[llvm-bugs] [Bug 50253] New: wrong code at -O2 and -O3 on x86_64-linux-gnu (generated code segfaults)

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=50253

            Bug ID: 50253
           Summary: wrong code at -O2 and -O3 on x86_64-linux-gnu
                    (generated code segfaults)
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Loop Optimizer
          Assignee: unassignedbugs at nondot.org
          Reporter: zhendong.su at inf.ethz.ch
                CC: llvm-bugs at lists.llvm.org

[515] % clangtk -v
clang version 13.0.0 (https://github.com/llvm/llvm-project.git
f7294ac8093a2fbd8c00254580eaac6c4e1f7b24)
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
[516] % 
[516] % clangtk -Os small.c; ./a.out
[517] % 
[517] % clangtk -O2 small.c
[518] % ./a.out
Segmentation fault
[519] % 
[519] % cat small.c
static int a, *b[10][9];
int main() {
  for (a = 0; a < 9; a++)
    b[5][a] = b[a+1][4];
  return 0;
}

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