https://llvm.org/bugs/show_bug.cgi?id=25154
Bug ID: 25154
Summary: wrong code at -O2 and -O3 on x86_64-linux-gnu
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: s...@cs.ucdavis.edu
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
The following code is miscompiled by the current clang trunk (and 3.7.x) on
x86_64-linux-gnu at -O2 and -O3 in both 32-bit and 64-bit modes.
This is a regression from 3.6.x.
$ clang-trunk -v
clang version 3.8.0 (trunk 250080)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/tools/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9.2
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.1.0
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/4.9.2
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.1.0
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 -Os small.c; ./a.out
$ clang-3.6 -O2 small.c; ./a.out
$
$ clang-trunk -O2 small.c
$ ./a.out
Aborted (core dumped)
$
$ clang-3.7.0 -O2 small.c
$ ./a.out
Aborted (core dumped)
$
----------------------------------------
#include <assert.h>
struct
{
int f0;
short f1;
short f2;
short f3;
} b, e;
int a, **c, f, *m, d, i, j, l, n;
short ****g;
void
fn1 ()
{
int o;
if (f)
{
for (; e.f0; e.f0++)
for (; d; d = 0)
*c = &o;
assert (a);
*m &= i | ((j == 0) == l) | n;
for (; b.f1 >= 0; b.f1++)
;
}
for (b.f3 = 0; b.f3 < 2; b.f3++)
{
short *****h = 0;
for (b.f2 = 0; b.f2; b.f2--)
h = &g;
assert (!h);
}
}
int
main ()
{
fn1 ();
if (b.f3 != 2)
__builtin_abort ();
return 0;
}
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