Subzero ARM: addProlog/addEpilogue -- share some code with x86.

src/IceTargetLoweringARM32.h

 //===- subzero/src/IceTargetLoweringARM32.h - ARM32 lowering ----*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file declares the TargetLoweringARM32 class, which implements the
@@ skipping 34 matching lines @@
   }
   bool hasFramePointer() const override { return UsesFramePointer; }
   SizeT getFrameOrStackReg() const override {
     return UsesFramePointer ? RegARM32::Reg_fp : RegARM32::Reg_sp;
   }
   size_t typeWidthInBytesOnStack(Type Ty) const override {
     // Round up to the next multiple of 4 bytes.  In particular, i1,
     // i8, and i16 are rounded up to 4 bytes.
     return (typeWidthInBytes(Ty) + 3) & ~3;
   }
+  size_t minStackSlotSizeLog2() const final { return 2; }
+  size_t maxStackSlotSizeLog2() const final { return 4; }
+
   void emitVariable(const Variable *Var) const override;
 
   const char *getConstantPrefix() const final { return "#"; }
   void emit(const ConstantUndef *C) const final;
   void emit(const ConstantInteger32 *C) const final;
   void emit(const ConstantInteger64 *C) const final;
   void emit(const ConstantFloat *C) const final;
   void emit(const ConstantDouble *C) const final;
 
   void lowerArguments() override;
   void addProlog(CfgNode *Node) override;
   void addEpilog(CfgNode *Node) override;
 
   // Ensure that a 64-bit Variable has been split into 2 32-bit
   // Variables, creating them if necessary.  This is needed for all
   // I64 operations.
   void split64(Variable *Var);
   Operand *loOperand(Operand *Operand);
   Operand *hiOperand(Operand *Operand);
+  void finishArgumentLowering(Variable *Arg, Variable *FramePtr,
+                              size_t BasicFrameOffset, size_t &InArgsSizeBytes);
 
 protected:
   explicit TargetARM32(Cfg *Func);
 
   void postLower() override;
 
   void lowerAlloca(const InstAlloca *Inst) override;
   void lowerArithmetic(const InstArithmetic *Inst) override;
   void lowerAssign(const InstAssign *Inst) override;
   void lowerBr(const InstBr *Inst) override;
@@ skipping 128 matching lines @@
     Context.insert(InstARM32Mul::create(Func, Dest, Src0, Src1, Pred));
   }
   void _mvn(Variable *Dest, Operand *Src0,
             CondARM32::Cond Pred = CondARM32::AL) {
     Context.insert(InstARM32Mvn::create(Func, Dest, Src0, Pred));
   }
   void _orr(Variable *Dest, Variable *Src0, Operand *Src1,
             CondARM32::Cond Pred = CondARM32::AL) {
     Context.insert(InstARM32Orr::create(Func, Dest, Src0, Src1, Pred));
   }
+  void _push(const VarList &Sources) {
+    Context.insert(InstARM32Push::create(Func, Sources));
+  }
+  void _pop(const VarList &Dests) {
+    Variable *First = Dests[0];
+    Context.insert(InstARM32Pop::create(Func, Dests));
+    // Mark other dests as modified.
+    for (size_t I = 1; I < Dests.size(); ++I) {
+      Context.insert(InstFakeDef::create(Func, Dests[I], First));
+    }
+  }
   void _sbc(Variable *Dest, Variable *Src0, Operand *Src1,
             CondARM32::Cond Pred = CondARM32::AL) {
     Context.insert(InstARM32Sbc::create(Func, Dest, Src0, Src1, Pred));
   }
   void _sbcs(Variable *Dest, Variable *Src0, Operand *Src1,
              CondARM32::Cond Pred = CondARM32::AL) {
     const bool SetFlags = true;
     Context.insert(
         InstARM32Sbc::create(Func, Dest, Src0, Src1, Pred, SetFlags));
   }
@@ skipping 14 matching lines @@
               Variable *Src1, CondARM32::Cond Pred = CondARM32::AL) {
     Context.insert(
         InstARM32Umull::create(Func, DestLo, DestHi, Src0, Src1, Pred));
     // Model the modification to the second dest as a fake def.
     // Note that the def is not predicated.
     Context.insert(InstFakeDef::create(Func, DestHi, DestLo));
   }
 
   bool UsesFramePointer;
   bool NeedsStackAlignment;
+  bool MaybeLeafFunc;
+  size_t SpillAreaSizeBytes;
   llvm::SmallBitVector TypeToRegisterSet[IceType_NUM];
   llvm::SmallBitVector ScratchRegs;
   llvm::SmallBitVector RegsUsed;
   VarList PhysicalRegisters[IceType_NUM];
   static IceString RegNames[];
 
 private:
   ~TargetARM32() override {}
 };
 
@@ skipping 15 matching lines @@
 
 private:
   void lowerGlobal(const VariableDeclaration &Var) const;
   ~TargetDataARM32() override {}
   template <typename T> static void emitConstantPool(GlobalContext *Ctx);
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETARGETLOWERINGARM32_H