Implement byte swapping instructions on MIPS32 and MIPS64.

src/mips64/macro-assembler-mips64.h

 // Copyright 2012 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_MIPS_MACRO_ASSEMBLER_MIPS_H_
 #define V8_MIPS_MACRO_ASSEMBLER_MIPS_H_
 
 #include "src/assembler.h"
 #include "src/globals.h"
 #include "src/mips64/assembler-mips64.h"
@@ skipping 704 matching lines @@
            Register scratch = at);
   void Dlsa(Register rd, Register rs, Register rt, uint8_t sa,
             Register scratch = at);
 
   void Pref(int32_t hint, const MemOperand& rs);
 
 
   // ---------------------------------------------------------------------------
   // Pseudo-instructions.
 
+  // Change endianness
+  void ByteSwapSigned(Register reg, int operand_size);
+  void ByteSwapUnsigned(Register reg, int operand_size);
+
   void mov(Register rd, Register rt) { or_(rd, rt, zero_reg); }
 
   void Ulh(Register rd, const MemOperand& rs);
   void Ulhu(Register rd, const MemOperand& rs);
   void Ush(Register rd, const MemOperand& rs, Register scratch);
 
   void Ulw(Register rd, const MemOperand& rs);
   void Ulwu(Register rd, const MemOperand& rs);
   void Usw(Register rd, const MemOperand& rs);
 
@@ skipping 1296 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 internal
 }  // namespace v8
 
 #endif  // V8_MIPS_MACRO_ASSEMBLER_MIPS_H_