http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53571
Tobias Burnus <burnus at gcc dot gnu.org> changed:
What |Removed |Added
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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 0x00002aaaaace1656 in cloog_domain_stride (domain=<optimized out>,
strided_level=<optimized out>,
nb_par=<optimized out>, stride=0x7fffffffd5e0, offset=0x7fffffffd5d0) at
source/ppl/domain.c:2813
#1 0x00002aaaaacd7b21 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 0x00002aaaaacd71f3 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 0x00002aaaaace834b in cloog_program_generate (program=0x1595d00,
options=0x1596780) at source/program.c:687
#6 0x0000000000cd34b5 in scop_to_clast (scop=0x158e890)
at /home/tob/projects/gcc-git/gcc/gcc/graphite-clast-to-gimple.c:1551
#7 0x0000000000cd36d5 in gloog (scop=0x158e890, bb_pbb_mapping=0x158e4f0)
at /home/tob/projects/gcc-git/gcc/gcc/graphite-clast-to-gimple.c:1632
#8 0x0000000000cd078e in graphite_transform_loops () at
/home/tob/projects/gcc-git/gcc/gcc/graphite.c:276
#9 0x00000000009e2c87 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.
