[Bug tree-optimization/92129] New: [10 Regression] ICE in vectorizable_reduction, at tree-vect-loop.c:5869

[asolokha at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92129

            Bug ID: 92129
           Summary: [10 Regression] ICE in vectorizable_reduction, at
                    tree-vect-loop.c:5869
           Product: gcc
           Version: 10.0
            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: ---

gcc-10.0.0-alpha20191013 snapshot (r276943) ICEs when compiling the following
testcase w/ -O1 -ftree-loop-vectorize -fno-tree-copy-prop:

unsigned int lq;
int aw;

void
m2 (int o9)
{
  while (o9 < 2)
    {
      for (aw = 0; aw < 2; ++aw)
        lq *= aw ? 2 : lq < 2;

      ++o9;
    }
}

% gcc-10.0.0-alpha20191013 -O1 -ftree-loop-vectorize -fno-tree-copy-prop -c
k2t5fs2w.c
during GIMPLE pass: vect
k2t5fs2w.c: In function 'm2':
k2t5fs2w.c:5:1: internal compiler error: in vectorizable_reduction, at
tree-vect-loop.c:5869
    5 | m2 (int o9)
      | ^~
0x6b8023 vectorizable_reduction(_stmt_vec_info*, _slp_tree*, _slp_instance*,
vec<stmt_info_for_cost, va_heap, vl_ptr>*)
       
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191013/work/gcc-10-20191013/gcc/tree-vect-loop.c:5869
0xe91b61 vect_analyze_loop_operations
       
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191013/work/gcc-10-20191013/gcc/tree-vect-loop.c:1561
0xe91b61 vect_analyze_loop_2
       
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191013/work/gcc-10-20191013/gcc/tree-vect-loop.c:2033
0xe91b61 vect_analyze_loop(loop*, _loop_vec_info*, vec_info_shared*)
       
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191013/work/gcc-10-20191013/gcc/tree-vect-loop.c:2336
0xeaa308 try_vectorize_loop_1
       
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191013/work/gcc-10-20191013/gcc/tree-vectorizer.c:887
0xeaad0a vectorize_loops()
       
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191013/work/gcc-10-20191013/gcc/tree-vectorizer.c:1107