ARM: Enable VFP default NaN mode

src/arm/macro-assembler-arm.h

 // 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 442 matching lines @@
             Register dst2,
             const MemOperand& src,
             Condition cond = al);
 
   // Store two consecutive registers to two consecutive memory locations.
   void Strd(Register src1,
             Register src2,
             const MemOperand& dst,
             Condition cond = al);
 
+  // Ensure that FPSCR contains values needed by JavaScript.
+  // We need the NaNModeControlBit to be sure that operations like
+  // vadd and vsub generate the Canonical NaN (if a NaN must be generated).
+  // In VFP3 it will be always the Canonical NaN.
+  // In VFP2 it will be either the Canonical NaN or the negative version
+  // of the Canonical NaN. It doesn't matter if we have two values. The aim
+  // is to be sure to never generate the hole NaN.
+  void VFPEnsureFPSCRState(Register scratch);
+
+  // If the value is a NaN, canonicalize the value else, do nothing.
+  void VFPCanonicalizeNaN(const DwVfpRegister value,
+                          const Condition cond = al);
+
   // Compare double values and move the result to the normal condition flags.
   void VFPCompareAndSetFlags(const DwVfpRegister src1,
                              const DwVfpRegister src2,
                              const Condition cond = al);
   void VFPCompareAndSetFlags(const DwVfpRegister src1,
                              const double src2,
                              const Condition cond = al);
 
   // Compare double values and then load the fpscr flags to a register.
   void VFPCompareAndLoadFlags(const DwVfpRegister src1,
@@ skipping 962 matching lines @@
 #define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__)
 #define ACCESS_MASM(masm) masm->stop(__FILE_LINE__); masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_MACRO_ASSEMBLER_ARM_H_