[Subzero][MIPS32] Implements addEpilog for MIPS32

src/IceTargetLoweringMIPS32.h

 //===- subzero/src/IceTargetLoweringMIPS32.h - MIPS32 lowering ---*- C++-*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 216 matching lines @@
   }
 
   void _divu(Variable *Dest, Variable *Src0, Variable *Src1) {
     Context.insert<InstMIPS32Divu>(Dest, Src0, Src1);
   }
 
   void _ldc1(Variable *Value, OperandMIPS32Mem *Mem) {
     Context.insert<InstMIPS32Ldc1>(Value, Mem);
   }
 
+  void _lw(Variable *Value, OperandMIPS32Mem *Mem) {
+    Context.insert<InstMIPS32Lw>(Value, Mem);
+  }
+
   void _lwc1(Variable *Value, OperandMIPS32Mem *Mem) {
     Context.insert<InstMIPS32Lwc1>(Value, Mem);
   }
 
   void _lui(Variable *Dest, uint32_t Imm) {
     Context.insert<InstMIPS32Lui>(Dest, Imm);
   }
 
   void _mov(Variable *Dest, Operand *Src0) {
     assert(Dest != nullptr);
@@ skipping 301 matching lines @@
                                 const SmallBitVector &ExcludeRegisters,
                                 uint64_t Salt) const override;
 
   OperandMIPS32Mem *formMemoryOperand(Operand *Ptr, Type Ty);
 
   bool UsesFramePointer = false;
   bool NeedsStackAlignment = false;
   bool MaybeLeafFunc = true;
   bool PrologEmitsFixedAllocas = false;
   uint32_t MaxOutArgsSizeBytes = 0;
+  uint32_t TotalStackSizeBytes = 0;
   static SmallBitVector TypeToRegisterSet[RCMIPS32_NUM];
   static SmallBitVector TypeToRegisterSetUnfiltered[RCMIPS32_NUM];
   static SmallBitVector RegisterAliases[RegMIPS32::Reg_NUM];
   SmallBitVector RegsUsed;
   VarList PhysicalRegisters[IceType_NUM];
   VarList PreservedGPRs;
   static constexpr uint32_t CHAR_BITS = 8;
   static constexpr uint32_t INT32_BITS = 32;
   size_t SpillAreaSizeBytes = 0;
   size_t FixedAllocaSizeBytes = 0;
   size_t FixedAllocaAlignBytes = 0;
+  size_t PreservedRegsSizeBytes = 0;
 
 private:
   ENABLE_MAKE_UNIQUE;
 
   class ComputationTracker {
   public:
     ComputationTracker() = default;
     ~ComputationTracker() = default;
 
     void forgetProducers() { KnownComputations.clear(); }
@@ skipping 91 matching lines @@
   explicit TargetHeaderMIPS32(GlobalContext *Ctx);
 
 private:
   ~TargetHeaderMIPS32() = default;
 };
 
 } // end of namespace MIPS32
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETARGETLOWERINGMIPS32_H