summaryrefslogtreecommitdiffstats
path: root/src/vppinfra/memcpy_avx512.h
blob: 67982500b6c5dbda3001e087fcd1e171f547b60f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
/*
 * 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_avx512_h
#define included_clib_memcpy_avx512_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)
{
  __m512i zmm0;

  zmm0 = _mm512_loadu_si512 ((const void *) src);
  _mm512_storeu_si512 ((void *) dst, zmm0);
}

static inline void
clib_mov128 (u8 * dst, const u8 * src)
{
  clib_mov64 (dst + 0 * 64, src + 0 * 64);
  clib_mov64 (dst + 1 * 64, src + 1 * 64);
}

static inline void
clib_mov256 (u8 * dst, const u8 * src)
{
  clib_mov128 (dst + 0 * 128, src + 0 * 128);
  clib_mov128 (dst + 1 * 128, src + 1 * 128);
}

static inline void
clib_mov128blocks (u8 * dst, const u8 * src, size_t n)
{
  __m512i zmm0, zmm1;

  while (n >= 128)
    {
      zmm0 = _mm512_loadu_si512 ((const void *) (src + 0 * 64));
      n -= 128;
      zmm1 = _mm512_loadu_si512 ((const void *) (src + 1 * 64));
      src = src + 128;
      _mm512_storeu_si512 ((void *) (dst + 0 * 64), zmm0);
      _mm512_storeu_si512 ((void *) (dst + 1 * 64), zmm1);
      dst = dst + 128;
    }
}

static inline void
clib_mov512blocks (u8 * dst, const u8 * src, size_t n)
{
  __m512i zmm0, zmm1, zmm2, zmm3, zmm4, zmm5, zmm6, zmm7;

  while (n >= 512)
    {
      zmm0 = _mm512_loadu_si512 ((const void *) (src + 0 * 64));
      n -= 512;
      zmm1 = _mm512_loadu_si512 ((const void *) (src + 1 * 64));
      zmm2 = _mm512_loadu_si512 ((const void *) (src + 2 * 64));
      zmm3 = _mm512_loadu_si512 ((const void *) (src + 3 * 64));
      zmm4 = _mm512_loadu_si512 ((const void *) (src + 4 * 64));
      zmm5 = _mm512_loadu_si512 ((const void *) (src + 5 * 64));
      zmm6 = _mm512_loadu_si512 ((const void *) (src + 6 * 64));
      zmm7 = _mm512_loadu_si512 ((const void *) (src + 7 * 64));
      src = src + 512;
      _mm512_storeu_si512 ((void *) (dst + 0 * 64), zmm0);
      _mm512_storeu_si512 ((void *) (dst + 1 * 64), zmm1);
      _mm512_storeu_si512 ((void *) (dst + 2 * 64), zmm2);
      _mm512_storeu_si512 ((void *) (dst + 3 * 64), zmm3);
      _mm512_storeu_si512 ((void *) (dst + 4 * 64), zmm4);
      _mm512_storeu_si512 ((void *) (dst + 5 * 64), zmm5);
      _mm512_storeu_si512 ((void *) (dst + 6 * 64), zmm6);
      _mm512_storeu_si512 ((void *) (dst + 7 * 64), zmm7);
      dst = dst + 512;
    }
}

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)
	{
	  *(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 <= 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;
	}
    COPY_BLOCK_128_BACK63:
      if (n > 64)
	{
	  clib_mov64 ((u8 *) dst, (const u8 *) src);
	  clib_mov64 ((u8 *) dst - 64 + n, (const u8 *) src - 64 + n);
	  return ret;
	}
      if (n > 0)
	clib_mov64 ((u8 *) dst - 64 + n, (const u8 *) src - 64 + n);
      return ret;
    }

	/**
         * Make store aligned when copy size exceeds 512 bytes
         */
  dstofss = (uword) dst & 0x3F;
  if (dstofss > 0)
    {
      dstofss = 64 - dstofss;
      n -= dstofss;
      clib_mov64 ((u8 *) dst, (const u8 *) src);
      src = (const u8 *) src + dstofss;
      dst = (u8 *) dst + dstofss;
    }

	/**
         * Copy 512-byte blocks.
         * Use copy block function for better instruction order control,
         * which is important when load is unaligned.
         */
  clib_mov512blocks ((u8 *) dst, (const u8 *) src, n);
  bits = n;
  n = n & 511;
  bits -= n;
  src = (const u8 *) src + bits;
  dst = (u8 *) 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)
    {
      clib_mov128blocks ((u8 *) dst, (const u8 *) src, n);
      bits = n;
      n = n & 127;
      bits -= n;
      src = (const u8 *) src + bits;
      dst = (u8 *) dst + bits;
    }

	/**
         * Copy whatever left
         */
  goto COPY_BLOCK_128_BACK63;
}


#endif /* included_clib_memcpy_avx512_h */


/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */