https://llvm.org/bugs/show_bug.cgi?id=25988
Bug ID: 25988
Summary: wrong code at -O2 and -O3 in both 32-bit and 64-bit
modes on x86_64-linux-gnu
Product: new-bugs
Version: trunk
Hardware: PC
OS: Windows NT
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
The following code is miscompiled by the trunk at -O2 and -O3 in both 32-bit
and 64-bit modes on x86_64-linux-gnu.
$: clang-trunk -v
clang version 3.8.0 (trunk 256676)
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 small.c -O3 ; ./a.out
Segmentation fault (core dumped)
$: clang-trunk -w small.c -O2 ; ./a.out
Segmentation fault (core dumped)
$: clang-trunk -w small.c -Os ; ./a.out
$: clang-trunk -w small.c -O3 -m32 ; ./a.out
Segmentation fault (core dumped)
$: clang-trunk -w small.c -O2 -m32 ; ./a.out
Segmentation fault (core dumped)
$: clang-trunk -w small.c -O0 ; ./a.out
$: gcc-4.8 -w small.c ; ./a.out
$:
$: cat small.c
int a, b, c, d, e;
char f;
void fn1(int);
void fn2() { fn1(a); }
void fn1(p1) {
char g;
for (; f;)
;
if (b)
for (; d;)
printf("index = [%d][%d][%d]\n", p1, e, d);
p1 = 0;
for (; p1 <= 6; p1++) {
g = 2;
for (; g <= 6; g++) {
while (b)
;
if (c)
fn2();
}
}
}
int main() {
fn2();
return 0;
}
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