[LLVMbugs] [Bug 15921] New: clang hangs at -O2 on infinite loop

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=15921

            Bug ID: 15921
           Summary: clang hangs at -O2 on infinite loop
           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 testcase causes current clang trunk to hang, when compiled at -O2
or higher optimization level.

$ clang -v
clang version 3.3 (trunk 181189)
Target: x86_64-pc-linux-gnu
Thread model: posix
$ clang -Os test.c
$ clang -O2 test.c
<hangs>
$ cat test.c

short a;
int b;
void fn1 (short *p1)
{
    b = 15;
    for (; b != -15; b = b - 1)
        a = *p1 * *p1;
}

int main ()
{
    for (;;)
        fn1 (&a);
    return 0;
}

-- 
You are receiving this mail because:
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-bugs/attachments/20130506/ebb1835c/attachment.html>