Subzero: Improve handling of alloca instructions of constant size.

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.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 92 matching lines @@
   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;
 
   Operand *loOperand(Operand *Operand);
   Operand *hiOperand(Operand *Operand);
   void finishArgumentLowering(Variable *Arg, Variable *FramePtr,
-                              size_t BasicFrameOffset, size_t &InArgsSizeBytes);
+                              size_t BasicFrameOffset, size_t StackAdjBytes,

[John, 2015/09/23 15:28:59]

What's the point of the ARM changes? you're passing an extra parameter, but it
seems you're not using it?... maybe revert and backport this later?

[Jim Stichnoth, 2015/09/23 20:17:01]

Good point - for some reason I thought finishArgumentLowering() was virtual and
I needed to change the signature everywhere.  Reverted.

+                              size_t &InArgsSizeBytes);
 
   bool hasCPUFeature(TargetARM32Features::ARM32InstructionSet I) const {
     return CPUFeatures.hasFeature(I);
   }
   Operand *legalizeUndef(Operand *From, int32_t RegNum = Variable::NoRegister);
 
 protected:
   explicit TargetARM32(Cfg *Func);
 
   void postLower() override;
@@ skipping 435 matching lines @@
 
 private:
   ~TargetHeaderARM32() = default;
 
   TargetARM32Features CPUFeatures;
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETARGETLOWERINGARM32_H