jidctfst-mmi.c (15614B)
1 /* 2 * Loongson MMI optimizations for libjpeg-turbo 3 * 4 * Copyright (C) 2014-2015, 2018-2019, D. R. Commander. All Rights Reserved. 5 * Copyright (C) 2016-2018, Loongson Technology Corporation Limited, BeiJing. 6 * All Rights Reserved. 7 * Authors: LiuQingfa <liuqingfa-hf@loongson.cn> 8 * 9 * Based on the x86 SIMD extension for IJG JPEG library 10 * Copyright (C) 1999-2006, MIYASAKA Masaru. 11 * 12 * This software is provided 'as-is', without any express or implied 13 * warranty. In no event will the authors be held liable for any damages 14 * arising from the use of this software. 15 * 16 * Permission is granted to anyone to use this software for any purpose, 17 * including commercial applications, and to alter it and redistribute it 18 * freely, subject to the following restrictions: 19 * 20 * 1. The origin of this software must not be misrepresented; you must not 21 * claim that you wrote the original software. If you use this software 22 * in a product, an acknowledgment in the product documentation would be 23 * appreciated but is not required. 24 * 2. Altered source versions must be plainly marked as such, and must not be 25 * misrepresented as being the original software. 26 * 3. This notice may not be removed or altered from any source distribution. 27 */ 28 29 /* FAST INTEGER INVERSE DCT */ 30 31 #include "jsimd_mmi.h" 32 33 34 #define CONST_BITS 8 35 #define PASS1_BITS 2 36 37 #define FIX_1_082 ((short)277) /* FIX(1.082392200) */ 38 #define FIX_1_414 ((short)362) /* FIX(1.414213562) */ 39 #define FIX_1_847 ((short)473) /* FIX(1.847759065) */ 40 #define FIX_2_613 ((short)669) /* FIX(2.613125930) */ 41 #define FIX_1_613 ((short)(FIX_2_613 - 256 * 3)) /* FIX(2.613125930) - FIX(1) */ 42 43 #define PRE_MULTIPLY_SCALE_BITS 2 44 #define CONST_SHIFT (16 - PRE_MULTIPLY_SCALE_BITS - CONST_BITS) 45 46 enum const_index { 47 index_PW_F1082, 48 index_PW_F1414, 49 index_PW_F1847, 50 index_PW_MF1613, 51 index_PB_CENTERJSAMP 52 }; 53 54 static uint64_t const_value[] = { 55 _uint64_set1_pi16(FIX_1_082 << CONST_SHIFT), 56 _uint64_set1_pi16(FIX_1_414 << CONST_SHIFT), 57 _uint64_set1_pi16(FIX_1_847 << CONST_SHIFT), 58 _uint64_set1_pi16(-FIX_1_613 << CONST_SHIFT), 59 _uint64_set1_pi8(CENTERJSAMPLE) 60 }; 61 62 #define PW_F1414 get_const_value(index_PW_F1414) 63 #define PW_F1847 get_const_value(index_PW_F1847) 64 #define PW_MF1613 get_const_value(index_PW_MF1613) 65 #define PW_F1082 get_const_value(index_PW_F1082) 66 #define PB_CENTERJSAMP get_const_value(index_PB_CENTERJSAMP) 67 68 69 #define test_m32_zero(mm32) (!(*(uint32_t *)&mm32)) 70 #define test_m64_zero(mm64) (!(*(uint64_t *)&mm64)) 71 72 73 #define DO_IDCT_COMMON() { \ 74 tmp7 = _mm_add_pi16(z11, z13); \ 75 \ 76 tmp11 = _mm_sub_pi16(z11, z13); \ 77 tmp11 = _mm_slli_pi16(tmp11, PRE_MULTIPLY_SCALE_BITS); \ 78 tmp11 = _mm_mulhi_pi16(tmp11, PW_F1414); \ 79 \ 80 tmp10 = _mm_slli_pi16(z12, PRE_MULTIPLY_SCALE_BITS); \ 81 tmp12 = _mm_slli_pi16(z10, PRE_MULTIPLY_SCALE_BITS); \ 82 \ 83 /* To avoid overflow... \ 84 * \ 85 * (Original) \ 86 * tmp12 = -2.613125930 * z10 + z5; \ 87 * \ 88 * (This implementation) \ 89 * tmp12 = (-1.613125930 - 1) * z10 + z5; \ 90 * = -1.613125930 * z10 - z10 + z5; \ 91 */ \ 92 \ 93 z5 = _mm_add_pi16(tmp10, tmp12); \ 94 z5 = _mm_mulhi_pi16(z5, PW_F1847); \ 95 \ 96 tmp10 = _mm_mulhi_pi16(tmp10, PW_F1082); \ 97 tmp10 = _mm_sub_pi16(tmp10, z5); \ 98 tmp12 = _mm_mulhi_pi16(tmp12, PW_MF1613); \ 99 tmp12 = _mm_sub_pi16(tmp12, z10); \ 100 tmp12 = _mm_sub_pi16(tmp12, z10); \ 101 tmp12 = _mm_sub_pi16(tmp12, z10); \ 102 tmp12 = _mm_add_pi16(tmp12, z5); \ 103 \ 104 /* Final output stage */ \ 105 \ 106 tmp6 = _mm_sub_pi16(tmp12, tmp7); \ 107 tmp5 = _mm_sub_pi16(tmp11, tmp6); \ 108 tmp4 = _mm_add_pi16(tmp10, tmp5); \ 109 \ 110 out0 = _mm_add_pi16(tmp0, tmp7); \ 111 out7 = _mm_sub_pi16(tmp0, tmp7); \ 112 out1 = _mm_add_pi16(tmp1, tmp6); \ 113 out6 = _mm_sub_pi16(tmp1, tmp6); \ 114 \ 115 out2 = _mm_add_pi16(tmp2, tmp5); \ 116 out5 = _mm_sub_pi16(tmp2, tmp5); \ 117 out4 = _mm_add_pi16(tmp3, tmp4); \ 118 out3 = _mm_sub_pi16(tmp3, tmp4); \ 119 } 120 121 #define DO_IDCT_PASS1(iter) { \ 122 __m64 col0l, col1l, col2l, col3l, col4l, col5l, col6l, col7l; \ 123 __m64 quant0l, quant1l, quant2l, quant3l; \ 124 __m64 quant4l, quant5l, quant6l, quant7l; \ 125 __m64 row01a, row01b, row01c, row01d, row23a, row23b, row23c, row23d; \ 126 __m64 row0l, row0h, row1l, row1h, row2l, row2h, row3l, row3h; \ 127 __m32 col0a, col1a, mm0; \ 128 \ 129 col0a = _mm_load_si32((__m32 *)&inptr[DCTSIZE * 1]); \ 130 col1a = _mm_load_si32((__m32 *)&inptr[DCTSIZE * 2]); \ 131 mm0 = _mm_or_si32(col0a, col1a); \ 132 \ 133 if (test_m32_zero(mm0)) { \ 134 __m64 mm1, mm2; \ 135 \ 136 col0l = _mm_load_si64((__m64 *)&inptr[DCTSIZE * 0]); \ 137 col1l = _mm_load_si64((__m64 *)&inptr[DCTSIZE * 1]); \ 138 col2l = _mm_load_si64((__m64 *)&inptr[DCTSIZE * 2]); \ 139 col3l = _mm_load_si64((__m64 *)&inptr[DCTSIZE * 3]); \ 140 col4l = _mm_load_si64((__m64 *)&inptr[DCTSIZE * 4]); \ 141 col5l = _mm_load_si64((__m64 *)&inptr[DCTSIZE * 5]); \ 142 col6l = _mm_load_si64((__m64 *)&inptr[DCTSIZE * 6]); \ 143 col7l = _mm_load_si64((__m64 *)&inptr[DCTSIZE * 7]); \ 144 \ 145 mm1 = _mm_or_si64(col1l, col3l); \ 146 mm2 = _mm_or_si64(col2l, col4l); \ 147 mm1 = _mm_or_si64(mm1, col5l); \ 148 mm2 = _mm_or_si64(mm2, col6l); \ 149 mm1 = _mm_or_si64(mm1, col7l); \ 150 mm1 = _mm_or_si64(mm1, mm2); \ 151 \ 152 if (test_m64_zero(mm1)) { \ 153 __m64 dcval, dcvall, dcvalh, row0, row1, row2, row3; \ 154 \ 155 /* AC terms all zero */ \ 156 \ 157 quant0l = _mm_load_si64((__m64 *)&quantptr[DCTSIZE * 0]); \ 158 \ 159 dcval = _mm_mullo_pi16(col0l, quant0l); /* dcval=(00 10 20 30) */ \ 160 \ 161 dcvall = _mm_unpacklo_pi16(dcval, dcval); /* dcvall=(00 00 10 10) */ \ 162 dcvalh = _mm_unpackhi_pi16(dcval, dcval); /* dcvalh=(20 20 30 30) */ \ 163 \ 164 row0 = _mm_unpacklo_pi32(dcvall, dcvall); /* row0=(00 00 00 00) */ \ 165 row1 = _mm_unpackhi_pi32(dcvall, dcvall); /* row1=(10 10 10 10) */ \ 166 row2 = _mm_unpacklo_pi32(dcvalh, dcvalh); /* row2=(20 20 20 20) */ \ 167 row3 = _mm_unpackhi_pi32(dcvalh, dcvalh); /* row3=(30 30 30 30) */ \ 168 \ 169 _mm_store_si64((__m64 *)&wsptr[DCTSIZE * 0], row0); \ 170 _mm_store_si64((__m64 *)&wsptr[DCTSIZE * 0 + 4], row0); \ 171 _mm_store_si64((__m64 *)&wsptr[DCTSIZE * 1], row1); \ 172 _mm_store_si64((__m64 *)&wsptr[DCTSIZE * 1 + 4], row1); \ 173 _mm_store_si64((__m64 *)&wsptr[DCTSIZE * 2], row2); \ 174 _mm_store_si64((__m64 *)&wsptr[DCTSIZE * 2 + 4], row2); \ 175 _mm_store_si64((__m64 *)&wsptr[DCTSIZE * 3], row3); \ 176 _mm_store_si64((__m64 *)&wsptr[DCTSIZE * 3 + 4], row3); \ 177 \ 178 goto nextcolumn##iter; \ 179 } \ 180 } \ 181 \ 182 /* Even part */ \ 183 \ 184 col0l = _mm_load_si64((__m64 *)&inptr[DCTSIZE * 0]); /* (00 10 20 30) */ \ 185 col2l = _mm_load_si64((__m64 *)&inptr[DCTSIZE * 2]); /* (02 12 22 32) */ \ 186 col4l = _mm_load_si64((__m64 *)&inptr[DCTSIZE * 4]); /* (04 14 24 34) */ \ 187 col6l = _mm_load_si64((__m64 *)&inptr[DCTSIZE * 6]); /* (06 16 26 36) */ \ 188 \ 189 quant0l = _mm_load_si64((__m64 *)&quantptr[DCTSIZE * 0]); \ 190 quant2l = _mm_load_si64((__m64 *)&quantptr[DCTSIZE * 2]); \ 191 quant4l = _mm_load_si64((__m64 *)&quantptr[DCTSIZE * 4]); \ 192 quant6l = _mm_load_si64((__m64 *)&quantptr[DCTSIZE * 6]); \ 193 \ 194 tmp0 = _mm_mullo_pi16(col0l, quant0l); \ 195 tmp1 = _mm_mullo_pi16(col2l, quant2l); \ 196 tmp2 = _mm_mullo_pi16(col4l, quant4l); \ 197 tmp3 = _mm_mullo_pi16(col6l, quant6l); \ 198 \ 199 tmp10 = _mm_add_pi16(tmp0, tmp2); \ 200 tmp11 = _mm_sub_pi16(tmp0, tmp2); \ 201 tmp13 = _mm_add_pi16(tmp1, tmp3); \ 202 \ 203 tmp12 = _mm_sub_pi16(tmp1, tmp3); \ 204 tmp12 = _mm_slli_pi16(tmp12, PRE_MULTIPLY_SCALE_BITS); \ 205 tmp12 = _mm_mulhi_pi16(tmp12, PW_F1414); \ 206 tmp12 = _mm_sub_pi16(tmp12, tmp13); \ 207 \ 208 tmp0 = _mm_add_pi16(tmp10, tmp13); \ 209 tmp3 = _mm_sub_pi16(tmp10, tmp13); \ 210 tmp1 = _mm_add_pi16(tmp11, tmp12); \ 211 tmp2 = _mm_sub_pi16(tmp11, tmp12); \ 212 \ 213 /* Odd part */ \ 214 \ 215 col1l = _mm_load_si64((__m64 *)&inptr[DCTSIZE * 1]); /* (01 11 21 31) */ \ 216 col3l = _mm_load_si64((__m64 *)&inptr[DCTSIZE * 3]); /* (03 13 23 33) */ \ 217 col5l = _mm_load_si64((__m64 *)&inptr[DCTSIZE * 5]); /* (05 15 25 35) */ \ 218 col7l = _mm_load_si64((__m64 *)&inptr[DCTSIZE * 7]); /* (07 17 27 37) */ \ 219 \ 220 quant1l = _mm_load_si64((__m64 *)&quantptr[DCTSIZE * 1]); \ 221 quant3l = _mm_load_si64((__m64 *)&quantptr[DCTSIZE * 3]); \ 222 quant5l = _mm_load_si64((__m64 *)&quantptr[DCTSIZE * 5]); \ 223 quant7l = _mm_load_si64((__m64 *)&quantptr[DCTSIZE * 7]); \ 224 \ 225 tmp4 = _mm_mullo_pi16(col1l, quant1l); \ 226 tmp5 = _mm_mullo_pi16(col3l, quant3l); \ 227 tmp6 = _mm_mullo_pi16(col5l, quant5l); \ 228 tmp7 = _mm_mullo_pi16(col7l, quant7l); \ 229 \ 230 z13 = _mm_add_pi16(tmp6, tmp5); \ 231 z10 = _mm_sub_pi16(tmp6, tmp5); \ 232 z11 = _mm_add_pi16(tmp4, tmp7); \ 233 z12 = _mm_sub_pi16(tmp4, tmp7); \ 234 \ 235 DO_IDCT_COMMON() \ 236 \ 237 /* out0=(00 10 20 30), out1=(01 11 21 31) */ \ 238 /* out2=(02 12 22 32), out3=(03 13 23 33) */ \ 239 /* out4=(04 14 24 34), out5=(05 15 25 35) */ \ 240 /* out6=(06 16 26 36), out7=(07 17 27 37) */ \ 241 \ 242 /* Transpose coefficients */ \ 243 \ 244 row01a = _mm_unpacklo_pi16(out0, out1); /* row01a=(00 01 10 11) */ \ 245 row23a = _mm_unpackhi_pi16(out0, out1); /* row23a=(20 21 30 31) */ \ 246 row01d = _mm_unpacklo_pi16(out6, out7); /* row01d=(06 07 16 17) */ \ 247 row23d = _mm_unpackhi_pi16(out6, out7); /* row23d=(26 27 36 37) */ \ 248 \ 249 row01b = _mm_unpacklo_pi16(out2, out3); /* row01b=(02 03 12 13) */ \ 250 row23b = _mm_unpackhi_pi16(out2, out3); /* row23b=(22 23 32 33) */ \ 251 row01c = _mm_unpacklo_pi16(out4, out5); /* row01c=(04 05 14 15) */ \ 252 row23c = _mm_unpackhi_pi16(out4, out5); /* row23c=(24 25 34 35) */ \ 253 \ 254 row0l = _mm_unpacklo_pi32(row01a, row01b); /* row0l=(00 01 02 03) */ \ 255 row1l = _mm_unpackhi_pi32(row01a, row01b); /* row1l=(10 11 12 13) */ \ 256 row2l = _mm_unpacklo_pi32(row23a, row23b); /* row2l=(20 21 22 23) */ \ 257 row3l = _mm_unpackhi_pi32(row23a, row23b); /* row3l=(30 31 32 33) */ \ 258 \ 259 row0h = _mm_unpacklo_pi32(row01c, row01d); /* row0h=(04 05 06 07) */ \ 260 row1h = _mm_unpackhi_pi32(row01c, row01d); /* row1h=(14 15 16 17) */ \ 261 row2h = _mm_unpacklo_pi32(row23c, row23d); /* row2h=(24 25 26 27) */ \ 262 row3h = _mm_unpackhi_pi32(row23c, row23d); /* row3h=(34 35 36 37) */ \ 263 \ 264 _mm_store_si64((__m64 *)&wsptr[DCTSIZE * 0], row0l); \ 265 _mm_store_si64((__m64 *)&wsptr[DCTSIZE * 0 + 4], row0h); \ 266 _mm_store_si64((__m64 *)&wsptr[DCTSIZE * 1], row1l); \ 267 _mm_store_si64((__m64 *)&wsptr[DCTSIZE * 1 + 4], row1h); \ 268 _mm_store_si64((__m64 *)&wsptr[DCTSIZE * 2], row2l); \ 269 _mm_store_si64((__m64 *)&wsptr[DCTSIZE * 2 + 4], row2h); \ 270 _mm_store_si64((__m64 *)&wsptr[DCTSIZE * 3], row3l); \ 271 _mm_store_si64((__m64 *)&wsptr[DCTSIZE * 3 + 4], row3h); \ 272 } 273 274 #define DO_IDCT_PASS2(ctr) { \ 275 __m64 row0l, row1l, row2l, row3l, row4l, row5l, row6l, row7l; \ 276 __m64 col0123a, col0123b, col0123c, col0123d; \ 277 __m64 col01l, col01h, col23l, col23h; \ 278 __m64 col0, col1, col2, col3; \ 279 __m64 row06, row17, row24, row35; \ 280 \ 281 row0l = _mm_load_si64((__m64 *)&wsptr[DCTSIZE * 0]); /* (00 01 02 03) */ \ 282 row1l = _mm_load_si64((__m64 *)&wsptr[DCTSIZE * 1]); /* (10 11 12 13) */ \ 283 row2l = _mm_load_si64((__m64 *)&wsptr[DCTSIZE * 2]); /* (20 21 22 23) */ \ 284 row3l = _mm_load_si64((__m64 *)&wsptr[DCTSIZE * 3]); /* (30 31 32 33) */ \ 285 row4l = _mm_load_si64((__m64 *)&wsptr[DCTSIZE * 4]); /* (40 41 42 43) */ \ 286 row5l = _mm_load_si64((__m64 *)&wsptr[DCTSIZE * 5]); /* (50 51 52 53) */ \ 287 row6l = _mm_load_si64((__m64 *)&wsptr[DCTSIZE * 6]); /* (60 61 62 63) */ \ 288 row7l = _mm_load_si64((__m64 *)&wsptr[DCTSIZE * 7]); /* (70 71 72 73) */ \ 289 \ 290 /* Even part */ \ 291 \ 292 tmp10 = _mm_add_pi16(row0l, row4l); \ 293 tmp11 = _mm_sub_pi16(row0l, row4l); \ 294 tmp13 = _mm_add_pi16(row2l, row6l); \ 295 \ 296 tmp12 = _mm_sub_pi16(row2l, row6l); \ 297 tmp12 = _mm_slli_pi16(tmp12, PRE_MULTIPLY_SCALE_BITS); \ 298 tmp12 = _mm_mulhi_pi16(tmp12, PW_F1414); \ 299 tmp12 = _mm_sub_pi16(tmp12, tmp13); \ 300 \ 301 tmp0 = _mm_add_pi16(tmp10, tmp13); \ 302 tmp3 = _mm_sub_pi16(tmp10, tmp13); \ 303 tmp1 = _mm_add_pi16(tmp11, tmp12); \ 304 tmp2 = _mm_sub_pi16(tmp11, tmp12); \ 305 \ 306 /* Odd part */ \ 307 \ 308 z13 = _mm_add_pi16(row5l, row3l); \ 309 z10 = _mm_sub_pi16(row5l, row3l); \ 310 z11 = _mm_add_pi16(row1l, row7l); \ 311 z12 = _mm_sub_pi16(row1l, row7l); \ 312 \ 313 DO_IDCT_COMMON() \ 314 \ 315 /* out0=(00 01 02 03), out1=(10 11 12 13) */ \ 316 /* out2=(20 21 22 23), out3=(30 31 32 33) */ \ 317 /* out4=(40 41 42 43), out5=(50 51 52 53) */ \ 318 /* out6=(60 61 62 63), out7=(70 71 72 73) */ \ 319 \ 320 out0 = _mm_srai_pi16(out0, PASS1_BITS + 3); \ 321 out1 = _mm_srai_pi16(out1, PASS1_BITS + 3); \ 322 out2 = _mm_srai_pi16(out2, PASS1_BITS + 3); \ 323 out3 = _mm_srai_pi16(out3, PASS1_BITS + 3); \ 324 out4 = _mm_srai_pi16(out4, PASS1_BITS + 3); \ 325 out5 = _mm_srai_pi16(out5, PASS1_BITS + 3); \ 326 out6 = _mm_srai_pi16(out6, PASS1_BITS + 3); \ 327 out7 = _mm_srai_pi16(out7, PASS1_BITS + 3); \ 328 \ 329 row06 = _mm_packs_pi16(out0, out6); /* row06=(00 01 02 03 60 61 62 63) */ \ 330 row17 = _mm_packs_pi16(out1, out7); /* row17=(10 11 12 13 70 71 72 73) */ \ 331 row24 = _mm_packs_pi16(out2, out4); /* row24=(20 21 22 23 40 41 42 43) */ \ 332 row35 = _mm_packs_pi16(out3, out5); /* row35=(30 31 32 33 50 51 52 53) */ \ 333 \ 334 row06 = _mm_add_pi8(row06, PB_CENTERJSAMP); \ 335 row17 = _mm_add_pi8(row17, PB_CENTERJSAMP); \ 336 row24 = _mm_add_pi8(row24, PB_CENTERJSAMP); \ 337 row35 = _mm_add_pi8(row35, PB_CENTERJSAMP); \ 338 \ 339 /* Transpose coefficients */ \ 340 \ 341 col0123a = _mm_unpacklo_pi8(row06, row17); /* col0123a=(00 10 01 11 02 12 03 13) */ \ 342 col0123d = _mm_unpackhi_pi8(row06, row17); /* col0123d=(60 70 61 71 62 72 63 73) */ \ 343 col0123b = _mm_unpacklo_pi8(row24, row35); /* col0123b=(20 30 21 31 22 32 23 33) */ \ 344 col0123c = _mm_unpackhi_pi8(row24, row35); /* col0123c=(40 50 41 51 42 52 43 53) */ \ 345 \ 346 col01l = _mm_unpacklo_pi16(col0123a, col0123b); /* col01l=(00 10 20 30 01 11 21 31) */ \ 347 col23l = _mm_unpackhi_pi16(col0123a, col0123b); /* col23l=(02 12 22 32 03 13 23 33) */ \ 348 col01h = _mm_unpacklo_pi16(col0123c, col0123d); /* col01h=(40 50 60 70 41 51 61 71) */ \ 349 col23h = _mm_unpackhi_pi16(col0123c, col0123d); /* col23h=(42 52 62 72 43 53 63 73) */ \ 350 \ 351 col0 = _mm_unpacklo_pi32(col01l, col01h); /* col0=(00 10 20 30 40 50 60 70) */ \ 352 col1 = _mm_unpackhi_pi32(col01l, col01h); /* col1=(01 11 21 31 41 51 61 71) */ \ 353 col2 = _mm_unpacklo_pi32(col23l, col23h); /* col2=(02 12 22 32 42 52 62 72) */ \ 354 col3 = _mm_unpackhi_pi32(col23l, col23h); /* col3=(03 13 23 33 43 53 63 73) */ \ 355 \ 356 _mm_store_si64((__m64 *)(output_buf[ctr + 0] + output_col), col0); \ 357 _mm_store_si64((__m64 *)(output_buf[ctr + 1] + output_col), col1); \ 358 _mm_store_si64((__m64 *)(output_buf[ctr + 2] + output_col), col2); \ 359 _mm_store_si64((__m64 *)(output_buf[ctr + 3] + output_col), col3); \ 360 } 361 362 void jsimd_idct_ifast_mmi(void *dct_table, JCOEFPTR coef_block, 363 JSAMPARRAY output_buf, JDIMENSION output_col) 364 { 365 __m64 tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7; 366 __m64 tmp10, tmp11, tmp12, tmp13; 367 __m64 out0, out1, out2, out3, out4, out5, out6, out7; 368 __m64 z5, z10, z11, z12, z13; 369 JCOEFPTR inptr; 370 ISLOW_MULT_TYPE *quantptr; 371 JCOEF *wsptr; 372 JCOEF workspace[DCTSIZE2]; /* buffers data between passes */ 373 374 /* Pass 1: process columns. */ 375 376 inptr = coef_block; 377 quantptr = (ISLOW_MULT_TYPE *)dct_table; 378 wsptr = workspace; 379 380 DO_IDCT_PASS1(1) 381 nextcolumn1: 382 inptr += 4; 383 quantptr += 4; 384 wsptr += DCTSIZE * 4; 385 DO_IDCT_PASS1(2) 386 nextcolumn2: 387 388 /* Pass 2: process rows. */ 389 390 wsptr = workspace; 391 392 DO_IDCT_PASS2(0) 393 wsptr += 4; 394 DO_IDCT_PASS2(4) 395 }