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From: "krebbel at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/111039] New: Unable to coalesce ssa_names
Date: Wed, 16 Aug 2023 19:28:00 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 14.0
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: krebbel at gcc dot gnu.org
X-Bugzilla-Status: UNCONFIRMED
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111039

            Bug ID: 111039
           Summary: Unable to coalesce ssa_names
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: krebbel at gcc dot gnu.org
  Target Milestone: ---

compiler_corruption_function(flags) {
  int nowait =3D flags & 1048576, isexpand =3D flags & 8388608;
  abcd();
  _setjmp(flags);
  if (nowait && isexpand)
    flags &=3D 0;
  abcde();
}

gcc -mbranch-cost=3D0 -O t.c
verified with recent GCC: 02ecc9a2632

t.c: In function =E2=80=98compiler_corruption_function=E2=80=99:
t.c:1:1: internal compiler error: SSA corruption
    1 | compiler_corruption_function(flags) {
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
0x15a657c fail_abnormal_edge_coalesce
        /home/andreas/build/../gcc/gcc/tree-ssa-coalesce.cc:1003
0x15a657c coalesce_partitions
        /home/andreas/build/../gcc/gcc/tree-ssa-coalesce.cc:1425
0x15a657c coalesce_ssa_name(_var_map*)
        /home/andreas/build/../gcc/gcc/tree-ssa-coalesce.cc:1755
0x153d6cf remove_ssa_form
        /home/andreas/build/../gcc/gcc/tree-outof-ssa.cc:1065
0x153d6cf rewrite_out_of_ssa(ssaexpand*)
        /home/andreas/build/../gcc/gcc/tree-outof-ssa.cc:1323
0xf42073 execute
        /home/andreas/build/../gcc/gcc/cfgexpand.cc:6610

This very much looks like another instance of PR71020.=