Always require exact maps.

src/arm/lithium-codegen-arm.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 3129 matching lines @@
     DeoptimizeIf(al, instr->environment());
     return;
   }
   Handle<String> name = instr->hydrogen()->name();
   Label done;
   __ ldr(object_map, FieldMemOperand(object, HeapObject::kMapOffset));
   for (int i = 0; i < map_count; ++i) {
     bool last = (i == map_count - 1);
     Handle<Map> map = instr->hydrogen()->types()->at(i);
     Label check_passed;
-    __ CompareMap(
-        object_map, map, &check_passed, ALLOW_ELEMENT_TRANSITION_MAPS);
+    __ CompareMap(object_map, map, &check_passed);
     if (last && !need_generic) {
       DeoptimizeIf(ne, instr->environment());
       __ bind(&check_passed);
       EmitLoadFieldOrConstantFunction(
           result, object, map, name, instr->environment());
     } else {
       Label next;
       __ b(ne, &next);
       __ bind(&check_passed);
       EmitLoadFieldOrConstantFunction(
@@ skipping 2099 matching lines @@
     __ cmp(reg, ip);
   } else {
     __ cmp(reg, Operand(target));
   }
   DeoptimizeIf(ne, instr->environment());
 }
 
 
 void LCodeGen::DoCheckMapCommon(Register map_reg,
                                 Handle<Map> map,
-                                CompareMapMode mode,
                                 LEnvironment* env) {
   Label success;
-  __ CompareMap(map_reg, map, &success, mode);
+  __ CompareMap(map_reg, map, &success);
   DeoptimizeIf(ne, env);
   __ bind(&success);
 }
 
 
 void LCodeGen::DoCheckMaps(LCheckMaps* instr) {
   Register map_reg = scratch0();
   LOperand* input = instr->value();
   ASSERT(input->IsRegister());
   Register reg = ToRegister(input);
 
   Label success;
   SmallMapList* map_set = instr->hydrogen()->map_set();
   __ ldr(map_reg, FieldMemOperand(reg, HeapObject::kMapOffset));
   for (int i = 0; i < map_set->length() - 1; i++) {
     Handle<Map> map = map_set->at(i);
-    __ CompareMap(map_reg, map, &success, REQUIRE_EXACT_MAP);
+    __ CompareMap(map_reg, map, &success);
     __ b(eq, &success);
   }
   Handle<Map> map = map_set->last();
-  DoCheckMapCommon(map_reg, map, REQUIRE_EXACT_MAP, instr->environment());
+  DoCheckMapCommon(map_reg, map, instr->environment());
   __ bind(&success);
 }
 
 
 void LCodeGen::DoClampDToUint8(LClampDToUint8* instr) {
   DwVfpRegister value_reg = ToDoubleRegister(instr->unclamped());
   Register result_reg = ToRegister(instr->result());
   DwVfpRegister temp_reg = ToDoubleRegister(instr->temp());
   __ ClampDoubleToUint8(result_reg, value_reg, temp_reg);
 }
@@ skipping 53 matching lines @@
   ASSERT(prototypes->length() == maps->length());
 
   if (instr->hydrogen()->CanOmitPrototypeChecks()) {
     for (int i = 0; i < maps->length(); i++) {
       prototype_maps_.Add(maps->at(i), info()->zone());
     }
   } else {
     for (int i = 0; i < prototypes->length(); i++) {
       __ LoadHeapObject(prototype_reg, prototypes->at(i));
       __ ldr(map_reg, FieldMemOperand(prototype_reg, HeapObject::kMapOffset));
-      DoCheckMapCommon(map_reg,
-                       maps->at(i),
-                       ALLOW_ELEMENT_TRANSITION_MAPS,
-                       instr->environment());
+      DoCheckMapCommon(map_reg, maps->at(i), instr->environment());
     }
   }
 }
 
 
 void LCodeGen::DoAllocateObject(LAllocateObject* instr) {
   class DeferredAllocateObject: public LDeferredCode {
    public:
     DeferredAllocateObject(LCodeGen* codegen, LAllocateObject* instr)
         : LDeferredCode(codegen), instr_(instr) { }
@@ skipping 659 matching lines @@
   __ sub(scratch, result, Operand(index, LSL, kPointerSizeLog2 - kSmiTagSize));
   __ ldr(result, FieldMemOperand(scratch,
                                  FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal