ARM64: Use default-NaN mode to canonicalize NaNs.

src/arm64/macro-assembler-arm64.h

 // 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.
 
 #ifndef V8_ARM64_MACRO_ASSEMBLER_ARM64_H_
 #define V8_ARM64_MACRO_ASSEMBLER_ARM64_H_
 
 #include <vector>
 
 #include "v8globals.h"
@@ skipping 770 matching lines @@
   // pointer is not accessed.
   //
   // 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();
 
+  void AssertFPCRState(Register fpcr = NoReg);
+  void ConfigureFPCR();
+  void CanonicalizeNaN(const FPRegister& dst, const FPRegister& src);
+  void CanonicalizeNaN(const FPRegister& reg) {
+    CanonicalizeNaN(reg, reg);
+  }
+
   // Load an object from the root table.
   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);
 
@@ skipping 725 matching lines @@
   void CheckFastObjectElements(Register map, Register scratch, Label* fail);
 
   // Check to see if number can be stored as a double in FastDoubleElements.
   // If it can, store it at the index specified by key_reg in the array,
   // otherwise jump to fail.
   void StoreNumberToDoubleElements(Register value_reg,
                                    Register key_reg,
                                    Register elements_reg,
                                    Register scratch1,
                                    FPRegister fpscratch1,
-                                   FPRegister fpscratch2,
                                    Label* fail,
                                    int elements_offset = 0);
 
   // Picks out an array index from the hash field.
   // Register use:
   //   hash - holds the index's hash. Clobbered.
   //   index - holds the overwritten index on exit.
   void IndexFromHash(Register hash, Register index);
 
   // ---------------------------------------------------------------------------
@@ skipping 737 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_