[Bug middle-end/28752] bootstrap comparision fails with -ftree-vectorize -maltivec on ppc and i386
--- Comment #32 from irar at il dot ibm dot com 2006-12-11 12:46 --- I am attaching the bad rs6000.s (generated with vectorization) and good rs6000.s (generated with vectorization and -fno-move-loop-invariants) using revision 110852 (from February 2006). I looked over these a bit, but I wouldn't like to hunt down a bug that had since been solved, so I think I'll switch to looking into more recent snapshots. Ira -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28752
[Bug middle-end/28752] bootstrap comparision fails with -ftree-vectorize -maltivec on ppc and i386
--- Comment #33 from irar at il dot ibm dot com 2006-12-11 12:57 --- Created an attachment (id=12779) -- (http://gcc.gnu.org/bugzilla/attachment.cgi?id=12779action=view) Bad rs6000.s -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28752
[Bug middle-end/28752] bootstrap comparision fails with -ftree-vectorize -maltivec on ppc and i386
--- Comment #34 from irar at il dot ibm dot com 2006-12-11 13:02 --- Created an attachment (id=12781) -- (http://gcc.gnu.org/bugzilla/attachment.cgi?id=12781action=view) Good rs6000.s -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28752
[Bug middle-end/28752] bootstrap comparision fails with -ftree-vectorize -maltivec on ppc and i386
--- Comment #30 from irar at il dot ibm dot com 2006-12-07 12:14 --- I am testing a patch for x86 boostrap failure. It was caused by a bug in vectorization of strided accesses analysis, and, therefore, has nothing to do with the bootstrap failures on ppc. Ira -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28752
[Bug middle-end/28752] bootstrap comparision fails with -ftree-vectorize -maltivec on ppc and i386
--- Comment #31 from irar at il dot ibm dot com 2006-12-07 13:30 --- (In reply to comment #17) I applied the patch http://gcc.gnu.org/ml/gcc-patches/2006-07/msg01043.html (a fix for PR26197). The bootstrap with vectorization passes! However, the failure in comment #3 still occurs in the later revisions. So, I am going to hunt for a later patch that broke bootstrap with vectorization (applying the above patch). I found this patch: http://gcc.gnu.org/viewcvs?view=revrevision=110852 The offending loop here is rs6000.c:17088. If I disable -fmove-loop-invariants on r110852, bootstrap with vectorization enabled passes. Ira -- irar at il dot ibm dot com changed: What|Removed |Added CC||rakdver at atrey dot karlin ||dot mff dot cuni dot cz http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28752
[Bug middle-end/28752] bootstrap comparision fails with -ftree-vectorize -maltivec on ppc and i386
--- Comment #29 from irar at il dot ibm dot com 2006-12-04 09:24 --- I reproduced the wrong printings on x86. It seems to be a problem in strided access vectorization after all - no stores are generated. I am looking into this. Thanks, Ira -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28752
[Bug middle-end/28752] bootstrap comparision fails with -ftree-vectorize -maltivec on ppc and i386
--- Comment #28 from volodyan at gmail dot com 2006-12-02 17:46 ---
(In reply to comment #27)
I committed the patch that enables vectorization of strided accesses
Confirmed the bug on gcc-4.3/(Pentium-M)X86. Configured as
../gcc/configure --enable-bootstrap --enable-languages=c
and built as
make BOOT_CFLAGS=-g -msse2 -ftree-vectorize -O2
Bootstrap failed after wrong execution of the following loop from
cfgloopanal.c/dfs:
printf(nvert= %d, nq in dfs=%d, post0=%d\n,g-n_vertices, nq,
g-vertices[0].post);
for (i = 0; i g-n_vertices; i++)
{
g-vertices[i].component = -1;
g-vertices[i].post = -1;
}
printf(post0=%d; i in dfs=%d\n, g-vertices[0].post, i);
[printf's added by me]
It appears that this loop, which is vectorized according to the vectorizer
dump, doesn't manage to initialize g-vertices[i].post = -1 - the second printf
outputs 0 instead of expected -1 leading to dfs falsely assuming that this
vertex is new and crashing later:
nvert= 10, nq in dfs=8, post0=0
post0=0; i in dfs=10
../../gcc/gcc/crtstuff.c: In function __do_global_dtors_aux:
../../gcc/gcc/crtstuff.c:265: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See URL:http://gcc.gnu.org/bugs.html for instructions.
make[3]: *** [crtbegin.o] Error 1
make[3]: Leaving directory `/Develop/mainline/build/gcc'
make[2]: *** [all-stage2-gcc] Error 2
make[2]: Leaving directory `/Develop/mainline/build'
make[1]: *** [stage2-bubble] Error 2
make[1]: Leaving directory `/Develop/mainline/build'
make: *** [all] Error 2
lnx-toshiba:/Develop/mainline/build #
Vladimir
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28752
[Bug middle-end/28752] bootstrap comparision fails with -ftree-vectorize -maltivec on ppc and i386
--- Comment #27 from irar at il dot ibm dot com 2006-11-22 11:15 --- I committed the patch that enables vectorization of strided accesses (http://gcc.gnu.org/ml/gcc-patches/2006-03/msg01679.html), and now bootstrap with vectorization fails also on x86 with the same error as in comment #3. Here, the offending loop is cfgloopanal.c:153. Ira -- irar at il dot ibm dot com changed: What|Removed |Added GCC build triplet|powerpc64-linux |powerpc64-linux and and ||i386-linux GCC host triplet|powerpc64-linux |powerpc64-linux and i386- ||linux GCC target triplet|powerpc64-linux |powerpc64-linux and and ||i386-linux Summary|bootstrap comparision fails |bootstrap comparision fails |with -ftree-vectorize -|with -ftree-vectorize - |maltivec on ppc|maltivec on ppc and i386 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28752
