https://llvm.org/bugs/show_bug.cgi?id=25908
Bug ID: 25908
Summary: wrong code on x86_64-linux-gnu at -O3 in both 32-bit
and 64-bit modes
Product: new-bugs
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: chengnian...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
$: clang-trunk -v
clang version 3.8.0 (trunk 256125)
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 small.c -w -O3 -m64 ; ./a.out
0
Segmentation fault (core dumped)
$: clang-trunk small.c -w -O3 -m32 ; ./a.out
0
Segmentation fault (core dumped)
$: clang-trunk small.c -w -O0 ; ./a.out
0
$:
$:
$: cat small.c
int printf(const char*, ...);
int a, c, d, e, g, i, j;
volatile int b;
volatile short f = 5;
volatile char h;
short o;
void fn1() {
while (i)
;
short k = f && h % 5;
int l = ~j % f;
short m = ~j & k;
int n = 5 % ~h;
g = f | 1 && m ^ l | n;
}
static short fn2() {
int p = 3;
for (; p >= 0; p--) {
o = 0;
for (; o <= 3; o++) {
d = 0;
for (; d <= 3; d++)
b &= 5;
}
if (e)
break;
}
return 1;
}
static int fn3() {
c = 0;
for (; c <= 3; c++) {
fn2();
fn1();
e = 0;
}
return 1;
}
int main() {
fn3();
printf("%X\n", a);
return 0;
}
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