1// Copyright 2015 Google Inc. All Rights Reserved. 2// 3// Use of this source code is governed by a BSD-style license 4// that can be found in the COPYING file in the root of the source 5// tree. An additional intellectual property rights grant can be found 6// in the file PATENTS. All contributing project authors may 7// be found in the AUTHORS file in the root of the source tree. 8// ----------------------------------------------------------------------------- 9// 10// SSE2 Rescaling functions 11// 12// Author: Skal (pascal.massimino@gmail.com) 13 14#include "./dsp.h" 15 16#if defined(WEBP_USE_SSE2) 17#include <emmintrin.h> 18 19#include <assert.h> 20#include "../utils/rescaler_utils.h" 21#include "../utils/utils.h" 22 23//------------------------------------------------------------------------------ 24// Implementations of critical functions ImportRow / ExportRow 25 26#define ROUNDER (WEBP_RESCALER_ONE >> 1) 27#define MULT_FIX(x, y) (((uint64_t)(x) * (y) + ROUNDER) >> WEBP_RESCALER_RFIX) 28 29// input: 8 bytes ABCDEFGH -> output: A0E0B0F0C0G0D0H0 30static void LoadTwoPixels(const uint8_t* const src, __m128i* out) { 31 const __m128i zero = _mm_setzero_si128(); 32 const __m128i A = _mm_loadl_epi64((const __m128i*)(src)); // ABCDEFGH 33 const __m128i B = _mm_unpacklo_epi8(A, zero); // A0B0C0D0E0F0G0H0 34 const __m128i C = _mm_srli_si128(B, 8); // E0F0G0H0 35 *out = _mm_unpacklo_epi16(B, C); 36} 37 38// input: 8 bytes ABCDEFGH -> output: A0B0C0D0E0F0G0H0 39static void LoadHeightPixels(const uint8_t* const src, __m128i* out) { 40 const __m128i zero = _mm_setzero_si128(); 41 const __m128i A = _mm_loadl_epi64((const __m128i*)(src)); // ABCDEFGH 42 *out = _mm_unpacklo_epi8(A, zero); 43} 44 45static void RescalerImportRowExpandSSE2(WebPRescaler* const wrk, 46 const uint8_t* src) { 47 rescaler_t* frow = wrk->frow; 48 const rescaler_t* const frow_end = frow + wrk->dst_width * wrk->num_channels; 49 const int x_add = wrk->x_add; 50 int accum = x_add; 51 __m128i cur_pixels; 52 53 assert(!WebPRescalerInputDone(wrk)); 54 assert(wrk->x_expand); 55 if (wrk->num_channels == 4) { 56 if (wrk->src_width < 2) { 57 WebPRescalerImportRowExpandC(wrk, src); 58 return; 59 } 60 LoadTwoPixels(src, &cur_pixels); 61 src += 4; 62 while (1) { 63 const __m128i mult = _mm_set1_epi32(((x_add - accum) << 16) | accum); 64 const __m128i out = _mm_madd_epi16(cur_pixels, mult); 65 _mm_storeu_si128((__m128i*)frow, out); 66 frow += 4; 67 if (frow >= frow_end) break; 68 accum -= wrk->x_sub; 69 if (accum < 0) { 70 LoadTwoPixels(src, &cur_pixels); 71 src += 4; 72 accum += x_add; 73 } 74 } 75 } else { 76 int left; 77 const uint8_t* const src_limit = src + wrk->src_width - 8; 78 if (wrk->src_width < 8) { 79 WebPRescalerImportRowExpandC(wrk, src); 80 return; 81 } 82 LoadHeightPixels(src, &cur_pixels); 83 src += 7; 84 left = 7; 85 while (1) { 86 const __m128i mult = _mm_cvtsi32_si128(((x_add - accum) << 16) | accum); 87 const __m128i out = _mm_madd_epi16(cur_pixels, mult); 88 assert(sizeof(*frow) == sizeof(uint32_t)); 89 WebPUint32ToMem((uint8_t*)frow, _mm_cvtsi128_si32(out)); 90 frow += 1; 91 if (frow >= frow_end) break; 92 accum -= wrk->x_sub; 93 if (accum < 0) { 94 if (--left) { 95 cur_pixels = _mm_srli_si128(cur_pixels, 2); 96 } else if (src <= src_limit) { 97 LoadHeightPixels(src, &cur_pixels); 98 src += 7; 99 left = 7; 100 } else { // tail 101 cur_pixels = _mm_srli_si128(cur_pixels, 2); 102 cur_pixels = _mm_insert_epi16(cur_pixels, src[1], 1); 103 src += 1; 104 left = 1; 105 } 106 accum += x_add; 107 } 108 } 109 } 110 assert(accum == 0); 111} 112 113static void RescalerImportRowShrinkSSE2(WebPRescaler* const wrk, 114 const uint8_t* src) { 115 const int x_sub = wrk->x_sub; 116 int accum = 0; 117 const __m128i zero = _mm_setzero_si128(); 118 const __m128i mult0 = _mm_set1_epi16(x_sub); 119 const __m128i mult1 = _mm_set1_epi32(wrk->fx_scale); 120 const __m128i rounder = _mm_set_epi32(0, ROUNDER, 0, ROUNDER); 121 __m128i sum = zero; 122 rescaler_t* frow = wrk->frow; 123 const rescaler_t* const frow_end = wrk->frow + 4 * wrk->dst_width; 124 125 if (wrk->num_channels != 4 || wrk->x_add > (x_sub << 7)) { 126 WebPRescalerImportRowShrinkC(wrk, src); 127 return; 128 } 129 assert(!WebPRescalerInputDone(wrk)); 130 assert(!wrk->x_expand); 131 132 for (; frow < frow_end; frow += 4) { 133 __m128i base = zero; 134 accum += wrk->x_add; 135 while (accum > 0) { 136 const __m128i A = _mm_cvtsi32_si128(WebPMemToUint32(src)); 137 src += 4; 138 base = _mm_unpacklo_epi8(A, zero); 139 // To avoid overflow, we need: base * x_add / x_sub < 32768 140 // => x_add < x_sub << 7. That's a 1/128 reduction ratio limit. 141 sum = _mm_add_epi16(sum, base); 142 accum -= x_sub; 143 } 144 { // Emit next horizontal pixel. 145 const __m128i mult = _mm_set1_epi16(-accum); 146 const __m128i frac0 = _mm_mullo_epi16(base, mult); // 16b x 16b -> 32b 147 const __m128i frac1 = _mm_mulhi_epu16(base, mult); 148 const __m128i frac = _mm_unpacklo_epi16(frac0, frac1); // frac is 32b 149 const __m128i A0 = _mm_mullo_epi16(sum, mult0); 150 const __m128i A1 = _mm_mulhi_epu16(sum, mult0); 151 const __m128i B0 = _mm_unpacklo_epi16(A0, A1); // sum * x_sub 152 const __m128i frow_out = _mm_sub_epi32(B0, frac); // sum * x_sub - frac 153 const __m128i D0 = _mm_srli_epi64(frac, 32); 154 const __m128i D1 = _mm_mul_epu32(frac, mult1); // 32b x 16b -> 64b 155 const __m128i D2 = _mm_mul_epu32(D0, mult1); 156 const __m128i E1 = _mm_add_epi64(D1, rounder); 157 const __m128i E2 = _mm_add_epi64(D2, rounder); 158 const __m128i F1 = _mm_shuffle_epi32(E1, 1 | (3 << 2)); 159 const __m128i F2 = _mm_shuffle_epi32(E2, 1 | (3 << 2)); 160 const __m128i G = _mm_unpacklo_epi32(F1, F2); 161 sum = _mm_packs_epi32(G, zero); 162 _mm_storeu_si128((__m128i*)frow, frow_out); 163 } 164 } 165 assert(accum == 0); 166} 167 168//------------------------------------------------------------------------------ 169// Row export 170 171// load *src as epi64, multiply by mult and store result in [out0 ... out3] 172static WEBP_INLINE void LoadDispatchAndMult(const rescaler_t* const src, 173 const __m128i* const mult, 174 __m128i* const out0, 175 __m128i* const out1, 176 __m128i* const out2, 177 __m128i* const out3) { 178 const __m128i A0 = _mm_loadu_si128((const __m128i*)(src + 0)); 179 const __m128i A1 = _mm_loadu_si128((const __m128i*)(src + 4)); 180 const __m128i A2 = _mm_srli_epi64(A0, 32); 181 const __m128i A3 = _mm_srli_epi64(A1, 32); 182 if (mult != NULL) { 183 *out0 = _mm_mul_epu32(A0, *mult); 184 *out1 = _mm_mul_epu32(A1, *mult); 185 *out2 = _mm_mul_epu32(A2, *mult); 186 *out3 = _mm_mul_epu32(A3, *mult); 187 } else { 188 *out0 = A0; 189 *out1 = A1; 190 *out2 = A2; 191 *out3 = A3; 192 } 193} 194 195static WEBP_INLINE void ProcessRow(const __m128i* const A0, 196 const __m128i* const A1, 197 const __m128i* const A2, 198 const __m128i* const A3, 199 const __m128i* const mult, 200 uint8_t* const dst) { 201 const __m128i rounder = _mm_set_epi32(0, ROUNDER, 0, ROUNDER); 202 const __m128i mask = _mm_set_epi32(0xffffffffu, 0, 0xffffffffu, 0); 203 const __m128i B0 = _mm_mul_epu32(*A0, *mult); 204 const __m128i B1 = _mm_mul_epu32(*A1, *mult); 205 const __m128i B2 = _mm_mul_epu32(*A2, *mult); 206 const __m128i B3 = _mm_mul_epu32(*A3, *mult); 207 const __m128i C0 = _mm_add_epi64(B0, rounder); 208 const __m128i C1 = _mm_add_epi64(B1, rounder); 209 const __m128i C2 = _mm_add_epi64(B2, rounder); 210 const __m128i C3 = _mm_add_epi64(B3, rounder); 211 const __m128i D0 = _mm_srli_epi64(C0, WEBP_RESCALER_RFIX); 212 const __m128i D1 = _mm_srli_epi64(C1, WEBP_RESCALER_RFIX); 213#if (WEBP_RESCALER_FIX < 32) 214 const __m128i D2 = 215 _mm_and_si128(_mm_slli_epi64(C2, 32 - WEBP_RESCALER_RFIX), mask); 216 const __m128i D3 = 217 _mm_and_si128(_mm_slli_epi64(C3, 32 - WEBP_RESCALER_RFIX), mask); 218#else 219 const __m128i D2 = _mm_and_si128(C2, mask); 220 const __m128i D3 = _mm_and_si128(C3, mask); 221#endif 222 const __m128i E0 = _mm_or_si128(D0, D2); 223 const __m128i E1 = _mm_or_si128(D1, D3); 224 const __m128i F = _mm_packs_epi32(E0, E1); 225 const __m128i G = _mm_packus_epi16(F, F); 226 _mm_storel_epi64((__m128i*)dst, G); 227} 228 229static void RescalerExportRowExpandSSE2(WebPRescaler* const wrk) { 230 int x_out; 231 uint8_t* const dst = wrk->dst; 232 rescaler_t* const irow = wrk->irow; 233 const int x_out_max = wrk->dst_width * wrk->num_channels; 234 const rescaler_t* const frow = wrk->frow; 235 const __m128i mult = _mm_set_epi32(0, wrk->fy_scale, 0, wrk->fy_scale); 236 237 assert(!WebPRescalerOutputDone(wrk)); 238 assert(wrk->y_accum <= 0 && wrk->y_sub + wrk->y_accum >= 0); 239 assert(wrk->y_expand); 240 if (wrk->y_accum == 0) { 241 for (x_out = 0; x_out + 8 <= x_out_max; x_out += 8) { 242 __m128i A0, A1, A2, A3; 243 LoadDispatchAndMult(frow + x_out, NULL, &A0, &A1, &A2, &A3); 244 ProcessRow(&A0, &A1, &A2, &A3, &mult, dst + x_out); 245 } 246 for (; x_out < x_out_max; ++x_out) { 247 const uint32_t J = frow[x_out]; 248 const int v = (int)MULT_FIX(J, wrk->fy_scale); 249 assert(v >= 0 && v <= 255); 250 dst[x_out] = v; 251 } 252 } else { 253 const uint32_t B = WEBP_RESCALER_FRAC(-wrk->y_accum, wrk->y_sub); 254 const uint32_t A = (uint32_t)(WEBP_RESCALER_ONE - B); 255 const __m128i mA = _mm_set_epi32(0, A, 0, A); 256 const __m128i mB = _mm_set_epi32(0, B, 0, B); 257 const __m128i rounder = _mm_set_epi32(0, ROUNDER, 0, ROUNDER); 258 for (x_out = 0; x_out + 8 <= x_out_max; x_out += 8) { 259 __m128i A0, A1, A2, A3, B0, B1, B2, B3; 260 LoadDispatchAndMult(frow + x_out, &mA, &A0, &A1, &A2, &A3); 261 LoadDispatchAndMult(irow + x_out, &mB, &B0, &B1, &B2, &B3); 262 { 263 const __m128i C0 = _mm_add_epi64(A0, B0); 264 const __m128i C1 = _mm_add_epi64(A1, B1); 265 const __m128i C2 = _mm_add_epi64(A2, B2); 266 const __m128i C3 = _mm_add_epi64(A3, B3); 267 const __m128i D0 = _mm_add_epi64(C0, rounder); 268 const __m128i D1 = _mm_add_epi64(C1, rounder); 269 const __m128i D2 = _mm_add_epi64(C2, rounder); 270 const __m128i D3 = _mm_add_epi64(C3, rounder); 271 const __m128i E0 = _mm_srli_epi64(D0, WEBP_RESCALER_RFIX); 272 const __m128i E1 = _mm_srli_epi64(D1, WEBP_RESCALER_RFIX); 273 const __m128i E2 = _mm_srli_epi64(D2, WEBP_RESCALER_RFIX); 274 const __m128i E3 = _mm_srli_epi64(D3, WEBP_RESCALER_RFIX); 275 ProcessRow(&E0, &E1, &E2, &E3, &mult, dst + x_out); 276 } 277 } 278 for (; x_out < x_out_max; ++x_out) { 279 const uint64_t I = (uint64_t)A * frow[x_out] 280 + (uint64_t)B * irow[x_out]; 281 const uint32_t J = (uint32_t)((I + ROUNDER) >> WEBP_RESCALER_RFIX); 282 const int v = (int)MULT_FIX(J, wrk->fy_scale); 283 assert(v >= 0 && v <= 255); 284 dst[x_out] = v; 285 } 286 } 287} 288 289static void RescalerExportRowShrinkSSE2(WebPRescaler* const wrk) { 290 int x_out; 291 uint8_t* const dst = wrk->dst; 292 rescaler_t* const irow = wrk->irow; 293 const int x_out_max = wrk->dst_width * wrk->num_channels; 294 const rescaler_t* const frow = wrk->frow; 295 const uint32_t yscale = wrk->fy_scale * (-wrk->y_accum); 296 assert(!WebPRescalerOutputDone(wrk)); 297 assert(wrk->y_accum <= 0); 298 assert(!wrk->y_expand); 299 if (yscale) { 300 const int scale_xy = wrk->fxy_scale; 301 const __m128i mult_xy = _mm_set_epi32(0, scale_xy, 0, scale_xy); 302 const __m128i mult_y = _mm_set_epi32(0, yscale, 0, yscale); 303 const __m128i rounder = _mm_set_epi32(0, ROUNDER, 0, ROUNDER); 304 for (x_out = 0; x_out + 8 <= x_out_max; x_out += 8) { 305 __m128i A0, A1, A2, A3, B0, B1, B2, B3; 306 LoadDispatchAndMult(irow + x_out, NULL, &A0, &A1, &A2, &A3); 307 LoadDispatchAndMult(frow + x_out, &mult_y, &B0, &B1, &B2, &B3); 308 { 309 const __m128i C0 = _mm_add_epi64(B0, rounder); 310 const __m128i C1 = _mm_add_epi64(B1, rounder); 311 const __m128i C2 = _mm_add_epi64(B2, rounder); 312 const __m128i C3 = _mm_add_epi64(B3, rounder); 313 const __m128i D0 = _mm_srli_epi64(C0, WEBP_RESCALER_RFIX); // = frac 314 const __m128i D1 = _mm_srli_epi64(C1, WEBP_RESCALER_RFIX); 315 const __m128i D2 = _mm_srli_epi64(C2, WEBP_RESCALER_RFIX); 316 const __m128i D3 = _mm_srli_epi64(C3, WEBP_RESCALER_RFIX); 317 const __m128i E0 = _mm_sub_epi64(A0, D0); // irow[x] - frac 318 const __m128i E1 = _mm_sub_epi64(A1, D1); 319 const __m128i E2 = _mm_sub_epi64(A2, D2); 320 const __m128i E3 = _mm_sub_epi64(A3, D3); 321 const __m128i F2 = _mm_slli_epi64(D2, 32); 322 const __m128i F3 = _mm_slli_epi64(D3, 32); 323 const __m128i G0 = _mm_or_si128(D0, F2); 324 const __m128i G1 = _mm_or_si128(D1, F3); 325 _mm_storeu_si128((__m128i*)(irow + x_out + 0), G0); 326 _mm_storeu_si128((__m128i*)(irow + x_out + 4), G1); 327 ProcessRow(&E0, &E1, &E2, &E3, &mult_xy, dst + x_out); 328 } 329 } 330 for (; x_out < x_out_max; ++x_out) { 331 const uint32_t frac = (int)MULT_FIX(frow[x_out], yscale); 332 const int v = (int)MULT_FIX(irow[x_out] - frac, wrk->fxy_scale); 333 assert(v >= 0 && v <= 255); 334 dst[x_out] = v; 335 irow[x_out] = frac; // new fractional start 336 } 337 } else { 338 const uint32_t scale = wrk->fxy_scale; 339 const __m128i mult = _mm_set_epi32(0, scale, 0, scale); 340 const __m128i zero = _mm_setzero_si128(); 341 for (x_out = 0; x_out + 8 <= x_out_max; x_out += 8) { 342 __m128i A0, A1, A2, A3; 343 LoadDispatchAndMult(irow + x_out, NULL, &A0, &A1, &A2, &A3); 344 _mm_storeu_si128((__m128i*)(irow + x_out + 0), zero); 345 _mm_storeu_si128((__m128i*)(irow + x_out + 4), zero); 346 ProcessRow(&A0, &A1, &A2, &A3, &mult, dst + x_out); 347 } 348 for (; x_out < x_out_max; ++x_out) { 349 const int v = (int)MULT_FIX(irow[x_out], scale); 350 assert(v >= 0 && v <= 255); 351 dst[x_out] = v; 352 irow[x_out] = 0; 353 } 354 } 355} 356 357#undef MULT_FIX 358#undef ROUNDER 359 360//------------------------------------------------------------------------------ 361 362extern void WebPRescalerDspInitSSE2(void); 363 364WEBP_TSAN_IGNORE_FUNCTION void WebPRescalerDspInitSSE2(void) { 365 WebPRescalerImportRowExpand = RescalerImportRowExpandSSE2; 366 WebPRescalerImportRowShrink = RescalerImportRowShrinkSSE2; 367 WebPRescalerExportRowExpand = RescalerExportRowExpandSSE2; 368 WebPRescalerExportRowShrink = RescalerExportRowShrinkSSE2; 369} 370 371#else // !WEBP_USE_SSE2 372 373WEBP_DSP_INIT_STUB(WebPRescalerDspInitSSE2) 374 375#endif // WEBP_USE_SSE2 376