--- a/lib/Target/Mips/MipsMachineFunction.h	Tue Oct 13 17:49:56 2015 +0900
+++ b/lib/Target/Mips/MipsMachineFunction.h	Tue Jan 26 22:53:40 2016 +0900
@@ -34,7 +34,7 @@
 public:
   MipsFunctionInfo(MachineFunction &MF)
       : MF(MF), SRetReturnReg(0), GlobalBaseReg(0), Mips16SPAliasReg(0),
-        VarArgsFrameIndex(0), CallsEhReturn(false), SaveS2(false),
+        VarArgsFrameIndex(0), CallsEhReturn(false), IsISR(false), SaveS2(false),
         MoveF64ViaSpillFI(-1) {}
 
   ~MipsFunctionInfo();
@@ -70,6 +70,14 @@
   /// object representing a GOT entry for an external function.
   MachinePointerInfo callPtrInfo(const char *ES);
 
+  // Functions with the "interrupt" attribute require special prologues,
+  // epilogues and additional spill slots.
+  bool isISR() const { return IsISR; }
+  void setISR() { IsISR = true; }
+  void createISRRegFI();
+  int getISRRegFI(unsigned Reg) const { return ISRDataRegFI[Reg]; }
+  bool isISRRegFI(int FI) const;
+
   /// Create a MachinePointerInfo that has a GlobalValuePseudoSourceValue object
   /// representing a GOT entry for a global function.
   MachinePointerInfo callPtrInfo(const GlobalValue *GV);
@@ -116,6 +124,12 @@
   /// Frame objects for spilling eh data registers.
   int EhDataRegFI[4];
 
+  /// ISR - Whether the function is an Interrupt Service Routine.
+  bool IsISR;
+
+  /// Frame objects for spilling C0_STATUS, C0_EPC
+  int ISRDataRegFI[2];
+
   // saveS2
   bool SaveS2;