http://llvm.org/bugs/show_bug.cgi?id=5204

           Summary: if-conversion of tail blocks
           Product: new-bugs
           Version: trunk
          Platform: Macintosh
        OS/Version: MacOS X
            Status: NEW
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: [email protected]
        ReportedBy: [email protected]
                CC: [email protected]


In test/CodeGen/Thumb2/2009-10-15-ITBlockBranch.ll, there's a diamond-shaped
if-conversion at the end of the function. There is a BX_RET in each side of the
diamond that become LDM_RET. Since one branch only consists of this return and
no work, if-conversion should flip the comparison to avoid having run over the
predicated SUB.


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