[LLVMbugs] [Bug 7618] New: miscompile with optimization (derived from ffmpeg)

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=7618

           Summary: miscompile with optimization (derived from ffmpeg)
           Product: new-bugs
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: sharparrow1 at yahoo.com
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=5204)
 --> (http://llvm.org/bugs/attachment.cgi?id=5204)
Testcase

Testcase attached.  To reproduce, run the following on x86-64 Linux:

$ clang tester.c -O3
$ ./a.out
Segmentation fault
$ clang tester.c
$ ./a.out
0028004800280028002800280028ffffffe0002b0000000000280028002800280028ffffffe0002b
0028002800000000ffffffff00000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000
$ gcc tester.c -O3 -std=c99
$ ./a.out
0028004800280028002800280028ffffffe0002b0000000000280028002800280028ffffffe0002b0028002800000000ffffffff00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

I'm not sure how to go about finding the issue here...

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