Import rte_memcpy.h

rte_memcpy.h is a memcpy implementation from DPDK:

http://dpdk.org/

optimized for Sandy Bridge and Haswell. See

http://dpdk.org/ml/archives/dev/2014-November/008158.html

The original code is at

https://gist.github.com/lukego/efc82a15bde5ec83cb1b

1 files changed, 635 insertions, 0 deletions

diff --git a/sysdeps/x86_64/multiarch/rte_memcpy.h b/sysdeps/x86_64/multiarch/rte_memcpy.h
new file mode 100644
index 0000000000..7b2d3828a7
--- /dev/null
+++ b/sysdeps/x86_64/multiarch/rte_memcpy.h
@@ -0,0 +1,635 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ *   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 with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _RTE_MEMCPY_X86_64_H_
+#define _RTE_MEMCPY_X86_64_H_
+
+/**
+ * @file
+ *
+ * Functions for SSE/AVX/AVX2 implementation of memcpy().
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+#include <x86intrin.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * Copy bytes from one location to another. The locations must not overlap.
+ *
+ * @note This is implemented as a macro, so it's address should not be taken
+ * and care is needed as parameter expressions may be evaluated multiple times.
+ *
+ * @param dst
+ *   Pointer to the destination of the data.
+ * @param src
+ *   Pointer to the source data.
+ * @param n
+ *   Number of bytes to copy.
+ * @return
+ *   Pointer to the destination data.
+ */
+static inline void *
+rte_memcpy(void *dst, const void *src, size_t n) __attribute__((always_inline));
+
+#ifdef RTE_MACHINE_CPUFLAG_AVX2
+
+/**
+ * AVX2 implementation below
+ */
+
+/**
+ * Copy 16 bytes from one location to another,
+ * locations should not overlap.
+ */
+static inline void
+rte_mov16(uint8_t *dst, const uint8_t *src)
+{
+	__m128i xmm0;
+
+	xmm0 = _mm_loadu_si128((const __m128i *)src);
+	_mm_storeu_si128((__m128i *)dst, xmm0);
+}
+
+/**
+ * Copy 32 bytes from one location to another,
+ * locations should not overlap.
+ */
+static inline void
+rte_mov32(uint8_t *dst, const uint8_t *src)
+{
+	__m256i ymm0;
+
+	ymm0 = _mm256_loadu_si256((const __m256i *)src);
+	_mm256_storeu_si256((__m256i *)dst, ymm0);
+}
+
+/**
+ * Copy 64 bytes from one location to another,
+ * locations should not overlap.
+ */
+static inline void
+rte_mov64(uint8_t *dst, const uint8_t *src)
+{
+	rte_mov32((uint8_t *)dst + 0 * 32, (const uint8_t *)src + 0 * 32);
+	rte_mov32((uint8_t *)dst + 1 * 32, (const uint8_t *)src + 1 * 32);
+}
+
+/**
+ * Copy 128 bytes from one location to another,
+ * locations should not overlap.
+ */
+static inline void
+rte_mov128(uint8_t *dst, const uint8_t *src)
+{
+	rte_mov32((uint8_t *)dst + 0 * 32, (const uint8_t *)src + 0 * 32);
+	rte_mov32((uint8_t *)dst + 1 * 32, (const uint8_t *)src + 1 * 32);
+	rte_mov32((uint8_t *)dst + 2 * 32, (const uint8_t *)src + 2 * 32);
+	rte_mov32((uint8_t *)dst + 3 * 32, (const uint8_t *)src + 3 * 32);
+}
+
+/**
+ * Copy 256 bytes from one location to another,
+ * locations should not overlap.
+ */
+static inline void
+rte_mov256(uint8_t *dst, const uint8_t *src)
+{
+	rte_mov32((uint8_t *)dst + 0 * 32, (const uint8_t *)src + 0 * 32);
+	rte_mov32((uint8_t *)dst + 1 * 32, (const uint8_t *)src + 1 * 32);
+	rte_mov32((uint8_t *)dst + 2 * 32, (const uint8_t *)src + 2 * 32);
+	rte_mov32((uint8_t *)dst + 3 * 32, (const uint8_t *)src + 3 * 32);
+	rte_mov32((uint8_t *)dst + 4 * 32, (const uint8_t *)src + 4 * 32);
+	rte_mov32((uint8_t *)dst + 5 * 32, (const uint8_t *)src + 5 * 32);
+	rte_mov32((uint8_t *)dst + 6 * 32, (const uint8_t *)src + 6 * 32);
+	rte_mov32((uint8_t *)dst + 7 * 32, (const uint8_t *)src + 7 * 32);
+}
+
+/**
+ * Copy 64-byte blocks from one location to another,
+ * locations should not overlap.
+ */
+static inline void
+rte_mov64blocks(uint8_t *dst, const uint8_t *src, size_t n)
+{
+	__m256i ymm0, ymm1;
+
+	while (n >= 64) {
+		ymm0 = _mm256_loadu_si256((const __m256i *)((const uint8_t *)src + 0 * 32));
+		n -= 64;
+		ymm1 = _mm256_loadu_si256((const __m256i *)((const uint8_t *)src + 1 * 32));
+		src = (const uint8_t *)src + 64;
+		_mm256_storeu_si256((__m256i *)((uint8_t *)dst + 0 * 32), ymm0);
+		_mm256_storeu_si256((__m256i *)((uint8_t *)dst + 1 * 32), ymm1);
+		dst = (uint8_t *)dst + 64;
+	}
+}
+
+/**
+ * Copy 256-byte blocks from one location to another,
+ * locations should not overlap.
+ */
+static inline void
+rte_mov256blocks(uint8_t *dst, const uint8_t *src, size_t n)
+{
+	__m256i ymm0, ymm1, ymm2, ymm3, ymm4, ymm5, ymm6, ymm7;
+
+	while (n >= 256) {
+		ymm0 = _mm256_loadu_si256((const __m256i *)((const uint8_t *)src + 0 * 32));
+		n -= 256;
+		ymm1 = _mm256_loadu_si256((const __m256i *)((const uint8_t *)src + 1 * 32));
+		ymm2 = _mm256_loadu_si256((const __m256i *)((const uint8_t *)src + 2 * 32));
+		ymm3 = _mm256_loadu_si256((const __m256i *)((const uint8_t *)src + 3 * 32));
+		ymm4 = _mm256_loadu_si256((const __m256i *)((const uint8_t *)src + 4 * 32));
+		ymm5 = _mm256_loadu_si256((const __m256i *)((const uint8_t *)src + 5 * 32));
+		ymm6 = _mm256_loadu_si256((const __m256i *)((const uint8_t *)src + 6 * 32));
+		ymm7 = _mm256_loadu_si256((const __m256i *)((const uint8_t *)src + 7 * 32));
+		src = (const uint8_t *)src + 256;
+		_mm256_storeu_si256((__m256i *)((uint8_t *)dst + 0 * 32), ymm0);
+		_mm256_storeu_si256((__m256i *)((uint8_t *)dst + 1 * 32), ymm1);
+		_mm256_storeu_si256((__m256i *)((uint8_t *)dst + 2 * 32), ymm2);
+		_mm256_storeu_si256((__m256i *)((uint8_t *)dst + 3 * 32), ymm3);
+		_mm256_storeu_si256((__m256i *)((uint8_t *)dst + 4 * 32), ymm4);
+		_mm256_storeu_si256((__m256i *)((uint8_t *)dst + 5 * 32), ymm5);
+		_mm256_storeu_si256((__m256i *)((uint8_t *)dst + 6 * 32), ymm6);
+		_mm256_storeu_si256((__m256i *)((uint8_t *)dst + 7 * 32), ymm7);
+		dst = (uint8_t *)dst + 256;
+	}
+}
+
+static inline void *
+rte_memcpy(void *dst, const void *src, size_t n)
+{
+	void *ret = dst;
+	int dstofss;
+	int bits;
+
+	/**
+	 * Copy less than 16 bytes
+	 */
+	if (n < 16) {
+		if (n & 0x01) {
+			*(uint8_t *)dst = *(const uint8_t *)src;
+			src = (const uint8_t *)src + 1;
+			dst = (uint8_t *)dst + 1;
+		}
+		if (n & 0x02) {
+			*(uint16_t *)dst = *(const uint16_t *)src;
+			src = (const uint16_t *)src + 1;
+			dst = (uint16_t *)dst + 1;
+		}
+		if (n & 0x04) {
+			*(uint32_t *)dst = *(const uint32_t *)src;
+			src = (const uint32_t *)src + 1;
+			dst = (uint32_t *)dst + 1;
+		}
+		if (n & 0x08) {
+			*(uint64_t *)dst = *(const uint64_t *)src;
+		}
+		return ret;
+	}
+
+	/**
+	 * Fast way when copy size doesn't exceed 512 bytes
+	 */
+	if (n <= 32) {
+		rte_mov16((uint8_t *)dst, (const uint8_t *)src);
+		rte_mov16((uint8_t *)dst - 16 + n, (const uint8_t *)src - 16 + n);
+		return ret;
+	}
+	if (n <= 64) {
+		rte_mov32((uint8_t *)dst, (const uint8_t *)src);
+		rte_mov32((uint8_t *)dst - 32 + n, (const uint8_t *)src - 32 + n);
+		return ret;
+	}
+	if (n <= 512) {
+		if (n >= 256) {
+			n -= 256;
+			rte_mov256((uint8_t *)dst, (const uint8_t *)src);
+			src = (const uint8_t *)src + 256;
+			dst = (uint8_t *)dst + 256;
+		}
+		if (n >= 128) {
+			n -= 128;
+			rte_mov128((uint8_t *)dst, (const uint8_t *)src);
+			src = (const uint8_t *)src + 128;
+			dst = (uint8_t *)dst + 128;
+		}
+		if (n >= 64) {
+			n -= 64;
+			rte_mov64((uint8_t *)dst, (const uint8_t *)src);
+			src = (const uint8_t *)src + 64;
+			dst = (uint8_t *)dst + 64;
+		}
+COPY_BLOCK_64_BACK31:
+		if (n > 32) {
+			rte_mov32((uint8_t *)dst, (const uint8_t *)src);
+			rte_mov32((uint8_t *)dst - 32 + n, (const uint8_t *)src - 32 + n);
+			return ret;
+		}
+		if (n > 0) {
+			rte_mov32((uint8_t *)dst - 32 + n, (const uint8_t *)src - 32 + n);
+		}
+		return ret;
+	}
+
+	/**
+	 * Make store aligned when copy size exceeds 512 bytes
+	 */
+	dstofss = 32 - (int)((long long)(void *)dst & 0x1F);
+	n -= dstofss;
+	rte_mov32((uint8_t *)dst, (const uint8_t *)src);
+	src = (const uint8_t *)src + dstofss;
+	dst = (uint8_t *)dst + dstofss;
+
+	/**
+	 * Copy 256-byte blocks.
+	 * Use copy block function for better instruction order control,
+	 * which is important when load is unaligned.
+	 */
+	rte_mov256blocks((uint8_t *)dst, (const uint8_t *)src, n);
+	bits = n;
+	n = n & 255;
+	bits -= n;
+	src = (const uint8_t *)src + bits;
+	dst = (uint8_t *)dst + bits;
+
+	/**
+	 * Copy 64-byte blocks.
+	 * Use copy block function for better instruction order control,
+	 * which is important when load is unaligned.
+	 */
+	if (n >= 64) {
+		rte_mov64blocks((uint8_t *)dst, (const uint8_t *)src, n);
+		bits = n;
+		n = n & 63;
+		bits -= n;
+		src = (const uint8_t *)src + bits;
+		dst = (uint8_t *)dst + bits;
+	}
+
+	/**
+	 * Copy whatever left
+	 */
+	goto COPY_BLOCK_64_BACK31;
+}
+
+#else /* RTE_MACHINE_CPUFLAG_AVX2 */
+
+/**
+ * SSE & AVX implementation below
+ */
+
+/**
+ * Copy 16 bytes from one location to another,
+ * locations should not overlap.
+ */
+static inline void
+rte_mov16(uint8_t *dst, const uint8_t *src)
+{
+	__m128i xmm0;
+
+	xmm0 = _mm_loadu_si128((const __m128i *)(const __m128i *)src);
+	_mm_storeu_si128((__m128i *)dst, xmm0);
+}
+
+/**
+ * Copy 32 bytes from one location to another,
+ * locations should not overlap.
+ */
+static inline void
+rte_mov32(uint8_t *dst, const uint8_t *src)
+{
+	rte_mov16((uint8_t *)dst + 0 * 16, (const uint8_t *)src + 0 * 16);
+	rte_mov16((uint8_t *)dst + 1 * 16, (const uint8_t *)src + 1 * 16);
+}
+
+/**
+ * Copy 64 bytes from one location to another,
+ * locations should not overlap.
+ */
+static inline void
+rte_mov64(uint8_t *dst, const uint8_t *src)
+{
+	rte_mov16((uint8_t *)dst + 0 * 16, (const uint8_t *)src + 0 * 16);
+	rte_mov16((uint8_t *)dst + 1 * 16, (const uint8_t *)src + 1 * 16);
+	rte_mov16((uint8_t *)dst + 2 * 16, (const uint8_t *)src + 2 * 16);
+	rte_mov16((uint8_t *)dst + 3 * 16, (const uint8_t *)src + 3 * 16);
+}
+
+/**
+ * Copy 128 bytes from one location to another,
+ * locations should not overlap.
+ */
+static inline void
+rte_mov128(uint8_t *dst, const uint8_t *src)
+{
+	rte_mov16((uint8_t *)dst + 0 * 16, (const uint8_t *)src + 0 * 16);
+	rte_mov16((uint8_t *)dst + 1 * 16, (const uint8_t *)src + 1 * 16);
+	rte_mov16((uint8_t *)dst + 2 * 16, (const uint8_t *)src + 2 * 16);
+	rte_mov16((uint8_t *)dst + 3 * 16, (const uint8_t *)src + 3 * 16);
+	rte_mov16((uint8_t *)dst + 4 * 16, (const uint8_t *)src + 4 * 16);
+	rte_mov16((uint8_t *)dst + 5 * 16, (const uint8_t *)src + 5 * 16);
+	rte_mov16((uint8_t *)dst + 6 * 16, (const uint8_t *)src + 6 * 16);
+	rte_mov16((uint8_t *)dst + 7 * 16, (const uint8_t *)src + 7 * 16);
+}
+
+/**
+ * Copy 256 bytes from one location to another,
+ * locations should not overlap.
+ */
+static inline void
+rte_mov256(uint8_t *dst, const uint8_t *src)
+{
+	rte_mov16((uint8_t *)dst + 0 * 16, (const uint8_t *)src + 0 * 16);
+	rte_mov16((uint8_t *)dst + 1 * 16, (const uint8_t *)src + 1 * 16);
+	rte_mov16((uint8_t *)dst + 2 * 16, (const uint8_t *)src + 2 * 16);
+	rte_mov16((uint8_t *)dst + 3 * 16, (const uint8_t *)src + 3 * 16);
+	rte_mov16((uint8_t *)dst + 4 * 16, (const uint8_t *)src + 4 * 16);
+	rte_mov16((uint8_t *)dst + 5 * 16, (const uint8_t *)src + 5 * 16);
+	rte_mov16((uint8_t *)dst + 6 * 16, (const uint8_t *)src + 6 * 16);
+	rte_mov16((uint8_t *)dst + 7 * 16, (const uint8_t *)src + 7 * 16);
+	rte_mov16((uint8_t *)dst + 8 * 16, (const uint8_t *)src + 8 * 16);
+	rte_mov16((uint8_t *)dst + 9 * 16, (const uint8_t *)src + 9 * 16);
+	rte_mov16((uint8_t *)dst + 10 * 16, (const uint8_t *)src + 10 * 16);
+	rte_mov16((uint8_t *)dst + 11 * 16, (const uint8_t *)src + 11 * 16);
+	rte_mov16((uint8_t *)dst + 12 * 16, (const uint8_t *)src + 12 * 16);
+	rte_mov16((uint8_t *)dst + 13 * 16, (const uint8_t *)src + 13 * 16);
+	rte_mov16((uint8_t *)dst + 14 * 16, (const uint8_t *)src + 14 * 16);
+	rte_mov16((uint8_t *)dst + 15 * 16, (const uint8_t *)src + 15 * 16);
+}
+
+/**
+ * Macro for copying unaligned block from one location to another with constant load offset,
+ * 47 bytes leftover maximum,
+ * locations should not overlap.
+ * Requirements:
+ * - Store is aligned
+ * - Load offset is <offset>, which must be immediate value within [1, 15]
+ * - For <src>, make sure <offset> bit backwards & <16 - offset> bit forwards are available for loading
+ * - <dst>, <src>, <len> must be variables
+ * - __m128i <xmm0> ~ <xmm8> must be pre-defined
+ */
+#define MOVEUNALIGNED_LEFT47_IMM(dst, src, len, offset)                                                     \
+({                                                                                                          \
+    int tmp;                                                                                                \
+    while (len >= 128 + 16 - offset) {                                                                      \
+        xmm0 = _mm_loadu_si128((const __m128i *)((const uint8_t *)src - offset + 0 * 16));                  \
+        len -= 128;                                                                                         \
+        xmm1 = _mm_loadu_si128((const __m128i *)((const uint8_t *)src - offset + 1 * 16));                  \
+        xmm2 = _mm_loadu_si128((const __m128i *)((const uint8_t *)src - offset + 2 * 16));                  \
+        xmm3 = _mm_loadu_si128((const __m128i *)((const uint8_t *)src - offset + 3 * 16));                  \
+        xmm4 = _mm_loadu_si128((const __m128i *)((const uint8_t *)src - offset + 4 * 16));                  \
+        xmm5 = _mm_loadu_si128((const __m128i *)((const uint8_t *)src - offset + 5 * 16));                  \
+        xmm6 = _mm_loadu_si128((const __m128i *)((const uint8_t *)src - offset + 6 * 16));                  \
+        xmm7 = _mm_loadu_si128((const __m128i *)((const uint8_t *)src - offset + 7 * 16));                  \
+        xmm8 = _mm_loadu_si128((const __m128i *)((const uint8_t *)src - offset + 8 * 16));                  \
+        src = (const uint8_t *)src + 128;                                                                   \
+        _mm_storeu_si128((__m128i *)((uint8_t *)dst + 0 * 16), _mm_alignr_epi8(xmm1, xmm0, offset));        \
+        _mm_storeu_si128((__m128i *)((uint8_t *)dst + 1 * 16), _mm_alignr_epi8(xmm2, xmm1, offset));        \
+        _mm_storeu_si128((__m128i *)((uint8_t *)dst + 2 * 16), _mm_alignr_epi8(xmm3, xmm2, offset));        \
+        _mm_storeu_si128((__m128i *)((uint8_t *)dst + 3 * 16), _mm_alignr_epi8(xmm4, xmm3, offset));        \
+        _mm_storeu_si128((__m128i *)((uint8_t *)dst + 4 * 16), _mm_alignr_epi8(xmm5, xmm4, offset));        \
+        _mm_storeu_si128((__m128i *)((uint8_t *)dst + 5 * 16), _mm_alignr_epi8(xmm6, xmm5, offset));        \
+        _mm_storeu_si128((__m128i *)((uint8_t *)dst + 6 * 16), _mm_alignr_epi8(xmm7, xmm6, offset));        \
+        _mm_storeu_si128((__m128i *)((uint8_t *)dst + 7 * 16), _mm_alignr_epi8(xmm8, xmm7, offset));        \
+        dst = (uint8_t *)dst + 128;                                                                         \
+    }                                                                                                       \
+    tmp = len;                                                                                              \
+    len = ((len - 16 + offset) & 127) + 16 - offset;                                                        \
+    tmp -= len;                                                                                             \
+    src = (const uint8_t *)src + tmp;                                                                       \
+    dst = (uint8_t *)dst + tmp;                                                                             \
+    if (len >= 32 + 16 - offset) {                                                                          \
+        while (len >= 32 + 16 - offset) {                                                                   \
+            xmm0 = _mm_loadu_si128((const __m128i *)((const uint8_t *)src - offset + 0 * 16));              \
+            len -= 32;                                                                                      \
+            xmm1 = _mm_loadu_si128((const __m128i *)((const uint8_t *)src - offset + 1 * 16));              \
+            xmm2 = _mm_loadu_si128((const __m128i *)((const uint8_t *)src - offset + 2 * 16));              \
+            src = (const uint8_t *)src + 32;                                                                \
+            _mm_storeu_si128((__m128i *)((uint8_t *)dst + 0 * 16), _mm_alignr_epi8(xmm1, xmm0, offset));    \
+            _mm_storeu_si128((__m128i *)((uint8_t *)dst + 1 * 16), _mm_alignr_epi8(xmm2, xmm1, offset));    \
+            dst = (uint8_t *)dst + 32;                                                                      \
+        }                                                                                                   \
+        tmp = len;                                                                                          \
+        len = ((len - 16 + offset) & 31) + 16 - offset;                                                     \
+        tmp -= len;                                                                                         \
+        src = (const uint8_t *)src + tmp;                                                                   \
+        dst = (uint8_t *)dst + tmp;                                                                         \
+    }                                                                                                       \
+})
+
+/**
+ * Macro for copying unaligned block from one location to another,
+ * 47 bytes leftover maximum,
+ * locations should not overlap.
+ * Use switch here because the aligning instruction requires immediate value for shift count.
+ * Requirements:
+ * - Store is aligned
+ * - Load offset is <offset>, which must be within [1, 15]
+ * - For <src>, make sure <offset> bit backwards & <16 - offset> bit forwards are available for loading
+ * - <dst>, <src>, <len> must be variables
+ * - __m128i <xmm0> ~ <xmm8> used in MOVEUNALIGNED_LEFT47_IMM must be pre-defined
+ */
+#define MOVEUNALIGNED_LEFT47(dst, src, len, offset)                   \
+({                                                                    \
+    switch (offset) {                                                 \
+    case 0x01: MOVEUNALIGNED_LEFT47_IMM(dst, src, n, 0x01); break;    \
+    case 0x02: MOVEUNALIGNED_LEFT47_IMM(dst, src, n, 0x02); break;    \
+    case 0x03: MOVEUNALIGNED_LEFT47_IMM(dst, src, n, 0x03); break;    \
+    case 0x04: MOVEUNALIGNED_LEFT47_IMM(dst, src, n, 0x04); break;    \
+    case 0x05: MOVEUNALIGNED_LEFT47_IMM(dst, src, n, 0x05); break;    \
+    case 0x06: MOVEUNALIGNED_LEFT47_IMM(dst, src, n, 0x06); break;    \
+    case 0x07: MOVEUNALIGNED_LEFT47_IMM(dst, src, n, 0x07); break;    \
+    case 0x08: MOVEUNALIGNED_LEFT47_IMM(dst, src, n, 0x08); break;    \
+    case 0x09: MOVEUNALIGNED_LEFT47_IMM(dst, src, n, 0x09); break;    \
+    case 0x0A: MOVEUNALIGNED_LEFT47_IMM(dst, src, n, 0x0A); break;    \
+    case 0x0B: MOVEUNALIGNED_LEFT47_IMM(dst, src, n, 0x0B); break;    \
+    case 0x0C: MOVEUNALIGNED_LEFT47_IMM(dst, src, n, 0x0C); break;    \
+    case 0x0D: MOVEUNALIGNED_LEFT47_IMM(dst, src, n, 0x0D); break;    \
+    case 0x0E: MOVEUNALIGNED_LEFT47_IMM(dst, src, n, 0x0E); break;    \
+    case 0x0F: MOVEUNALIGNED_LEFT47_IMM(dst, src, n, 0x0F); break;    \
+    default:;                                                         \
+    }                                                                 \
+})
+
+static inline void *
+rte_memcpy(void *dst, const void *src, size_t n)
+{
+	__m128i xmm0, xmm1, xmm2, xmm3, xmm4, xmm5, xmm6, xmm7, xmm8;
+	void *ret = dst;
+	int dstofss;
+	int srcofs;
+
+	/**
+	 * Copy less than 16 bytes
+	 */
+	if (n < 16) {
+		if (n & 0x01) {
+			*(uint8_t *)dst = *(const uint8_t *)src;
+			src = (const uint8_t *)src + 1;
+			dst = (uint8_t *)dst + 1;
+		}
+		if (n & 0x02) {
+			*(uint16_t *)dst = *(const uint16_t *)src;
+			src = (const uint16_t *)src + 1;
+			dst = (uint16_t *)dst + 1;
+		}
+		if (n & 0x04) {
+			*(uint32_t *)dst = *(const uint32_t *)src;
+			src = (const uint32_t *)src + 1;
+			dst = (uint32_t *)dst + 1;
+		}
+		if (n & 0x08) {
+			*(uint64_t *)dst = *(const uint64_t *)src;
+		}
+		return ret;
+	}
+
+	/**
+	 * Fast way when copy size doesn't exceed 512 bytes
+	 */
+	if (n <= 32) {
+		rte_mov16((uint8_t *)dst, (const uint8_t *)src);
+		rte_mov16((uint8_t *)dst - 16 + n, (const uint8_t *)src - 16 + n);
+		return ret;
+	}
+	if (n <= 48) {
+		rte_mov32((uint8_t *)dst, (const uint8_t *)src);
+		rte_mov16((uint8_t *)dst - 16 + n, (const uint8_t *)src - 16 + n);
+		return ret;
+	}
+	if (n <= 64) {
+		rte_mov32((uint8_t *)dst, (const uint8_t *)src);
+		rte_mov16((uint8_t *)dst + 32, (const uint8_t *)src + 32);
+		rte_mov16((uint8_t *)dst - 16 + n, (const uint8_t *)src - 16 + n);
+		return ret;
+	}
+	if (n <= 128) {
+		goto COPY_BLOCK_128_BACK15;
+	}
+	if (n <= 512) {
+		if (n >= 256) {
+			n -= 256;
+			rte_mov128((uint8_t *)dst, (const uint8_t *)src);
+			rte_mov128((uint8_t *)dst + 128, (const uint8_t *)src + 128);
+			src = (const uint8_t *)src + 256;
+			dst = (uint8_t *)dst + 256;
+		}
+COPY_BLOCK_255_BACK15:
+		if (n >= 128) {
+			n -= 128;
+			rte_mov128((uint8_t *)dst, (const uint8_t *)src);
+			src = (const uint8_t *)src + 128;
+			dst = (uint8_t *)dst + 128;
+		}
+COPY_BLOCK_128_BACK15:
+		if (n >= 64) {
+			n -= 64;
+			rte_mov64((uint8_t *)dst, (const uint8_t *)src);
+			src = (const uint8_t *)src + 64;
+			dst = (uint8_t *)dst + 64;
+		}
+COPY_BLOCK_64_BACK15:
+		if (n >= 32) {
+			n -= 32;
+			rte_mov32((uint8_t *)dst, (const uint8_t *)src);
+			src = (const uint8_t *)src + 32;
+			dst = (uint8_t *)dst + 32;
+		}
+		if (n > 16) {
+			rte_mov16((uint8_t *)dst, (const uint8_t *)src);
+			rte_mov16((uint8_t *)dst - 16 + n, (const uint8_t *)src - 16 + n);
+			return ret;
+		}
+		if (n > 0) {
+			rte_mov16((uint8_t *)dst - 16 + n, (const uint8_t *)src - 16 + n);
+		}
+		return ret;
+	}
+
+	/**
+	 * Make store aligned when copy size exceeds 512 bytes,
+	 * and make sure the first 15 bytes are copied, because
+	 * unaligned copy functions require up to 15 bytes
+	 * backwards access.
+	 */
+	dstofss = 16 - (int)((long long)(void *)dst & 0x0F) + 16;
+	n -= dstofss;
+	rte_mov32((uint8_t *)dst, (const uint8_t *)src);
+	src = (const uint8_t *)src + dstofss;
+	dst = (uint8_t *)dst + dstofss;
+	srcofs = (int)((long long)(const void *)src & 0x0F);
+
+	/**
+	 * For aligned copy
+	 */
+	if (srcofs == 0) {
+		/**
+		 * Copy 256-byte blocks
+		 */
+		for (; n >= 256; n -= 256) {
+			rte_mov256((uint8_t *)dst, (const uint8_t *)src);
+			dst = (uint8_t *)dst + 256;
+			src = (const uint8_t *)src + 256;
+		}
+
+		/**
+		 * Copy whatever left
+		 */
+		goto COPY_BLOCK_255_BACK15;
+	}
+
+	/**
+	 * For copy with unaligned load
+	 */
+	MOVEUNALIGNED_LEFT47(dst, src, n, srcofs);
+
+	/**
+	 * Copy whatever left
+	 */
+	goto COPY_BLOCK_64_BACK15;
+}
+
+#endif /* RTE_MACHINE_CPUFLAG_AVX2 */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RTE_MEMCPY_X86_64_H_ */