[LLVMbugs] [Bug 15384] New: non-terminating loops at -O3 causes clang to hang

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=15384

            Bug ID: 15384
           Summary: non-terminating loops at -O3 causes clang to hang
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: LLVM Codegen
          Assignee: unassignedclangbugs at nondot.org
          Reporter: dhazeghi at yahoo.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

The following snippet (generated by csmith) causes top-of-trunk clang to get
stuck in an infinite loop.

$ clang-trunk -v
clang version 3.3 (trunk 176177)
Target: x86_64-pc-linux-gnu
Thread model: posix
$ cat crash18.c 
/* clang -O3 */

int a, b, c, d;
void static
fn1 (int *p1)
{
    for (;;)
    {
        *p1 = 1;
        for (; c; ++c)
        {
            int *e = &d;
            *e = *p1;
            b = 0;
            for (; b; b++)
                *p1 = *e = 0;
        }
    }
}

int main ()
{
    fn1 (&a);
}
$ clang -O2 crash18.c 
$ clang -O3 crash18.c 
<hangs>
$

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