[llvm-bugs] [Bug 50902] New: wrong code at -O2 on x86_64-linux-gnu

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=50902

            Bug ID: 50902
           Summary: wrong code at -O2 on x86_64-linux-gnu
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: LLVM Codegen
          Assignee: unassignedclangbugs at nondot.org
          Reporter: qrzhang at gatech.edu
                CC: llvm-bugs at lists.llvm.org, neeilans at live.com,
                    richard-llvm at metafoo.co.uk

It appears to be a regression in clang-11.

$ clang-trunk -v
clang version 13.0.0 (https://github.com/llvm/llvm-project.git
043ce4e6bdd376ff460d78446d1a6b94c6e0f18c)
Target: x86_64-unknown-linux-gnu
Thread model: posix


$ clang-trunk abc.c ; ./a.out
0


$ clang-trunk -O2 abc.c ; ./a.out
Floating point exception


$ cat abc.c
int a, b, c, d;
char e[8];
char f;
int(g)(h, i) { return i && h < -1 / i; }
int main() {
  int j = 1;
  if (b)
    c = j = 0;
  if (g(j, &e[7] == &f))
    d = 1;
  printf("%X\n", a);
}

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