aboutsummaryrefslogtreecommitdiffstats
path: root/contrib/libs/crcutil/uint128_sse2.h
blob: 0fcc7255ed50dd578fdd4eca36e439b8ddc8d6b1 (plain) (blame)
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
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
// Copyright 2010 Google Inc.  All rights reserved. 
// 
// 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. 
 
// Implements a limited set of 128-bit arithmetic operations 
// (the ones that are used by CRC) using SSE2 intrinsics. 
 
#ifndef CRCUTIL_UINT128_SSE2_H_ 
#define CRCUTIL_UINT128_SSE2_H_ 
 
#include "base_types.h" 
#include "crc_casts.h"      // Downcast, CrcFromUint64, Uint64FromCrc 
#include "platform.h" 
 
#if HAVE_SSE2 
 
namespace crcutil { 
 
// Specialized functions handling __m128i. 
template<> __forceinline uint64 Downcast(const __m128i &value) { 
#if HAVE_AMD64 && defined(__GNUC__) 
    // GCC 4.4.x is too smart and, instead of MOVQ, generates SSE4 PEXTRQ 
    // instruction when the code is compiled with -mmsse4. 
    // Fixed in 4.5 which generates conversion through memory (why?). 
    // And -- yes, it makes quite measurable difference. 
    uint64 temp; 
    asm(SSE2_MOVQ " %[i128], %[u64]\n" : [u64] "=r" (temp) : [i128] "x" (value)); 
    return temp; 
#elif HAVE_AMD64 && (!defined(_MSC_FULL_VER) || _MSC_FULL_VER > 150030729) 
    return static_cast<uint64>(_mm_cvtsi128_si64(value)); 
#else 
    // 64-bit CL 15.00.30729.1 -O2 generates incorrect code (tests fail). 
    // _mm_cvtsi128_si64() is not available on i386. 
    uint64 temp; 
    _mm_storel_epi64(reinterpret_cast<__m128i *>(&temp), value); 
    return temp; 
#endif 
} 
 
 
class uint128_sse2 { 
 public: 
  uint128_sse2() {} 
  ~uint128_sse2() {} 
 
  // Default casts to uint128_sse2 and assignment operator. 
  __forceinline void operator =(uint64 value) { 
#if HAVE_AMD64 && defined(__GNUC__) && !GCC_VERSION_AVAILABLE(4, 5) 
    // Prevent generation of SSE4 pinsrq insruction when 
    // compiling with GCC 4.4.x with -msse4 flag. 
    asm(SSE2_MOVQ " %[u64], %[i128]\n" : [i128] "=x" (x_) : [u64] "r" (value)); 
#elif HAVE_AMD64 
    x_ = _mm_cvtsi64_si128(static_cast<int64>(value)); 
#else 
    x_ = _mm_loadl_epi64(reinterpret_cast<const __m128i *>(&value)); 
#endif 
  } 
  __forceinline uint128_sse2(uint64 x) { 
    *this = x; 
  } 
  __forceinline uint128_sse2(const __m128i x) : x_(x) { 
  } 
  __forceinline operator __m128i() const { 
    return x_; 
  } 
  __forceinline void operator =(const uint128_sse2 &x) { 
    x_ = x.x_; 
  } 
 
  // Extracts 64 less significant bits. 
  __forceinline uint64 to_uint64() const { 
    return Downcast<__m128i, uint64>(x_); 
  } 
 
  // Comparisons. 
  __forceinline bool operator ==(const uint128_sse2 &y) const { 
    union { 
      __m128i i128; 
      uint64  u64[2]; 
    } t; 
    t.i128 = _mm_xor_si128(x_, y.x_); 
    return (t.u64[0] | t.u64[1]) == 0; 
  } 
  __forceinline bool operator ==(uint64 value) const { 
    union { 
      __m128i i128; 
      uint64  u64[2]; 
    } t; 
    t.i128 = x_; 
    return (t.u64[0] == value && t.u64[1] == 0); 
  } 
  __forceinline bool operator !=(const uint128_sse2 &y) const { 
    union { 
      __m128i i128; 
      uint64  u64[2]; 
    } t; 
    t.i128 = _mm_xor_si128(x_, y.x_); 
    return (t.u64[0] | t.u64[1]) != 0; 
  } 
  __forceinline bool operator !=(uint64 value) const { 
    union { 
      __m128i i128; 
      uint64  u64[2]; 
    } t; 
    t.i128 = x_; 
    return (t.u64[0] != value || t.u64[1] != 0); 
  } 
 
  __forceinline bool operator <(const uint128_sse2 &y) const { 
    union { 
      __m128i i128; 
      uint64  u64[2]; 
    } xx, yy; 
    xx.i128 = x_; 
    yy.i128 = y.x_; 
    return (xx.u64[0] < yy.u64[0] || 
           (xx.u64[0] == yy.u64[0] && xx.u64[1] < yy.u64[1])); 
  } 
 
  // Bitwise logic operators. 
  __forceinline uint128_sse2 operator ^(const uint128_sse2 &y) const { 
    return _mm_xor_si128(x_, y.x_); 
  } 
  __forceinline uint128_sse2 operator &(const uint128_sse2 &y) const { 
    return _mm_and_si128(x_, y.x_); 
  } 
  __forceinline uint128_sse2 operator |(const uint128_sse2 &y) const { 
    return _mm_or_si128(x_, y.x_); 
  } 
 
  __forceinline void operator ^=(const uint128_sse2 &y) { 
    *this = *this ^ y.x_; 
  } 
  __forceinline void operator &=(const uint128_sse2 &y) { 
    *this = *this & y.x_; 
  } 
  __forceinline void operator |=(const uint128_sse2 &y) { 
    *this = *this | y.x_; 
  } 
 
  // Arithmetic operators. 
  __forceinline uint128_sse2 operator +(uint64 y) const { 
    union { 
      __m128i i128; 
      uint64  u64[2]; 
    } temp; 
    temp.i128 = x_; 
    // a + b >= 2**64 iff 
    // a + b > (2**64 - 1) iff 
    // a > (2**64 - 1) - b iff 
    // a > ~b 
    if (temp.u64[0] > ~y) { 
      temp.u64[1] += 1; 
    } 
    temp.u64[0] += y; 
    return temp.i128; 
  } 
  __forceinline void operator +=(uint64 x) { 
    *this = *this + x; 
  } 
  __forceinline uint128_sse2 operator -(uint64 y) const { 
    union { 
      __m128i i128; 
      uint64  u64[2]; 
    } temp; 
    temp.i128 = x_; 
    if (temp.u64[0] < y) { 
      temp.u64[1] -= 1; 
    } 
    temp.u64[0] -= y; 
    return temp.i128; 
  } 
  __forceinline void operator -=(uint64 x) { 
    *this = *this - x; 
  } 
 
  // Bitwise logical shifts. 
  __forceinline uint128_sse2 operator >>(const int bits) const { 
    if (bits == 8) { 
      return _mm_srli_si128(x_, 1); 
    } else if (bits == 16) { 
      return _mm_srli_si128(x_, 2); 
    } else if (bits == 32) { 
      return _mm_srli_si128(x_, 4); 
    } else if (bits == 64) { 
      return _mm_srli_si128(x_, 8); 
    } else { 
      return long_shift_right(bits); 
    } 
  } 
  __forceinline uint128_sse2 operator >>(const size_t bits) const { 
    return *this >> static_cast<int>(bits); 
  } 
  __forceinline void operator >>=(const int bits) { 
    *this = *this >> bits; 
  } 
  __forceinline void operator >>=(const size_t bits) { 
    *this = *this >> static_cast<int>(bits); 
  } 
 
  __forceinline uint128_sse2 operator <<(int bits) const { 
    if (bits == 8) { 
      return _mm_slli_si128(x_, 1); 
    } else if (bits == 16) { 
      return _mm_slli_si128(x_, 2); 
    } else if (bits == 32) { 
      return _mm_slli_si128(x_, 4); 
    } else if (bits == 64) { 
      return _mm_slli_si128(x_, 8); 
    } else { 
      return long_shift_left(bits); 
    } 
  } 
  __forceinline uint128_sse2 operator <<(size_t bits) const { 
    return *this << static_cast<int>(bits); 
  } 
  __forceinline void operator <<=(int bits) { 
    *this = *this << bits; 
  } 
  __forceinline void operator <<=(size_t bits) { 
    *this = *this << static_cast<int>(bits); 
  } 
 
 protected: 
  __forceinline uint128_sse2 long_shift_right(int bits) const { 
    union { 
      __m128i i128; 
      uint64 u64[2]; 
    } x; 
    x.i128 = x_; 
    for (; bits > 0; --bits) { 
      x.u64[0] >>= 1; 
      if (x.u64[1] & 1) { 
        x.u64[0] |= static_cast<uint64>(1) << 63; 
      } 
      x.u64[1] >>= 1; 
    } 
    return x.i128; 
  } 
 
  __forceinline uint128_sse2 long_shift_left(int bits) const { 
    union { 
      __m128i i128; 
      int64   i64[2]; 
    } x; 
    x.i128 = x_; 
    for (; bits > 0; --bits) { 
      x.i64[1] <<= 1; 
      if (x.i64[0] < 0) { 
        x.i64[1] |= 1; 
      } 
      x.i64[0] <<= 1; 
    } 
    return x.i128; 
  } 
 
  __m128i x_; 
} GCC_ALIGN_ATTRIBUTE(16); 
 
 
// Specialized versions. 
template<> __forceinline uint64 Downcast(const uint128_sse2 &x) { 
  return x.to_uint64(); 
} 
template<> __forceinline uint32 Downcast(const uint128_sse2 &x) { 
  return static_cast<uint32>(x.to_uint64()); 
} 
template<> __forceinline uint16 Downcast(const uint128_sse2 &x) { 
  return static_cast<uint16>(x.to_uint64()); 
} 
template<> __forceinline uint8 Downcast(const uint128_sse2 &x) { 
  return static_cast<uint8>(x.to_uint64()); 
} 
 
template<> __forceinline uint128_sse2 CrcFromUint64(uint64 lo, uint64 hi) { 
  union { 
    __m128i i128; 
    uint64  u64[2]; 
  } temp; 
  temp.u64[0] = lo; 
  temp.u64[1] = hi; 
  return temp.i128; 
} 
 
template<> __forceinline void Uint64FromCrc(const uint128_sse2 &crc, 
                              uint64 *lo, uint64 *hi) { 
  union { 
    __m128i i128; 
    uint64  u64[2]; 
  } temp; 
  temp.i128 = crc; 
  *lo = temp.u64[0]; 
  *hi = temp.u64[1]; 
} 
 
}  // namespace crcutil 
 
#endif  // HAVE_SSE2 
 
#endif  // CRCUTIL_UINT128_SSE2_H_