#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 <emmintrin.h>
+#include <x86intrin.h>
#ifdef __cplusplus
extern "C" {
#endif
-#include "generic/rte_memcpy.h"
+/**
+ * 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 __INTEL_COMPILER
-#pragma warning(disable:593) /* Stop unused variable warning (reg_a etc). */
-#endif
+#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 reg_a;
- asm volatile (
- "movdqu (%[src]), %[reg_a]\n\t"
- "movdqu %[reg_a], (%[dst])\n\t"
- : [reg_a] "=x" (reg_a)
- : [src] "r" (src),
- [dst] "r"(dst)
- : "memory"
- );
+ __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)
{
- __m128i reg_a, reg_b;
- asm volatile (
- "movdqu (%[src]), %[reg_a]\n\t"
- "movdqu 16(%[src]), %[reg_b]\n\t"
- "movdqu %[reg_a], (%[dst])\n\t"
- "movdqu %[reg_b], 16(%[dst])\n\t"
- : [reg_a] "=x" (reg_a),
- [reg_b] "=x" (reg_b)
- : [src] "r" (src),
- [dst] "r"(dst)
- : "memory"
- );
-}
+ __m256i ymm0;
-static inline void
-rte_mov48(uint8_t *dst, const uint8_t *src)
-{
- __m128i reg_a, reg_b, reg_c;
- asm volatile (
- "movdqu (%[src]), %[reg_a]\n\t"
- "movdqu 16(%[src]), %[reg_b]\n\t"
- "movdqu 32(%[src]), %[reg_c]\n\t"
- "movdqu %[reg_a], (%[dst])\n\t"
- "movdqu %[reg_b], 16(%[dst])\n\t"
- "movdqu %[reg_c], 32(%[dst])\n\t"
- : [reg_a] "=x" (reg_a),
- [reg_b] "=x" (reg_b),
- [reg_c] "=x" (reg_c)
- : [src] "r" (src),
- [dst] "r"(dst)
- : "memory"
- );
+ 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)
{
- __m128i reg_a, reg_b, reg_c, reg_d;
- asm volatile (
- "movdqu (%[src]), %[reg_a]\n\t"
- "movdqu 16(%[src]), %[reg_b]\n\t"
- "movdqu 32(%[src]), %[reg_c]\n\t"
- "movdqu 48(%[src]), %[reg_d]\n\t"
- "movdqu %[reg_a], (%[dst])\n\t"
- "movdqu %[reg_b], 16(%[dst])\n\t"
- "movdqu %[reg_c], 32(%[dst])\n\t"
- "movdqu %[reg_d], 48(%[dst])\n\t"
- : [reg_a] "=x" (reg_a),
- [reg_b] "=x" (reg_b),
- [reg_c] "=x" (reg_c),
- [reg_d] "=x" (reg_d)
- : [src] "r" (src),
- [dst] "r"(dst)
- : "memory"
- );
+ 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)
{
- __m128i reg_a, reg_b, reg_c, reg_d, reg_e, reg_f, reg_g, reg_h;
- asm volatile (
- "movdqu (%[src]), %[reg_a]\n\t"
- "movdqu 16(%[src]), %[reg_b]\n\t"
- "movdqu 32(%[src]), %[reg_c]\n\t"
- "movdqu 48(%[src]), %[reg_d]\n\t"
- "movdqu 64(%[src]), %[reg_e]\n\t"
- "movdqu 80(%[src]), %[reg_f]\n\t"
- "movdqu 96(%[src]), %[reg_g]\n\t"
- "movdqu 112(%[src]), %[reg_h]\n\t"
- "movdqu %[reg_a], (%[dst])\n\t"
- "movdqu %[reg_b], 16(%[dst])\n\t"
- "movdqu %[reg_c], 32(%[dst])\n\t"
- "movdqu %[reg_d], 48(%[dst])\n\t"
- "movdqu %[reg_e], 64(%[dst])\n\t"
- "movdqu %[reg_f], 80(%[dst])\n\t"
- "movdqu %[reg_g], 96(%[dst])\n\t"
- "movdqu %[reg_h], 112(%[dst])\n\t"
- : [reg_a] "=x" (reg_a),
- [reg_b] "=x" (reg_b),
- [reg_c] "=x" (reg_c),
- [reg_d] "=x" (reg_d),
- [reg_e] "=x" (reg_e),
- [reg_f] "=x" (reg_f),
- [reg_g] "=x" (reg_g),
- [reg_h] "=x" (reg_h)
- : [src] "r" (src),
- [dst] "r"(dst)
- : "memory"
- );
+ 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);
}
-#ifdef __INTEL_COMPILER
-#pragma warning(enable:593)
-#endif
-
+/**
+ * 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_mov128(dst, src);
- rte_mov128(dst + 128, src + 128);
+ 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);
}
-#define rte_memcpy(dst, src, n) \
- ({ (__builtin_constant_p(n)) ? \
- memcpy((dst), (src), (n)) : \
- rte_memcpy_func((dst), (src), (n)); })
+/**
+ * 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_func(void *dst, const void *src, size_t n)
+rte_memcpy(void *dst, const void *src, size_t n)
{
void *ret = dst;
+ int dstofss;
+ int bits;
- /* We can't copy < 16 bytes using XMM registers so do it manually. */
+ /**
+ * Copy less than 16 bytes
+ */
if (n < 16) {
if (n & 0x01) {
*(uint8_t *)dst = *(const uint8_t *)src;
- dst = (uint8_t *)dst + 1;
src = (const uint8_t *)src + 1;
+ dst = (uint8_t *)dst + 1;
}
if (n & 0x02) {
*(uint16_t *)dst = *(const uint16_t *)src;
- dst = (uint16_t *)dst + 1;
src = (const uint16_t *)src + 1;
+ dst = (uint16_t *)dst + 1;
}
if (n & 0x04) {
*(uint32_t *)dst = *(const uint32_t *)src;
- dst = (uint32_t *)dst + 1;
src = (const uint32_t *)src + 1;
+ dst = (uint32_t *)dst + 1;
}
if (n & 0x08) {
*(uint64_t *)dst = *(const uint64_t *)src;
return ret;
}
- /* Special fast cases for <= 128 bytes */
+ /**
+ * 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 <= 128) {
- rte_mov64((uint8_t *)dst, (const uint8_t *)src);
- rte_mov64((uint8_t *)dst - 64 + n, (const uint8_t *)src - 64 + n);
+ 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;
}
- /*
- * For large copies > 128 bytes. This combination of 256, 64 and 16 byte
- * copies was found to be faster than doing 128 and 32 byte copies as
- * well.
+ /**
+ * Make store aligned when copy size exceeds 512 bytes
*/
- 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;
+ 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;
}
- /*
- * We split the remaining bytes (which will be less than 256) into
- * 64byte (2^6) chunks.
- * Using incrementing integers in the case labels of a switch statement
- * enourages the compiler to use a jump table. To get incrementing
- * integers, we shift the 2 relevant bits to the LSB position to first
- * get decrementing integers, and then subtract.
+ /**
+ * Copy whatever left
*/
- switch (3 - (n >> 6)) {
- case 0x00:
- rte_mov64((uint8_t *)dst, (const uint8_t *)src);
- n -= 64;
- dst = (uint8_t *)dst + 64;
- src = (const uint8_t *)src + 64; /* fallthrough */
- case 0x01:
- rte_mov64((uint8_t *)dst, (const uint8_t *)src);
- n -= 64;
- dst = (uint8_t *)dst + 64;
- src = (const uint8_t *)src + 64; /* fallthrough */
- case 0x02:
- rte_mov64((uint8_t *)dst, (const uint8_t *)src);
- n -= 64;
- dst = (uint8_t *)dst + 64;
- src = (const uint8_t *)src + 64; /* fallthrough */
- default:
- ;
+ 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;
}
- /*
- * We split the remaining bytes (which will be less than 64) into
- * 16byte (2^4) chunks, using the same switch structure as above.
+ /**
+ * Fast way when copy size doesn't exceed 512 bytes
*/
- switch (3 - (n >> 4)) {
- case 0x00:
- rte_mov16((uint8_t *)dst, (const uint8_t *)src);
- n -= 16;
- dst = (uint8_t *)dst + 16;
- src = (const uint8_t *)src + 16; /* fallthrough */
- case 0x01:
- rte_mov16((uint8_t *)dst, (const uint8_t *)src);
- n -= 16;
- dst = (uint8_t *)dst + 16;
- src = (const uint8_t *)src + 16; /* fallthrough */
- case 0x02:
+ if (n <= 32) {
rte_mov16((uint8_t *)dst, (const uint8_t *)src);
- n -= 16;
- dst = (uint8_t *)dst + 16;
- src = (const uint8_t *)src + 16; /* fallthrough */
- default:
- ;
+ rte_mov16((uint8_t *)dst - 16 + n, (const uint8_t *)src - 16 + n);
+ return ret;
}
-
- /* Copy any remaining bytes, without going beyond end of buffers */
- if (n != 0) {
+ 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;
}
- return ret;
+ 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
git.droids-corp.org / dpdk.git / blobdiff