https://bugs.llvm.org/show_bug.cgi?id=50621
Bug ID: 50621
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 recent regression.
$ clang-trunk -v
clang version 13.0.0 (https://github.com/llvm/llvm-project.git
61a2d6bfe48cf3da4b95d1383bf866690287f8e8)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
$ clang-trunk abc.c ; ./a.out
0
$ clang-trunk -O2 abc.c ; ./a.out
1
$ cat abc.c
short b, e;
int c, d, g;
int f[] = {2, 6, 0, 4};
void(h)();
int main() {
short a[] = {3, 2, 3};
f[2] = h || b;
for (; g <= 1; g++) {
e = 3;
for (; e; e--) {
d = 1;
if (a[g] < f[e])
d = a[g + 1] = c;
else
break;
}
}
printf("%d\n", d);
}
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