MIPS: Replace HCheckPrototypeMaps by explicit map checks of constant values.

src/mips/lithium-codegen-mips.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 5254 matching lines @@
   __ ClampDoubleToUint8(result_reg, double_scratch0(), temp_reg);
   __ jmp(&done);
 
   __ bind(&is_smi);
   __ ClampUint8(result_reg, scratch);
 
   __ bind(&done);
 }
 
 
-void LCodeGen::DoCheckPrototypeMaps(LCheckPrototypeMaps* instr) {
-  if (instr->hydrogen()->CanOmitPrototypeChecks()) return;
-
-  Register prototype_reg = ToRegister(instr->temp());
-  Register map_reg = ToRegister(instr->temp2());
-
-  ZoneList<Handle<JSObject> >* prototypes = instr->prototypes();
-  ZoneList<Handle<Map> >* maps = instr->maps();
-
-  ASSERT(prototypes->length() == maps->length());
-
-  for (int i = 0; i < prototypes->length(); i++) {
-    __ LoadHeapObject(prototype_reg, prototypes->at(i));
-    __ lw(map_reg, FieldMemOperand(prototype_reg, HeapObject::kMapOffset));
-    DoCheckMapCommon(map_reg, maps->at(i), instr->environment());
-  }
-}
-
-
 void LCodeGen::DoAllocate(LAllocate* instr) {
   class DeferredAllocate: public LDeferredCode {
    public:
     DeferredAllocate(LCodeGen* codegen, LAllocate* instr)
         : LDeferredCode(codegen), instr_(instr) { }
     virtual void Generate() { codegen()->DoDeferredAllocate(instr_); }
     virtual LInstruction* instr() { return instr_; }
    private:
     LAllocate* instr_;
   };
@@ skipping 538 matching lines @@
   __ Subu(scratch, result, scratch);
   __ lw(result, FieldMemOperand(scratch,
                                 FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal