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331f66a5b4efcc800e0bbaf23d6f158d54fb00d1
vpp/src/vppinfra/memcpy_sse3.h
Damjan Marion 331f66a5b4 vppinfra: revert clib_memcpy optimization 
Looks like some compiler versions are producing wrong code when we are
copying 9-16 bytes so reverting back to the original code.

Change-Id: I74b5fa54a3b01f6288648f1cb0926030edd3b26f
Signed-off-by: Damjan Marion <damarion@cisco.com>
2017-07-12 21:20:11 +02:00

357 lines
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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_sse3_h
#define included_clib_memcpy_sse3_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)
{
clib_mov16 ((u8 *) dst + 0 * 16, (const u8 *) src + 0 * 16);
clib_mov16 ((u8 *) dst + 1 * 16, (const u8 *) src + 1 * 16);
}
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);
}
/**
* 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 CLIB_MVUNALIGN_LEFT47_IMM(dst, src, len, offset) \
({ \
int tmp; \
while (len >= 128 + 16 - offset) { \
xmm0 = _mm_loadu_si128((const __m128i *)((const u8 *)src - offset + 0 * 16)); \
len -= 128; \
xmm1 = _mm_loadu_si128((const __m128i *)((const u8 *)src - offset + 1 * 16)); \
xmm2 = _mm_loadu_si128((const __m128i *)((const u8 *)src - offset + 2 * 16)); \
xmm3 = _mm_loadu_si128((const __m128i *)((const u8 *)src - offset + 3 * 16)); \
xmm4 = _mm_loadu_si128((const __m128i *)((const u8 *)src - offset + 4 * 16)); \
xmm5 = _mm_loadu_si128((const __m128i *)((const u8 *)src - offset + 5 * 16)); \
xmm6 = _mm_loadu_si128((const __m128i *)((const u8 *)src - offset + 6 * 16)); \
xmm7 = _mm_loadu_si128((const __m128i *)((const u8 *)src - offset + 7 * 16)); \
xmm8 = _mm_loadu_si128((const __m128i *)((const u8 *)src - offset + 8 * 16)); \
src = (const u8 *)src + 128; \
_mm_storeu_si128((__m128i *)((u8 *)dst + 0 * 16), _mm_alignr_epi8(xmm1, xmm0, offset)); \
_mm_storeu_si128((__m128i *)((u8 *)dst + 1 * 16), _mm_alignr_epi8(xmm2, xmm1, offset)); \
_mm_storeu_si128((__m128i *)((u8 *)dst + 2 * 16), _mm_alignr_epi8(xmm3, xmm2, offset)); \
_mm_storeu_si128((__m128i *)((u8 *)dst + 3 * 16), _mm_alignr_epi8(xmm4, xmm3, offset)); \
_mm_storeu_si128((__m128i *)((u8 *)dst + 4 * 16), _mm_alignr_epi8(xmm5, xmm4, offset)); \
_mm_storeu_si128((__m128i *)((u8 *)dst + 5 * 16), _mm_alignr_epi8(xmm6, xmm5, offset)); \
_mm_storeu_si128((__m128i *)((u8 *)dst + 6 * 16), _mm_alignr_epi8(xmm7, xmm6, offset)); \
_mm_storeu_si128((__m128i *)((u8 *)dst + 7 * 16), _mm_alignr_epi8(xmm8, xmm7, offset)); \
dst = (u8 *)dst + 128; \
} \
tmp = len; \
len = ((len - 16 + offset) & 127) + 16 - offset; \
tmp -= len; \
src = (const u8 *)src + tmp; \
dst = (u8 *)dst + tmp; \
if (len >= 32 + 16 - offset) { \
while (len >= 32 + 16 - offset) { \
xmm0 = _mm_loadu_si128((const __m128i *)((const u8 *)src - offset + 0 * 16)); \
len -= 32; \
xmm1 = _mm_loadu_si128((const __m128i *)((const u8 *)src - offset + 1 * 16)); \
xmm2 = _mm_loadu_si128((const __m128i *)((const u8 *)src - offset + 2 * 16)); \
src = (const u8 *)src + 32; \
_mm_storeu_si128((__m128i *)((u8 *)dst + 0 * 16), _mm_alignr_epi8(xmm1, xmm0, offset)); \
_mm_storeu_si128((__m128i *)((u8 *)dst + 1 * 16), _mm_alignr_epi8(xmm2, xmm1, offset)); \
dst = (u8 *)dst + 32; \
} \
tmp = len; \
len = ((len - 16 + offset) & 31) + 16 - offset; \
tmp -= len; \
src = (const u8 *)src + tmp; \
dst = (u8 *)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 CLIB_MVUNALIGN_LEFT47_IMM must be pre-defined
*/
#define CLIB_MVUNALIGN_LEFT47(dst, src, len, offset) \
({ \
switch (offset) { \
case 0x01: CLIB_MVUNALIGN_LEFT47_IMM(dst, src, n, 0x01); break; \
case 0x02: CLIB_MVUNALIGN_LEFT47_IMM(dst, src, n, 0x02); break; \
case 0x03: CLIB_MVUNALIGN_LEFT47_IMM(dst, src, n, 0x03); break; \
case 0x04: CLIB_MVUNALIGN_LEFT47_IMM(dst, src, n, 0x04); break; \
case 0x05: CLIB_MVUNALIGN_LEFT47_IMM(dst, src, n, 0x05); break; \
case 0x06: CLIB_MVUNALIGN_LEFT47_IMM(dst, src, n, 0x06); break; \
case 0x07: CLIB_MVUNALIGN_LEFT47_IMM(dst, src, n, 0x07); break; \
case 0x08: CLIB_MVUNALIGN_LEFT47_IMM(dst, src, n, 0x08); break; \
case 0x09: CLIB_MVUNALIGN_LEFT47_IMM(dst, src, n, 0x09); break; \
case 0x0A: CLIB_MVUNALIGN_LEFT47_IMM(dst, src, n, 0x0A); break; \
case 0x0B: CLIB_MVUNALIGN_LEFT47_IMM(dst, src, n, 0x0B); break; \
case 0x0C: CLIB_MVUNALIGN_LEFT47_IMM(dst, src, n, 0x0C); break; \
case 0x0D: CLIB_MVUNALIGN_LEFT47_IMM(dst, src, n, 0x0D); break; \
case 0x0E: CLIB_MVUNALIGN_LEFT47_IMM(dst, src, n, 0x0E); break; \
case 0x0F: CLIB_MVUNALIGN_LEFT47_IMM(dst, src, n, 0x0F); break; \
default:; \
} \
})
static inline void *
clib_memcpy (void *dst, const void *src, size_t n)
{
__m128i xmm0, xmm1, xmm2, xmm3, xmm4, xmm5, xmm6, xmm7, xmm8;
uword dstu = (uword) dst;
uword srcu = (uword) src;
void *ret = dst;
size_t dstofss;
size_t srcofs;
/**
* 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)
{
*(u16 *) dstu = *(const u16 *) srcu;
srcu = (uword) ((const u16 *) srcu + 1);
dstu = (uword) ((u16 *) dstu + 1);
}
if (n & 0x04)
{
*(u32 *) dstu = *(const u32 *) srcu;
srcu = (uword) ((const u32 *) srcu + 1);
dstu = (uword) ((u32 *) dstu + 1);
}
if (n & 0x08)
{
*(u64 *) dstu = *(const u64 *) 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 <= 48)
{
clib_mov32 ((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_mov16 ((u8 *) dst + 32, (const u8 *) src + 32);
clib_mov16 ((u8 *) dst - 16 + n, (const u8 *) src - 16 + n);
return ret;
}
if (n <= 128)
{
goto COPY_BLOCK_128_BACK15;
}
if (n <= 512)
{
if (n >= 256)
{
n -= 256;
clib_mov128 ((u8 *) dst, (const u8 *) src);
clib_mov128 ((u8 *) dst + 128, (const u8 *) src + 128);
src = (const u8 *) src + 256;
dst = (u8 *) dst + 256;
}
COPY_BLOCK_255_BACK15:
if (n >= 128)
{
n -= 128;
clib_mov128 ((u8 *) dst, (const u8 *) src);
src = (const u8 *) src + 128;
dst = (u8 *) dst + 128;
}
COPY_BLOCK_128_BACK15:
if (n >= 64)
{
n -= 64;
clib_mov64 ((u8 *) dst, (const u8 *) src);
src = (const u8 *) src + 64;
dst = (u8 *) dst + 64;
}
COPY_BLOCK_64_BACK15:
if (n >= 32)
{
n -= 32;
clib_mov32 ((u8 *) dst, (const u8 *) src);
src = (const u8 *) src + 32;
dst = (u8 *) dst + 32;
}
if (n > 16)
{
clib_mov16 ((u8 *) dst, (const u8 *) src);
clib_mov16 ((u8 *) dst - 16 + n, (const u8 *) src - 16 + n);
return ret;
}
if (n > 0)
{
clib_mov16 ((u8 *) dst - 16 + n, (const u8 *) 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 - ((uword) dst & 0x0F) + 16;
n -= dstofss;
clib_mov32 ((u8 *) dst, (const u8 *) src);
src = (const u8 *) src + dstofss;
dst = (u8 *) dst + dstofss;
srcofs = ((uword) src & 0x0F);
/**
* For aligned copy
*/
if (srcofs == 0)
{
/**
* Copy 256-byte blocks
*/
for (; n >= 256; n -= 256)
{
clib_mov256 ((u8 *) dst, (const u8 *) src);
dst = (u8 *) dst + 256;
src = (const u8 *) src + 256;
}
/**
* Copy whatever left
*/
goto COPY_BLOCK_255_BACK15;
}
/**
* For copy with unaligned load
*/
CLIB_MVUNALIGN_LEFT47 (dst, src, n, srcofs);
/**
* Copy whatever left
*/
goto COPY_BLOCK_64_BACK15;
}
#undef CLIB_MVUNALIGN_LEFT47_IMM
#undef CLIB_MVUNALIGN_LEFT47
#endif /* included_clib_memcpy_sse3_h */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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