[Bug tree-optimization/90134] New: ICE in duplicate_eh_regions_1, at except.c:557

[asolokha at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90134

            Bug ID: 90134
           Summary: ICE in duplicate_eh_regions_1, at except.c:557
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Keywords: ice-on-invalid-code, openmp
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: asolokha at gmx dot com
  Target Milestone: ---

g++-9.0.0-alpha20190414 snapshot (r270355), 8.3, 7.4, 6.3 all ICE when
compiling the following testcase w/ -O1 (-O2, -O3, -Ofast)
-fnon-call-exceptions -ftree-parallelize-loops=2 --param
max-loop-header-insns=1 (the last --param is not needed for gcc 6.3):

void
ot ();

struct xv {
  int te;
};

class m7 {
public:
  ~m7 ()
  {
    for (int za = qr; za < 1; ++za)
      {
        xv *fq;

        if (fq->te == 0)
          ;
      }

    try {
      ot ();
    } catch (...) {
    }
  }

private:
  int qr;
};

m7 n1;

% g++-9.0.0-alpha20190414 -O1 -fnon-call-exceptions -ftree-parallelize-loops=2
--param max-loop-header-insns=1 -c tfl5v9ir.cc
during GIMPLE pass: ompexpssa
tfl5v9ir.cc: In function 'm7___m7._loopfn.0':
tfl5v9ir.cc:12:26: internal compiler error: in duplicate_eh_regions_1, at
except.c:557
   12 |     for (int za = qr; za < 1; ++za)
      |                       ~~~^~~
0x6b4497 duplicate_eh_regions_1
       
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20190414/work/gcc-9-20190414/gcc/except.c:557
0xc29281 duplicate_eh_regions_1
       
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20190414/work/gcc-9-20190414/gcc/except.c:599
0xc29784 duplicate_eh_regions(function*, eh_region_d*, int, tree_node*
(*)(tree_node*, void*), void*)
       
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20190414/work/gcc-9-20190414/gcc/except.c:628
0xfc4bc1 move_sese_region_to_fn(function*, basic_block_def*, basic_block_def*,
tree_node*)
       
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20190414/work/gcc-9-20190414/gcc/tree-cfg.c:7509
0xe4ab0c expand_omp_taskreg
       
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20190414/work/gcc-9-20190414/gcc/omp-expand.c:1427
0xe51237 expand_omp_synch
       
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20190414/work/gcc-9-20190414/gcc/omp-expand.c:6344
0xe51237 expand_omp
       
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20190414/work/gcc-9-20190414/gcc/omp-expand.c:8189
0xe5305d execute_expand_omp
       
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20190414/work/gcc-9-20190414/gcc/omp-expand.c:8381