performance - convert memcpy() code from x86 to x64 platform -

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this code memcpy() on x86 platforms . need memcpy() on x64 platform . 

_asm {          mov esi, src          mov edi, dest          mov ecx, nbytes          shr ecx, 6 // 64 bytes per iteration   loop1:      movq mm1,  0[esi] // read in source data      movq mm2,  8[esi]      movq mm3, 16[esi]      movq mm4, 24[esi]      movq mm5, 32[esi]      movq mm6, 40[esi]      movq mm7, 48[esi]      movq mm0, 56[esi]       movq  0[edi], mm1 // write destination      movq  8[edi], mm2      movq 16[edi], mm3      movq 24[edi], mm4      movq 32[edi], mm5      movq 40[edi], mm6      movq 48[edi], mm7      movq 56[edi], mm0       add esi, 64      add edi, 64      dec ecx      jnz loop1       emms  }

i have no knowledge of x64 assembly language . how convert code x86 x64 ?

i suppose replacing esi , edi rsi , rdi should trick. although not become faster (or fast). other pointers, x64 backwards compatible x86.

in general better make c loop or use default memcpy. generate better code.


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