[llvm-bugs] [Bug 50458] New: wrong code at -O1, -O2 and -O3 on x86_64-linux-gnu
via llvm-bugs
llvm-bugs at lists.llvm.org
Tue May 25 01:24:43 PDT 2021
https://bugs.llvm.org/show_bug.cgi?id=50458
Bug ID: 50458
Summary: wrong code at -O1, -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: unassignedbugs at nondot.org
Reporter: zhendong.su at inf.ethz.ch
CC: llvm-bugs at lists.llvm.org
[577] % clangtk -v
clang version 13.0.0 (https://github.com/llvm/llvm-project.git
db8af0f21dc9aad4d336754c857c24470afe53e3)
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
[578] %
[578] % clangtk -O0 small.c; ./a.out
1
1
[579] % clangtk -O1 small.c; ./a.out
1
[580] %
[580] % cat small.c
int printf (const char *, ...);
int a, b = 1;
void c(int e) {
for (; a < 2; a++) {
if (b) {
printf("%d\n", b);
goto L;
}
for (; e < 1; e++)
L:;
}
}
int main() {
c(0);
return 0;
}
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