[LLVMbugs] [Bug 6481] New: instcombine incorrectly generates undefs with icmp

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=6481

           Summary: instcombine incorrectly generates undefs with icmp
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: Scalar Optimizations
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: arplynn at gmail.com
                CC: llvmbugs at cs.uiuc.edu


Take the example of:

define i1 @cond() nounwind readnone {
entry:
        %cmp = icmp slt i8 undef, -128
        ret i1 %cmp
}

instcombine turns this into ret i1 undef. This is not valid: there is no i8
value for which the condition is true.

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