[Bug tree-optimization/92742] New: [10 Regression] ICE in info_for_reduction, at tree-vect-loop.c:4367

[asolokha at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92742

            Bug ID: 92742
           Summary: [10 Regression] ICE in info_for_reduction, at
                    tree-vect-loop.c:4367
           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-alpha20191124 snapshot (r278660) ICEs when compiling the following
testcase w/ -O3:

unsigned int qw;

int
rs (int iq, int wg)
{
  for (qw = 0; qw < 2; ++qw)
    {
    }

  while (iq < 1)
    {
      wg *= qw * 2;
      ++iq;
    }

  return wg;
}

% gcc-10.0.0-alpha20191124 -O3 -c bcr4em7v.c
during GIMPLE pass: vect
bcr4em7v.c: In function 'rs':
bcr4em7v.c:4:1: internal compiler error: in info_for_reduction, at
tree-vect-loop.c:4367
    4 | rs (int iq, int wg)
      | ^~
0x6d760c info_for_reduction(_stmt_vec_info*)
       
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191124/work/gcc-10-20191124/gcc/tree-vect-loop.c:4367
0xf5e0b4 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_alpha20191124/work/gcc-10-20191124/gcc/tree-vect-loop.c:5967
0xf4ed0a vect_analyze_stmt(_stmt_vec_info*, bool*, _slp_tree*, _slp_instance*,
vec<stmt_info_for_cost, va_heap, vl_ptr>*)
       
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191124/work/gcc-10-20191124/gcc/tree-vect-stmts.c:10849
0xf7ae0c vect_slp_analyze_node_operations_1
       
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191124/work/gcc-10-20191124/gcc/tree-vect-slp.c:2792
0xf7ae0c vect_slp_analyze_node_operations
       
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191124/work/gcc-10-20191124/gcc/tree-vect-slp.c:2898
0xf7e7b1 vect_slp_analyze_operations(vec_info*)
       
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191124/work/gcc-10-20191124/gcc/tree-vect-slp.c:2932
0xf66527 vect_analyze_loop_2
       
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191124/work/gcc-10-20191124/gcc/tree-vect-loop.c:2125
0xf66527 vect_analyze_loop(loop*, vec_info_shared*)
       
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191124/work/gcc-10-20191124/gcc/tree-vect-loop.c:2554
0xf84b90 try_vectorize_loop_1
       
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191124/work/gcc-10-20191124/gcc/tree-vectorizer.c:892
0xf8560e vectorize_loops()
       
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191124/work/gcc-10-20191124/gcc/tree-vectorizer.c:1125