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From: "siddhesh at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/108522] New: [Regression 12/13] ICE in
 tree-object-size when struct has VLA
Date: Tue, 24 Jan 2023 16:52:33 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 13.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108522

            Bug ID: 108522
           Summary: [Regression 12/13] ICE in tree-object-size when struct
                    has VLA
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: siddhesh at gcc dot gnu.org
  Target Milestone: ---

Reproducer:

__SIZE_TYPE__ foo (unsigned int n)
{
 struct {
  unsigned char a[n];
  unsigned char b;
 } s;

 return __builtin_dynamic_object_size (&s.b, 1);
}

$ gcc/cc1 -quiet ../repro.cc -O2 -Wall -o -
        .file   "repro.cc"
        .text
during GIMPLE pass: objsz
../repro.cc: In function =E2=80=98foo=E2=80=99:
../repro.cc:1:15: internal compiler error: in execute_todo, at passes.cc:21=
40
    1 | __SIZE_TYPE__ foo (unsigned int n)
      |               ^~~
0x72216f execute_todo
        ../../gcc/passes.cc:2140
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

Looks like getting the size of object for a pointer right after a VLA in a
struct results in an ICE.  I'm on it.=