https://bugs.llvm.org/show_bug.cgi?id=51175
Bug ID: 51175
Summary: wrong code at -O3 on x86_64-linux-gnu
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: LLVM Codegen
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected]
It appears to be a latent issue. It affects all versions since clang-7.
$ clang-trunk -v
clang version 13.0.0 (https://github.com/llvm/llvm-project.git
599b2f00370ee79e812d2776f2af57fae36d02e9)
$ clang-trunk abc.c ; ./a.out
4
$ clang-trunk -O3 abc.c ; ./a.out
0
$ clang-7 -O3 abc.c ; ./a.out
0
$ cat abc.c
short a = -1;
short c = 4;
int b;
int main() {
char d;
b = 65527 & ++a;
d = 0 == 0 ? b : 0;
if (d)
c = 0;
printf("%d\n", c);
}
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