https://bugs.llvm.org/show_bug.cgi?id=50906
Bug ID: 50906
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: unassignedclangb...@nondot.org
Reporter: qrzh...@gatech.edu
CC: llvm-bugs@lists.llvm.org, neeil...@live.com,
richard-l...@metafoo.co.uk
It appears to be a regression in clang-12.
$ 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;
char d[8];
char e;
int(f)(g, h) { return h > 0 && g < 7 / h || h <= 0 && g && h; }
int main() {
int i = -1L;
if (b)
c = i = 0;
if (f(i, &d[7] == &e)) {
volatile int j = 0;
}
printf("%X\n", a);
}
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