[LLVMbugs] [Bug 2378] New: likely volatile bug

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=2378

           Summary: likely volatile bug
           Product: new-bugs
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: regehr at cs.utah.edu
                CC: llvmbugs at cs.uiuc.edu


This behavior is observed for svn 51560 for x86-32 on Ubuntu Feisty.

At -O0, -Os, and -O3 the attached program accesses volatile g_31 zero times. 
At -O1 and -O2 it reads from g_31 three times.

The full command line I'm using is

  llvm-gcc -fwrapv -O1 -g small.c

The problem is: I can't reduce this input any further without making the
behavior go away.  Since you have different (and hopefully better) testcase
reduction infrastructure, perhaps you'll have better luck.


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