[llvm-bugs] [Bug 48864] New: wrong code at -O3 on x86_64-linux-gnu

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48864

            Bug ID: 48864
           Summary: wrong code at -O3 on x86_64-linux-gnu
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: zhendong.su at inf.ethz.ch
                CC: llvm-bugs at lists.llvm.org

[590] % clangtk -v
clang version 12.0.0 (https://github.com/llvm/llvm-project.git
dcc7706fcf2438b92d6f619e63c5db4880042ed2)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /local/suz-local/opfuzz/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.5.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
[591] % 
[591] % clangtk -O2 small.c; ./a.out
[592] % 
[592] % clangtk -O3 small.c
[593] % ./a.out
Aborted
[594] % 
[594] % cat small.c
int a, b, c, *d, e, *f = &a, **g, *h;

int main() {
  for (; e < 1; e++) {
    g = &h;
    for (; c < 1; c++) {
      int *i = &b;
      *g = f;
      d = 0;
      *i = 0;
      if (h != &a)
        __builtin_abort();
    }
  }
  return 0;
}

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