ARM64: Generate optimized code for Math.floor and Math.round with double outputs.

src/arm64/constants-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 112 matching lines @@
 const unsigned kWordSizeLog2 = 5;
 const unsigned kWordSizeInBytes = kWordSize >> 3;
 const unsigned kWordSizeInBytesLog2 = kWordSizeLog2 - 3;
 const unsigned kDoubleWordSize = 64;
 const unsigned kDoubleWordSizeInBytes = kDoubleWordSize >> 3;
 const unsigned kQuadWordSize = 128;
 const unsigned kQuadWordSizeInBytes = kQuadWordSize >> 3;
 // AArch64 floating-point specifics. These match IEEE-754.
 const unsigned kDoubleMantissaBits = 52;
 const unsigned kDoubleExponentBits = 11;
+const unsigned kDoubleExponentBias = 1023;
 const unsigned kFloatMantissaBits = 23;
 const unsigned kFloatExponentBits = 8;
 
 #define REGISTER_CODE_LIST(R)                                                  \
 R(0)  R(1)  R(2)  R(3)  R(4)  R(5)  R(6)  R(7)                                 \
 R(8)  R(9)  R(10) R(11) R(12) R(13) R(14) R(15)                                \
 R(16) R(17) R(18) R(19) R(20) R(21) R(22) R(23)                                \
 R(24) R(25) R(26) R(27) R(28) R(29) R(30) R(31)
 
 #define INSTRUCTION_FIELDS_LIST(V_)                                            \
@@ skipping 1119 matching lines @@
 };
 
 enum UnallocatedOp {
   UnallocatedFixed = 0x00000000,
   UnallocatedFMask = 0x00000000
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM64_CONSTANTS_ARM64_H_