http://llvm.org/bugs/show_bug.cgi?id=18886
Bug ID: 18886
Summary: wrong code (hangs) at -O1 and above on
x86_64-linux-gnu (in both 32-bit and 64-bit modes)
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 code is miscompiled by the current clang trunk 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 (trunk 201573)
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 multiilb: .;@m64
Candidate multiilb: 32;@m32
Selected multilib: .;@m64
$
$ clang-trunk -O0 small.c; a.out
$ clang-3.4 -O1 small.c; a.out
$
$ clang-trunk -O1 small.c
$ a.out
^C
$
--------------------
long long a;
void __assert_fail () __attribute__ ((__noreturn__));
int
main ()
{
for (a = -21; a < 9; a += 8)
if (!a)
__assert_fail ();
return 0;
}
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