[Bug rtl-optimization/87895] New: ICE in purge_dead_edges, at cfgrtl.c:3246

[asolokha at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87895

            Bug ID: 87895
           Summary: ICE in purge_dead_edges, at cfgrtl.c:3246
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Keywords: ice-on-invalid-code, openmp
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: asolokha at gmx dot com
  Target Milestone: ---
            Target: x86_64-pc-linux-gnu

gcc-9.0.0-alpha20181104 snapshot (r265779), 8.2, 7.3, 6.3, 5.4, 4.9.4 all ICE
when compiling the following snippet w/ -fopenmp:

#pragma omp declare simd
int
vm (int oh)
{
  if (oh == 0)
    return 0;
}

% x86_64-pc-linux-gnu-gcc-9.0.0-alpha20181104 -fopenmp -c eyi5ymyi.c
during RTL pass: expand
eyi5ymyi.c: In function 'vm.simdclone.0':
eyi5ymyi.c:7:1: internal compiler error: in purge_dead_edges, at cfgrtl.c:3246
    7 | }
      | ^
0x5dd3b1 purge_dead_edges(basic_block_def*)
       
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20181104/work/gcc-9-20181104/gcc/cfgrtl.c:3246
0x144f5d4 find_bb_boundaries
       
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20181104/work/gcc-9-20181104/gcc/cfgbuild.c:589
0x144f5d4 find_many_sub_basic_blocks(simple_bitmap_def*)
       
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20181104/work/gcc-9-20181104/gcc/cfgbuild.c:672
0x8a53d1 execute
       
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20181104/work/gcc-9-20181104/gcc/cfgexpand.c:651