aboutsummaryrefslogtreecommitdiffstats
path: root/src/vppinfra/vector/compress.h
blob: d2ed716ac8ea1c35612ec45f172de856e74deb21 (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
/* SPDX-License-Identifier: Apache-2.0
 * Copyright(c) 2021 Cisco Systems, Inc.
 */

#ifndef included_vector_compress_h
#define included_vector_compress_h
#include <vppinfra/clib.h>
#include <vppinfra/memcpy.h>

static_always_inline u64 *
clib_compress_u64_x64 (u64 *dst, u64 *src, u64 mask)
{
#if defined(CLIB_HAVE_VEC512_COMPRESS)
  u64x8u *sv = (u64x8u *) src;
  for (int i = 0; i < 8; i++)
    {
      u64x8_compress_store (sv[i], mask, dst);
      dst += _popcnt32 ((u8) mask);
      mask >>= 8;
    }
#elif defined(CLIB_HAVE_VEC256_COMPRESS)
  u64x4u *sv = (u64x4u *) src;
  for (int i = 0; i < 16; i++)
    {
      u64x4_compress_store (sv[i], mask, dst);
      dst += _popcnt32 (((u8) mask) & 0x0f);
      mask >>= 4;
    }
#else
  u32 i;
  foreach_set_bit_index (i, mask)
    dst++[0] = src[i];
#endif
  return dst;
}

/** \brief Compress array of 64-bit elemments into destination array based on
 * mask

    @param dst destination array of u64 elements
    @param src source array of u64 elements
    @param mask array of u64 values representing compress mask
    @param n_elts number of elements in the source array
    @return number of elements stored in destionation array
*/

static_always_inline u32
clib_compress_u64 (u64 *dst, u64 *src, u64 *mask, u32 n_elts)
{
  u64 *dst0 = dst;
  while (n_elts >= 64)
    {
      if (mask[0] == ~0ULL)
	{
	  clib_memcpy_fast (dst, src, 64 * sizeof (u64));
	  dst += 64;
	}
      else
	dst = clib_compress_u64_x64 (dst, src, mask[0]);

      mask++;
      src += 64;
      n_elts -= 64;
    }

  if (PREDICT_TRUE (n_elts == 0))
    return dst - dst0;

  return clib_compress_u64_x64 (dst, src, mask[0] & pow2_mask (n_elts)) - dst0;
}

static_always_inline u32 *
clib_compress_u32_x64 (u32 *dst, u32 *src, u64 mask)
{
#if defined(CLIB_HAVE_VEC512_COMPRESS)
  u32x16u *sv = (u32x16u *) src;
  for (int i = 0; i < 4; i++)
    {
      u32x16_compress_store (sv[i], mask, dst);
      dst += _popcnt32 ((u16) mask);
      mask >>= 16;
    }

#elif defined(CLIB_HAVE_VEC256_COMPRESS)
  u32x8u *sv = (u32x8u *) src;
  for (int i = 0; i < 8; i++)
    {
      u32x8_compress_store (sv[i], mask, dst);
      dst += _popcnt32 ((u8) mask);
      mask >>= 8;
    }
#else
  u32 i;
  foreach_set_bit_index (i, mask)
    dst++[0] = src[i];
#endif
  return dst;
}

/** \brief Compress array of 32-bit elemments into destination array based on
 * mask

    @param dst destination array of u32 elements
    @param src source array of u32 elements
    @param mask array of u64 values representing compress mask
    @param n_elts number of elements in the source array
    @return number of elements stored in destionation array
*/

static_always_inline u32
clib_compress_u32 (u32 *dst, u32 *src, u64 *mask, u32 n_elts)
{
  u32 *dst0 = dst;
  while (n_elts >= 64)
    {
      if (mask[0] == ~0ULL)
	{
	  clib_memcpy_u32 (dst, src, 64);
	  dst += 64;
	}
      else
	dst = clib_compress_u32_x64 (dst, src, mask[0]);

      mask++;
      src += 64;
      n_elts -= 64;
    }

  if (PREDICT_TRUE (n_elts == 0))
    return dst - dst0;

  return clib_compress_u32_x64 (dst, src, mask[0] & pow2_mask (n_elts)) - dst0;
}

static_always_inline u16 *
clib_compress_u16_x64 (u16 *dst, u16 *src, u64 mask)
{
#if defined(CLIB_HAVE_VEC512_COMPRESS_U8_U16)
  u16x32u *sv = (u16x32u *) src;
  for (int i = 0; i < 2; i++)
    {
      u16x32_compress_store (sv[i], mask, dst);
      dst += _popcnt32 ((u32) mask);
      mask >>= 32;
    }
#else
  u32 i;
  foreach_set_bit_index (i, mask)
    dst++[0] = src[i];
#endif
  return dst;
}

/** \brief Compress array of 16-bit elemments into destination array based on
 * mask

    @param dst destination array of u16 elements
    @param src source array of u16 elements
    @param mask array of u64 values representing compress mask
    @param n_elts number of elements in the source array
    @return number of elements stored in destionation array
*/

static_always_inline u32
clib_compress_u16 (u16 *dst, u16 *src, u64 *mask, u32 n_elts)
{
  u16 *dst0 = dst;
  while (n_elts >= 64)
    {
      if (mask[0] == ~0ULL)
	{
	  clib_memcpy_fast (dst, src, 64 * sizeof (u16));
	  dst += 64;
	}
      else
	dst = clib_compress_u16_x64 (dst, src, mask[0]);

      mask++;
      src += 64;
      n_elts -= 64;
    }

  if (PREDICT_TRUE (n_elts == 0))
    return dst - dst0;

  return clib_compress_u16_x64 (dst, src, mask[0] & pow2_mask (n_elts)) - dst0;
}

static_always_inline u8 *
clib_compress_u8_x64 (u8 *dst, u8 *src, u64 mask)
{
#if defined(CLIB_HAVE_VEC512_COMPRESS_U8_U16)
  u8x64u *sv = (u8x64u *) src;
  u8x64_compress_store (sv[0], mask, dst);
  dst += _popcnt64 (mask);
#else
  u32 i;
  foreach_set_bit_index (i, mask)
    dst++[0] = src[i];
#endif
  return dst;
}

/** \brief Compress array of 8-bit elemments into destination array based on
 * mask

    @param dst destination array of u8 elements
    @param src source array of u8 elements
    @param mask array of u64 values representing compress mask
    @param n_elts number of elements in the source array
    @return number of elements stored in destionation array
*/

static_always_inline u32
clib_compress_u8 (u8 *dst, u8 *src, u64 *mask, u32 n_elts)
{
  u8 *dst0 = dst;
  while (n_elts >= 64)
    {
      if (mask[0] == ~0ULL)
	{
	  clib_memcpy_fast (dst, src, 64);
	  dst += 64;
	}
      else
	dst = clib_compress_u8_x64 (dst, src, mask[0]);

      mask++;
      src += 64;
      n_elts -= 64;
    }

  if (PREDICT_TRUE (n_elts == 0))
    return dst - dst0;

  return clib_compress_u8_x64 (dst, src, mask[0] & pow2_mask (n_elts)) - dst0;
}

#endif