http://llvm.org/bugs/show_bug.cgi?id=19595
Bug ID: 19595
Summary: clang hangs on valid code at -O1 and above on
x86_64-linux-gnu (affecting all clang versions)
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 (as well as all earlier
versions from 2.9) to hang when compiling at -O1 and above in both 32-bit and
64-bit modes on x86_64-linux-gnu.
$ clang-trunk -v
clang version 3.5.0 (trunk 207415)
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 -O0 -c small.c
$
$ timeout -s 9 60 clang-trunk -O1 -c small.c
Killed
$
$ time gcc-trunk -O1 -c small.c
0.01user 0.00system 0:00.16elapsed 11%CPU (0avgtext+0avgdata 43360maxresident)k
0inputs+16outputs (0major+4851minor)pagefaults 0swaps
$
$ time gcc-trunk -O3 -c small.c
0.01user 0.01system 0:00.12elapsed 18%CPU (0avgtext+0avgdata 46272maxresident)k
0inputs+16outputs (0major+5046minor)pagefaults 0swaps
$
----------------------------
int a, b;
int
fn1 (int p)
{
return p;
}
void
fn2 ()
{
for (;;)
;
}
int
fn3 (short p)
{
fn2 ();
for (; b;)
;
lbl:
if (p)
return 0;
fn1 (p && a);
if (p)
for (;;)
;
goto lbl;
}
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