[LLVMbugs] [Bug 5107] New: Division by zero in SimpleRegisterCoalescing:: isWinToJoinCrossClass()

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=5107

           Summary: Division by zero in
                    SimpleRegisterCoalescing::isWinToJoinCrossClass()
           Product: libraries
           Version: 2.6
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: major
          Priority: P2
         Component: Backend: X86
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: DevOmem at web.de
                CC: llvmbugs at cs.uiuc.edu


Crash due to vivision by zero in
SimpleRegisterCoalescing::isWinToJoinCrossClass()

SmallSize can be some times zero and this will crash LLVM.

Solution for now is to add this 

if(LargeSize<=0) LargeSize=1;

if(SmallSize<=0) SmallSize=1;

before 

if (SmallSize > Threshold || LargeSize > Threshold)
    if ((float)std::distance(mri_->use_begin(SmallReg),mri_->use_end()) /
SmallSize <
        (float)std::distance(mri_->use_begin(LargeReg),mri_->use_end()) /
LargeSize)


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