[AArch64] Remove unused MC function

[samparker]

Summary

An unused function warning was raised in https://bugs.llvm.org/show_bug.cgi?id=34178. The offending function, in AArch64MCCodeEmitter.cpp, was committed by me last week.

[fhahn]

LGTM. It's not used at the moment and should be removed.

llvm/trunk/lib/Target/AArch64/MCTargetDesc/AArch64MCCodeEmitter.cpp

uint32_t getAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
                               const MCSubtargetInfo &STI) const;
 
   /// getAddSubImmOpValue - Return encoding for the 12-bit immediate value and
   /// the 2-bit shift field.
   uint32_t getAddSubImmOpValue(const MCInst &MI, unsigned OpIdx,
                                SmallVectorImpl<MCFixup> &Fixups,
                                const MCSubtargetInfo &STI) const;
 
-  /// getAuthSImmOpValue - Return encoding for a 10-bit immediate which is
-  /// encoded as a sign bit and an 9-bit immediate, separated by a single bit.
-  uint32_t getAuthSImmOpValue(const MCInst &MI, unsigned OpIdx,
-                              SmallVectorImpl<MCFixup> &Fixups,
-                              const MCSubtargetInfo &STI) const;
-
   /// getCondBranchTargetOpValue - Return the encoded value for a conditional
   /// branch target.
   uint32_t getCondBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
                                       SmallVectorImpl<MCFixup> &Fixups,
                                       const MCSubtargetInfo &STI) const;
 
   /// getLoadLiteralOpValue - Return the encoded value for a load-literal
   /// pc-relative address.
if (const AArch64MCExpr *A64E = dyn_cast<AArch64MCExpr>(Expr)) {
     AArch64MCExpr::VariantKind RefKind = A64E->getKind();
     if (RefKind == AArch64MCExpr::VK_TPREL_HI12 ||
         RefKind == AArch64MCExpr::VK_DTPREL_HI12)
       ShiftVal = 12;
   }
   return ShiftVal == 0 ? 0 : (1 << ShiftVal);
 }
 
-/// getAuthSImmOpValue - encode a 10-bit scale signed immediate within an 11-bit
-/// field in which bit 10 of that field is not used to encode any information
-/// about the immediate.
-uint32_t
-AArch64MCCodeEmitter::getAuthSImmOpValue(const MCInst &MI, unsigned OpIdx,
-                                         SmallVectorImpl<MCFixup> &Fixups,
-                                         const MCSubtargetInfo &STI) const {
-  const MCOperand &MO = MI.getOperand(OpIdx);
-  int32_t offset = MO.getImm();
-  return (uint32_t)offset;
-}
-
 /// getCondBranchTargetOpValue - Return the encoded value for a conditional
 /// branch target.
 uint32_t AArch64MCCodeEmitter::getCondBranchTargetOpValue(
     const MCInst &MI, unsigned OpIdx, SmallVectorImpl<MCFixup> &Fixups,
     const MCSubtargetInfo &STI) const {
   const MCOperand &MO = MI.getOperand(OpIdx);
 
   // If the destination is an immediate, we have nothing to do.