https://bugs.llvm.org/show_bug.cgi?id=48864
Bug ID: 48864
Summary: wrong code at -O3 on x86_64-linux-gnu
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Scalar Optimizations
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
[590] % clangtk -v
clang version 12.0.0 (https://github.com/llvm/llvm-project.git
dcc7706fcf2438b92d6f619e63c5db4880042ed2)
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
[591] %
[591] % clangtk -O2 small.c; ./a.out
[592] %
[592] % clangtk -O3 small.c
[593] % ./a.out
Aborted
[594] %
[594] % cat small.c
int a, b, c, *d, e, *f = &a, **g, *h;
int main() {
for (; e < 1; e++) {
g = &h;
for (; c < 1; c++) {
int *i = &b;
*g = f;
d = 0;
*i = 0;
if (h != &a)
__builtin_abort();
}
}
return 0;
}
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