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From: "haoxintu at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/103219] New: [12 Regression] ICE Segmentation
 fault at -O3 (during GIMPLE pass: unrolljam)
Date: Sat, 13 Nov 2021 02:21:26 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103219

            Bug ID: 103219
           Summary: [12 Regression] ICE Segmentation fault at -O3 (during
                    GIMPLE pass: unrolljam)
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: haoxintu at gmail dot com
  Target Milestone: ---

Hi all.

I am not sure whether there is a dup but it appears to be a recent regressi=
on
issue.

$cat small.c
int a, b, c, e;
int d[10];
int main() {
  if (c)
    if (f()) {
      g();
      if (e) {
        a =3D 0;
        for (; a !=3D 6; a =3D a + 2) {
          b =3D 0;
          for (; b <=3D 3; b++)
            d[b] &=3D 1;
        }
      }
    }
  return 0;
}

$gcc -w -O3
during GIMPLE pass: unrolljam
small.c: In function =E2=80=98main=E2=80=99:
small.c:3:5: internal compiler error: Segmentation fault
    3 | int main() {
      |     ^~~~
0xc290af crash_signal
        ../../gcc/toplev.c:322
0x17bfea7 tree_loop_unroll_and_jam
        ../../gcc/gimple-loop-jam.c:596
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.


$gcc -v
Using built-in specs.
COLLECT_GCC=3Dgcc
COLLECT_LTO_WRAPPER=3D/media/haoxin/SeagateData/haoxin-data/dut-research/co=
mpilers/gcc/build/bin/../libexec/gcc/x86_64-pc-linux-gnu/12.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with:../configure
--prefix=3D/home/haoxin/haoxin-data/dut-research/compilers/gcc/build/
--enable-bootstrap --enable-checking=3Drelease --enable-languages=3Dc,c++
--enable-multilib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 12.0.0 20211112 (experimental) (GCC)=20

Can also check here: https://godbolt.org/z/r7TKr8MxW


Thanks,
Haoxin=