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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 tree-optimization/110369] New: wrong code on x86_64-linux-gnu
Date: Thu, 22 Jun 2023 18:36:20 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110369

            Bug ID: 110369
           Summary: wrong code on x86_64-linux-gnu
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zhendong.su at inf dot ethz.ch
  Target Milestone: ---

It appears to be a recent regression. I'm unsure how interesting the test i=
s as
it uses a few non-default flags, but here it is.

Compiler Explorer: https://godbolt.org/z/rvsrfzb1K

[813] % 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
--disable-multilib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 14.0.0 20230622 (experimental) [master r14-924-gd709841ae0f] (G=
CC)=20
[814] %=20
[814] % gcctk -O3 -fno-thread-jumps -fsel-sched-pipelining
-fsel-sched-pipelining-outer-loops -fno-split-loops -fno-tree-loop-ivcanon
-fselective-scheduling2 -w small.c
[815] % timeout -s 9 5 ./a.out
Killed
[816] %=20
[816] % gcctk -O3 -w small.c; ./a.out
[817] %=20
[817] % cat small.c
int printf(const char *, ...);
int a, b[2] =3D {0, 0}, c;
void d() {
  int e, f;
  for (f =3D 0; f < 2; f++)
    if (a) {
      for (e =3D 0; e < 5; e++) {
        printf("%d", b[e]);
        if (c)
          printf("\n");
      }
    }
}
int main() { d(); }=