[Bug tree-optimization/92554] New: [10 Regression] ICE in vect_create_epilog_for_reduction, at tree-vect-loop.c:4325

[asolokha at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92554

            Bug ID: 92554
           Summary: [10 Regression] ICE in
                    vect_create_epilog_for_reduction, at
                    tree-vect-loop.c:4325
           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: ---
            Target: x86_64-pc-linux-gnu

gcc-10.0.0-alpha20191110 snapshot (r278028) ICEs when compiling the following
testcase w/ -O1:

short int w9;

void __attribute__ ((simd))
zc (int in)
{
  int va = 1;

  w9 *= va != 0 ? in < 0 : 0;
}

% x86_64-pc-linux-gnu-gcc-10.0.0-alpha20191110 -O1 -c naktcfe6.c
during GIMPLE pass: vect
naktcfe6.c: In function 'zc.simdclone.4':
naktcfe6.c:4:1: internal compiler error: in vect_create_epilog_for_reduction,
at tree-vect-loop.c:4325
    4 | zc (int in)
      | ^~
0x6bd233 vect_create_epilog_for_reduction
       
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191110/work/gcc-10-20191110/gcc/tree-vect-loop.c:4325
0x6bd233 vectorizable_live_operation(_stmt_vec_info*, gimple_stmt_iterator*,
_slp_tree*, _slp_instance*, int, bool, vec<stmt_info_for_cost, va_heap,
vl_ptr>*)
       
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191110/work/gcc-10-20191110/gcc/tree-vect-loop.c:7608
0xe665f0 can_vectorize_live_stmts
       
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191110/work/gcc-10-20191110/gcc/tree-vect-stmts.c:10612
0xe665f0 can_vectorize_live_stmts
       
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191110/work/gcc-10-20191110/gcc/tree-vect-stmts.c:10593
0xe86c9c vect_transform_stmt(_stmt_vec_info*, gimple_stmt_iterator*,
_slp_tree*, _slp_instance*)
       
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191110/work/gcc-10-20191110/gcc/tree-vect-stmts.c:11064
0xe88eea vect_transform_loop_stmt
       
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191110/work/gcc-10-20191110/gcc/tree-vect-loop.c:8049
0xe9d796 vect_transform_loop(_loop_vec_info*)
       
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191110/work/gcc-10-20191110/gcc/tree-vect-loop.c:8451
0xeb706f try_vectorize_loop_1
       
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191110/work/gcc-10-20191110/gcc/tree-vectorizer.c:989
0xeb7c6d vectorize_loops()
       
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191110/work/gcc-10-20191110/gcc/tree-vectorizer.c:1125