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Diffstat (limited to 'src/vppinfra/memcpy_avx.h')
| -rw-r--r-- | src/vppinfra/memcpy_avx.h | 296 |
1 files changed, 296 insertions, 0 deletions
diff --git a/src/vppinfra/memcpy_avx.h b/src/vppinfra/memcpy_avx.h new file mode 100644 index 00000000..e987d044 --- /dev/null +++ b/src/vppinfra/memcpy_avx.h @@ -0,0 +1,296 @@ +/* + * Copyright (c) 2016 Cisco and/or its affiliates. + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +/*- + * 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 included_clib_memcpy_avx_h +#define included_clib_memcpy_avx_h + +#include <stdint.h> +#include <x86intrin.h> + +static inline void +clib_mov16 (u8 * dst, const u8 * src) +{ + __m128i xmm0; + + xmm0 = _mm_loadu_si128 ((const __m128i *) src); + _mm_storeu_si128 ((__m128i *) dst, xmm0); +} + +static inline void +clib_mov32 (u8 * dst, const u8 * src) +{ + __m256i ymm0; + + ymm0 = _mm256_loadu_si256 ((const __m256i *) src); + _mm256_storeu_si256 ((__m256i *) dst, ymm0); +} + +static inline void +clib_mov64 (u8 * dst, const u8 * src) +{ + clib_mov32 ((u8 *) dst + 0 * 32, (const u8 *) src + 0 * 32); + clib_mov32 ((u8 *) dst + 1 * 32, (const u8 *) src + 1 * 32); +} + +static inline void +clib_mov128 (u8 * dst, const u8 * src) +{ + clib_mov64 ((u8 *) dst + 0 * 64, (const u8 *) src + 0 * 64); + clib_mov64 ((u8 *) dst + 1 * 64, (const u8 *) src + 1 * 64); +} + +static inline void +clib_mov256 (u8 * dst, const u8 * src) +{ + clib_mov128 ((u8 *) dst + 0 * 128, (const u8 *) src + 0 * 128); + clib_mov128 ((u8 *) dst + 1 * 128, (const u8 *) src + 1 * 128); +} + +static inline void +clib_mov64blocks (u8 * dst, const u8 * src, size_t n) +{ + __m256i ymm0, ymm1; + + while (n >= 64) + { + ymm0 = + _mm256_loadu_si256 ((const __m256i *) ((const u8 *) src + 0 * 32)); + n -= 64; + ymm1 = + _mm256_loadu_si256 ((const __m256i *) ((const u8 *) src + 1 * 32)); + src = (const u8 *) src + 64; + _mm256_storeu_si256 ((__m256i *) ((u8 *) dst + 0 * 32), ymm0); + _mm256_storeu_si256 ((__m256i *) ((u8 *) dst + 1 * 32), ymm1); + dst = (u8 *) dst + 64; + } +} + +static inline void +clib_mov256blocks (u8 * dst, const u8 * src, size_t n) +{ + __m256i ymm0, ymm1, ymm2, ymm3, ymm4, ymm5, ymm6, ymm7; + + while (n >= 256) + { + ymm0 = + _mm256_loadu_si256 ((const __m256i *) ((const u8 *) src + 0 * 32)); + n -= 256; + ymm1 = + _mm256_loadu_si256 ((const __m256i *) ((const u8 *) src + 1 * 32)); + ymm2 = + _mm256_loadu_si256 ((const __m256i *) ((const u8 *) src + 2 * 32)); + ymm3 = + _mm256_loadu_si256 ((const __m256i *) ((const u8 *) src + 3 * 32)); + ymm4 = + _mm256_loadu_si256 ((const __m256i *) ((const u8 *) src + 4 * 32)); + ymm5 = + _mm256_loadu_si256 ((const __m256i *) ((const u8 *) src + 5 * 32)); + ymm6 = + _mm256_loadu_si256 ((const __m256i *) ((const u8 *) src + 6 * 32)); + ymm7 = + _mm256_loadu_si256 ((const __m256i *) ((const u8 *) src + 7 * 32)); + src = (const u8 *) src + 256; + _mm256_storeu_si256 ((__m256i *) ((u8 *) dst + 0 * 32), ymm0); + _mm256_storeu_si256 ((__m256i *) ((u8 *) dst + 1 * 32), ymm1); + _mm256_storeu_si256 ((__m256i *) ((u8 *) dst + 2 * 32), ymm2); + _mm256_storeu_si256 ((__m256i *) ((u8 *) dst + 3 * 32), ymm3); + _mm256_storeu_si256 ((__m256i *) ((u8 *) dst + 4 * 32), ymm4); + _mm256_storeu_si256 ((__m256i *) ((u8 *) dst + 5 * 32), ymm5); + _mm256_storeu_si256 ((__m256i *) ((u8 *) dst + 6 * 32), ymm6); + _mm256_storeu_si256 ((__m256i *) ((u8 *) dst + 7 * 32), ymm7); + dst = (u8 *) dst + 256; + } +} + +static inline void * +clib_memcpy (void *dst, const void *src, size_t n) +{ + uword dstu = (uword) dst; + uword srcu = (uword) src; + void *ret = dst; + size_t dstofss; + size_t bits; + + /** + * Copy less than 16 bytes + */ + if (n < 16) + { + if (n & 0x01) + { + *(u8 *) dstu = *(const u8 *) srcu; + srcu = (uword) ((const u8 *) srcu + 1); + dstu = (uword) ((u8 *) dstu + 1); + } + if (n & 0x02) + { + *(uint16_t *) dstu = *(const uint16_t *) srcu; + srcu = (uword) ((const uint16_t *) srcu + 1); + dstu = (uword) ((uint16_t *) dstu + 1); + } + if (n & 0x04) + { + *(uint32_t *) dstu = *(const uint32_t *) srcu; + srcu = (uword) ((const uint32_t *) srcu + 1); + dstu = (uword) ((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) + { + clib_mov16 ((u8 *) dst, (const u8 *) src); + clib_mov16 ((u8 *) dst - 16 + n, (const u8 *) src - 16 + n); + return ret; + } + if (n <= 64) + { + clib_mov32 ((u8 *) dst, (const u8 *) src); + clib_mov32 ((u8 *) dst - 32 + n, (const u8 *) src - 32 + n); + return ret; + } + if (n <= 512) + { + if (n >= 256) + { + n -= 256; + clib_mov256 ((u8 *) dst, (const u8 *) src); + src = (const u8 *) src + 256; + dst = (u8 *) dst + 256; + } + if (n >= 128) + { + n -= 128; + clib_mov128 ((u8 *) dst, (const u8 *) src); + src = (const u8 *) src + 128; + dst = (u8 *) dst + 128; + } + if (n >= 64) + { + n -= 64; + clib_mov64 ((u8 *) dst, (const u8 *) src); + src = (const u8 *) src + 64; + dst = (u8 *) dst + 64; + } + COPY_BLOCK_64_BACK31: + if (n > 32) + { + clib_mov32 ((u8 *) dst, (const u8 *) src); + clib_mov32 ((u8 *) dst - 32 + n, (const u8 *) src - 32 + n); + return ret; + } + if (n > 0) + { + clib_mov32 ((u8 *) dst - 32 + n, (const u8 *) src - 32 + n); + } + return ret; + } + + /** + * Make store aligned when copy size exceeds 512 bytes + */ + dstofss = (uword) dst & 0x1F; + if (dstofss > 0) + { + dstofss = 32 - dstofss; + n -= dstofss; + clib_mov32 ((u8 *) dst, (const u8 *) src); + src = (const u8 *) src + dstofss; + dst = (u8 *) dst + dstofss; + } + + /** + * Copy 256-byte blocks. + * Use copy block function for better instruction order control, + * which is important when load is unaligned. + */ + clib_mov256blocks ((u8 *) dst, (const u8 *) src, n); + bits = n; + n = n & 255; + bits -= n; + src = (const u8 *) src + bits; + dst = (u8 *) 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) + { + clib_mov64blocks ((u8 *) dst, (const u8 *) src, n); + bits = n; + n = n & 63; + bits -= n; + src = (const u8 *) src + bits; + dst = (u8 *) dst + bits; + } + + /** + * Copy whatever left + */ + goto COPY_BLOCK_64_BACK31; +} + + +#endif /* included_clib_mamcpy_avx_h */ + + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |