http://llvm.org/bugs/show_bug.cgi?id=20079
Bug ID: 20079
Summary: clang hangs on valid code at -O1 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: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
The following testcase causes the current clang trunk to hang when compiling at
-O1 and above in both 32-bit and 64-bit modes on x86_64-linux-gnu.
This is a regression from 3.4.
$ clang-trunk -v
clang version 3.5.0 (trunk 211159)
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
$
$ time clang-trunk -O0 -c small.c
0.00user 0.00system 0:00.07elapsed 17%CPU (0avgtext+0avgdata 41840maxresident)k
0inputs+8outputs (0major+3835minor)pagefaults 0swaps
$ time clang-3.4 -O1 -c small.c
0.01user 0.00system 0:00.06elapsed 23%CPU (0avgtext+0avgdata 47680maxresident)k
0inputs+8outputs (0major+4053minor)pagefaults 0swaps
$ time clang-3.4 -O3 -c small.c
0.00user 0.01system 0:00.09elapsed 17%CPU (0avgtext+0avgdata 48192maxresident)k
0inputs+8outputs (0major+4085minor)pagefaults 0swaps
$
$ timeout -s 9 60 clang-trunk -O1 -c small.c
Killed
$
--------------------------------
int a, b[1], c, *d, e, f, g, *h;
void
fn1 ()
{
d = h = &b[0];
f = -a;
g = -1;
e = (g ^ f) * (d == &c);
}
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