-4.3_4.3.3-8-alpha-HeeUUP/gcc-4.3-4.3.3/build/gcc/testsuite/gfortran/../../gfortran version 4.3.3 (Debian 4.3.3-8) === obj-c++ tests === Running target unix UNRESOLVED: obj-c++.dg/lookup-2.mm compilation failed to produce executable UNRESOLVED: obj-c++.dg/try-catch-2.mm compilation failed to produce executable UNRESOLVED: obj-c++.dg/try-catch-9.mm compilation failed to produce executable === obj-c++ Summary === # of expected passes423 # of expected failures 23 # of unresolved testcases 3 # of unsupported tests 13 /build/buildd-gcc-4.3_4.3.3-8-alpha-HeeUUP/gcc-4.3-4.3.3/build/gcc/testsuite/obj-c++/../../g++ version 4.3.3 (Debian 4.3.3-8) === objc tests === Running target unix === objc Summary === # of expected passes
Results for 4.3.3 (Debian 4.3.3-8) testsuite on x86_64-pc-linux-gnu
LAST_UPDATED: Wed Apr 15 11:09:23 UTC 2009 (revision 146101) Target: x86_64-linux-gnu gcc version 4.3.3 (Debian 4.3.3-8) Native configuration is x86_64-pc-linux-gnu === g++ tests === Running target unix === g++ Summary for unix === # of expected passes17630 # of expected failures 82 # of unsupported tests 122 Running target unix/-fstack-protector === g++ Summary for unix/-fstack-protector === # of expected passes17630 # of expected failures 82 # of unsupported tests 122 Running target unix/-m32 === g++ Summary for unix/-m32 === # of expected passes17724 # of expected failures 82 # of unsupported tests 89 === g++ Summary === # of expected passes52984 # of expected failures 246 # of unsupported tests 333 /build/buildd/gcc-4.3-4.3.3/build/gcc/testsuite/g++/../../g++ version 4.3.3 (Debian 4.3.3-8) === gcc tests === Running target unix === gcc Summary for unix === # of expected passes49918 # of expected failures 168 # of untested testcases 35 # of unsupported tests 375 Running target unix/-fstack-protector WARNING: program timed out. FAIL: gcc.c-torture/compile/limits-blockid.c -O0 (test for excess errors) === gcc Summary for unix/-fstack-protector === # of expected passes49917 # of unexpected failures1 # of expected failures 168 # of untested testcases 35 # of unsupported tests 375 Running target unix/-m32 === gcc Summary for unix/-m32 === # of expected passes50057 # of expected failures 169 # of untested testcases 35 # of unsupported tests 262 === gcc Summary === # of expected passes149892 # of unexpected failures1 # of expected failures 505 # of untested testcases 105 # of unsupported tests 1012 /build/buildd/gcc-4.3-4.3.3/build/gcc/xgcc version 4.3.3 (Debian 4.3.3-8) === gfortran tests === Running target unix === gfortran Summary for unix === # of expected passes25436 # of expected failures 3 # of unsupported tests 18 Running target unix/-fstack-protector === gfortran Summary for unix/-fstack-protector === # of expected passes25436 # of expected failures 3 # of unsupported tests 18 Running target unix/-m32 === gfortran Summary for unix/-m32 === # of expected passes25438 # of expected failures 3 # of unsupported tests 16 === gfortran Summary === # of expected passes76310 # of expected failures 9 # of unsupported tests 52 /build/buildd/gcc-4.3-4.3.3/build/gcc/testsuite/gfortran/../../gfortran version 4.3.3 (Debian 4.3.3-8) === obj-c++ tests === Running target unix UNRESOLVED: obj-c++.dg/lookup-2.mm compilation failed to produce executable UNRESOLVED: obj-c++.dg/try-catch-2.mm compilation failed to produce executable UNRESOLVED: obj-c++.dg/try-catch-9.mm compilation failed to produce executable === obj-c++ Summary === # of expected passes423 # of expected failures 23 # of unresolved testcases 3 # of unsupported tests 13 /build/buildd/gcc-4.3-4.3.3/build/gcc/testsuite/obj-c++/../../g++ version 4.3.3 (Debian 4.3.3-8) === objc tests === Running target unix === objc Summary === # of expected passes1830 # of expected failures 7 # of unsupported tests 24 /build/buildd/gcc-4.3-4.3.3/build/gcc/xgcc version 4.3.3 (Debian 4.3.3-8) === libgomp tests === Running target unix === libgomp Summary for unix === # of expected passes1763 Running target unix/-fstack-protector === libgomp Summary for unix/-fstack-protector === # of expected passes1763 Running target unix/-m32 === libgomp Summary for unix/-m32 === # of expected passes1763 === libgomp Summary === # of expected passes5289 === libmudflap tests === Running target unix FAIL: libmudflap.c++/pass41-frag.cxx execution test FAIL: libmudflap.c++/pass41-frag.cxx (-static) execution test FAIL: libmudflap.c++/pass41-frag.cxx ( -O) execution test FAIL: libmudflap.c++/pass41-frag.cxx (-O2) execution test FAIL: libmudflap.c++/pass41-frag.cxx (-O3) execution test === libmudflap Summary for unix === # of expected passes1844 # of unexpected failures5 Running target unix/-fstack-protector FAIL: libmudflap.c++/pass41-frag.cxx execution test FAIL:
Results for 4.3.3 (Debian 4.3.3-8) testsuite on i486-pc-linux-gnu
LAST_UPDATED: Wed Apr 15 11:09:23 UTC 2009 (revision 146101) Target: i486-linux-gnu gcc version 4.3.3 (Debian 4.3.3-8) Native configuration is i486-pc-linux-gnu === g++ tests === Running target unix === g++ Summary for unix === # of expected passes17725 # of expected failures 82 # of unsupported tests 88 Running target unix/-fstack-protector === g++ Summary for unix/-fstack-protector === # of expected passes17725 # of expected failures 82 # of unsupported tests 88 Running target unix/-m64 === g++ Summary for unix/-m64 === # of expected passes17630 # of expected failures 82 # of unsupported tests 122 === g++ Summary === # of expected passes53080 # of expected failures 246 # of unsupported tests 298 /scratch/packages/gcc/4.3/gcc-4.3-4.3.3/build/gcc/testsuite/g++/../../g++ version 4.3.3 (Debian 4.3.3-8) === gcc tests === Running target unix === gcc Summary for unix === # of expected passes50052 # of expected failures 169 # of untested testcases 35 # of unsupported tests 264 Running target unix/-fstack-protector FAIL: gcc.c-torture/compile/limits-blockid.c -O0 (internal compiler error) FAIL: gcc.c-torture/compile/limits-blockid.c -O0 (test for excess errors) === gcc Summary for unix/-fstack-protector === # of expected passes50051 # of unexpected failures2 # of expected failures 169 # of untested testcases 35 # of unsupported tests 264 Running target unix/-m64 FAIL: gcc.misc-tests/linkage.c link === gcc Summary for unix/-m64 === # of expected passes49912 # of unexpected failures1 # of expected failures 168 # of untested testcases 35 # of unsupported tests 377 === gcc Summary === # of expected passes150015 # of unexpected failures3 # of expected failures 506 # of untested testcases 105 # of unsupported tests 905 /scratch/packages/gcc/4.3/gcc-4.3-4.3.3/build/gcc/xgcc version 4.3.3 (Debian 4.3.3-8) === gfortran tests === Running target unix === gfortran Summary for unix === # of expected passes25422 # of expected failures 3 # of unsupported tests 24 Running target unix/-fstack-protector === gfortran Summary for unix/-fstack-protector === # of expected passes25422 # of expected failures 3 # of unsupported tests 24 Running target unix/-m64 === gfortran Summary for unix/-m64 === # of expected passes25436 # of expected failures 3 # of unsupported tests 18 === gfortran Summary === # of expected passes76280 # of expected failures 9 # of unsupported tests 66 /scratch/packages/gcc/4.3/gcc-4.3-4.3.3/build/gcc/testsuite/gfortran/../../gfortran version 4.3.3 (Debian 4.3.3-8) === obj-c++ tests === Running target unix UNRESOLVED: obj-c++.dg/lookup-2.mm compilation failed to produce executable UNRESOLVED: obj-c++.dg/try-catch-2.mm compilation failed to produce executable UNRESOLVED: obj-c++.dg/try-catch-9.mm compilation failed to produce executable === obj-c++ Summary === # of expected passes437 # of expected failures 9 # of unresolved testcases 3 # of unsupported tests 13 /scratch/packages/gcc/4.3/gcc-4.3-4.3.3/build/gcc/testsuite/obj-c++/../../g++ version 4.3.3 (Debian 4.3.3-8) === objc tests === Running target unix === objc Summary === # of expected passes1830 # of expected failures 7 # of unsupported tests 24 /scratch/packages/gcc/4.3/gcc-4.3-4.3.3/build/gcc/xgcc version 4.3.3 (Debian 4.3.3-8) === libgomp tests === Running target unix WARNING: program timed out. FAIL: libgomp.fortran/do2.f90 -O0 execution test WARNING: program timed out. FAIL: libgomp.fortran/do2.f90 -O1 execution test WARNING: program timed out. FAIL: libgomp.fortran/do2.f90 -O2 execution test WARNING: program timed out. FAIL: libgomp.fortran/do2.f90 -O3 -fomit-frame-pointer execution test WARNING: program timed out. FAIL: libgomp.fortran/do2.f90 -O3 -fomit-frame-pointer -funroll-loops execution test WARNING: program timed out. FAIL: libgomp.fortran/do2.f90 -O3 -fomit-frame-pointer -funroll-all-loops -finline-functions execution test WARNING: program timed out. FAIL: libgomp.fortran/do2.f90 -O3 -g execution test WARNING: program timed out. FAIL: libgomp.fortran/do2.f90 -Os execution test === libgomp Summary for unix === # of expected passes1755 # of
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