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| 1 /* | |
| 2 * Compute the CRC32 using a parallelized folding approach with the PCLMULQDQ | |
| 3 * instruction. | |
| 4 * | |
| 5 * A white paper describing this algorithm can be found at: | |
| 6 * http://www.intel.com/content/dam/www/public/us/en/documents/white-papers/fast
-crc-computation-generic-polynomials-pclmulqdq-paper.pdf | |
| 7 * | |
| 8 * Copyright (C) 2013 Intel Corporation. All rights reserved. | |
| 9 * Authors: | |
| 10 * Wajdi Feghali <wajdi.k.feghali@intel.com> | |
| 11 * Jim Guilford <james.guilford@intel.com> | |
| 12 * Vinodh Gopal <vinodh.gopal@intel.com> | |
| 13 * Erdinc Ozturk <erdinc.ozturk@intel.com> | |
| 14 * Jim Kukunas <james.t.kukunas@linux.intel.com> | |
| 15 * | |
| 16 * For conditions of distribution and use, see copyright notice in zlib.h | |
| 17 */ | |
| 18 | |
| 19 #include "deflate.h" | |
| 20 | |
| 21 #include <inttypes.h> | |
| 22 #include <emmintrin.h> | |
| 23 #include <immintrin.h> | |
| 24 #include <wmmintrin.h> | |
| 25 | |
| 26 #define CRC_LOAD(s) \ | |
| 27 do { \ | |
| 28 __m128i xmm_crc0 = _mm_loadu_si128((__m128i *)s->crc0 + 0);\ | |
| 29 __m128i xmm_crc1 = _mm_loadu_si128((__m128i *)s->crc0 + 1);\ | |
| 30 __m128i xmm_crc2 = _mm_loadu_si128((__m128i *)s->crc0 + 2);\ | |
| 31 __m128i xmm_crc3 = _mm_loadu_si128((__m128i *)s->crc0 + 3);\ | |
| 32 __m128i xmm_crc_part = _mm_loadu_si128((__m128i *)s->crc0 + 4); | |
| 33 | |
| 34 #define CRC_SAVE(s) \ | |
| 35 _mm_storeu_si128((__m128i *)s->crc0 + 0, xmm_crc0);\ | |
| 36 _mm_storeu_si128((__m128i *)s->crc0 + 1, xmm_crc1);\ | |
| 37 _mm_storeu_si128((__m128i *)s->crc0 + 2, xmm_crc2);\ | |
| 38 _mm_storeu_si128((__m128i *)s->crc0 + 3, xmm_crc3);\ | |
| 39 _mm_storeu_si128((__m128i *)s->crc0 + 4, xmm_crc_part);\ | |
| 40 } while (0); | |
| 41 | |
| 42 ZLIB_INTERNAL void crc_fold_init(deflate_state *const s) | |
| 43 { | |
| 44 CRC_LOAD(s) | |
| 45 | |
| 46 xmm_crc0 = _mm_cvtsi32_si128(0x9db42487); | |
| 47 xmm_crc1 = _mm_setzero_si128(); | |
| 48 xmm_crc2 = _mm_setzero_si128(); | |
| 49 xmm_crc3 = _mm_setzero_si128(); | |
| 50 | |
| 51 CRC_SAVE(s) | |
| 52 | |
| 53 s->strm->adler = 0; | |
| 54 } | |
| 55 | |
| 56 local void fold_1(deflate_state *const s, | |
| 57 __m128i *xmm_crc0, __m128i *xmm_crc1, | |
| 58 __m128i *xmm_crc2, __m128i *xmm_crc3) | |
| 59 { | |
| 60 const __m128i xmm_fold4 = _mm_set_epi32( | |
| 61 0x00000001, 0x54442bd4, | |
| 62 0x00000001, 0xc6e41596); | |
| 63 | |
| 64 __m128i x_tmp3; | |
| 65 __m128 ps_crc0, ps_crc3, ps_res; | |
| 66 | |
| 67 x_tmp3 = *xmm_crc3; | |
| 68 | |
| 69 *xmm_crc3 = *xmm_crc0; | |
| 70 *xmm_crc0 = _mm_clmulepi64_si128(*xmm_crc0, xmm_fold4, 0x01); | |
| 71 *xmm_crc3 = _mm_clmulepi64_si128(*xmm_crc3, xmm_fold4, 0x10); | |
| 72 ps_crc0 = _mm_castsi128_ps(*xmm_crc0); | |
| 73 ps_crc3 = _mm_castsi128_ps(*xmm_crc3); | |
| 74 ps_res = _mm_xor_ps(ps_crc0, ps_crc3); | |
| 75 | |
| 76 *xmm_crc0 = *xmm_crc1; | |
| 77 *xmm_crc1 = *xmm_crc2; | |
| 78 *xmm_crc2 = x_tmp3; | |
| 79 *xmm_crc3 = _mm_castps_si128(ps_res); | |
| 80 } | |
| 81 | |
| 82 local void fold_2(deflate_state *const s, | |
| 83 __m128i *xmm_crc0, __m128i *xmm_crc1, | |
| 84 __m128i *xmm_crc2, __m128i *xmm_crc3) | |
| 85 { | |
| 86 const __m128i xmm_fold4 = _mm_set_epi32( | |
| 87 0x00000001, 0x54442bd4, | |
| 88 0x00000001, 0xc6e41596); | |
| 89 | |
| 90 __m128i x_tmp3, x_tmp2; | |
| 91 __m128 ps_crc0, ps_crc1, ps_crc2, ps_crc3, ps_res31, ps_res20; | |
| 92 | |
| 93 x_tmp3 = *xmm_crc3; | |
| 94 x_tmp2 = *xmm_crc2; | |
| 95 | |
| 96 *xmm_crc3 = *xmm_crc1; | |
| 97 *xmm_crc1 = _mm_clmulepi64_si128(*xmm_crc1, xmm_fold4, 0x01); | |
| 98 *xmm_crc3 = _mm_clmulepi64_si128(*xmm_crc3, xmm_fold4, 0x10); | |
| 99 ps_crc3 = _mm_castsi128_ps(*xmm_crc3); | |
| 100 ps_crc1 = _mm_castsi128_ps(*xmm_crc1); | |
| 101 ps_res31= _mm_xor_ps(ps_crc3, ps_crc1); | |
| 102 | |
| 103 *xmm_crc2 = *xmm_crc0; | |
| 104 *xmm_crc0 = _mm_clmulepi64_si128(*xmm_crc0, xmm_fold4, 0x01); | |
| 105 *xmm_crc2 = _mm_clmulepi64_si128(*xmm_crc2, xmm_fold4, 0x10); | |
| 106 ps_crc0 = _mm_castsi128_ps(*xmm_crc0); | |
| 107 ps_crc2 = _mm_castsi128_ps(*xmm_crc2); | |
| 108 ps_res20= _mm_xor_ps(ps_crc0, ps_crc2); | |
| 109 | |
| 110 *xmm_crc0 = x_tmp2; | |
| 111 *xmm_crc1 = x_tmp3; | |
| 112 *xmm_crc2 = _mm_castps_si128(ps_res20); | |
| 113 *xmm_crc3 = _mm_castps_si128(ps_res31); | |
| 114 } | |
| 115 | |
| 116 local void fold_3(deflate_state *const s, | |
| 117 __m128i *xmm_crc0, __m128i *xmm_crc1, | |
| 118 __m128i *xmm_crc2, __m128i *xmm_crc3) | |
| 119 { | |
| 120 const __m128i xmm_fold4 = _mm_set_epi32( | |
| 121 0x00000001, 0x54442bd4, | |
| 122 0x00000001, 0xc6e41596); | |
| 123 | |
| 124 __m128i x_tmp3; | |
| 125 __m128 ps_crc0, ps_crc1, ps_crc2, ps_crc3, ps_res32, ps_res21, ps_res10; | |
| 126 | |
| 127 x_tmp3 = *xmm_crc3; | |
| 128 | |
| 129 *xmm_crc3 = *xmm_crc2; | |
| 130 *xmm_crc2 = _mm_clmulepi64_si128(*xmm_crc2, xmm_fold4, 0x01); | |
| 131 *xmm_crc3 = _mm_clmulepi64_si128(*xmm_crc3, xmm_fold4, 0x10); | |
| 132 ps_crc2 = _mm_castsi128_ps(*xmm_crc2); | |
| 133 ps_crc3 = _mm_castsi128_ps(*xmm_crc3); | |
| 134 ps_res32 = _mm_xor_ps(ps_crc2, ps_crc3); | |
| 135 | |
| 136 *xmm_crc2 = *xmm_crc1; | |
| 137 *xmm_crc1 = _mm_clmulepi64_si128(*xmm_crc1, xmm_fold4, 0x01); | |
| 138 *xmm_crc2 = _mm_clmulepi64_si128(*xmm_crc2, xmm_fold4, 0x10); | |
| 139 ps_crc1 = _mm_castsi128_ps(*xmm_crc1); | |
| 140 ps_crc2 = _mm_castsi128_ps(*xmm_crc2); | |
| 141 ps_res21= _mm_xor_ps(ps_crc1, ps_crc2); | |
| 142 | |
| 143 *xmm_crc1 = *xmm_crc0; | |
| 144 *xmm_crc0 = _mm_clmulepi64_si128(*xmm_crc0, xmm_fold4, 0x01); | |
| 145 *xmm_crc1 = _mm_clmulepi64_si128(*xmm_crc1, xmm_fold4, 0x10); | |
| 146 ps_crc0 = _mm_castsi128_ps(*xmm_crc0); | |
| 147 ps_crc1 = _mm_castsi128_ps(*xmm_crc1); | |
| 148 ps_res10= _mm_xor_ps(ps_crc0, ps_crc1); | |
| 149 | |
| 150 *xmm_crc0 = x_tmp3; | |
| 151 *xmm_crc1 = _mm_castps_si128(ps_res10); | |
| 152 *xmm_crc2 = _mm_castps_si128(ps_res21); | |
| 153 *xmm_crc3 = _mm_castps_si128(ps_res32); | |
| 154 } | |
| 155 | |
| 156 local void fold_4(deflate_state *const s, | |
| 157 __m128i *xmm_crc0, __m128i *xmm_crc1, | |
| 158 __m128i *xmm_crc2, __m128i *xmm_crc3) | |
| 159 { | |
| 160 const __m128i xmm_fold4 = _mm_set_epi32( | |
| 161 0x00000001, 0x54442bd4, | |
| 162 0x00000001, 0xc6e41596); | |
| 163 | |
| 164 __m128i x_tmp0, x_tmp1, x_tmp2, x_tmp3; | |
| 165 __m128 ps_crc0, ps_crc1, ps_crc2, ps_crc3; | |
| 166 __m128 ps_t0, ps_t1, ps_t2, ps_t3; | |
| 167 __m128 ps_res0, ps_res1, ps_res2, ps_res3; | |
| 168 | |
| 169 x_tmp0 = *xmm_crc0; | |
| 170 x_tmp1 = *xmm_crc1; | |
| 171 x_tmp2 = *xmm_crc2; | |
| 172 x_tmp3 = *xmm_crc3; | |
| 173 | |
| 174 *xmm_crc0 = _mm_clmulepi64_si128(*xmm_crc0, xmm_fold4, 0x01); | |
| 175 x_tmp0 = _mm_clmulepi64_si128(x_tmp0, xmm_fold4, 0x10); | |
| 176 ps_crc0 = _mm_castsi128_ps(*xmm_crc0); | |
| 177 ps_t0 = _mm_castsi128_ps(x_tmp0); | |
| 178 ps_res0 = _mm_xor_ps(ps_crc0, ps_t0); | |
| 179 | |
| 180 *xmm_crc1 = _mm_clmulepi64_si128(*xmm_crc1, xmm_fold4, 0x01); | |
| 181 x_tmp1 = _mm_clmulepi64_si128(x_tmp1, xmm_fold4, 0x10); | |
| 182 ps_crc1 = _mm_castsi128_ps(*xmm_crc1); | |
| 183 ps_t1 = _mm_castsi128_ps(x_tmp1); | |
| 184 ps_res1 = _mm_xor_ps(ps_crc1, ps_t1); | |
| 185 | |
| 186 *xmm_crc2 = _mm_clmulepi64_si128(*xmm_crc2, xmm_fold4, 0x01); | |
| 187 x_tmp2 = _mm_clmulepi64_si128(x_tmp2, xmm_fold4, 0x10); | |
| 188 ps_crc2 = _mm_castsi128_ps(*xmm_crc2); | |
| 189 ps_t2 = _mm_castsi128_ps(x_tmp2); | |
| 190 ps_res2 = _mm_xor_ps(ps_crc2, ps_t2); | |
| 191 | |
| 192 *xmm_crc3 = _mm_clmulepi64_si128(*xmm_crc3, xmm_fold4, 0x01); | |
| 193 x_tmp3 = _mm_clmulepi64_si128(x_tmp3, xmm_fold4, 0x10); | |
| 194 ps_crc3 = _mm_castsi128_ps(*xmm_crc3); | |
| 195 ps_t3 = _mm_castsi128_ps(x_tmp3); | |
| 196 ps_res3 = _mm_xor_ps(ps_crc3, ps_t3); | |
| 197 | |
| 198 *xmm_crc0 = _mm_castps_si128(ps_res0); | |
| 199 *xmm_crc1 = _mm_castps_si128(ps_res1); | |
| 200 *xmm_crc2 = _mm_castps_si128(ps_res2); | |
| 201 *xmm_crc3 = _mm_castps_si128(ps_res3); | |
| 202 } | |
| 203 | |
| 204 local const unsigned zalign(32) pshufb_shf_table[60] = { | |
| 205 0x84838281,0x88878685,0x8c8b8a89,0x008f8e8d, /* shl 15 (16 - 1)/shr1 */ | |
| 206 0x85848382,0x89888786,0x8d8c8b8a,0x01008f8e, /* shl 14 (16 - 3)/shr2 */ | |
| 207 0x86858483,0x8a898887,0x8e8d8c8b,0x0201008f, /* shl 13 (16 - 4)/shr3 */ | |
| 208 0x87868584,0x8b8a8988,0x8f8e8d8c,0x03020100, /* shl 12 (16 - 4)/shr4 */ | |
| 209 0x88878685,0x8c8b8a89,0x008f8e8d,0x04030201, /* shl 11 (16 - 5)/shr5 */ | |
| 210 0x89888786,0x8d8c8b8a,0x01008f8e,0x05040302, /* shl 10 (16 - 6)/shr6 */ | |
| 211 0x8a898887,0x8e8d8c8b,0x0201008f,0x06050403, /* shl 9 (16 - 7)/shr7 */ | |
| 212 0x8b8a8988,0x8f8e8d8c,0x03020100,0x07060504, /* shl 8 (16 - 8)/shr8 */ | |
| 213 0x8c8b8a89,0x008f8e8d,0x04030201,0x08070605, /* shl 7 (16 - 9)/shr9 */ | |
| 214 0x8d8c8b8a,0x01008f8e,0x05040302,0x09080706, /* shl 6 (16 -10)/shr10*/ | |
| 215 0x8e8d8c8b,0x0201008f,0x06050403,0x0a090807, /* shl 5 (16 -11)/shr11*/ | |
| 216 0x8f8e8d8c,0x03020100,0x07060504,0x0b0a0908, /* shl 4 (16 -12)/shr12*/ | |
| 217 0x008f8e8d,0x04030201,0x08070605,0x0c0b0a09, /* shl 3 (16 -13)/shr13*/ | |
| 218 0x01008f8e,0x05040302,0x09080706,0x0d0c0b0a, /* shl 2 (16 -14)/shr14*/ | |
| 219 0x0201008f,0x06050403,0x0a090807,0x0e0d0c0b /* shl 1 (16 -15)/shr15*/ | |
| 220 }; | |
| 221 | |
| 222 local void partial_fold(deflate_state *const s, const size_t len, | |
| 223 __m128i *xmm_crc0, __m128i *xmm_crc1, | |
| 224 __m128i *xmm_crc2, __m128i *xmm_crc3, | |
| 225 __m128i *xmm_crc_part) | |
| 226 { | |
| 227 | |
| 228 const __m128i xmm_fold4 = _mm_set_epi32( | |
| 229 0x00000001, 0x54442bd4, | |
| 230 0x00000001, 0xc6e41596); | |
| 231 const __m128i xmm_mask3 = _mm_set1_epi32(0x80808080); | |
| 232 | |
| 233 __m128i xmm_shl, xmm_shr, xmm_tmp1, xmm_tmp2, xmm_tmp3; | |
| 234 __m128i xmm_a0_0, xmm_a0_1; | |
| 235 __m128 ps_crc3, psa0_0, psa0_1, ps_res; | |
| 236 | |
| 237 xmm_shl = _mm_load_si128((__m128i *)pshufb_shf_table + (len - 1)); | |
| 238 xmm_shr = xmm_shl; | |
| 239 xmm_shr = _mm_xor_si128(xmm_shr, xmm_mask3); | |
| 240 | |
| 241 xmm_a0_0 = _mm_shuffle_epi8(*xmm_crc0, xmm_shl); | |
| 242 | |
| 243 *xmm_crc0 = _mm_shuffle_epi8(*xmm_crc0, xmm_shr); | |
| 244 xmm_tmp1 = _mm_shuffle_epi8(*xmm_crc1, xmm_shl); | |
| 245 *xmm_crc0 = _mm_or_si128(*xmm_crc0, xmm_tmp1); | |
| 246 | |
| 247 *xmm_crc1 = _mm_shuffle_epi8(*xmm_crc1, xmm_shr); | |
| 248 xmm_tmp2 = _mm_shuffle_epi8(*xmm_crc2, xmm_shl); | |
| 249 *xmm_crc1 = _mm_or_si128(*xmm_crc1, xmm_tmp2); | |
| 250 | |
| 251 *xmm_crc2 = _mm_shuffle_epi8(*xmm_crc2, xmm_shr); | |
| 252 xmm_tmp3 = _mm_shuffle_epi8(*xmm_crc3, xmm_shl); | |
| 253 *xmm_crc2 = _mm_or_si128(*xmm_crc2, xmm_tmp3); | |
| 254 | |
| 255 *xmm_crc3 = _mm_shuffle_epi8(*xmm_crc3, xmm_shr); | |
| 256 *xmm_crc_part = _mm_shuffle_epi8(*xmm_crc_part, xmm_shl); | |
| 257 *xmm_crc3 = _mm_or_si128(*xmm_crc3, *xmm_crc_part); | |
| 258 | |
| 259 xmm_a0_1 = _mm_clmulepi64_si128(xmm_a0_0, xmm_fold4, 0x10); | |
| 260 xmm_a0_0 = _mm_clmulepi64_si128(xmm_a0_0, xmm_fold4, 0x01); | |
| 261 | |
| 262 ps_crc3 = _mm_castsi128_ps(*xmm_crc3); | |
| 263 psa0_0 = _mm_castsi128_ps(xmm_a0_0); | |
| 264 psa0_1 = _mm_castsi128_ps(xmm_a0_1); | |
| 265 | |
| 266 ps_res = _mm_xor_ps(ps_crc3, psa0_0); | |
| 267 ps_res = _mm_xor_ps(ps_res, psa0_1); | |
| 268 | |
| 269 *xmm_crc3 = _mm_castps_si128(ps_res); | |
| 270 } | |
| 271 | |
| 272 ZLIB_INTERNAL void crc_fold_copy(deflate_state *const s, | |
| 273 unsigned char *dst, const unsigned char *src, long len) | |
| 274 { | |
| 275 unsigned long algn_diff; | |
| 276 __m128i xmm_t0, xmm_t1, xmm_t2, xmm_t3; | |
| 277 | |
| 278 CRC_LOAD(s) | |
| 279 | |
| 280 if (len < 16) { | |
| 281 if (len == 0) | |
| 282 return; | |
| 283 goto partial; | |
| 284 } | |
| 285 | |
| 286 algn_diff = 0 - (unsigned long)src & 0xF; | |
| 287 if (algn_diff) { | |
| 288 xmm_crc_part = _mm_loadu_si128((__m128i *)src); | |
| 289 _mm_storeu_si128((__m128i *)dst, xmm_crc_part); | |
| 290 | |
| 291 dst += algn_diff; | |
| 292 src += algn_diff; | |
| 293 len -= algn_diff; | |
| 294 | |
| 295 partial_fold(s, algn_diff, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3, | |
| 296 &xmm_crc_part); | |
| 297 } | |
| 298 | |
| 299 while ((len -= 64) >= 0) { | |
| 300 xmm_t0 = _mm_load_si128((__m128i *)src); | |
| 301 xmm_t1 = _mm_load_si128((__m128i *)src + 1); | |
| 302 xmm_t2 = _mm_load_si128((__m128i *)src + 2); | |
| 303 xmm_t3 = _mm_load_si128((__m128i *)src + 3); | |
| 304 | |
| 305 fold_4(s, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3); | |
| 306 | |
| 307 _mm_storeu_si128((__m128i *)dst, xmm_t0); | |
| 308 _mm_storeu_si128((__m128i *)dst + 1, xmm_t1); | |
| 309 _mm_storeu_si128((__m128i *)dst + 2, xmm_t2); | |
| 310 _mm_storeu_si128((__m128i *)dst + 3, xmm_t3); | |
| 311 | |
| 312 xmm_crc0 = _mm_xor_si128(xmm_crc0, xmm_t0); | |
| 313 xmm_crc1 = _mm_xor_si128(xmm_crc1, xmm_t1); | |
| 314 xmm_crc2 = _mm_xor_si128(xmm_crc2, xmm_t2); | |
| 315 xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_t3); | |
| 316 | |
| 317 src += 64; | |
| 318 dst += 64; | |
| 319 } | |
| 320 | |
| 321 /* | |
| 322 * len = num bytes left - 64 | |
| 323 */ | |
| 324 if (len + 16 >= 0) { | |
| 325 len += 16; | |
| 326 | |
| 327 xmm_t0 = _mm_load_si128((__m128i *)src); | |
| 328 xmm_t1 = _mm_load_si128((__m128i *)src + 1); | |
| 329 xmm_t2 = _mm_load_si128((__m128i *)src + 2); | |
| 330 | |
| 331 fold_3(s, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3); | |
| 332 | |
| 333 _mm_storeu_si128((__m128i *)dst, xmm_t0); | |
| 334 _mm_storeu_si128((__m128i *)dst + 1, xmm_t1); | |
| 335 _mm_storeu_si128((__m128i *)dst + 2, xmm_t2); | |
| 336 | |
| 337 xmm_crc1 = _mm_xor_si128(xmm_crc1, xmm_t0); | |
| 338 xmm_crc2 = _mm_xor_si128(xmm_crc2, xmm_t1); | |
| 339 xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_t2); | |
| 340 | |
| 341 if (len == 0) | |
| 342 goto done; | |
| 343 | |
| 344 dst += 48; | |
| 345 src += 48; | |
| 346 } else if (len + 32 >= 0) { | |
| 347 len += 32; | |
| 348 | |
| 349 xmm_t0 = _mm_load_si128((__m128i *)src); | |
| 350 xmm_t1 = _mm_load_si128((__m128i *)src + 1); | |
| 351 | |
| 352 fold_2(s, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3); | |
| 353 | |
| 354 _mm_storeu_si128((__m128i *)dst, xmm_t0); | |
| 355 _mm_storeu_si128((__m128i *)dst + 1, xmm_t1); | |
| 356 | |
| 357 xmm_crc2 = _mm_xor_si128(xmm_crc2, xmm_t0); | |
| 358 xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_t1); | |
| 359 | |
| 360 if (len == 0) | |
| 361 goto done; | |
| 362 | |
| 363 dst += 32; | |
| 364 src += 32; | |
| 365 } else if (len + 48 >= 0) { | |
| 366 len += 48; | |
| 367 | |
| 368 xmm_t0 = _mm_load_si128((__m128i *)src); | |
| 369 | |
| 370 fold_1(s, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3); | |
| 371 | |
| 372 _mm_storeu_si128((__m128i *)dst, xmm_t0); | |
| 373 | |
| 374 xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_t0); | |
| 375 | |
| 376 if (len == 0) | |
| 377 goto done; | |
| 378 | |
| 379 dst += 16; | |
| 380 src += 16; | |
| 381 } else { | |
| 382 len += 64; | |
| 383 if (len == 0) | |
| 384 goto done; | |
| 385 } | |
| 386 | |
| 387 partial: | |
| 388 | |
| 389 #if defined(_MSC_VER) | |
| 390 /* VS does not permit the use of _mm_set_epi64x in 32-bit builds */ | |
| 391 { | |
| 392 int32_t parts[4] = {0, 0, 0, 0}; | |
| 393 memcpy(&parts, src, len); | |
| 394 xmm_crc_part = _mm_set_epi32(parts[3], parts[2], parts[1], parts[0]); | |
| 395 } | |
| 396 #else | |
| 397 { | |
| 398 int64_t parts[2] = {0, 0}; | |
| 399 memcpy(&parts, src, len); | |
| 400 xmm_crc_part = _mm_set_epi64x(parts[1], parts[0]); | |
| 401 } | |
| 402 #endif | |
| 403 | |
| 404 _mm_storeu_si128((__m128i *)dst, xmm_crc_part); | |
| 405 partial_fold(s, len, &xmm_crc0, &xmm_crc1, &xmm_crc2, &xmm_crc3, | |
| 406 &xmm_crc_part); | |
| 407 done: | |
| 408 CRC_SAVE(s) | |
| 409 } | |
| 410 | |
| 411 local const unsigned zalign(16) crc_k[] = { | |
| 412 0xccaa009e, 0x00000000, /* rk1 */ | |
| 413 0x751997d0, 0x00000001, /* rk2 */ | |
| 414 0xccaa009e, 0x00000000, /* rk5 */ | |
| 415 0x63cd6124, 0x00000001, /* rk6 */ | |
| 416 0xf7011640, 0x00000001, /* rk7 */ | |
| 417 0xdb710640, 0x00000001 /* rk8 */ | |
| 418 }; | |
| 419 | |
| 420 local const unsigned zalign(16) crc_mask[4] = { | |
| 421 0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, 0x00000000 | |
| 422 }; | |
| 423 | |
| 424 local const unsigned zalign(16) crc_mask2[4] = { | |
| 425 0x00000000, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF | |
| 426 }; | |
| 427 | |
| 428 unsigned ZLIB_INTERNAL crc_fold_512to32(deflate_state *const s) | |
| 429 { | |
| 430 const __m128i xmm_mask = _mm_load_si128((__m128i *)crc_mask); | |
| 431 const __m128i xmm_mask2 = _mm_load_si128((__m128i *)crc_mask2); | |
| 432 | |
| 433 unsigned crc; | |
| 434 __m128i x_tmp0, x_tmp1, x_tmp2, crc_fold; | |
| 435 | |
| 436 CRC_LOAD(s) | |
| 437 | |
| 438 /* | |
| 439 * k1 | |
| 440 */ | |
| 441 crc_fold = _mm_load_si128((__m128i *)crc_k); | |
| 442 | |
| 443 x_tmp0 = _mm_clmulepi64_si128(xmm_crc0, crc_fold, 0x10); | |
| 444 xmm_crc0 = _mm_clmulepi64_si128(xmm_crc0, crc_fold, 0x01); | |
| 445 xmm_crc1 = _mm_xor_si128(xmm_crc1, x_tmp0); | |
| 446 xmm_crc1 = _mm_xor_si128(xmm_crc1, xmm_crc0); | |
| 447 | |
| 448 x_tmp1 = _mm_clmulepi64_si128(xmm_crc1, crc_fold, 0x10); | |
| 449 xmm_crc1 = _mm_clmulepi64_si128(xmm_crc1, crc_fold, 0x01); | |
| 450 xmm_crc2 = _mm_xor_si128(xmm_crc2, x_tmp1); | |
| 451 xmm_crc2 = _mm_xor_si128(xmm_crc2, xmm_crc1); | |
| 452 | |
| 453 x_tmp2 = _mm_clmulepi64_si128(xmm_crc2, crc_fold, 0x10); | |
| 454 xmm_crc2 = _mm_clmulepi64_si128(xmm_crc2, crc_fold, 0x01); | |
| 455 xmm_crc3 = _mm_xor_si128(xmm_crc3, x_tmp2); | |
| 456 xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc2); | |
| 457 | |
| 458 /* | |
| 459 * k5 | |
| 460 */ | |
| 461 crc_fold = _mm_load_si128((__m128i *)crc_k + 1); | |
| 462 | |
| 463 xmm_crc0 = xmm_crc3; | |
| 464 xmm_crc3 = _mm_clmulepi64_si128(xmm_crc3, crc_fold, 0); | |
| 465 xmm_crc0 = _mm_srli_si128(xmm_crc0, 8); | |
| 466 xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc0); | |
| 467 | |
| 468 xmm_crc0 = xmm_crc3; | |
| 469 xmm_crc3 = _mm_slli_si128(xmm_crc3, 4); | |
| 470 xmm_crc3 = _mm_clmulepi64_si128(xmm_crc3, crc_fold, 0x10); | |
| 471 xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc0); | |
| 472 xmm_crc3 = _mm_and_si128(xmm_crc3, xmm_mask2); | |
| 473 | |
| 474 /* | |
| 475 * k7 | |
| 476 */ | |
| 477 xmm_crc1 = xmm_crc3; | |
| 478 xmm_crc2 = xmm_crc3; | |
| 479 crc_fold = _mm_load_si128((__m128i *)crc_k + 2); | |
| 480 | |
| 481 xmm_crc3 = _mm_clmulepi64_si128(xmm_crc3, crc_fold, 0); | |
| 482 xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc2); | |
| 483 xmm_crc3 = _mm_and_si128(xmm_crc3, xmm_mask); | |
| 484 | |
| 485 xmm_crc2 = xmm_crc3; | |
| 486 xmm_crc3 = _mm_clmulepi64_si128(xmm_crc3, crc_fold, 0x10); | |
| 487 xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc2); | |
| 488 xmm_crc3 = _mm_xor_si128(xmm_crc3, xmm_crc1); | |
| 489 | |
| 490 crc = _mm_extract_epi32(xmm_crc3, 2); | |
| 491 return ~crc; | |
| 492 CRC_SAVE(s) | |
| 493 } | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 665203006:
Revert of Reland "Integrate SIMD optimisations for zlib" (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master