Lazily save double registers for HCallRuntime instructions within Hydrogen code stubs.

src/x64/macro-assembler-x64.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 587 matching lines @@
   // hash: key's hash field, including its array index value.
   and_(hash, Immediate(String::kArrayIndexValueMask));
   shr(hash, Immediate(String::kHashShift));
   // Here we actually clobber the key which will be used if calling into
   // runtime later. However as the new key is the numeric value of a string key
   // there is no difference in using either key.
   Integer32ToSmi(index, hash);
 }
 
 
-void MacroAssembler::CallRuntime(Runtime::FunctionId id, int num_arguments) {
-  CallRuntime(Runtime::FunctionForId(id), num_arguments);
-}
-
-
-void MacroAssembler::CallRuntimeSaveDoubles(Runtime::FunctionId id) {
-  const Runtime::Function* function = Runtime::FunctionForId(id);
-  Set(rax, function->nargs);
-  LoadAddress(rbx, ExternalReference(function, isolate()));
-  CEntryStub ces(1, kSaveFPRegs);
-  CallStub(&ces);
-}
-
-
 void MacroAssembler::CallRuntime(const Runtime::Function* f,
-                                 int num_arguments) {
+                                 int num_arguments,
+                                 SaveFPRegsMode save_doubles) {
   // If the expected number of arguments of the runtime function is
   // constant, we check that the actual number of arguments match the
   // expectation.
   if (f->nargs >= 0 && f->nargs != num_arguments) {
     IllegalOperation(num_arguments);
     return;
   }
 
   // TODO(1236192): Most runtime routines don't need the number of
   // arguments passed in because it is constant. At some point we
   // should remove this need and make the runtime routine entry code
   // smarter.
   Set(rax, num_arguments);
   LoadAddress(rbx, ExternalReference(f, isolate()));
-  CEntryStub ces(f->result_size);
+  CEntryStub ces(f->result_size, save_doubles);
   CallStub(&ces);
 }
 
 
 void MacroAssembler::CallExternalReference(const ExternalReference& ext,
                                            int num_arguments) {
   Set(rax, num_arguments);
   LoadAddress(rbx, ext);
 
   CEntryStub stub(1);
@@ skipping 4268 matching lines @@
   j(greater, &no_memento_available);
   CompareRoot(MemOperand(scratch_reg, -AllocationMemento::kSize),
               Heap::kAllocationMementoMapRootIndex);
   bind(&no_memento_available);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64