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From: "zhendong.su at inf dot ethz.ch" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/110940] New: ICE at -O3 on x86_64-linux-gnu:
 in apply_scale, at profile-count.h:1180
Date: Tue, 08 Aug 2023 03:28:19 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110940

            Bug ID: 110940
           Summary: ICE at -O3 on x86_64-linux-gnu: in apply_scale, at
                    profile-count.h:1180
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zhendong.su at inf dot ethz.ch
  Target Milestone: ---

This appears to be a recent regression.

Compiler Explorer: https://godbolt.org/z/evGMc8xEW

[595] % gcctk -v
Using built-in specs.
COLLECT_GCC=3Dgcctk
COLLECT_LTO_WRAPPER=3D/local/home/suz/suz-local/software/local/gcc-trunk/bi=
n/../libexec/gcc/x86_64-pc-linux-gnu/14.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-trunk/configure --disable-bootstrap
--enable-checking=3Dyes --prefix=3D/local/suz-local/software/local/gcc-trunk
--enable-sanitizers --enable-languages=3Dc,c++ --disable-werror --enable-mu=
ltilib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 14.0.0 20230808 (experimental) (GCC)=20
[596] %=20
[596] % gcctk -O3 -c small.c
during GIMPLE pass: vect
small.c: In function =E2=80=98main=E2=80=99:
small.c:3:5: internal compiler error: in apply_scale, at profile-count.h:11=
80
    3 | int main() {
      |     ^~~~
0xab66c3 profile_count::apply_scale(profile_count, profile_count) const
        ../../gcc-trunk/gcc/profile-count.h:1180
0x10311cf fold_loop_internal_call(gimple*, tree_node*)
        ../../gcc-trunk/gcc/tree-cfg.cc:7738
0x12d2ef5 execute
        ../../gcc-trunk/gcc/tree-vectorizer.cc:1328
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.
[597] %=20
[597] % cat small.c
int a, b[1], c, *d =3D &a, e, f, g, h, i, j;
extern int l();
int main() {
  if (l())
    for (;;)
      for (; g;)
        for (; e;)
          for (; a;)
            for (; f;)
              for (; h;)
                for (; i;)
                  for (; c;)
                    for (; j;)
                      ;
  l();
  for (; c; c++)
    b[*d] =3D 0;
  return 0;
}=