fast_func.cpp

#include "fast_func.hpp"

#if !defined(__USE_OFFLOAD__)

#if defined(__AVX__) || !defined(_MSC_VER)

/**
* Copies the content of one 32 byte aligned
* byte buffer of length n into another using AVX 
*
* @param dest
*		A pointer to the destination buffer
*
* @param src
*		A pointer to the source buffer
*
* @param len
*		The number of bytes to copy
*/
OFFLOAD_DECL
void A_memcpy_n(void *dest, const unsigned char *src, int len) {

	I32B *A_memcpy_32_bufferS = (I32B*) (src);
	I32B *A_memcpy_32_bufferD = (I32B*) (dest);

	while (len >= 32) {
		STORE_I32B(A_memcpy_32_bufferD, A_memcpy_32_bufferS);
		A_memcpy_32_bufferS++;
		A_memcpy_32_bufferD++;

		_mm_prefetch((char*) (A_memcpy_32_bufferS), _MM_HINT_T2);
		len -= 32;
	}

	char *ptrS = (char*) A_memcpy_32_bufferS;
	char *ptrD = (char*) A_memcpy_32_bufferD;

	if (len >= 16) {
		STORE_I16B((I16B*) ptrD, (I16B*) ptrS);
		ptrS += 16;
		ptrD += 16;

		_mm_prefetch((char*) (ptrS), _MM_HINT_T2);
		len -= 16;
	}

	for (int i = 0; i < len; i++) {
		ptrD[i] = ptrS[i];
	}

};

#endif

#endif