[LLVMbugs] [Bug 1563] NEW: BitVector::resize does not initialize all new bits

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=1563

           Summary: BitVector::resize does not initialize all new bits
           Product: new-bugs
           Version: unspecified
          Platform: Macintosh
        OS/Version: MacOS X
            Status: NEW
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: resistor at mac.com
                CC: evan.cheng at apple.com


When resizing a BitVector that does not cause new allocations (say, resizing from 16 to 20 bits), 
BitVector::resize fails to initial the four bits that are now being used.  This can lead to inappropriate 
behavior, and is preventing GVNPRE from using BitVectors are aggressively as would be possible.



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