[Bug tree-optimization/99017] New: ICE: Segmentation fault (in vect_bb_vectorization_profitable_p)

[asolokha at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99017

            Bug ID: 99017
           Summary: ICE: Segmentation fault (in
                    vect_bb_vectorization_profitable_p)
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: asolokha at gmx dot com
  Target Milestone: ---
            Target: powerpc-*-linux-gnu-gcc

gcc-11.0.0-alpha20210207 snapshot (g:3d912941f29c27b2ac7c79b9e7cb2f1150e75758)
ICEs when compiling the following testcase, reduced from
gcc/testsuite/gcc.dg/torture/pr57569.c, w/ -mcpu=power8 -O3 -fno-tree-fre
-ftree-parallelize-loops=2:

int e, f, *d;

void
fn1 (void)
{
  int **g[9][6];
  int ***h = &g[6][3];

  while (e < ~0)
    {
      for (f = 0; f < 6; f++)
        g[e][f] = &d;

      e++;
    }

  **h = 0;
}

% powerpc-e300c3-linux-gnu-gcc-11.0.0 -mcpu=power8 -O3 -fno-tree-fre
-ftree-parallelize-loops=2 -c pfxmw8d8.c
during GIMPLE pass: slp
pfxmw8d8.c: In function 'fn1._loopfn.0':
pfxmw8d8.c:9:12: internal compiler error: Segmentation fault
    9 |   while (e < ~0)
      |            ^
0xe12d26 crash_signal
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-11.0.0_alpha20210207/work/gcc-11-20210207/gcc/toplev.c:327
0x10da66f vec<std::pair<unsigned int, stmt_info_for_cost*>, va_heap,
vl_embed>::operator[](unsigned int)
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-11.0.0_alpha20210207/work/gcc-11-20210207/gcc/vec.h:890
0x10da66f vec<std::pair<unsigned int, stmt_info_for_cost*>, va_heap,
vl_ptr>::operator[](unsigned int)
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-11.0.0_alpha20210207/work/gcc-11-20210207/gcc/vec.h:1461
0x10da66f vect_bb_vectorization_profitable_p
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-11.0.0_alpha20210207/work/gcc-11-20210207/gcc/tree-vect-slp.c:4433
0x10da66f vect_slp_region
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-11.0.0_alpha20210207/work/gcc-11-20210207/gcc/tree-vect-slp.c:4915
0x10da66f vect_slp_bbs
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-11.0.0_alpha20210207/work/gcc-11-20210207/gcc/tree-vect-slp.c:5043
0x10dc06c vect_slp_function(function*)
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-11.0.0_alpha20210207/work/gcc-11-20210207/gcc/tree-vect-slp.c:5129
0x10e282a execute
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-11.0.0_alpha20210207/work/gcc-11-20210207/gcc/tree-vectorizer.c:1449