Add optimized version of memcpy on ia32.

src/ia32/assembler-ia32.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 772 matching lines @@
   // Use either movsd or movlpd.
   void movdbl(XMMRegister dst, const Operand& src);
   void movdbl(const Operand& dst, XMMRegister src);
 
   void movd(XMMRegister dst, const Operand& src);
   void movsd(XMMRegister dst, XMMRegister src);
 
   void pxor(XMMRegister dst, XMMRegister src);
   void ptest(XMMRegister dst, XMMRegister src);
 
+  // Parallel XMM operations.
+  void movntdqa(XMMRegister src, const Operand& dst);
+  void movntdq(const Operand& dst, XMMRegister src);
+  // Prefetch src position into cache level.
+  // Level 1, 2 or 3 specifies CPU cache level. Level 0 specifies a
+  // non-temporal
+  void prefetch(const Operand& src, int level);
+  // TODO(lrn): Need SFENCE for movnt?
+
   // Debugging
   void Print();
 
   // Check the code size generated from label to here.
   int SizeOfCodeGeneratedSince(Label* l) { return pc_offset() - l->pos(); }
 
   // Mark address of the ExitJSFrame code.
   void RecordJSReturn();
 
   // Record a comment relocation entry that can be used by a disassembler.
@@ skipping 129 matching lines @@
  private:
   Assembler* assembler_;
 #ifdef DEBUG
   int space_before_;
 #endif
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_IA32_ASSEMBLER_IA32_H_