[Bug tree-optimization/53571] [4.6/4.7/4.8 regression] ICE with -O{2,3} -floop-parallelize-all in cloog_domain_stride()
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53571 Tobias Burnus burnus at gcc dot gnu.org changed: What|Removed |Added CC||burnus at gcc dot gnu.org --- Comment #4 from Tobias Burnus burnus at gcc dot gnu.org 2012-06-05 21:03:03 UTC --- (In reply to comment #1) Please specify the cloog/ppl versions you are using. What target is this on? I can reproduce it with the current GCC trunk on openSUSE Factory (x86-64) [package libcloog0-debuginfo-0.15.10+ppl-9.8]. Program received signal SIGSEGV, Segmentation fault. #0 0x2ace1656 in cloog_domain_stride (domain=optimized out, strided_level=optimized out, nb_par=optimized out, stride=0x7fffd5e0, offset=0x7fffd5d0) at source/ppl/domain.c:2813 #1 0x2acd7b21 in cloog_loop_stride_1 (nb_par=2, level=1, loop=0x15a8c20) at source/loop.c:1077 #2 cloog_loop_generate_general (loop=0x0, level=1, scalar=1, scaldims=0x158b000, nb_scattdims=3, nb_par=optimized out, options=0x1596780) at source/loop.c:1371 #3 0x2acd71f3 in cloog_loop_generate_scalar (options=0x1596780, nb_par=2, nb_scattdims=3, scaldims=0x158b000, scalar=0, level=1, loop=0x159c930) at source/loop.c:1489 #4 cloog_loop_generate (loop=optimized out, context=0x0, level=1, scalar=0, scaldims=0x158b000, nb_scattdims=3, nb_par=2, options=0x1596780) at source/loop.c:1573 #5 0x2ace834b in cloog_program_generate (program=0x1595d00, options=0x1596780) at source/program.c:687 #6 0x00cd34b5 in scop_to_clast (scop=0x158e890) at /home/tob/projects/gcc-git/gcc/gcc/graphite-clast-to-gimple.c:1551 #7 0x00cd36d5 in gloog (scop=0x158e890, bb_pbb_mapping=0x158e4f0) at /home/tob/projects/gcc-git/gcc/gcc/graphite-clast-to-gimple.c:1632 #8 0x00cd078e in graphite_transform_loops () at /home/tob/projects/gcc-git/gcc/gcc/graphite.c:276 #9 0x009e2c87 in graphite_transforms () at /home/tob/projects/gcc-git/gcc/gcc/tree-ssa-loop.c:254 The failing line is: cloog_vector_gcd (U-p[0], U-NbColumns, stride); The problem is that U-p == NULL. And U is initialized via cloog_solve_diophantine, cloog_matrix_hermite (temp, hermi, unimod); rank = cloog_dio_get_first_diagonal_zero (hermi); nbc = temp-NbColumns; ... *u = cloog_dio_init_U (unimodinv, hermi-NbColumns, rank); In the latter, one has: if (rank == n) return cloog_matrix_alloc (0, 0); And according to gdb rank==2 (the other arguments are optimized out). Well, and for a 0 argument, cloog_matrix_alloc sets u-p to NULL.
[Bug tree-optimization/53571] [4.6/4.7/4.8 regression] ICE with -O{2,3} -floop-parallelize-all in cloog_domain_stride()
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53571 Richard Guenther rguenth at gcc dot gnu.org changed: What|Removed |Added Status|UNCONFIRMED |WAITING Last reconfirmed||2012-06-04 Target Milestone|--- |4.6.4 Ever Confirmed|0 |1 --- Comment #1 from Richard Guenther rguenth at gcc dot gnu.org 2012-06-04 10:07:39 UTC --- Please specify the cloog/ppl versions you are using. What target is this on?
[Bug tree-optimization/53571] [4.6/4.7/4.8 regression] ICE with -O{2,3} -floop-parallelize-all in cloog_domain_stride()
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53571 --- Comment #2 from Kacper Kowalik xarthisius.kk at gmail dot com 2012-06-04 10:11:09 UTC --- (In reply to comment #1) Please specify the cloog/ppl versions you are using. What target is this on? dev-libs/cloog-ppl-0.15.10 dev-libs/ppl-0.11.2-r1 Using built-in specs. COLLECT_GCC=/usr/x86_64-pc-linux-gnu/gcc-bin/4.6.3/gcc COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/4.6.3/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: /dev/shm/portage/sys-devel/gcc-4.6.3/work/gcc-4.6.3/configure --prefix=/usr --bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/4.6.3 --includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.6.3/include --datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.6.3 --mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.6.3/man --infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.6.3/info --with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.6.3/include/g++-v4 --host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --disable-altivec --disable-fixed-point --with-ppl --with-cloog --disable-ppl-version-check --with-cloog-include=/usr/include/cloog-ppl --enable-lto --enable-nls --without-included-gettext --with-system-zlib --enable-obsolete --disable-werror --enable-secureplt --enable-multilib --enable-libmudflap --disable-libssp --enable-libgomp --with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/4.6.3/python --enable-checking=release --disable-libgcj --enable-languages=c,c++,fortran --enable-shared --enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu --enable-targets=all --with-bugurl=http://bugs.gentoo.org/ --with-pkgversion='Gentoo 4.6.3 p1.3, pie-0.5.1' Thread model: posix gcc version 4.6.3 (Gentoo 4.6.3 p1.3, pie-0.5.1)
[Bug tree-optimization/53571] [4.6/4.7/4.8 regression] ICE with -O{2,3} -floop-parallelize-all in cloog_domain_stride()
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53571 --- Comment #3 from Kacper Kowalik xarthisius.kk at gmail dot com 2012-06-04 18:23:12 UTC --- Git bisect show this revision as a culprit: http://gcc.gnu.org/viewcvs?view=revisionrevision=163142
