[LLVMbugs] [Bug 14574] New: Loop Vectorizer: Miscompile of gperftools (common.cc)

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=14574

             Bug #: 14574
           Summary: Loop Vectorizer: Miscompile of gperftools (common.cc)
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Core LLVM classes
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: nrotem at apple.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


The LoopVectorizer miscompiles this loop in gperftools:

 for (size_t cl = 1; cl  < kNumClasses; ++cl) {
    num_objects_to_move_[cl] = NumMoveSize(ByteSizeForClass(cl));
  }

I suspect that there is a bug in the if-conversion of "NumMoveSize".

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