[dpdk-dev] [PATCH v3 1/3] eal/x86: run-time dispatch over memcpy
Ananyev, Konstantin
konstantin.ananyev at intel.com
Mon Oct 2 01:41:54 CEST 2017
Hi Xiaoyun,
> This patch dynamically selects functions of memcpy at run-time based
> on CPU flags that current machine supports. This patch uses function
> pointers which are bind to the relative functions at constrctor time.
> In addition, AVX512 instructions set would be compiled only if users
> config it enabled and the compiler supports it.
>
> Signed-off-by: Xiaoyun Li <xiaoyun.li at intel.com>
> ---
> v2
> * Use gcc function multi-versioning to avoid compilation issues.
> * Add macros for AVX512 and AVX2. Only if users enable AVX512 and the
> compiler supports it, the AVX512 codes would be compiled. Only if the
> compiler supports AVX2, the AVX2 codes would be compiled.
>
> v3
> * Reduce function calls via only keep rte_memcpy_xxx.
> * Add conditions that when copy size is small, use inline code path.
> Otherwise, use dynamic code path.
> * To support attribute target, clang version must be greater than 3.7.
> Otherwise, would choose SSE/AVX code path, the same as before.
> * Move two mocro functions to the top of the code since they would be
> used in inline SSE/AVX and dynamic SSE/AVX codes.
>
> .../common/include/arch/x86/rte_memcpy.h | 1232 ++++++++++++++++++--
> 1 file changed, 1135 insertions(+), 97 deletions(-)
>
> diff --git a/lib/librte_eal/common/include/arch/x86/rte_memcpy.h b/lib/librte_eal/common/include/arch/x86/rte_memcpy.h
> index 74c280c..ed6c412 100644
> --- a/lib/librte_eal/common/include/arch/x86/rte_memcpy.h
> +++ b/lib/librte_eal/common/include/arch/x86/rte_memcpy.h
> @@ -45,6 +45,8 @@
> #include <string.h>
> #include <rte_vect.h>
> #include <rte_common.h>
> +#include <rte_cpuflags.h>
> +#include <rte_log.h>
>
> #ifdef __cplusplus
> extern "C" {
> @@ -68,6 +70,100 @@ extern "C" {
> static __rte_always_inline void *
> rte_memcpy(void *dst, const void *src, size_t n);
>
> +/**
> + * 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) \
> +__extension__ ({ \
> + 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) \
> +__extension__ ({ \
> + 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:; \
> + } \
> +})
> +
> #ifdef RTE_MACHINE_CPUFLAG_AVX512F
>
> #define ALIGNMENT_MASK 0x3F
> @@ -589,100 +685,6 @@ rte_mov256(uint8_t *dst, const uint8_t *src)
> 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) \
> -__extension__ ({ \
> - 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) \
> -__extension__ ({ \
> - 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_generic(void *dst, const void *src, size_t n)
> {
> @@ -888,13 +890,1049 @@ rte_memcpy_aligned(void *dst, const void *src, size_t n)
> return ret;
> }
>
> +/*
> + * Run-time dispatch impementation of memcpy.
> + */
> +
> +typedef void * (*rte_memcpy_t)(void *dst, const void *src, size_t n);
> +static rte_memcpy_t rte_memcpy_ptr;
> +
> +/**
> + * AVX512 implementation below
> + */
> +#ifdef CC_SUPPORT_AVX512
> +__attribute__((target("avx512f")))
> +static inline void *
> +rte_memcpy_AVX512F(void *dst, const void *src, size_t n)
> +{
> + if (!(((uintptr_t)dst | (uintptr_t)src) & 0x3F)) {
> + void *ret = dst;
> +
> + /* Copy size <= 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;
> + }
> +
> + /* Copy 16 <= size <= 32 bytes */
> + if (n <= 32) {
> + __m128i xmm0, xmm1;
> + xmm0 = _mm_loadu_si128((const __m128i *)src);
> + xmm1 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src - 16 + n));
> + _mm_storeu_si128((__m128i *)dst, xmm0);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst - 16 + n), xmm1);
> +
> + return ret;
> + }
> +
> + /* Copy 32 < size <= 64 bytes */
> + if (n <= 64) {
> + __m256i ymm0, ymm1;
> + ymm0 = _mm256_loadu_si256((const __m256i *)src);
> + ymm1 = _mm256_loadu_si256((const __m256i *)
> + ((const uint8_t *)src - 32 + n));
> + _mm256_storeu_si256((__m256i *)dst, ymm0);
> + _mm256_storeu_si256((__m256i *)
> + ((uint8_t *)dst - 32 + n), ymm1);
> +
> + return ret;
> + }
> +
> + /* Copy 64 bytes blocks */
> + for (; n >= 64; n -= 64) {
> + __m512i zmm0;
> + zmm0 = _mm512_loadu_si512((const void *)src);
> + _mm512_storeu_si512((void *)dst, zmm0);
> + dst = (uint8_t *)dst + 64;
> + src = (const uint8_t *)src + 64;
> + }
> +
> + /* Copy whatever left */
> + __m512i zmm0;
> + zmm0 = _mm512_loadu_si512((const void *)
> + ((const uint8_t *)src - 64 + n));
> + _mm512_storeu_si512((void *)((uint8_t *)dst - 64 + n), zmm0);
> +
> + return ret;
> + } else {
> + uintptr_t dstu = (uintptr_t)dst;
> + uintptr_t srcu = (uintptr_t)src;
> + void *ret = dst;
> + size_t dstofss;
> + size_t bits;
> +
> + /**
> + * Copy less than 16 bytes
> + */
> + if (n < 16) {
> + if (n & 0x01) {
> + *(uint8_t *)dstu = *(const uint8_t *)srcu;
> + srcu = (uintptr_t)((const uint8_t *)srcu + 1);
> + dstu = (uintptr_t)((uint8_t *)dstu + 1);
> + }
> + if (n & 0x02) {
> + *(uint16_t *)dstu = *(const uint16_t *)srcu;
> + srcu = (uintptr_t)((const uint16_t *)srcu + 1);
> + dstu = (uintptr_t)((uint16_t *)dstu + 1);
> + }
> + if (n & 0x04) {
> + *(uint32_t *)dstu = *(const uint32_t *)srcu;
> + srcu = (uintptr_t)((const uint32_t *)srcu + 1);
> + dstu = (uintptr_t)((uint32_t *)dstu + 1);
> + }
> + if (n & 0x08)
> + *(uint64_t *)dstu = *(const uint64_t *)srcu;
> + return ret;
> + }
> +
> + /**
> + * Fast way when copy size doesn't exceed 512 bytes
> + */
> + if (n <= 32) {
> + __m128i xmm0, xmm1;
> + xmm0 = _mm_loadu_si128((const __m128i *)src);
> + xmm1 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src - 16 + n));
> + _mm_storeu_si128((__m128i *)dst, xmm0);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst - 16 + n), xmm1);
> + return ret;
> + }
> + if (n <= 64) {
> + __m256i ymm0, ymm1;
> + ymm0 = _mm256_loadu_si256((const __m256i *)src);
> + ymm1 = _mm256_loadu_si256((const __m256i *)
> + ((const uint8_t *)src - 32 + n));
> + _mm256_storeu_si256((__m256i *)dst, ymm0);
> + _mm256_storeu_si256((__m256i *)
> + ((uint8_t *)dst - 32 + n), ymm1);
> + return ret;
> + }
> + if (n <= 512) {
> + if (n >= 256) {
> + n -= 256;
> + __m512i zmm0, zmm1, zmm2, zmm3;
> + zmm0 = _mm512_loadu_si512((const void *)src);
> + zmm1 = _mm512_loadu_si512((const void *)
> + ((const uint8_t *)src + 64));
> + zmm2 = _mm512_loadu_si512((const void *)
> + ((const uint8_t *)src + 2*64));
> + zmm3 = _mm512_loadu_si512((const void *)
> + ((const uint8_t *)src + 3*64));
> + _mm512_storeu_si512((void *)dst, zmm0);
> + _mm512_storeu_si512((void *)
> + ((uint8_t *)dst + 64), zmm1);
> + _mm512_storeu_si512((void *)
> + ((uint8_t *)dst + 2*64), zmm2);
> + _mm512_storeu_si512((void *)
> + ((uint8_t *)dst + 3*64), zmm3);
> + src = (const uint8_t *)src + 256;
> + dst = (uint8_t *)dst + 256;
> + }
> + if (n >= 128) {
> + n -= 128;
> + __m512i zmm0, zmm1;
> + zmm0 = _mm512_loadu_si512((const void *)src);
> + zmm1 = _mm512_loadu_si512((const void *)
> + ((const uint8_t *)src + 64));
> + _mm512_storeu_si512((void *)dst, zmm0);
> + _mm512_storeu_si512((void *)
> + ((uint8_t *)dst + 64), zmm1);
> + src = (const uint8_t *)src + 128;
> + dst = (uint8_t *)dst + 128;
> + }
> +COPY_BLOCK_128_BACK63:
> + if (n > 64) {
> + __m512i zmm0, zmm1;
> + zmm0 = _mm512_loadu_si512((const void *)src);
> + zmm1 = _mm512_loadu_si512((const void *)
> + ((const uint8_t *)src - 64 + n));
> + _mm512_storeu_si512((void *)dst, zmm0);
> + _mm512_storeu_si512((void *)
> + ((uint8_t *)dst - 64 + n), zmm1);
> + return ret;
> + }
> + if (n > 0) {
> + __m512i zmm0;
> + zmm0 = _mm512_loadu_si512((const void *)
> + ((const uint8_t *)src - 64 + n));
> + _mm512_storeu_si512((void *)
> + ((uint8_t *)dst - 64 + n), zmm0);
> + }
> + return ret;
> + }
> +
> + /**
> + * Make store aligned when copy size exceeds 512 bytes
> + */
> + dstofss = ((uintptr_t)dst & 0x3F);
> + if (dstofss > 0) {
> + dstofss = 64 - dstofss;
> + n -= dstofss;
> + __m512i zmm0;
> + zmm0 = _mm512_loadu_si512((const void *)src);
> + _mm512_storeu_si512((void *)dst, zmm0);
> + src = (const uint8_t *)src + dstofss;
> + dst = (uint8_t *)dst + dstofss;
> + }
> +
> + /**
> + * Copy 512-byte blocks.
> + * Use copy block function for better instruction order control,
> + * which is important when load is unaligned.
> + */
> + __m512i zmm0, zmm1, zmm2, zmm3, zmm4, zmm5, zmm6, zmm7;
> +
> + while (n >= 512) {
> + zmm0 = _mm512_loadu_si512((const void *)
> + ((const uint8_t *)src + 0 * 64));
> + n -= 512;
> + zmm1 = _mm512_loadu_si512((const void *)
> + ((const uint8_t *)src + 1 * 64));
> + zmm2 = _mm512_loadu_si512((const void *)
> + ((const uint8_t *)src + 2 * 64));
> + zmm3 = _mm512_loadu_si512((const void *)
> + ((const uint8_t *)src + 3 * 64));
> + zmm4 = _mm512_loadu_si512((const void *)
> + ((const uint8_t *)src + 4 * 64));
> + zmm5 = _mm512_loadu_si512((const void *)
> + ((const uint8_t *)src + 5 * 64));
> + zmm6 = _mm512_loadu_si512((const void *)
> + ((const uint8_t *)src + 6 * 64));
> + zmm7 = _mm512_loadu_si512((const void *)
> + ((const uint8_t *)src + 7 * 64));
> + src = (const uint8_t *)src + 512;
> + _mm512_storeu_si512((void *)
> + ((uint8_t *)dst + 0 * 64), zmm0);
> + _mm512_storeu_si512((void *)
> + ((uint8_t *)dst + 1 * 64), zmm1);
> + _mm512_storeu_si512((void *)
> + ((uint8_t *)dst + 2 * 64), zmm2);
> + _mm512_storeu_si512((void *)
> + ((uint8_t *)dst + 3 * 64), zmm3);
> + _mm512_storeu_si512((void *)
> + ((uint8_t *)dst + 4 * 64), zmm4);
> + _mm512_storeu_si512((void *)
> + ((uint8_t *)dst + 5 * 64), zmm5);
> + _mm512_storeu_si512((void *)
> + ((uint8_t *)dst + 6 * 64), zmm6);
> + _mm512_storeu_si512((void *)
> + ((uint8_t *)dst + 7 * 64), zmm7);
> + dst = (uint8_t *)dst + 512;
> + }
> + bits = n;
> + n = n & 511;
> + bits -= n;
> + src = (const uint8_t *)src + bits;
> + dst = (uint8_t *)dst + bits;
> +
> + /**
> + * Copy 128-byte blocks.
> + * Use copy block function for better instruction order control,
> + * which is important when load is unaligned.
> + */
> + if (n >= 128) {
> + __m512i zmm0, zmm1;
> +
> + while (n >= 128) {
> + zmm0 = _mm512_loadu_si512((const void *)
> + ((const uint8_t *)src + 0 * 64));
> + n -= 128;
> + zmm1 = _mm512_loadu_si512((const void *)
> + ((const uint8_t *)src + 1 * 64));
> + src = (const uint8_t *)src + 128;
> + _mm512_storeu_si512((void *)
> + ((uint8_t *)dst + 0 * 64), zmm0);
> + _mm512_storeu_si512((void *)
> + ((uint8_t *)dst + 1 * 64), zmm1);
> + dst = (uint8_t *)dst + 128;
> + }
> + bits = n;
> + n = n & 127;
> + bits -= n;
> + src = (const uint8_t *)src + bits;
> + dst = (uint8_t *)dst + bits;
> + }
> +
> + /**
> + * Copy whatever left
> + */
> + goto COPY_BLOCK_128_BACK63;
> + }
> +}
> +#endif
> +
> +/**
> + * AVX2 implementation below
> + */
> +#ifdef CC_SUPPORT_AVX2
> +__attribute__((target("avx2")))
> +static inline void *
> +rte_memcpy_AVX2(void *dst, const void *src, size_t n)
> +{
> + if (!(((uintptr_t)dst | (uintptr_t)src) & 0x1F)) {
> + void *ret = dst;
> +
> + /* Copy size <= 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;
> + }
> +
> + /* Copy 16 <= size <= 32 bytes */
> + if (n <= 32) {
> + __m128i xmm0, xmm1;
> + xmm0 = _mm_loadu_si128((const __m128i *)src);
> + xmm1 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src - 16 + n));
> + _mm_storeu_si128((__m128i *)dst, xmm0);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst - 16 + n), xmm1);
> +
> + return ret;
> + }
> +
> + /* Copy 32 < size <= 64 bytes */
> + if (n <= 64) {
> + __m256i ymm0, ymm1;
> + ymm0 = _mm256_loadu_si256((const __m256i *)src);
> + ymm1 = _mm256_loadu_si256((const __m256i *)
> + ((const uint8_t *)src - 32 + n));
> + _mm256_storeu_si256((__m256i *)dst, ymm0);
> + _mm256_storeu_si256((__m256i *)
> + ((uint8_t *)dst - 32 + n), ymm1);
> +
> + return ret;
> + }
> +
> + /* Copy 64 bytes blocks */
> + for (; n >= 64; n -= 64) {
> + __m256i ymm0, ymm1;
> + ymm0 = _mm256_loadu_si256((const __m256i *)src);
> + ymm1 = _mm256_loadu_si256((const __m256i *)
> + ((const uint8_t *)src + 32));
> + _mm256_storeu_si256((__m256i *)dst, ymm0);
> + _mm256_storeu_si256((__m256i *)
> + ((uint8_t *)dst + 32), ymm1);
> + dst = (uint8_t *)dst + 64;
> + src = (const uint8_t *)src + 64;
> + }
> +
> + /* Copy whatever left */
> + __m256i ymm0, ymm1;
> + ymm0 = _mm256_loadu_si256((const __m256i *)
> + ((const uint8_t *)src - 64 + n));
> + ymm1 = _mm256_loadu_si256((const __m256i *)
> + ((const uint8_t *)src - 32 + n));
> + _mm256_storeu_si256((__m256i *)((uint8_t *)dst - 64 + n), ymm0);
> + _mm256_storeu_si256((__m256i *)((uint8_t *)dst - 32 + n), ymm1);
> +
> + return ret;
> + } else {
> + uintptr_t dstu = (uintptr_t)dst;
> + uintptr_t srcu = (uintptr_t)src;
> + void *ret = dst;
> + size_t dstofss;
> + size_t bits;
> +
> + /**
> + * Copy less than 16 bytes
> + */
> + if (n < 16) {
> + if (n & 0x01) {
> + *(uint8_t *)dstu = *(const uint8_t *)srcu;
> + srcu = (uintptr_t)((const uint8_t *)srcu + 1);
> + dstu = (uintptr_t)((uint8_t *)dstu + 1);
> + }
> + if (n & 0x02) {
> + *(uint16_t *)dstu = *(const uint16_t *)srcu;
> + srcu = (uintptr_t)((const uint16_t *)srcu + 1);
> + dstu = (uintptr_t)((uint16_t *)dstu + 1);
> + }
> + if (n & 0x04) {
> + *(uint32_t *)dstu = *(const uint32_t *)srcu;
> + srcu = (uintptr_t)((const uint32_t *)srcu + 1);
> + dstu = (uintptr_t)((uint32_t *)dstu + 1);
> + }
> + if (n & 0x08)
> + *(uint64_t *)dstu = *(const uint64_t *)srcu;
> + return ret;
> + }
> +
> + /**
> + * Fast way when copy size doesn't exceed 256 bytes
> + */
> + if (n <= 32) {
> + __m128i xmm0, xmm1;
> + xmm0 = _mm_loadu_si128((const __m128i *)src);
> + xmm1 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src - 16 + n));
> + _mm_storeu_si128((__m128i *)dst, xmm0);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst - 16 + n), xmm1);
> + return ret;
> + }
> + if (n <= 48) {
> + __m128i xmm0, xmm1, xmm2;
> + xmm0 = _mm_loadu_si128((const __m128i *)src);
> + xmm1 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 16));
> + xmm2 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src - 16 + n));
> + _mm_storeu_si128((__m128i *)dst, xmm0);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 16), xmm1);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst - 16 + n), xmm2);
> + return ret;
> + }
> + if (n <= 64) {
> + __m256i ymm0, ymm1;
> + ymm0 = _mm256_loadu_si256((const __m256i *)src);
> + ymm1 = _mm256_loadu_si256((const __m256i *)
> + ((const uint8_t *)src - 32 + n));
> + _mm256_storeu_si256((__m256i *)dst, ymm0);
> + _mm256_storeu_si256((__m256i *)
> + ((uint8_t *)dst - 32 + n), ymm1);
> + return ret;
> + }
> + if (n <= 256) {
> + if (n >= 128) {
> + n -= 128;
> + __m256i ymm0, ymm1, ymm2, ymm3;
> + ymm0 = _mm256_loadu_si256((const __m256i *)src);
> + ymm1 = _mm256_loadu_si256((const __m256i *)
> + ((const uint8_t *)src + 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));
> + _mm256_storeu_si256((__m256i *)dst, ymm0);
> + _mm256_storeu_si256((__m256i *)
> + ((uint8_t *)dst + 32), ymm1);
> + _mm256_storeu_si256((__m256i *)
> + ((uint8_t *)dst + 2*32), ymm2);
> + _mm256_storeu_si256((__m256i *)
> + ((uint8_t *)dst + 3*32), ymm3);
> + src = (const uint8_t *)src + 128;
> + dst = (uint8_t *)dst + 128;
> + }
> +COPY_BLOCK_128_BACK31:
> + if (n >= 64) {
> + n -= 64;
> + __m256i ymm0, ymm1;
> + ymm0 = _mm256_loadu_si256((const __m256i *)src);
> + ymm1 = _mm256_loadu_si256((const __m256i *)
> + ((const uint8_t *)src + 32));
> + _mm256_storeu_si256((__m256i *)dst, ymm0);
> + _mm256_storeu_si256((__m256i *)
> + ((uint8_t *)dst + 32), ymm1);
> + src = (const uint8_t *)src + 64;
> + dst = (uint8_t *)dst + 64;
> + }
> + if (n > 32) {
> + __m256i ymm0, ymm1;
> + ymm0 = _mm256_loadu_si256((const __m256i *)src);
> + ymm1 = _mm256_loadu_si256((const __m256i *)
> + ((const uint8_t *)src - 32 + n));
> + _mm256_storeu_si256((__m256i *)dst, ymm0);
> + _mm256_storeu_si256((__m256i *)
> + ((uint8_t *)dst - 32 + n), ymm1);
> + return ret;
> + }
> + if (n > 0) {
> + __m256i ymm0;
> + ymm0 = _mm256_loadu_si256((const __m256i *)
> + ((const uint8_t *)src - 32 + n));
> + _mm256_storeu_si256((__m256i *)
> + ((uint8_t *)dst - 32 + n), ymm0);
> + }
> + return ret;
> + }
> +
> + /**
> + * Make store aligned when copy size exceeds 256 bytes
> + */
> + dstofss = (uintptr_t)dst & 0x1F;
> + if (dstofss > 0) {
> + dstofss = 32 - dstofss;
> + n -= dstofss;
> + __m256i ymm0;
> + ymm0 = _mm256_loadu_si256((const __m256i *)src);
> + _mm256_storeu_si256((__m256i *)dst, ymm0);
> + src = (const uint8_t *)src + dstofss;
> + dst = (uint8_t *)dst + dstofss;
> + }
> +
> + /**
> + * Copy 128-byte blocks
> + */
> + __m256i ymm0, ymm1, ymm2, ymm3;
> +
> + while (n >= 128) {
> + ymm0 = _mm256_loadu_si256((const __m256i *)
> + ((const uint8_t *)src + 0 * 32));
> + n -= 128;
> + 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));
> + src = (const uint8_t *)src + 128;
> + _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);
> + dst = (uint8_t *)dst + 128;
> + }
> + bits = n;
> + n = n & 127;
> + bits -= n;
> + src = (const uint8_t *)src + bits;
> + dst = (uint8_t *)dst + bits;
> +
> + /**
> + * Copy whatever left
> + */
> + goto COPY_BLOCK_128_BACK31;
> + }
> +}
> +#endif
> +
> +/**
> + * SSE & AVX implementation below
> + */
> +static inline void *
> +rte_memcpy_DEFAULT(void *dst, const void *src, size_t n)
> +{
> + if (!(((uintptr_t)dst | (uintptr_t)src) & 0x0F)) {
> + void *ret = dst;
> +
> + /* Copy size <= 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;
> + }
> +
> + /* Copy 16 <= size <= 32 bytes */
> + if (n <= 32) {
> + __m128i xmm0, xmm1;
> + xmm0 = _mm_loadu_si128((const __m128i *)src);
> + xmm1 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src - 16 + n));
> + _mm_storeu_si128((__m128i *)dst, xmm0);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst - 16 + n), xmm1);
> +
> + return ret;
> + }
> +
> + /* Copy 32 < size <= 64 bytes */
> + if (n <= 64) {
> + __m128i xmm0, xmm1, xmm2, xmm3;
> + xmm0 = _mm_loadu_si128((const __m128i *)src);
> + xmm1 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 16));
> + xmm2 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src - 32 + n));
> + xmm3 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src - 16 + n));
> + _mm_storeu_si128((__m128i *)dst, xmm0);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 16), xmm1);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst - 32 + n), xmm2);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst - 16 + n), xmm3);
> +
> + return ret;
> + }
> +
> + /* Copy 64 bytes blocks */
> + for (; n >= 64; n -= 64) {
> + __m128i xmm0, xmm1, xmm2, xmm3;
> + xmm0 = _mm_loadu_si128((const __m128i *)src);
> + xmm1 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 16));
> + xmm2 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 2*16));
> + xmm3 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 3*16));
> + _mm_storeu_si128((__m128i *)dst, xmm0);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 16), xmm1);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 2*16), xmm2);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 3*16), xmm3);
> + dst = (uint8_t *)dst + 64;
> + src = (const uint8_t *)src + 64;
> + }
> +
> + /* Copy whatever left */
> + __m128i xmm0, xmm1, xmm2, xmm3;
> + xmm0 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src - 64 + n));
> + xmm1 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src - 48 + n));
> + xmm2 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src - 32 + n));
> + xmm3 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src - 16 + n));
> + _mm_storeu_si128((__m128i *)((uint8_t *)dst - 64 + n), xmm0);
> + _mm_storeu_si128((__m128i *)((uint8_t *)dst - 48 + n), xmm1);
> + _mm_storeu_si128((__m128i *)((uint8_t *)dst - 32 + n), xmm2);
> + _mm_storeu_si128((__m128i *)((uint8_t *)dst - 16 + n), xmm3);
> +
> + return ret;
> + } else {
> + __m128i xmm0, xmm1, xmm2, xmm3, xmm4, xmm5, xmm6, xmm7, xmm8;
> + uintptr_t dstu = (uintptr_t)dst;
> + uintptr_t srcu = (uintptr_t)src;
> + void *ret = dst;
> + size_t dstofss;
> + size_t srcofs;
> +
> + /**
> + * Copy less than 16 bytes
> + */
> + if (n < 16) {
> + if (n & 0x01) {
> + *(uint8_t *)dstu = *(const uint8_t *)srcu;
> + srcu = (uintptr_t)((const uint8_t *)srcu + 1);
> + dstu = (uintptr_t)((uint8_t *)dstu + 1);
> + }
> + if (n & 0x02) {
> + *(uint16_t *)dstu = *(const uint16_t *)srcu;
> + srcu = (uintptr_t)((const uint16_t *)srcu + 1);
> + dstu = (uintptr_t)((uint16_t *)dstu + 1);
> + }
> + if (n & 0x04) {
> + *(uint32_t *)dstu = *(const uint32_t *)srcu;
> + srcu = (uintptr_t)((const uint32_t *)srcu + 1);
> + dstu = (uintptr_t)((uint32_t *)dstu + 1);
> + }
> + if (n & 0x08)
> + *(uint64_t *)dstu = *(const uint64_t *)srcu;
> + return ret;
> + }
> +
> + /**
> + * Fast way when copy size doesn't exceed 512 bytes
> + */
> + if (n <= 32) {
> + __m128i xmm0, xmm1;
> + xmm0 = _mm_loadu_si128((const __m128i *)src);
> + xmm1 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src - 16 + n));
> + _mm_storeu_si128((__m128i *)dst, xmm0);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst - 16 + n), xmm1);
> + return ret;
> + }
> + if (n <= 48) {
> + __m128i xmm0, xmm1, xmm2;
> + xmm0 = _mm_loadu_si128((const __m128i *)src);
> + xmm1 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 16));
> + xmm2 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src - 16 + n));
> + _mm_storeu_si128((__m128i *)dst, xmm0);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 16), xmm1);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst - 16 + n), xmm2);
> + return ret;
> + }
> + if (n <= 64) {
> + __m128i xmm0, xmm1, xmm2, xmm3;
> + xmm0 = _mm_loadu_si128((const __m128i *)src);
> + xmm1 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 16));
> + xmm2 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 32));
> + xmm3 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src - 16 + n));
> + _mm_storeu_si128((__m128i *)dst, xmm0);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 16), xmm1);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 32), xmm2);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst - 16 + n), xmm3);
> + return ret;
> + }
> + if (n <= 128)
> + goto COPY_BLOCK_128_BACK15;
> + if (n <= 512) {
> + if (n >= 256) {
> + n -= 256;
> + __m128i xmm0, xmm1;
> + xmm0 = _mm_loadu_si128((const __m128i *)src);
> + xmm1 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 16));
> + _mm_storeu_si128((__m128i *)dst, xmm0);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 16), xmm1);
> + xmm0 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 2*16));
> + xmm1 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 3*16));
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 2*16), xmm0);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 3*16), xmm1);
> + xmm0 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 4*16));
> + xmm1 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 5*16));
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 4*16), xmm0);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 5*16), xmm1);
> + xmm0 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 6*16));
> + xmm1 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 7*16));
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 6*16), xmm0);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 7*16), xmm1);
> +
> + xmm0 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 128));
> + xmm1 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 128 + 16));
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 128), xmm0);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 128 + 16), xmm1);
> + xmm0 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 128 + 2*16));
> + xmm1 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 128 + 3*16));
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 128 + 2*16), xmm0);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 128 + 3*16), xmm1);
> + xmm0 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 128 + 4*16));
> + xmm1 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 128 + 5*16));
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 128 + 4*16), xmm0);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 128 + 5*16), xmm1);
> + xmm0 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 128 + 6*16));
> + xmm1 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 128 + 7*16));
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 128 + 6*16), xmm0);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 128 + 7*16), xmm1);
> + src = (const uint8_t *)src + 256;
> + dst = (uint8_t *)dst + 256;
> + }
> +COPY_BLOCK_255_BACK15:
> + if (n >= 128) {
> + n -= 128;
> + __m128i xmm0, xmm1;
> + xmm0 = _mm_loadu_si128((const __m128i *)src);
> + xmm1 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 16));
> + _mm_storeu_si128((__m128i *)dst, xmm0);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 16), xmm1);
> + xmm0 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 2*16));
> + xmm1 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 3*16));
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 2*16), xmm0);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 3*16), xmm1);
> + xmm0 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 4*16));
> + xmm1 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 5*16));
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 4*16), xmm0);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 5*16), xmm1);
> + xmm0 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 6*16));
> + xmm1 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 7*16));
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 6*16), xmm0);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 7*16), xmm1);
> + src = (const uint8_t *)src + 128;
> + dst = (uint8_t *)dst + 128;
> + }
> +COPY_BLOCK_128_BACK15:
> + if (n >= 64) {
> + n -= 64;
> + __m128i xmm0, xmm1;
> + xmm0 = _mm_loadu_si128((const __m128i *)src);
> + xmm1 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 16));
> + _mm_storeu_si128((__m128i *)dst, xmm0);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 16), xmm1);
> +
> + xmm0 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 2*16));
> + xmm1 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 3*16));
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 2*16), xmm0);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 3*16), xmm1);
> + src = (const uint8_t *)src + 64;
> + dst = (uint8_t *)dst + 64;
> + }
> +COPY_BLOCK_64_BACK15:
> + if (n >= 32) {
> + n -= 32;
> + __m128i xmm0, xmm1;
> + xmm0 = _mm_loadu_si128((const __m128i *)src);
> + xmm1 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 16));
> + _mm_storeu_si128((__m128i *)dst, xmm0);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 16), xmm1);
> + src = (const uint8_t *)src + 32;
> + dst = (uint8_t *)dst + 32;
> + }
> + if (n > 16) {
> + __m128i xmm0, xmm1;
> + xmm0 = _mm_loadu_si128((const __m128i *)src);
> + xmm1 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src - 16 + n));
> + _mm_storeu_si128((__m128i *)dst, xmm0);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst - 16 + n), xmm1);
> + return ret;
> + }
> + if (n > 0) {
> + __m128i xmm0;
> + xmm0 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src - 16 + n));
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst - 16 + n), xmm0);
> + }
> + 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 = (uintptr_t)dst & 0x0F;
> + if (dstofss > 0) {
> + dstofss = 16 - dstofss + 16;
> + n -= dstofss;
> + __m128i xmm0, xmm1;
> + xmm0 = _mm_loadu_si128((const __m128i *)src);
> + xmm1 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 16));
> + _mm_storeu_si128((__m128i *)dst, xmm0);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 16), xmm1);
> + src = (const uint8_t *)src + dstofss;
> + dst = (uint8_t *)dst + dstofss;
> + }
> + srcofs = ((uintptr_t)src & 0x0F);
> +
> + /**
> + * For aligned copy
> + */
> + if (srcofs == 0) {
> + /**
> + * Copy 256-byte blocks
> + */
> + for (; n >= 256; n -= 256) {
> + __m128i xmm0, xmm1;
> + xmm0 = _mm_loadu_si128((const __m128i *)src);
> + xmm1 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 16));
> + _mm_storeu_si128((__m128i *)dst, xmm0);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 16), xmm1);
> + xmm0 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 2*16));
> + xmm1 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 3*16));
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 2*16), xmm0);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 3*16), xmm1);
> + xmm0 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 4*16));
> + xmm1 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 5*16));
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 4*16), xmm0);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 5*16), xmm1);
> + xmm0 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 6*16));
> + xmm1 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 7*16));
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 6*16), xmm0);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 7*16), xmm1);
> +
> + xmm0 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 8*16));
> + xmm1 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 9*16));
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 8*16), xmm0);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 9*16), xmm1);
> + xmm0 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 10*16));
> + xmm1 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 11*16));
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 10*16), xmm0);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 11*16), xmm1);
> + xmm0 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 12*16));
> + xmm1 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 13*16));
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 12*16), xmm0);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 13*16), xmm1);
> + xmm0 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 14*16));
> + xmm1 = _mm_loadu_si128((const __m128i *)
> + ((const uint8_t *)src + 15*16));
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 14*16), xmm0);
> + _mm_storeu_si128((__m128i *)
> + ((uint8_t *)dst + 15*16), xmm1);
> + 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;
> + }
> +}
> +
> +static void __attribute__((constructor))
That means that each file with '#include <re_memcpy.h> will have its own copy
of that function:
$ objdump -d x86_64-native-linuxapp-gcc/app/testpmd | grep '<rte_memcpy_init>:' | sort -u | wc -l
233
Same story for rte_memcpy_ptr and rte_memcpy_DEFAULT, etc...
Obviously we need (and want) only one copy of that stuff per binary.
> +rte_memcpy_init(void)
> +{
> +#ifdef CC_SUPPORT_AVX512
> + if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_AVX512F)) {
> + rte_memcpy_ptr = rte_memcpy_AVX512F;
> + RTE_LOG(DEBUG, EAL, "AVX512 is using!\n");
> + } else
> +#endif
> +#ifdef CC_SUPPORT_AVX2
Why do you assume this macro will be defined?
By whom?
There is no such macro with gcc:
$ gcc -march=native -dM -E - </dev/null 2>&1 | grep AVX2
#define __AVX2__ 1
, and you don't define it yourself.
When building with '-march=native' on BDW only rte_memcpy_DEFAULT get compiled.
To summarize: as I understand the goal of that patch was
(assuming that our current rte_memcpy() implementation is good in terms of both performance and functionality):
1. Based on current rte_memcpy() implementation define 3 x86 arch specific rte_memcpy flavors:
a) rte_memcpy_SSE
b) rte_memcpy_AVX2
c) rte_memcpy_AVX512
2. Select appropriate flavor based on current HW at runtime,
i.e. both 3 flavors should be present in the binary and selection should be made
at program startup.
As I can see none of the goals was achieved with the current patch,
instead a lot of redundant code was introduced.
So I think it is NACK for the current version.
What I think need to be done instead:
1. mv lib/librte_eal/common/include/arch/x86/rte_memcpy.h lib/librte_eal/common/include/arch/x86/rte_memcpy_internal.h
2. inside rte_memcpy_internal.h rename rte_memcpy() into rte_memcpy_internal().
3. create 3 files:
rte_memcpy_sse.c
rte_memcpy_avx2.c
rte_memcpy_avx512.c
Inside each of these files we define corresponding rte_memcpy_xxx() function.
I.E:
rte_memcpy_avx2.c:
....
#ifndef RTE_MACHINE_CPUFLAG_AVX2
#error "no avx2 support"
endif
#include "rte_memcpy_internal.h"
...
void *
rte_memcpy_avx2(void *dst, const void *src, size_t n)
{
return rte_memcpy_internal(dst, src, n);
}
4. Make changes inside lib/librte_eal/Makefile to ensure that each of rte_memcpy_xxx()
get build with appropriate -march flags (I.E: avx2 with -mavx2, etc.)
You can use librte_acl/Makefile as a reference.
5. Create rte_memcpy.c and put rte_memcpy_ptr/rte_memcpy_init() definitions in that file.
6. Create new rte_memcpy.h and define rte_memcpy() in it:
...
#include <rte_memcpy_internal.h>
...
+#define RTE_X86_MEMCPY_THRESH 128
static inline void *
rte_memcpy(void *dst, const void *src, size_t n)
{
if (n <= RTE_X86_MEMCPY_THRESH)
return rte_memcpy_internal(dst, src, n);
else
return (*rte_memcpy_ptr)(dst, src, n);
}
7. Test it properly - i.e. build dpdk with default target and make sure each of 3 flavors
could be selected properly at runtime based on underlying arch.
8. As a possible future improvement - with such changes we don't need a generic inline
implementation. We can think about creating a faster version that need to copy
<= 128B.
Konstantin
> + if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_AVX2)) {
> + rte_memcpy_ptr = rte_memcpy_AVX2;
> + RTE_LOG(DEBUG, EAL, "AVX2 is using!\n");
> + } else
> +#endif
> + {
> + rte_memcpy_ptr = rte_memcpy_DEFAULT;
> + RTE_LOG(DEBUG, EAL, "Default SSE/AVX is using!\n");
> + }
> +}
> +
> +#define MEMCPY_THRESH 128
> static inline void *
> rte_memcpy(void *dst, const void *src, size_t n)
> {
> - if (!(((uintptr_t)dst | (uintptr_t)src) & ALIGNMENT_MASK))
> - return rte_memcpy_aligned(dst, src, n);
> + if (n <= MEMCPY_THRESH) {
> + if (!(((uintptr_t)dst | (uintptr_t)src) & ALIGNMENT_MASK))
> + return rte_memcpy_aligned(dst, src, n);
> + else
> + return rte_memcpy_generic(dst, src, n);
> + }
> else
> - return rte_memcpy_generic(dst, src, n);
> + return (*rte_memcpy_ptr)(dst, src, n);
> }
>
> #ifdef __cplusplus
> --
> 2.7.4
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