Index: llvm/trunk/lib/Target/Mips/MipsABIInfo.h
===================================================================
--- llvm/trunk/lib/Target/Mips/MipsABIInfo.h
+++ llvm/trunk/lib/Target/Mips/MipsABIInfo.h
@@ -38,8 +38,12 @@
   bool IsEABI() const { return ThisABI == ABI::EABI; }
   ABI GetEnumValue() const { return ThisABI; }
 
+  /// The registers to use for byval arguments.
   const ArrayRef<MCPhysReg> GetByValArgRegs() const;
 
+  /// The registers to use for the variable argument list.
+  const ArrayRef<MCPhysReg> GetVarArgRegs() const;
+
   /// Ordering of ABI's
   /// MipsGenSubtargetInfo.inc will use this to resolve conflicts when given
   /// multiple ABI options.
Index: llvm/trunk/lib/Target/Mips/MipsABIInfo.cpp
===================================================================
--- llvm/trunk/lib/Target/Mips/MipsABIInfo.cpp
+++ llvm/trunk/lib/Target/Mips/MipsABIInfo.cpp
@@ -27,3 +27,11 @@
     return makeArrayRef(Mips64IntRegs);
   llvm_unreachable("Unhandled ABI");
 }
+
+const ArrayRef<MCPhysReg> MipsABIInfo::GetVarArgRegs() const {
+  if (IsO32())
+    return makeArrayRef(O32IntRegs);
+  if (IsN32() || IsN64())
+    return makeArrayRef(Mips64IntRegs);
+  llvm_unreachable("Unhandled ABI");
+}
Index: llvm/trunk/lib/Target/Mips/MipsISelLowering.h
===================================================================
--- llvm/trunk/lib/Target/Mips/MipsISelLowering.h
+++ llvm/trunk/lib/Target/Mips/MipsISelLowering.h
@@ -367,9 +367,6 @@
       /// register arguments. This is 16-byte if ABI is O32.
       unsigned reservedArgArea() const;
 
-      /// Return pointer to array of integer argument registers.
-      const ArrayRef<MCPhysReg> intArgRegs() const;
-
     private:
       CallingConv::ID CallConv;
       const MipsSubtarget &Subtarget;
Index: llvm/trunk/lib/Target/Mips/MipsISelLowering.cpp
===================================================================
--- llvm/trunk/lib/Target/Mips/MipsISelLowering.cpp
+++ llvm/trunk/lib/Target/Mips/MipsISelLowering.cpp
@@ -3628,12 +3628,6 @@
   return (Subtarget.isABI_O32() && (CallConv != CallingConv::Fast)) ? 16 : 0;
 }
 
-const ArrayRef<MCPhysReg> MipsTargetLowering::MipsCC::intArgRegs() const {
-  if (Subtarget.isABI_O32())
-    return makeArrayRef(O32IntRegs);
-  return makeArrayRef(Mips64IntRegs);
-}
-
 void MipsTargetLowering::copyByValRegs(
     SDValue Chain, SDLoc DL, std::vector<SDValue> &OutChains, SelectionDAG &DAG,
     const ISD::ArgFlagsTy &Flags, SmallVectorImpl<SDValue> &InVals,
@@ -3646,11 +3640,11 @@
   unsigned RegAreaSize = NumRegs * GPRSizeInBytes;
   unsigned FrameObjSize = std::max(Flags.getByValSize(), RegAreaSize);
   int FrameObjOffset;
+  ArrayRef<MCPhysReg> ByValArgRegs = Subtarget.getABI().GetByValArgRegs();
 
   if (RegAreaSize)
-    FrameObjOffset =
-        (int)CC.reservedArgArea() -
-        (int)((CC.intArgRegs().size() - FirstReg) * GPRSizeInBytes);
+    FrameObjOffset = (int)CC.reservedArgArea() -
+                     (int)((ByValArgRegs.size() - FirstReg) * GPRSizeInBytes);
   else
     FrameObjOffset = VA.getLocMemOffset();
 
@@ -3668,7 +3662,7 @@
   const TargetRegisterClass *RC = getRegClassFor(RegTy);
 
   for (unsigned I = 0; I < NumRegs; ++I) {
-    unsigned ArgReg = CC.intArgRegs()[FirstReg + I];
+    unsigned ArgReg = ByValArgRegs[FirstReg + I];
     unsigned VReg = addLiveIn(MF, ArgReg, RC);
     unsigned Offset = I * GPRSizeInBytes;
     SDValue StorePtr = DAG.getNode(ISD::ADD, DL, PtrTy, FIN,
@@ -3696,7 +3690,7 @@
   unsigned NumRegs = LastReg - FirstReg;
 
   if (NumRegs) {
-    const ArrayRef<MCPhysReg> ArgRegs = CC.intArgRegs();
+    const ArrayRef<MCPhysReg> ArgRegs = Subtarget.getABI().GetByValArgRegs();
     bool LeftoverBytes = (NumRegs * RegSizeInBytes > ByValSizeInBytes);
     unsigned I = 0;
 
@@ -3779,7 +3773,7 @@
                                          const MipsCC &CC, SDValue Chain,
                                          SDLoc DL, SelectionDAG &DAG,
                                          CCState &State) const {
-  const ArrayRef<MCPhysReg> ArgRegs = CC.intArgRegs();
+  const ArrayRef<MCPhysReg> ArgRegs = Subtarget.getABI().GetVarArgRegs();
   unsigned Idx = State.getFirstUnallocated(ArgRegs.data(), ArgRegs.size());
   unsigned RegSizeInBytes = Subtarget.getGPRSizeInBytes();
   MVT RegTy = MVT::getIntegerVT(RegSizeInBytes * 8);