https://bugs.llvm.org/show_bug.cgi?id=49661
Bug ID: 49661
Summary: wrong code at -O2 and -O3 on x86_64-linux-gnu
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
[520] % clangtk -v
clang version 13.0.0 (https://github.com/llvm/llvm-project.git
f860187ea6e9b30e1ecf74784f0af0e0c9ecc01c)
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
[521] %
[521] % clangtk -Os small.c; ./a.out
[522] %
[522] % clangtk -O2 small.c
[523] % ./a.out
Segmentation fault
[524] %
[524] % cat small.c
static int *a[2][3][3], b, c;
int main() {
for (c = 0; c < 2; c++)
for (b = 0; b < 2; b++)
a[1][c][b] = a[0][0][0];
return 0;
}
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