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/*
* 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>
typedef u8 u8x16u __attribute__ ((vector_size (16), aligned (1)));
typedef u8 u8x32u __attribute__ ((vector_size (32), aligned (1)));
static inline void
clib_mov16 (u8 * dst, const u8 * src)
{
*(u8x16u *) dst = *(u8x16u *) src;
}
static inline void
clib_mov32 (u8 * dst, const u8 * src)
{
*(u8x32u *) dst = *(u8x32u *) src;
}
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:
*/
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