ARM64: Optimize AllocateHeapNumber to use STP.

src/arm64/macro-assembler-arm64.h

 // Copyright 2013 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 784 matching lines @@
   //
   // This method asserts that StackPointer() is not csp, since the call does
   // not make sense in that context.
   inline void BumpSystemStackPointer(const Operand& space);
 
   // Helpers ------------------------------------------------------------------
   // Root register.
   inline void InitializeRootRegister();
 
   // Load an object from the root table.
-  void LoadRoot(Register destination,
+  void LoadRoot(CPURegister destination,
                 Heap::RootListIndex index);
   // Store an object to the root table.
   void StoreRoot(Register source,
                  Heap::RootListIndex index);
 
   // Load both TrueValue and FalseValue roots.
   void LoadTrueFalseRoots(Register true_root, Register false_root);
 
   void LoadHeapObject(Register dst, Handle<HeapObject> object);
 
@@ skipping 60 matching lines @@
                                  Register value2,
                                  Label* not_smi_label);
   inline void JumpIfBothNotSmi(Register value1,
                                Register value2,
                                Label* not_smi_label);
 
   // Abort execution if argument is a smi, enabled via --debug-code.
   void AssertNotSmi(Register object, BailoutReason reason = kOperandIsASmi);
   void AssertSmi(Register object, BailoutReason reason = kOperandIsNotASmi);
 
+  inline void ObjectTag(Register tagged_obj, Register obj);
+  inline void ObjectUntag(Register untagged_obj, Register obj);
+
   // Abort execution if argument is not a name, enabled via --debug-code.
   void AssertName(Register object);
 
   // Abort execution if argument is not undefined or an AllocationSite, enabled
   // via --debug-code.
   void AssertUndefinedOrAllocationSite(Register object, Register scratch);
 
   // Abort execution if argument is not a string, enabled via --debug-code.
   void AssertString(Register object);
 
@@ skipping 451 matching lines @@
 
   // Allocates a heap number or jumps to the gc_required label if the young
   // space is full and a scavenge is needed.
   // All registers are clobbered.
   // If no heap_number_map register is provided, the function will take care of
   // loading it.
   void AllocateHeapNumber(Register result,
                           Label* gc_required,
                           Register scratch1,
                           Register scratch2,
-                          Register heap_number_map = NoReg);
-  void AllocateHeapNumberWithValue(Register result,
-                                   DoubleRegister value,
-                                   Label* gc_required,
-                                   Register scratch1,
-                                   Register scratch2,
-                                   Register heap_number_map = NoReg);
+                          CPURegister value = NoFPReg,
+                          CPURegister heap_number_map = NoReg);
 
   // ---------------------------------------------------------------------------
   // Support functions.
 
   // Try to get function prototype of a function and puts the value in the
   // result register. Checks that the function really is a function and jumps
   // to the miss label if the fast checks fail. The function register will be
   // untouched; the other registers may be clobbered.
   enum BoundFunctionAction {
     kMissOnBoundFunction,
@@ skipping 927 matching lines @@
 #error "Unsupported option"
 #define CODE_COVERAGE_STRINGIFY(x) #x
 #define CODE_COVERAGE_TOSTRING(x) CODE_COVERAGE_STRINGIFY(x)
 #define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__)
 #define ACCESS_MASM(masm) masm->stop(__FILE_LINE__); masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 #endif  // V8_ARM64_MACRO_ASSEMBLER_ARM64_H_