Modify polymorphic keyed load IC stub to load cached properties from the...

Modify polymorphic keyed load IC stub to load cached properties from the property array of a fast-case JSObject.
Review URL: http://codereview.chromium.org/3053042

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5175 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/arm/ic-arm.cc

@@ -1105,7 +1105,7 @@ void KeyedLoadIC::GenerateGeneric(MacroAssembler* masm) {
   //  -- r0     : key
   //  -- r1     : receiver
   // -----------------------------------
-  Label slow, check_string, index_smi, index_string;
+  Label slow, check_string, index_smi, index_string, property_array_property;
   Label check_pixel_array, probe_dictionary, check_number_dictionary;
 
   Register key = r0;
@@ -1193,7 +1193,7 @@ void KeyedLoadIC::GenerateGeneric(MacroAssembler* masm) {
   __ cmp(r0, r5);
   __ b(ne, &slow);
 
-  // Get field offset and check that it is an in-object property.
+  // Get field offset.
   // r0     : key
   // r1     : receiver
   // r2     : receiver's map
@@ -1203,11 +1203,10 @@ void KeyedLoadIC::GenerateGeneric(MacroAssembler* masm) {
   __ mov(r4, Operand(cache_field_offsets));
   __ ldr(r5, MemOperand(r4, r3, LSL, kPointerSizeLog2));
   __ ldrb(r6, FieldMemOperand(r2, Map::kInObjectPropertiesOffset));
-  __ cmp(r5, r6);
-  __ b(ge, &slow);
+  __ sub(r5, r5, r6, SetCC);
+  __ b(ge, &property_array_property);
 
   // Load in-object property.
-  __ sub(r5, r5, r6);  // Index from end of object.
   __ ldrb(r6, FieldMemOperand(r2, Map::kInstanceSizeOffset));
   __ add(r6, r6, r5);  // Index from start of object.
   __ sub(r1, r1, Operand(kHeapObjectTag));  // Remove the heap tag.
@@ -1215,6 +1214,14 @@ void KeyedLoadIC::GenerateGeneric(MacroAssembler* masm) {
   __ IncrementCounter(&Counters::keyed_load_generic_lookup_cache, 1, r2, r3);
   __ Ret();
 
+  // Load property array property.
+  __ bind(&property_array_property);
+  __ ldr(r1, FieldMemOperand(r1, JSObject::kPropertiesOffset));
+  __ add(r1, r1, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
+  __ ldr(r0, MemOperand(r1, r5, LSL, kPointerSizeLog2));
+  __ IncrementCounter(&Counters::keyed_load_generic_lookup_cache, 1, r2, r3);
+  __ Ret();
+
   // Do a quick inline probe of the receiver's dictionary, if it
   // exists.
   __ bind(&probe_dictionary);

src/ia32/ic-ia32.cc

@@ -545,7 +545,7 @@ void KeyedLoadIC::GenerateGeneric(MacroAssembler* masm) {
   //  -- edx    : receiver
   //  -- esp[0] : return address
   // -----------------------------------
-  Label slow, check_string, index_smi, index_string;
+  Label slow, check_string, index_smi, index_string, property_array_property;
   Label check_pixel_array, probe_dictionary, check_number_dictionary;
 
   // Check that the key is a smi.
@@ -652,7 +652,7 @@ void KeyedLoadIC::GenerateGeneric(MacroAssembler* masm) {
   __ cmp(eax, Operand::StaticArray(edi, times_1, cache_keys));
   __ j(not_equal, &slow);
 
-  // Get field offset and check that it is an in-object property.
+  // Get field offset.
   // edx     : receiver
   // ebx     : receiver's map
   // eax     : key
@@ -663,7 +663,7 @@ void KeyedLoadIC::GenerateGeneric(MacroAssembler* masm) {
          Operand::StaticArray(ecx, times_pointer_size, cache_field_offsets));
   __ movzx_b(ecx, FieldOperand(ebx, Map::kInObjectPropertiesOffset));
   __ sub(edi, Operand(ecx));
-  __ j(above_equal, &slow);
+  __ j(above_equal, &property_array_property);
 
   // Load in-object property.
   __ movzx_b(ecx, FieldOperand(ebx, Map::kInstanceSizeOffset));
@@ -672,6 +672,14 @@ void KeyedLoadIC::GenerateGeneric(MacroAssembler* masm) {
   __ IncrementCounter(&Counters::keyed_load_generic_lookup_cache, 1);
   __ ret(0);
 
+  // Load property array property.
+  __ bind(&property_array_property);
+  __ mov(eax, FieldOperand(edx, JSObject::kPropertiesOffset));
+  __ mov(eax, FieldOperand(eax, edi, times_pointer_size,
+                           FixedArray::kHeaderSize));
+  __ IncrementCounter(&Counters::keyed_load_generic_lookup_cache, 1);
+  __ ret(0);
+
   // Do a quick inline probe of the receiver's dictionary, if it
   // exists.
   __ bind(&probe_dictionary);

src/x64/ic-x64.cc

@@ -599,7 +599,7 @@ void KeyedLoadIC::GenerateGeneric(MacroAssembler* masm) {
   //  -- rdx    : receiver
   //  -- rsp[0] : return address
   // -----------------------------------
-  Label slow, check_string, index_smi, index_string;
+  Label slow, check_string, index_smi, index_string, property_array_property;
   Label check_pixel_array, probe_dictionary, check_number_dictionary;
 
   // Check that the key is a smi.
@@ -692,15 +692,14 @@ void KeyedLoadIC::GenerateGeneric(MacroAssembler* masm) {
   __ cmpq(rax, Operand(kScratchRegister, rdi, times_1, kPointerSize));
   __ j(not_equal, &slow);
 
-  // Get field offset which is a 32-bit integer and check that it is
-  // an in-object property.
+  // Get field offset, which is a 32-bit integer.
   ExternalReference cache_field_offsets
       = ExternalReference::keyed_lookup_cache_field_offsets();
   __ movq(kScratchRegister, cache_field_offsets);
   __ movl(rdi, Operand(kScratchRegister, rcx, times_4, 0));
   __ movzxbq(rcx, FieldOperand(rbx, Map::kInObjectPropertiesOffset));
   __ subq(rdi, rcx);
-  __ j(above_equal, &slow);
+  __ j(above_equal, &property_array_property);
 
   // Load in-object property.
   __ movzxbq(rcx, FieldOperand(rbx, Map::kInstanceSizeOffset));
@@ -709,6 +708,14 @@ void KeyedLoadIC::GenerateGeneric(MacroAssembler* masm) {
   __ IncrementCounter(&Counters::keyed_load_generic_lookup_cache, 1);
   __ ret(0);
 
+  // Load property array property.
+  __ bind(&property_array_property);
+  __ movq(rax, FieldOperand(rdx, JSObject::kPropertiesOffset));
+  __ movq(rax, FieldOperand(rax, rdi, times_pointer_size,
+                            FixedArray::kHeaderSize));
+  __ IncrementCounter(&Counters::keyed_load_generic_lookup_cache, 1);
+  __ ret(0);
+
   // Do a quick inline probe of the receiver's dictionary, if it
   // exists.
   __ bind(&probe_dictionary);