[LLVMbugs] [Bug 21377] New: clang hangs on valid code at -Os and above on x86_64-linux-gnu
bugzilla-daemon at llvm.org
bugzilla-daemon at llvm.org
Fri Oct 24 19:28:29 PDT 2014
http://llvm.org/bugs/show_bug.cgi?id=21377
Bug ID: 21377
Summary: clang hangs on valid code at -Os and above on
x86_64-linux-gnu
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangbugs at nondot.org
Reporter: su at cs.ucdavis.edu
CC: llvmbugs at cs.uiuc.edu
Classification: Unclassified
The following test case causes the current clang trunk to hang when compiling
at -Os and above in both 32-bit and 64-bit modes on x86_64-linux-gnu.
It also affects all earlier versions of clang and MacOS X.
$ clang-trunk -v
clang version 3.6.0 (trunk 220587)
Target: x86_64-unknown-linux-gnu
Thread model: posix
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.8.1
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.6
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/4.8.1
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Selected multilib: .;@m64
$
$ clang-trunk -O1 small.c; a.out
$
$ timeout -s 9 30 clang-trunk -Os small.c
Killed
$
$ time gcc-trunk -Os small.c
0.02user 0.00system 0:00.12elapsed 26%CPU (0avgtext+0avgdata 50752maxresident)k
0inputs+32outputs (1major+6636minor)pagefaults 0swaps
$
$ time icc -Os small.c
0.05user 0.06system 0:00.43elapsed 27%CPU (0avgtext+0avgdata 84848maxresident)k
0inputs+240outputs (1major+20231minor)pagefaults 0swaps
$
$ time clang-trunk -O1 small.c
0.00user 0.02system 0:00.11elapsed 30%CPU (0avgtext+0avgdata 63872maxresident)k
0inputs+32outputs (1major+6322minor)pagefaults 0swaps
$
--------------------
int a, c, d;
unsigned int b;
static int e[1];
long long f;
long long
fn1 ()
{
return a;
}
void
fn2 ()
{
int g;
while (c)
{
f = b;
g |= f;
while (c)
g = e[0];
g |= fn1 ();
}
}
int
main ()
{
fn2 ();
return 0;
}
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