Use the same registers for StoreIC and KeyedStoreIC.

src/arm64/stub-cache-arm64.cc

 // Copyright 2013 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_ARM64
 
 #include "src/codegen.h"
 #include "src/ic-inl.h"
@@ skipping 1258 matching lines @@
 Register* StoreStubCompiler::registers() {
   // receiver, value, scratch1, scratch2, scratch3.
   Register receiver = StoreIC::ReceiverRegister();
   Register name = StoreIC::NameRegister();
   static Register registers[] = { receiver, name, x3, x4, x5 };
   return registers;
 }
 
 
 Register* KeyedStoreStubCompiler::registers() {
-  // receiver, name, scratch1, scratch2, scratch3.
+  // receiver, name, scratch1/map, scratch2, scratch3.
   Register receiver = KeyedStoreIC::ReceiverRegister();
   Register name = KeyedStoreIC::NameRegister();
-  static Register registers[] = { receiver, name, x3, x4, x5 };
+  Register map = KeyedStoreIC::MapRegister();
+  static Register registers[] = { receiver, name, map, x4, x5 };
   return registers;
 }
 
 
 #undef __
 #define __ ACCESS_MASM(masm)
 
 void LoadStubCompiler::GenerateLoadViaGetter(MacroAssembler* masm,
                                              Handle<HeapType> type,
                                              Register receiver,
@@ skipping 70 matching lines @@
 
   if (check == PROPERTY &&
       (kind() == Code::KEYED_LOAD_IC || kind() == Code::KEYED_STORE_IC)) {
     __ CompareAndBranch(this->name(), Operand(name), ne, &miss);
   }
 
   Label number_case;
   Label* smi_target = IncludesNumberType(types) ? &number_case : &miss;
   __ JumpIfSmi(receiver(), smi_target);
 
+  // Polymorphic keyed stores may use the map register
   Register map_reg = scratch1();
+  ASSERT(kind() != Code::KEYED_STORE_IC ||
+         map_reg.is(KeyedStoreIC::MapRegister()));
   __ Ldr(map_reg, FieldMemOperand(receiver(), HeapObject::kMapOffset));
   int receiver_count = types->length();
   int number_of_handled_maps = 0;
   for (int current = 0; current < receiver_count; ++current) {
     Handle<HeapType> type = types->at(current);
     Handle<Map> map = IC::TypeToMap(*type, isolate());
     if (!map->is_deprecated()) {
       number_of_handled_maps++;
       Label try_next;
       __ Cmp(map_reg, Operand(map));
@@ skipping 89 matching lines @@
 
   // Miss case, call the runtime.
   __ Bind(&miss);
   TailCallBuiltin(masm, Builtins::kKeyedLoadIC_Miss);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM64