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From: "amonakov at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/106783] New: [12/13 Regression] ICE in
 ipa-modref.cc:analyze_function
Date: Wed, 31 Aug 2022 08:58:26 +0000
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X-Bugzilla-Type: new
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: ipa
X-Bugzilla-Version: 13.0
X-Bugzilla-Keywords: ice-on-valid-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: amonakov at gcc dot gnu.org
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106783

            Bug ID: 106783
           Summary: [12/13 Regression] ICE in
                    ipa-modref.cc:analyze_function
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: ipa
          Assignee: unassigned at gcc dot gnu.org
          Reporter: amonakov at gcc dot gnu.org
                CC: amonakov at gcc dot gnu.org, asolokha at gmx dot com,
                    marxin at gcc dot gnu.org, unassigned at gcc dot gnu.org
  Target Milestone: ---

+++ This bug was initially created as a clone of Bug #106781 +++

ICEs when emitting a tree dump with -O2 -fdump-tree-modref2

int n;

__attribute__ ((noinline,noclone,returns_twice)) static int
bar (int)
{
  n /=3D 0;

  return n;
}

int
foo (int x)
{
  return bar (x);
}

t.c: In function =E2=80=98foo=E2=80=99:
t.c:12:1: internal compiler error: in analyze_function, at ipa-modref.cc:32=
86
   12 | foo (int x)
      | ^~~
0x10e548e analyze_function
        gcc/ipa-modref.cc:3286
0x10e83b5 execute
        gcc/ipa-modref.cc:4186


Note that -fdump-tree-modref2 is needed. It reaches a gcc_unreachable(), I'd
suggest to move the verification outside of dumping if possible, so the
compiler doesn't ICE or not depending on whether dumping is requested.=