A64: Implement Peek/PokePair

src/a64/macro-assembler-a64.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 521 matching lines @@
   // If the current stack pointer (according to StackPointer()) is csp, then
   // csp must be aligned to 16 bytes.
   void Poke(const CPURegister& src, const Operand& offset);
 
   // Peek at a value on the stack, and put it in 'dst'. The offset is in bytes.
   //
   // If the current stack pointer (according to StackPointer()) is csp, then
   // csp must be aligned to 16 bytes.
   void Peek(const CPURegister& dst, const Operand& offset);
 
+  // Poke 'src1' and 'src2' onto the stack. The values written will be adjacent
+  // with 'src2' at a higher address than 'src1'. The offset is in bytes.
+  //
+  // If the current stack pointer (according to StackPointer()) is csp, then
+  // csp must be aligned to 16 bytes.
+  void PokePair(const CPURegister& src1, const CPURegister& src2, int offset);
+
+  // Peek at two values on the stack, and put them in 'dst1' and 'dst2'. The
+  // values peeked will be adjacent, with the value in 'dst2' being from a
+  // higher address than 'dst1'. The offset is in bytes.
+  //
+  // If the current stack pointer (according to StackPointer()) is csp, then
+  // csp must be aligned to 16 bytes.
+  void PeekPair(const CPURegister& dst1, const CPURegister& dst2, int offset);
+
   // Claim or drop stack space without actually accessing memory.
   //
   // In debug mode, both of these will write invalid data into the claimed or
   // dropped space.
   //
   // If the current stack pointer (according to StackPointer()) is csp, then it
   // must be aligned to 16 bytes and the size claimed or dropped must be a
   // multiple of 16 bytes.
   //
   // Note that unit_size must be specified in bytes. For variants which take a
@@ skipping 1563 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_A64_MACRO_ASSEMBLER_A64_H_