[LLVMbugs] [Bug 15748] New: clang hangs at -O3 on loop

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=15748

            Bug ID: 15748
           Summary: clang hangs at -O3 on 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 (generated by csmith) causes current clang trunk to hang
when compiling at -O3.

This does not appear to be the same as 15714, which was recently fixed.

$ clang -v
clang version 3.3 (trunk 179483)
Target: x86_64-pc-linux-gnu
Thread model: posix
$ clang -O2 -c try.c
$ clang -O3 -c try.c
^C

--------------

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

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