1 ; 2 ; jidctfst.asm - fast integer IDCT (MMX) 3 ; 4 ; Copyright 2009 Pierre Ossman <ossman (a] cendio.se> for Cendio AB 5 ; 6 ; Based on the x86 SIMD extension for IJG JPEG library 7 ; Copyright (C) 1999-2006, MIYASAKA Masaru. 8 ; For conditions of distribution and use, see copyright notice in jsimdext.inc 9 ; 10 ; This file should be assembled with NASM (Netwide Assembler), 11 ; can *not* be assembled with Microsoft's MASM or any compatible 12 ; assembler (including Borland's Turbo Assembler). 13 ; NASM is available from http://nasm.sourceforge.net/ or 14 ; http://sourceforge.net/project/showfiles.php?group_id=6208 15 ; 16 ; This file contains a fast, not so accurate integer implementation of 17 ; the inverse DCT (Discrete Cosine Transform). The following code is 18 ; based directly on the IJG's original jidctfst.c; see the jidctfst.c 19 ; for more details. 20 ; 21 ; [TAB8] 22 23 %include "jsimdext.inc" 24 %include "jdct.inc" 25 26 ; -------------------------------------------------------------------------- 27 28 %define CONST_BITS 8 ; 14 is also OK. 29 %define PASS1_BITS 2 30 31 %if IFAST_SCALE_BITS != PASS1_BITS 32 %error "'IFAST_SCALE_BITS' must be equal to 'PASS1_BITS'." 33 %endif 34 35 %if CONST_BITS == 8 36 F_1_082 equ 277 ; FIX(1.082392200) 37 F_1_414 equ 362 ; FIX(1.414213562) 38 F_1_847 equ 473 ; FIX(1.847759065) 39 F_2_613 equ 669 ; FIX(2.613125930) 40 F_1_613 equ (F_2_613 - 256) ; FIX(2.613125930) - FIX(1) 41 %else 42 ; NASM cannot do compile-time arithmetic on floating-point constants. 43 %define DESCALE(x,n) (((x)+(1<<((n)-1)))>>(n)) 44 F_1_082 equ DESCALE(1162209775,30-CONST_BITS) ; FIX(1.082392200) 45 F_1_414 equ DESCALE(1518500249,30-CONST_BITS) ; FIX(1.414213562) 46 F_1_847 equ DESCALE(1984016188,30-CONST_BITS) ; FIX(1.847759065) 47 F_2_613 equ DESCALE(2805822602,30-CONST_BITS) ; FIX(2.613125930) 48 F_1_613 equ (F_2_613 - (1 << CONST_BITS)) ; FIX(2.613125930) - FIX(1) 49 %endif 50 51 ; -------------------------------------------------------------------------- 52 SECTION SEG_CONST 53 54 ; PRE_MULTIPLY_SCALE_BITS <= 2 (to avoid overflow) 55 ; CONST_BITS + CONST_SHIFT + PRE_MULTIPLY_SCALE_BITS == 16 (for pmulhw) 56 57 %define PRE_MULTIPLY_SCALE_BITS 2 58 %define CONST_SHIFT (16 - PRE_MULTIPLY_SCALE_BITS - CONST_BITS) 59 60 alignz 16 61 global EXTN(jconst_idct_ifast_mmx) 62 63 EXTN(jconst_idct_ifast_mmx): 64 65 PW_F1414 times 4 dw F_1_414 << CONST_SHIFT 66 PW_F1847 times 4 dw F_1_847 << CONST_SHIFT 67 PW_MF1613 times 4 dw -F_1_613 << CONST_SHIFT 68 PW_F1082 times 4 dw F_1_082 << CONST_SHIFT 69 PB_CENTERJSAMP times 8 db CENTERJSAMPLE 70 71 alignz 16 72 73 ; -------------------------------------------------------------------------- 74 SECTION SEG_TEXT 75 BITS 32 76 ; 77 ; Perform dequantization and inverse DCT on one block of coefficients. 78 ; 79 ; GLOBAL(void) 80 ; jsimd_idct_ifast_mmx (void *dct_table, JCOEFPTR coef_block, 81 ; JSAMPARRAY output_buf, JDIMENSION output_col) 82 ; 83 84 %define dct_table(b) (b)+8 ; jpeg_component_info *compptr 85 %define coef_block(b) (b)+12 ; JCOEFPTR coef_block 86 %define output_buf(b) (b)+16 ; JSAMPARRAY output_buf 87 %define output_col(b) (b)+20 ; JDIMENSION output_col 88 89 %define original_ebp ebp+0 90 %define wk(i) ebp-(WK_NUM-(i))*SIZEOF_MMWORD ; mmword wk[WK_NUM] 91 %define WK_NUM 2 92 %define workspace wk(0)-DCTSIZE2*SIZEOF_JCOEF 93 ; JCOEF workspace[DCTSIZE2] 94 95 align 16 96 global EXTN(jsimd_idct_ifast_mmx) 97 98 EXTN(jsimd_idct_ifast_mmx): 99 push ebp 100 mov eax,esp ; eax = original ebp 101 sub esp, byte 4 102 and esp, byte (-SIZEOF_MMWORD) ; align to 64 bits 103 mov [esp],eax 104 mov ebp,esp ; ebp = aligned ebp 105 lea esp, [workspace] 106 push ebx 107 ; push ecx ; need not be preserved 108 ; push edx ; need not be preserved 109 push esi 110 push edi 111 112 get_GOT ebx ; get GOT address 113 114 ; ---- Pass 1: process columns from input, store into work array. 115 116 ; mov eax, [original_ebp] 117 mov edx, POINTER [dct_table(eax)] ; quantptr 118 mov esi, JCOEFPTR [coef_block(eax)] ; inptr 119 lea edi, [workspace] ; JCOEF *wsptr 120 mov ecx, DCTSIZE/4 ; ctr 121 alignx 16,7 122 .columnloop: 123 %ifndef NO_ZERO_COLUMN_TEST_IFAST_MMX 124 mov eax, DWORD [DWBLOCK(1,0,esi,SIZEOF_JCOEF)] 125 or eax, DWORD [DWBLOCK(2,0,esi,SIZEOF_JCOEF)] 126 jnz short .columnDCT 127 128 movq mm0, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)] 129 movq mm1, MMWORD [MMBLOCK(2,0,esi,SIZEOF_JCOEF)] 130 por mm0, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)] 131 por mm1, MMWORD [MMBLOCK(4,0,esi,SIZEOF_JCOEF)] 132 por mm0, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)] 133 por mm1, MMWORD [MMBLOCK(6,0,esi,SIZEOF_JCOEF)] 134 por mm0, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)] 135 por mm1,mm0 136 packsswb mm1,mm1 137 movd eax,mm1 138 test eax,eax 139 jnz short .columnDCT 140 141 ; -- AC terms all zero 142 143 movq mm0, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)] 144 pmullw mm0, MMWORD [MMBLOCK(0,0,edx,SIZEOF_IFAST_MULT_TYPE)] 145 146 movq mm2,mm0 ; mm0=in0=(00 01 02 03) 147 punpcklwd mm0,mm0 ; mm0=(00 00 01 01) 148 punpckhwd mm2,mm2 ; mm2=(02 02 03 03) 149 150 movq mm1,mm0 151 punpckldq mm0,mm0 ; mm0=(00 00 00 00) 152 punpckhdq mm1,mm1 ; mm1=(01 01 01 01) 153 movq mm3,mm2 154 punpckldq mm2,mm2 ; mm2=(02 02 02 02) 155 punpckhdq mm3,mm3 ; mm3=(03 03 03 03) 156 157 movq MMWORD [MMBLOCK(0,0,edi,SIZEOF_JCOEF)], mm0 158 movq MMWORD [MMBLOCK(0,1,edi,SIZEOF_JCOEF)], mm0 159 movq MMWORD [MMBLOCK(1,0,edi,SIZEOF_JCOEF)], mm1 160 movq MMWORD [MMBLOCK(1,1,edi,SIZEOF_JCOEF)], mm1 161 movq MMWORD [MMBLOCK(2,0,edi,SIZEOF_JCOEF)], mm2 162 movq MMWORD [MMBLOCK(2,1,edi,SIZEOF_JCOEF)], mm2 163 movq MMWORD [MMBLOCK(3,0,edi,SIZEOF_JCOEF)], mm3 164 movq MMWORD [MMBLOCK(3,1,edi,SIZEOF_JCOEF)], mm3 165 jmp near .nextcolumn 166 alignx 16,7 167 %endif 168 .columnDCT: 169 170 ; -- Even part 171 172 movq mm0, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)] 173 movq mm1, MMWORD [MMBLOCK(2,0,esi,SIZEOF_JCOEF)] 174 pmullw mm0, MMWORD [MMBLOCK(0,0,edx,SIZEOF_IFAST_MULT_TYPE)] 175 pmullw mm1, MMWORD [MMBLOCK(2,0,edx,SIZEOF_IFAST_MULT_TYPE)] 176 movq mm2, MMWORD [MMBLOCK(4,0,esi,SIZEOF_JCOEF)] 177 movq mm3, MMWORD [MMBLOCK(6,0,esi,SIZEOF_JCOEF)] 178 pmullw mm2, MMWORD [MMBLOCK(4,0,edx,SIZEOF_IFAST_MULT_TYPE)] 179 pmullw mm3, MMWORD [MMBLOCK(6,0,edx,SIZEOF_IFAST_MULT_TYPE)] 180 181 movq mm4,mm0 182 movq mm5,mm1 183 psubw mm0,mm2 ; mm0=tmp11 184 psubw mm1,mm3 185 paddw mm4,mm2 ; mm4=tmp10 186 paddw mm5,mm3 ; mm5=tmp13 187 188 psllw mm1,PRE_MULTIPLY_SCALE_BITS 189 pmulhw mm1,[GOTOFF(ebx,PW_F1414)] 190 psubw mm1,mm5 ; mm1=tmp12 191 192 movq mm6,mm4 193 movq mm7,mm0 194 psubw mm4,mm5 ; mm4=tmp3 195 psubw mm0,mm1 ; mm0=tmp2 196 paddw mm6,mm5 ; mm6=tmp0 197 paddw mm7,mm1 ; mm7=tmp1 198 199 movq MMWORD [wk(1)], mm4 ; wk(1)=tmp3 200 movq MMWORD [wk(0)], mm0 ; wk(0)=tmp2 201 202 ; -- Odd part 203 204 movq mm2, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)] 205 movq mm3, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)] 206 pmullw mm2, MMWORD [MMBLOCK(1,0,edx,SIZEOF_IFAST_MULT_TYPE)] 207 pmullw mm3, MMWORD [MMBLOCK(3,0,edx,SIZEOF_IFAST_MULT_TYPE)] 208 movq mm5, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)] 209 movq mm1, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)] 210 pmullw mm5, MMWORD [MMBLOCK(5,0,edx,SIZEOF_IFAST_MULT_TYPE)] 211 pmullw mm1, MMWORD [MMBLOCK(7,0,edx,SIZEOF_IFAST_MULT_TYPE)] 212 213 movq mm4,mm2 214 movq mm0,mm5 215 psubw mm2,mm1 ; mm2=z12 216 psubw mm5,mm3 ; mm5=z10 217 paddw mm4,mm1 ; mm4=z11 218 paddw mm0,mm3 ; mm0=z13 219 220 movq mm1,mm5 ; mm1=z10(unscaled) 221 psllw mm2,PRE_MULTIPLY_SCALE_BITS 222 psllw mm5,PRE_MULTIPLY_SCALE_BITS 223 224 movq mm3,mm4 225 psubw mm4,mm0 226 paddw mm3,mm0 ; mm3=tmp7 227 228 psllw mm4,PRE_MULTIPLY_SCALE_BITS 229 pmulhw mm4,[GOTOFF(ebx,PW_F1414)] ; mm4=tmp11 230 231 ; To avoid overflow... 232 ; 233 ; (Original) 234 ; tmp12 = -2.613125930 * z10 + z5; 235 ; 236 ; (This implementation) 237 ; tmp12 = (-1.613125930 - 1) * z10 + z5; 238 ; = -1.613125930 * z10 - z10 + z5; 239 240 movq mm0,mm5 241 paddw mm5,mm2 242 pmulhw mm5,[GOTOFF(ebx,PW_F1847)] ; mm5=z5 243 pmulhw mm0,[GOTOFF(ebx,PW_MF1613)] 244 pmulhw mm2,[GOTOFF(ebx,PW_F1082)] 245 psubw mm0,mm1 246 psubw mm2,mm5 ; mm2=tmp10 247 paddw mm0,mm5 ; mm0=tmp12 248 249 ; -- Final output stage 250 251 psubw mm0,mm3 ; mm0=tmp6 252 movq mm1,mm6 253 movq mm5,mm7 254 paddw mm6,mm3 ; mm6=data0=(00 01 02 03) 255 paddw mm7,mm0 ; mm7=data1=(10 11 12 13) 256 psubw mm1,mm3 ; mm1=data7=(70 71 72 73) 257 psubw mm5,mm0 ; mm5=data6=(60 61 62 63) 258 psubw mm4,mm0 ; mm4=tmp5 259 260 movq mm3,mm6 ; transpose coefficients(phase 1) 261 punpcklwd mm6,mm7 ; mm6=(00 10 01 11) 262 punpckhwd mm3,mm7 ; mm3=(02 12 03 13) 263 movq mm0,mm5 ; transpose coefficients(phase 1) 264 punpcklwd mm5,mm1 ; mm5=(60 70 61 71) 265 punpckhwd mm0,mm1 ; mm0=(62 72 63 73) 266 267 movq mm7, MMWORD [wk(0)] ; mm7=tmp2 268 movq mm1, MMWORD [wk(1)] ; mm1=tmp3 269 270 movq MMWORD [wk(0)], mm5 ; wk(0)=(60 70 61 71) 271 movq MMWORD [wk(1)], mm0 ; wk(1)=(62 72 63 73) 272 273 paddw mm2,mm4 ; mm2=tmp4 274 movq mm5,mm7 275 movq mm0,mm1 276 paddw mm7,mm4 ; mm7=data2=(20 21 22 23) 277 paddw mm1,mm2 ; mm1=data4=(40 41 42 43) 278 psubw mm5,mm4 ; mm5=data5=(50 51 52 53) 279 psubw mm0,mm2 ; mm0=data3=(30 31 32 33) 280 281 movq mm4,mm7 ; transpose coefficients(phase 1) 282 punpcklwd mm7,mm0 ; mm7=(20 30 21 31) 283 punpckhwd mm4,mm0 ; mm4=(22 32 23 33) 284 movq mm2,mm1 ; transpose coefficients(phase 1) 285 punpcklwd mm1,mm5 ; mm1=(40 50 41 51) 286 punpckhwd mm2,mm5 ; mm2=(42 52 43 53) 287 288 movq mm0,mm6 ; transpose coefficients(phase 2) 289 punpckldq mm6,mm7 ; mm6=(00 10 20 30) 290 punpckhdq mm0,mm7 ; mm0=(01 11 21 31) 291 movq mm5,mm3 ; transpose coefficients(phase 2) 292 punpckldq mm3,mm4 ; mm3=(02 12 22 32) 293 punpckhdq mm5,mm4 ; mm5=(03 13 23 33) 294 295 movq mm7, MMWORD [wk(0)] ; mm7=(60 70 61 71) 296 movq mm4, MMWORD [wk(1)] ; mm4=(62 72 63 73) 297 298 movq MMWORD [MMBLOCK(0,0,edi,SIZEOF_JCOEF)], mm6 299 movq MMWORD [MMBLOCK(1,0,edi,SIZEOF_JCOEF)], mm0 300 movq MMWORD [MMBLOCK(2,0,edi,SIZEOF_JCOEF)], mm3 301 movq MMWORD [MMBLOCK(3,0,edi,SIZEOF_JCOEF)], mm5 302 303 movq mm6,mm1 ; transpose coefficients(phase 2) 304 punpckldq mm1,mm7 ; mm1=(40 50 60 70) 305 punpckhdq mm6,mm7 ; mm6=(41 51 61 71) 306 movq mm0,mm2 ; transpose coefficients(phase 2) 307 punpckldq mm2,mm4 ; mm2=(42 52 62 72) 308 punpckhdq mm0,mm4 ; mm0=(43 53 63 73) 309 310 movq MMWORD [MMBLOCK(0,1,edi,SIZEOF_JCOEF)], mm1 311 movq MMWORD [MMBLOCK(1,1,edi,SIZEOF_JCOEF)], mm6 312 movq MMWORD [MMBLOCK(2,1,edi,SIZEOF_JCOEF)], mm2 313 movq MMWORD [MMBLOCK(3,1,edi,SIZEOF_JCOEF)], mm0 314 315 .nextcolumn: 316 add esi, byte 4*SIZEOF_JCOEF ; coef_block 317 add edx, byte 4*SIZEOF_IFAST_MULT_TYPE ; quantptr 318 add edi, byte 4*DCTSIZE*SIZEOF_JCOEF ; wsptr 319 dec ecx ; ctr 320 jnz near .columnloop 321 322 ; ---- Pass 2: process rows from work array, store into output array. 323 324 mov eax, [original_ebp] 325 lea esi, [workspace] ; JCOEF *wsptr 326 mov edi, JSAMPARRAY [output_buf(eax)] ; (JSAMPROW *) 327 mov eax, JDIMENSION [output_col(eax)] 328 mov ecx, DCTSIZE/4 ; ctr 329 alignx 16,7 330 .rowloop: 331 332 ; -- Even part 333 334 movq mm0, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)] 335 movq mm1, MMWORD [MMBLOCK(2,0,esi,SIZEOF_JCOEF)] 336 movq mm2, MMWORD [MMBLOCK(4,0,esi,SIZEOF_JCOEF)] 337 movq mm3, MMWORD [MMBLOCK(6,0,esi,SIZEOF_JCOEF)] 338 339 movq mm4,mm0 340 movq mm5,mm1 341 psubw mm0,mm2 ; mm0=tmp11 342 psubw mm1,mm3 343 paddw mm4,mm2 ; mm4=tmp10 344 paddw mm5,mm3 ; mm5=tmp13 345 346 psllw mm1,PRE_MULTIPLY_SCALE_BITS 347 pmulhw mm1,[GOTOFF(ebx,PW_F1414)] 348 psubw mm1,mm5 ; mm1=tmp12 349 350 movq mm6,mm4 351 movq mm7,mm0 352 psubw mm4,mm5 ; mm4=tmp3 353 psubw mm0,mm1 ; mm0=tmp2 354 paddw mm6,mm5 ; mm6=tmp0 355 paddw mm7,mm1 ; mm7=tmp1 356 357 movq MMWORD [wk(1)], mm4 ; wk(1)=tmp3 358 movq MMWORD [wk(0)], mm0 ; wk(0)=tmp2 359 360 ; -- Odd part 361 362 movq mm2, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)] 363 movq mm3, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)] 364 movq mm5, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)] 365 movq mm1, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)] 366 367 movq mm4,mm2 368 movq mm0,mm5 369 psubw mm2,mm1 ; mm2=z12 370 psubw mm5,mm3 ; mm5=z10 371 paddw mm4,mm1 ; mm4=z11 372 paddw mm0,mm3 ; mm0=z13 373 374 movq mm1,mm5 ; mm1=z10(unscaled) 375 psllw mm2,PRE_MULTIPLY_SCALE_BITS 376 psllw mm5,PRE_MULTIPLY_SCALE_BITS 377 378 movq mm3,mm4 379 psubw mm4,mm0 380 paddw mm3,mm0 ; mm3=tmp7 381 382 psllw mm4,PRE_MULTIPLY_SCALE_BITS 383 pmulhw mm4,[GOTOFF(ebx,PW_F1414)] ; mm4=tmp11 384 385 ; To avoid overflow... 386 ; 387 ; (Original) 388 ; tmp12 = -2.613125930 * z10 + z5; 389 ; 390 ; (This implementation) 391 ; tmp12 = (-1.613125930 - 1) * z10 + z5; 392 ; = -1.613125930 * z10 - z10 + z5; 393 394 movq mm0,mm5 395 paddw mm5,mm2 396 pmulhw mm5,[GOTOFF(ebx,PW_F1847)] ; mm5=z5 397 pmulhw mm0,[GOTOFF(ebx,PW_MF1613)] 398 pmulhw mm2,[GOTOFF(ebx,PW_F1082)] 399 psubw mm0,mm1 400 psubw mm2,mm5 ; mm2=tmp10 401 paddw mm0,mm5 ; mm0=tmp12 402 403 ; -- Final output stage 404 405 psubw mm0,mm3 ; mm0=tmp6 406 movq mm1,mm6 407 movq mm5,mm7 408 paddw mm6,mm3 ; mm6=data0=(00 10 20 30) 409 paddw mm7,mm0 ; mm7=data1=(01 11 21 31) 410 psraw mm6,(PASS1_BITS+3) ; descale 411 psraw mm7,(PASS1_BITS+3) ; descale 412 psubw mm1,mm3 ; mm1=data7=(07 17 27 37) 413 psubw mm5,mm0 ; mm5=data6=(06 16 26 36) 414 psraw mm1,(PASS1_BITS+3) ; descale 415 psraw mm5,(PASS1_BITS+3) ; descale 416 psubw mm4,mm0 ; mm4=tmp5 417 418 packsswb mm6,mm5 ; mm6=(00 10 20 30 06 16 26 36) 419 packsswb mm7,mm1 ; mm7=(01 11 21 31 07 17 27 37) 420 421 movq mm3, MMWORD [wk(0)] ; mm3=tmp2 422 movq mm0, MMWORD [wk(1)] ; mm0=tmp3 423 424 paddw mm2,mm4 ; mm2=tmp4 425 movq mm5,mm3 426 movq mm1,mm0 427 paddw mm3,mm4 ; mm3=data2=(02 12 22 32) 428 paddw mm0,mm2 ; mm0=data4=(04 14 24 34) 429 psraw mm3,(PASS1_BITS+3) ; descale 430 psraw mm0,(PASS1_BITS+3) ; descale 431 psubw mm5,mm4 ; mm5=data5=(05 15 25 35) 432 psubw mm1,mm2 ; mm1=data3=(03 13 23 33) 433 psraw mm5,(PASS1_BITS+3) ; descale 434 psraw mm1,(PASS1_BITS+3) ; descale 435 436 movq mm4,[GOTOFF(ebx,PB_CENTERJSAMP)] ; mm4=[PB_CENTERJSAMP] 437 438 packsswb mm3,mm0 ; mm3=(02 12 22 32 04 14 24 34) 439 packsswb mm1,mm5 ; mm1=(03 13 23 33 05 15 25 35) 440 441 paddb mm6,mm4 442 paddb mm7,mm4 443 paddb mm3,mm4 444 paddb mm1,mm4 445 446 movq mm2,mm6 ; transpose coefficients(phase 1) 447 punpcklbw mm6,mm7 ; mm6=(00 01 10 11 20 21 30 31) 448 punpckhbw mm2,mm7 ; mm2=(06 07 16 17 26 27 36 37) 449 movq mm0,mm3 ; transpose coefficients(phase 1) 450 punpcklbw mm3,mm1 ; mm3=(02 03 12 13 22 23 32 33) 451 punpckhbw mm0,mm1 ; mm0=(04 05 14 15 24 25 34 35) 452 453 movq mm5,mm6 ; transpose coefficients(phase 2) 454 punpcklwd mm6,mm3 ; mm6=(00 01 02 03 10 11 12 13) 455 punpckhwd mm5,mm3 ; mm5=(20 21 22 23 30 31 32 33) 456 movq mm4,mm0 ; transpose coefficients(phase 2) 457 punpcklwd mm0,mm2 ; mm0=(04 05 06 07 14 15 16 17) 458 punpckhwd mm4,mm2 ; mm4=(24 25 26 27 34 35 36 37) 459 460 movq mm7,mm6 ; transpose coefficients(phase 3) 461 punpckldq mm6,mm0 ; mm6=(00 01 02 03 04 05 06 07) 462 punpckhdq mm7,mm0 ; mm7=(10 11 12 13 14 15 16 17) 463 movq mm1,mm5 ; transpose coefficients(phase 3) 464 punpckldq mm5,mm4 ; mm5=(20 21 22 23 24 25 26 27) 465 punpckhdq mm1,mm4 ; mm1=(30 31 32 33 34 35 36 37) 466 467 pushpic ebx ; save GOT address 468 469 mov edx, JSAMPROW [edi+0*SIZEOF_JSAMPROW] 470 mov ebx, JSAMPROW [edi+1*SIZEOF_JSAMPROW] 471 movq MMWORD [edx+eax*SIZEOF_JSAMPLE], mm6 472 movq MMWORD [ebx+eax*SIZEOF_JSAMPLE], mm7 473 mov edx, JSAMPROW [edi+2*SIZEOF_JSAMPROW] 474 mov ebx, JSAMPROW [edi+3*SIZEOF_JSAMPROW] 475 movq MMWORD [edx+eax*SIZEOF_JSAMPLE], mm5 476 movq MMWORD [ebx+eax*SIZEOF_JSAMPLE], mm1 477 478 poppic ebx ; restore GOT address 479 480 add esi, byte 4*SIZEOF_JCOEF ; wsptr 481 add edi, byte 4*SIZEOF_JSAMPROW 482 dec ecx ; ctr 483 jnz near .rowloop 484 485 emms ; empty MMX state 486 487 pop edi 488 pop esi 489 ; pop edx ; need not be preserved 490 ; pop ecx ; need not be preserved 491 pop ebx 492 mov esp,ebp ; esp <- aligned ebp 493 pop esp ; esp <- original ebp 494 pop ebp 495 ret 496 497 ; For some reason, the OS X linker does not honor the request to align the 498 ; segment unless we do this. 499 align 16 500
