[LLVMbugs] [Bug 673] NEW: Type inferencing bug necessitates redundant type cast on source operand

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=673

           Summary: Type inferencing bug necessitates redundant type cast on
                    source operand
           Product: tools
           Version: trunk
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: minor
          Priority: P2
         Component: TableGen
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: evan.cheng at apple.com


See X86InstrInfo.td:

  def OUT8ir  : Ii8<0xE6, RawFrm, (ops i8imm:$port),
                     "out{b} {%al, $port|$port, %AL}",
                     [(writeport (i8 AL), (i8 imm:$port))]>,
                     Imp<[AL], []>;

The i8 type cast on $port in the isel pattern is unnecessary since the operand
type of i8imm:$port is i8. However tblgen cannot infer this. If the type case is
removed, tblgen asserts "Could not infer all types in pattern!" during DAG isel
generation.



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