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From: "reichelt at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/101162] New: [12 Regression] ICE (verify_gimple failed) for
 switch returning pointer-to-members
Date: Tue, 22 Jun 2021 08:40:24 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101162

            Bug ID: 101162
           Summary: [12 Regression] ICE (verify_gimple failed) for switch
                    returning pointer-to-members
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: reichelt at gcc dot gnu.org
  Target Milestone: ---

The following valid testcase triggers an ICE on trunk when compiled with "-=
O2":

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
struct A
{
  int i1, i2, i3, i4, i5, i6;
};

int A::* foo(int i)
{
  switch (i)
  {
    case 1: return &A::i1;
    case 2: return &A::i2;
    case 3: return &A::i3;
    case 4: return &A::i4;
    case 5: return &A::i5;
    case 6: return &A::i6;
  }

  return 0;
}
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

bug.cc: In function 'int A::* foo(int)':
bug.cc:19:1: error: invalid types for 'mult_expr'
   19 | }
      | ^
<<< Unknown tree: offset_type >>>
<<< Unknown tree: offset_type >>>
<<< Unknown tree: offset_type >>>
_7 =3D 4 * _6;
during GIMPLE pass: switchconv
bug.cc:19:1: internal compiler error: verify_gimple failed
0x11025aa verify_gimple_in_cfg(function*, bool)
        ../../gcc/gcc/tree-cfg.c:5531
0xfe1587 execute_function_todo
        ../../gcc/gcc/passes.c:2042
0xfe1fab execute_todo
        ../../gcc/gcc/passes.c:2096
Please submit a full bug report, [etc.]

This regression was introduced between 2021-06-14 and 2021-06-21.=