Vector ICs: Like megamorphic keyed koads, use a dummy vector for stores

src/ic/x64/ic-x64.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/codegen.h"
 #include "src/ic/ic.h"
@@ skipping 322 matching lines @@
   __ j(equal, &probe_dictionary);
 
   Register megamorphic_scratch = rdi;
   // The handlers in the stub cache expect a vector and slot. Since we won't
   // change the IC from any downstream misses, a dummy vector can be used.
   Register vector = LoadWithVectorDescriptor::VectorRegister();
   Register slot = LoadDescriptor::SlotRegister();
   DCHECK(!AreAliased(megamorphic_scratch, vector, slot));
   Handle<TypeFeedbackVector> dummy_vector = Handle<TypeFeedbackVector>::cast(
       masm->isolate()->factory()->keyed_load_dummy_vector());
-  int int_slot = dummy_vector->GetIndex(FeedbackVectorICSlot(0));
+  int slot_index = dummy_vector->GetIndex(FeedbackVectorICSlot(0));
   __ Move(vector, dummy_vector);
-  __ Move(slot, Smi::FromInt(int_slot));
+  __ Move(slot, Smi::FromInt(slot_index));
 
   Code::Flags flags = Code::RemoveTypeAndHolderFromFlags(
       Code::ComputeHandlerFlags(Code::LOAD_IC));
   masm->isolate()->stub_cache()->GenerateProbe(masm, Code::KEYED_LOAD_IC, flags,
                                                false, receiver, key,
                                                megamorphic_scratch, no_reg);
   // Cache miss.
   GenerateMiss(masm);
 
   // Do a quick inline probe of the receiver's dictionary, if it
@@ skipping 193 matching lines @@
   __ bind(&slow);
   __ Integer32ToSmi(key, key);
   __ bind(&slow_with_tagged_index);
   PropertyICCompiler::GenerateRuntimeSetProperty(masm, language_mode);
   // Never returns to here.
 
   __ bind(&maybe_name_key);
   __ movp(r9, FieldOperand(key, HeapObject::kMapOffset));
   __ movzxbp(r9, FieldOperand(r9, Map::kInstanceTypeOffset));
   __ JumpIfNotUniqueNameInstanceType(r9, &slow_with_tagged_index);
+
+  if (FLAG_vector_stores) {
+    Register vector = VectorStoreICDescriptor::VectorRegister();
+    Register slot = VectorStoreICDescriptor::SlotRegister();
+    // The handlers in the stub cache expect a vector and slot. Since we won't
+    // change the IC from any downstream misses, a dummy vector can be used.
+    Handle<TypeFeedbackVector> dummy_vector = Handle<TypeFeedbackVector>::cast(
+        masm->isolate()->factory()->keyed_store_dummy_vector());
+    int slot_index = dummy_vector->GetIndex(FeedbackVectorICSlot(0));
+    __ Move(vector, dummy_vector);
+    __ Move(slot, Smi::FromInt(slot_index));
+  }
+
   Code::Flags flags = Code::RemoveTypeAndHolderFromFlags(
       Code::ComputeHandlerFlags(Code::STORE_IC));
   masm->isolate()->stub_cache()->GenerateProbe(
       masm, Code::STORE_IC, flags, false, receiver, key, rbx, no_reg);
   // Cache miss.
   __ jmp(&miss);
 
   // Extra capacity case: Check if there is extra capacity to
   // perform the store and update the length. Used for adding one
   // element to the array by writing to array[array.length].
@@ skipping 277 matching lines @@
   Condition cc =
       (check == ENABLE_INLINED_SMI_CHECK)
           ? (*jmp_address == Assembler::kJncShortOpcode ? not_zero : zero)
           : (*jmp_address == Assembler::kJnzShortOpcode ? not_carry : carry);
   *jmp_address = static_cast<byte>(Assembler::kJccShortPrefix | cc);
 }
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64