https://llvm.org/bugs/show_bug.cgi?id=26266
Bug ID: 26266
Summary: wrong code at -O1 and above in 32-bit and 64-bit modes
on x86_64-linux-gnu
Product: clang
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: chengnian...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
The following code is miscompiled by the trunk at -O1 and above in both 32-bit
and 64-bit modes on x86_64-linux-gnu.
$: clang-trunk -v
clang version 3.9.0 (trunk 258508)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9.3
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.2.1
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.2.1
Found candidate GCC installation:
/usr/local/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.6.3
Found candidate GCC installation:
/usr/local/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.7.4
Found candidate GCC installation:
/usr/local/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.8.2
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$:
$: clang-trunk -w -O0 small.c ; ./a.out
$: clang-trunk small.c -O1 -m32 ; ./a.out
Aborted (core dumped)
$: clang-trunk small.c -O1 -m64 ; ./a.out
Aborted (core dumped)
$:
$: cat small.c
void abort();
char a;
int b, c = 9, d, e;
void fn1() {
unsigned f = 1;
int g = 8, h = 5;
for (; a != 6; a--) {
int *i = &h, *j;
for (;;) {
int k = e, l = ~1;
if (g && h) {
k = g;
l = f;
f = -(~(c && b) | -~(e * ~l));
if (c < f)
abort();
}
g = k;
f = l;
if (d <= 8)
break;
*i = 0;
for (; *j <= 0;)
;
}
}
}
int main() {
fn1();
return 0;
}
$:
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