1 ; 2 ; jimmxfst.asm - fast integer IDCT (MMX) 3 ; 4 ; Copyright 2009 Pierre Ossman <ossman (a] cendio.se> for Cendio AB 5 ; 6 ; Based on 7 ; x86 SIMD extension for IJG JPEG library 8 ; Copyright (C) 1999-2006, MIYASAKA Masaru. 9 ; For conditions of distribution and use, see copyright notice in jsimdext.inc 10 ; 11 ; This file should be assembled with NASM (Netwide Assembler), 12 ; can *not* be assembled with Microsoft's MASM or any compatible 13 ; assembler (including Borland's Turbo Assembler). 14 ; NASM is available from http://nasm.sourceforge.net/ or 15 ; http://sourceforge.net/project/showfiles.php?group_id=6208 16 ; 17 ; This file contains a fast, not so accurate integer implementation of 18 ; the inverse DCT (Discrete Cosine Transform). The following code is 19 ; based directly on the IJG's original jidctfst.c; see the jidctfst.c 20 ; for more details. 21 ; 22 ; [TAB8] 23 24 %include "jsimdext.inc" 25 %include "jdct.inc" 26 27 ; -------------------------------------------------------------------------- 28 29 %define CONST_BITS 8 ; 14 is also OK. 30 %define PASS1_BITS 2 31 32 %if IFAST_SCALE_BITS != PASS1_BITS 33 %error "'IFAST_SCALE_BITS' must be equal to 'PASS1_BITS'." 34 %endif 35 36 %if CONST_BITS == 8 37 F_1_082 equ 277 ; FIX(1.082392200) 38 F_1_414 equ 362 ; FIX(1.414213562) 39 F_1_847 equ 473 ; FIX(1.847759065) 40 F_2_613 equ 669 ; FIX(2.613125930) 41 F_1_613 equ (F_2_613 - 256) ; FIX(2.613125930) - FIX(1) 42 %else 43 ; NASM cannot do compile-time arithmetic on floating-point constants. 44 %define DESCALE(x,n) (((x)+(1<<((n)-1)))>>(n)) 45 F_1_082 equ DESCALE(1162209775,30-CONST_BITS) ; FIX(1.082392200) 46 F_1_414 equ DESCALE(1518500249,30-CONST_BITS) ; FIX(1.414213562) 47 F_1_847 equ DESCALE(1984016188,30-CONST_BITS) ; FIX(1.847759065) 48 F_2_613 equ DESCALE(2805822602,30-CONST_BITS) ; FIX(2.613125930) 49 F_1_613 equ (F_2_613 - (1 << CONST_BITS)) ; FIX(2.613125930) - FIX(1) 50 %endif 51 52 ; -------------------------------------------------------------------------- 53 SECTION SEG_CONST 54 55 ; PRE_MULTIPLY_SCALE_BITS <= 2 (to avoid overflow) 56 ; CONST_BITS + CONST_SHIFT + PRE_MULTIPLY_SCALE_BITS == 16 (for pmulhw) 57 58 %define PRE_MULTIPLY_SCALE_BITS 2 59 %define CONST_SHIFT (16 - PRE_MULTIPLY_SCALE_BITS - CONST_BITS) 60 61 alignz 16 62 global EXTN(jconst_idct_ifast_mmx) PRIVATE 63 64 EXTN(jconst_idct_ifast_mmx): 65 66 PW_F1414 times 4 dw F_1_414 << CONST_SHIFT 67 PW_F1847 times 4 dw F_1_847 << CONST_SHIFT 68 PW_MF1613 times 4 dw -F_1_613 << CONST_SHIFT 69 PW_F1082 times 4 dw F_1_082 << CONST_SHIFT 70 PB_CENTERJSAMP times 8 db CENTERJSAMPLE 71 72 alignz 16 73 74 ; -------------------------------------------------------------------------- 75 SECTION SEG_TEXT 76 BITS 32 77 ; 78 ; Perform dequantization and inverse DCT on one block of coefficients. 79 ; 80 ; GLOBAL(void) 81 ; jsimd_idct_ifast_mmx (void * dct_table, JCOEFPTR coef_block, 82 ; JSAMPARRAY output_buf, JDIMENSION output_col) 83 ; 84 85 %define dct_table(b) (b)+8 ; jpeg_component_info * compptr 86 %define coef_block(b) (b)+12 ; JCOEFPTR coef_block 87 %define output_buf(b) (b)+16 ; JSAMPARRAY output_buf 88 %define output_col(b) (b)+20 ; JDIMENSION output_col 89 90 %define original_ebp ebp+0 91 %define wk(i) ebp-(WK_NUM-(i))*SIZEOF_MMWORD ; mmword wk[WK_NUM] 92 %define WK_NUM 2 93 %define workspace wk(0)-DCTSIZE2*SIZEOF_JCOEF 94 ; JCOEF workspace[DCTSIZE2] 95 96 align 16 97 global EXTN(jsimd_idct_ifast_mmx) PRIVATE 98 99 EXTN(jsimd_idct_ifast_mmx): 100 push ebp 101 mov eax,esp ; eax = original ebp 102 sub esp, byte 4 103 and esp, byte (-SIZEOF_MMWORD) ; align to 64 bits 104 mov [esp],eax 105 mov ebp,esp ; ebp = aligned ebp 106 lea esp, [workspace] 107 push ebx 108 ; push ecx ; need not be preserved 109 ; push edx ; need not be preserved 110 push esi 111 push edi 112 113 get_GOT ebx ; get GOT address 114 115 ; ---- Pass 1: process columns from input, store into work array. 116 117 ; mov eax, [original_ebp] 118 mov edx, POINTER [dct_table(eax)] ; quantptr 119 mov esi, JCOEFPTR [coef_block(eax)] ; inptr 120 lea edi, [workspace] ; JCOEF * wsptr 121 mov ecx, DCTSIZE/4 ; ctr 122 alignx 16,7 123 .columnloop: 124 %ifndef NO_ZERO_COLUMN_TEST_IFAST_MMX 125 mov eax, DWORD [DWBLOCK(1,0,esi,SIZEOF_JCOEF)] 126 or eax, DWORD [DWBLOCK(2,0,esi,SIZEOF_JCOEF)] 127 jnz short .columnDCT 128 129 movq mm0, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)] 130 movq mm1, MMWORD [MMBLOCK(2,0,esi,SIZEOF_JCOEF)] 131 por mm0, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)] 132 por mm1, MMWORD [MMBLOCK(4,0,esi,SIZEOF_JCOEF)] 133 por mm0, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)] 134 por mm1, MMWORD [MMBLOCK(6,0,esi,SIZEOF_JCOEF)] 135 por mm0, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)] 136 por mm1,mm0 137 packsswb mm1,mm1 138 movd eax,mm1 139 test eax,eax 140 jnz short .columnDCT 141 142 ; -- AC terms all zero 143 144 movq mm0, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)] 145 pmullw mm0, MMWORD [MMBLOCK(0,0,edx,SIZEOF_IFAST_MULT_TYPE)] 146 147 movq mm2,mm0 ; mm0=in0=(00 01 02 03) 148 punpcklwd mm0,mm0 ; mm0=(00 00 01 01) 149 punpckhwd mm2,mm2 ; mm2=(02 02 03 03) 150 151 movq mm1,mm0 152 punpckldq mm0,mm0 ; mm0=(00 00 00 00) 153 punpckhdq mm1,mm1 ; mm1=(01 01 01 01) 154 movq mm3,mm2 155 punpckldq mm2,mm2 ; mm2=(02 02 02 02) 156 punpckhdq mm3,mm3 ; mm3=(03 03 03 03) 157 158 movq MMWORD [MMBLOCK(0,0,edi,SIZEOF_JCOEF)], mm0 159 movq MMWORD [MMBLOCK(0,1,edi,SIZEOF_JCOEF)], mm0 160 movq MMWORD [MMBLOCK(1,0,edi,SIZEOF_JCOEF)], mm1 161 movq MMWORD [MMBLOCK(1,1,edi,SIZEOF_JCOEF)], mm1 162 movq MMWORD [MMBLOCK(2,0,edi,SIZEOF_JCOEF)], mm2 163 movq MMWORD [MMBLOCK(2,1,edi,SIZEOF_JCOEF)], mm2 164 movq MMWORD [MMBLOCK(3,0,edi,SIZEOF_JCOEF)], mm3 165 movq MMWORD [MMBLOCK(3,1,edi,SIZEOF_JCOEF)], mm3 166 jmp near .nextcolumn 167 alignx 16,7 168 %endif 169 .columnDCT: 170 171 ; -- Even part 172 173 movq mm0, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)] 174 movq mm1, MMWORD [MMBLOCK(2,0,esi,SIZEOF_JCOEF)] 175 pmullw mm0, MMWORD [MMBLOCK(0,0,edx,SIZEOF_IFAST_MULT_TYPE)] 176 pmullw mm1, MMWORD [MMBLOCK(2,0,edx,SIZEOF_IFAST_MULT_TYPE)] 177 movq mm2, MMWORD [MMBLOCK(4,0,esi,SIZEOF_JCOEF)] 178 movq mm3, MMWORD [MMBLOCK(6,0,esi,SIZEOF_JCOEF)] 179 pmullw mm2, MMWORD [MMBLOCK(4,0,edx,SIZEOF_IFAST_MULT_TYPE)] 180 pmullw mm3, MMWORD [MMBLOCK(6,0,edx,SIZEOF_IFAST_MULT_TYPE)] 181 182 movq mm4,mm0 183 movq mm5,mm1 184 psubw mm0,mm2 ; mm0=tmp11 185 psubw mm1,mm3 186 paddw mm4,mm2 ; mm4=tmp10 187 paddw mm5,mm3 ; mm5=tmp13 188 189 psllw mm1,PRE_MULTIPLY_SCALE_BITS 190 pmulhw mm1,[GOTOFF(ebx,PW_F1414)] 191 psubw mm1,mm5 ; mm1=tmp12 192 193 movq mm6,mm4 194 movq mm7,mm0 195 psubw mm4,mm5 ; mm4=tmp3 196 psubw mm0,mm1 ; mm0=tmp2 197 paddw mm6,mm5 ; mm6=tmp0 198 paddw mm7,mm1 ; mm7=tmp1 199 200 movq MMWORD [wk(1)], mm4 ; wk(1)=tmp3 201 movq MMWORD [wk(0)], mm0 ; wk(0)=tmp2 202 203 ; -- Odd part 204 205 movq mm2, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)] 206 movq mm3, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)] 207 pmullw mm2, MMWORD [MMBLOCK(1,0,edx,SIZEOF_IFAST_MULT_TYPE)] 208 pmullw mm3, MMWORD [MMBLOCK(3,0,edx,SIZEOF_IFAST_MULT_TYPE)] 209 movq mm5, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)] 210 movq mm1, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)] 211 pmullw mm5, MMWORD [MMBLOCK(5,0,edx,SIZEOF_IFAST_MULT_TYPE)] 212 pmullw mm1, MMWORD [MMBLOCK(7,0,edx,SIZEOF_IFAST_MULT_TYPE)] 213 214 movq mm4,mm2 215 movq mm0,mm5 216 psubw mm2,mm1 ; mm2=z12 217 psubw mm5,mm3 ; mm5=z10 218 paddw mm4,mm1 ; mm4=z11 219 paddw mm0,mm3 ; mm0=z13 220 221 movq mm1,mm5 ; mm1=z10(unscaled) 222 psllw mm2,PRE_MULTIPLY_SCALE_BITS 223 psllw mm5,PRE_MULTIPLY_SCALE_BITS 224 225 movq mm3,mm4 226 psubw mm4,mm0 227 paddw mm3,mm0 ; mm3=tmp7 228 229 psllw mm4,PRE_MULTIPLY_SCALE_BITS 230 pmulhw mm4,[GOTOFF(ebx,PW_F1414)] ; mm4=tmp11 231 232 ; To avoid overflow... 233 ; 234 ; (Original) 235 ; tmp12 = -2.613125930 * z10 + z5; 236 ; 237 ; (This implementation) 238 ; tmp12 = (-1.613125930 - 1) * z10 + z5; 239 ; = -1.613125930 * z10 - z10 + z5; 240 241 movq mm0,mm5 242 paddw mm5,mm2 243 pmulhw mm5,[GOTOFF(ebx,PW_F1847)] ; mm5=z5 244 pmulhw mm0,[GOTOFF(ebx,PW_MF1613)] 245 pmulhw mm2,[GOTOFF(ebx,PW_F1082)] 246 psubw mm0,mm1 247 psubw mm2,mm5 ; mm2=tmp10 248 paddw mm0,mm5 ; mm0=tmp12 249 250 ; -- Final output stage 251 252 psubw mm0,mm3 ; mm0=tmp6 253 movq mm1,mm6 254 movq mm5,mm7 255 paddw mm6,mm3 ; mm6=data0=(00 01 02 03) 256 paddw mm7,mm0 ; mm7=data1=(10 11 12 13) 257 psubw mm1,mm3 ; mm1=data7=(70 71 72 73) 258 psubw mm5,mm0 ; mm5=data6=(60 61 62 63) 259 psubw mm4,mm0 ; mm4=tmp5 260 261 movq mm3,mm6 ; transpose coefficients(phase 1) 262 punpcklwd mm6,mm7 ; mm6=(00 10 01 11) 263 punpckhwd mm3,mm7 ; mm3=(02 12 03 13) 264 movq mm0,mm5 ; transpose coefficients(phase 1) 265 punpcklwd mm5,mm1 ; mm5=(60 70 61 71) 266 punpckhwd mm0,mm1 ; mm0=(62 72 63 73) 267 268 movq mm7, MMWORD [wk(0)] ; mm7=tmp2 269 movq mm1, MMWORD [wk(1)] ; mm1=tmp3 270 271 movq MMWORD [wk(0)], mm5 ; wk(0)=(60 70 61 71) 272 movq MMWORD [wk(1)], mm0 ; wk(1)=(62 72 63 73) 273 274 paddw mm2,mm4 ; mm2=tmp4 275 movq mm5,mm7 276 movq mm0,mm1 277 paddw mm7,mm4 ; mm7=data2=(20 21 22 23) 278 paddw mm1,mm2 ; mm1=data4=(40 41 42 43) 279 psubw mm5,mm4 ; mm5=data5=(50 51 52 53) 280 psubw mm0,mm2 ; mm0=data3=(30 31 32 33) 281 282 movq mm4,mm7 ; transpose coefficients(phase 1) 283 punpcklwd mm7,mm0 ; mm7=(20 30 21 31) 284 punpckhwd mm4,mm0 ; mm4=(22 32 23 33) 285 movq mm2,mm1 ; transpose coefficients(phase 1) 286 punpcklwd mm1,mm5 ; mm1=(40 50 41 51) 287 punpckhwd mm2,mm5 ; mm2=(42 52 43 53) 288 289 movq mm0,mm6 ; transpose coefficients(phase 2) 290 punpckldq mm6,mm7 ; mm6=(00 10 20 30) 291 punpckhdq mm0,mm7 ; mm0=(01 11 21 31) 292 movq mm5,mm3 ; transpose coefficients(phase 2) 293 punpckldq mm3,mm4 ; mm3=(02 12 22 32) 294 punpckhdq mm5,mm4 ; mm5=(03 13 23 33) 295 296 movq mm7, MMWORD [wk(0)] ; mm7=(60 70 61 71) 297 movq mm4, MMWORD [wk(1)] ; mm4=(62 72 63 73) 298 299 movq MMWORD [MMBLOCK(0,0,edi,SIZEOF_JCOEF)], mm6 300 movq MMWORD [MMBLOCK(1,0,edi,SIZEOF_JCOEF)], mm0 301 movq MMWORD [MMBLOCK(2,0,edi,SIZEOF_JCOEF)], mm3 302 movq MMWORD [MMBLOCK(3,0,edi,SIZEOF_JCOEF)], mm5 303 304 movq mm6,mm1 ; transpose coefficients(phase 2) 305 punpckldq mm1,mm7 ; mm1=(40 50 60 70) 306 punpckhdq mm6,mm7 ; mm6=(41 51 61 71) 307 movq mm0,mm2 ; transpose coefficients(phase 2) 308 punpckldq mm2,mm4 ; mm2=(42 52 62 72) 309 punpckhdq mm0,mm4 ; mm0=(43 53 63 73) 310 311 movq MMWORD [MMBLOCK(0,1,edi,SIZEOF_JCOEF)], mm1 312 movq MMWORD [MMBLOCK(1,1,edi,SIZEOF_JCOEF)], mm6 313 movq MMWORD [MMBLOCK(2,1,edi,SIZEOF_JCOEF)], mm2 314 movq MMWORD [MMBLOCK(3,1,edi,SIZEOF_JCOEF)], mm0 315 316 .nextcolumn: 317 add esi, byte 4*SIZEOF_JCOEF ; coef_block 318 add edx, byte 4*SIZEOF_IFAST_MULT_TYPE ; quantptr 319 add edi, byte 4*DCTSIZE*SIZEOF_JCOEF ; wsptr 320 dec ecx ; ctr 321 jnz near .columnloop 322 323 ; ---- Pass 2: process rows from work array, store into output array. 324 325 mov eax, [original_ebp] 326 lea esi, [workspace] ; JCOEF * wsptr 327 mov edi, JSAMPARRAY [output_buf(eax)] ; (JSAMPROW *) 328 mov eax, JDIMENSION [output_col(eax)] 329 mov ecx, DCTSIZE/4 ; ctr 330 alignx 16,7 331 .rowloop: 332 333 ; -- Even part 334 335 movq mm0, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)] 336 movq mm1, MMWORD [MMBLOCK(2,0,esi,SIZEOF_JCOEF)] 337 movq mm2, MMWORD [MMBLOCK(4,0,esi,SIZEOF_JCOEF)] 338 movq mm3, MMWORD [MMBLOCK(6,0,esi,SIZEOF_JCOEF)] 339 340 movq mm4,mm0 341 movq mm5,mm1 342 psubw mm0,mm2 ; mm0=tmp11 343 psubw mm1,mm3 344 paddw mm4,mm2 ; mm4=tmp10 345 paddw mm5,mm3 ; mm5=tmp13 346 347 psllw mm1,PRE_MULTIPLY_SCALE_BITS 348 pmulhw mm1,[GOTOFF(ebx,PW_F1414)] 349 psubw mm1,mm5 ; mm1=tmp12 350 351 movq mm6,mm4 352 movq mm7,mm0 353 psubw mm4,mm5 ; mm4=tmp3 354 psubw mm0,mm1 ; mm0=tmp2 355 paddw mm6,mm5 ; mm6=tmp0 356 paddw mm7,mm1 ; mm7=tmp1 357 358 movq MMWORD [wk(1)], mm4 ; wk(1)=tmp3 359 movq MMWORD [wk(0)], mm0 ; wk(0)=tmp2 360 361 ; -- Odd part 362 363 movq mm2, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)] 364 movq mm3, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)] 365 movq mm5, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)] 366 movq mm1, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)] 367 368 movq mm4,mm2 369 movq mm0,mm5 370 psubw mm2,mm1 ; mm2=z12 371 psubw mm5,mm3 ; mm5=z10 372 paddw mm4,mm1 ; mm4=z11 373 paddw mm0,mm3 ; mm0=z13 374 375 movq mm1,mm5 ; mm1=z10(unscaled) 376 psllw mm2,PRE_MULTIPLY_SCALE_BITS 377 psllw mm5,PRE_MULTIPLY_SCALE_BITS 378 379 movq mm3,mm4 380 psubw mm4,mm0 381 paddw mm3,mm0 ; mm3=tmp7 382 383 psllw mm4,PRE_MULTIPLY_SCALE_BITS 384 pmulhw mm4,[GOTOFF(ebx,PW_F1414)] ; mm4=tmp11 385 386 ; To avoid overflow... 387 ; 388 ; (Original) 389 ; tmp12 = -2.613125930 * z10 + z5; 390 ; 391 ; (This implementation) 392 ; tmp12 = (-1.613125930 - 1) * z10 + z5; 393 ; = -1.613125930 * z10 - z10 + z5; 394 395 movq mm0,mm5 396 paddw mm5,mm2 397 pmulhw mm5,[GOTOFF(ebx,PW_F1847)] ; mm5=z5 398 pmulhw mm0,[GOTOFF(ebx,PW_MF1613)] 399 pmulhw mm2,[GOTOFF(ebx,PW_F1082)] 400 psubw mm0,mm1 401 psubw mm2,mm5 ; mm2=tmp10 402 paddw mm0,mm5 ; mm0=tmp12 403 404 ; -- Final output stage 405 406 psubw mm0,mm3 ; mm0=tmp6 407 movq mm1,mm6 408 movq mm5,mm7 409 paddw mm6,mm3 ; mm6=data0=(00 10 20 30) 410 paddw mm7,mm0 ; mm7=data1=(01 11 21 31) 411 psraw mm6,(PASS1_BITS+3) ; descale 412 psraw mm7,(PASS1_BITS+3) ; descale 413 psubw mm1,mm3 ; mm1=data7=(07 17 27 37) 414 psubw mm5,mm0 ; mm5=data6=(06 16 26 36) 415 psraw mm1,(PASS1_BITS+3) ; descale 416 psraw mm5,(PASS1_BITS+3) ; descale 417 psubw mm4,mm0 ; mm4=tmp5 418 419 packsswb mm6,mm5 ; mm6=(00 10 20 30 06 16 26 36) 420 packsswb mm7,mm1 ; mm7=(01 11 21 31 07 17 27 37) 421 422 movq mm3, MMWORD [wk(0)] ; mm3=tmp2 423 movq mm0, MMWORD [wk(1)] ; mm0=tmp3 424 425 paddw mm2,mm4 ; mm2=tmp4 426 movq mm5,mm3 427 movq mm1,mm0 428 paddw mm3,mm4 ; mm3=data2=(02 12 22 32) 429 paddw mm0,mm2 ; mm0=data4=(04 14 24 34) 430 psraw mm3,(PASS1_BITS+3) ; descale 431 psraw mm0,(PASS1_BITS+3) ; descale 432 psubw mm5,mm4 ; mm5=data5=(05 15 25 35) 433 psubw mm1,mm2 ; mm1=data3=(03 13 23 33) 434 psraw mm5,(PASS1_BITS+3) ; descale 435 psraw mm1,(PASS1_BITS+3) ; descale 436 437 movq mm4,[GOTOFF(ebx,PB_CENTERJSAMP)] ; mm4=[PB_CENTERJSAMP] 438 439 packsswb mm3,mm0 ; mm3=(02 12 22 32 04 14 24 34) 440 packsswb mm1,mm5 ; mm1=(03 13 23 33 05 15 25 35) 441 442 paddb mm6,mm4 443 paddb mm7,mm4 444 paddb mm3,mm4 445 paddb mm1,mm4 446 447 movq mm2,mm6 ; transpose coefficients(phase 1) 448 punpcklbw mm6,mm7 ; mm6=(00 01 10 11 20 21 30 31) 449 punpckhbw mm2,mm7 ; mm2=(06 07 16 17 26 27 36 37) 450 movq mm0,mm3 ; transpose coefficients(phase 1) 451 punpcklbw mm3,mm1 ; mm3=(02 03 12 13 22 23 32 33) 452 punpckhbw mm0,mm1 ; mm0=(04 05 14 15 24 25 34 35) 453 454 movq mm5,mm6 ; transpose coefficients(phase 2) 455 punpcklwd mm6,mm3 ; mm6=(00 01 02 03 10 11 12 13) 456 punpckhwd mm5,mm3 ; mm5=(20 21 22 23 30 31 32 33) 457 movq mm4,mm0 ; transpose coefficients(phase 2) 458 punpcklwd mm0,mm2 ; mm0=(04 05 06 07 14 15 16 17) 459 punpckhwd mm4,mm2 ; mm4=(24 25 26 27 34 35 36 37) 460 461 movq mm7,mm6 ; transpose coefficients(phase 3) 462 punpckldq mm6,mm0 ; mm6=(00 01 02 03 04 05 06 07) 463 punpckhdq mm7,mm0 ; mm7=(10 11 12 13 14 15 16 17) 464 movq mm1,mm5 ; transpose coefficients(phase 3) 465 punpckldq mm5,mm4 ; mm5=(20 21 22 23 24 25 26 27) 466 punpckhdq mm1,mm4 ; mm1=(30 31 32 33 34 35 36 37) 467 468 pushpic ebx ; save GOT address 469 470 mov edx, JSAMPROW [edi+0*SIZEOF_JSAMPROW] 471 mov ebx, JSAMPROW [edi+1*SIZEOF_JSAMPROW] 472 movq MMWORD [edx+eax*SIZEOF_JSAMPLE], mm6 473 movq MMWORD [ebx+eax*SIZEOF_JSAMPLE], mm7 474 mov edx, JSAMPROW [edi+2*SIZEOF_JSAMPROW] 475 mov ebx, JSAMPROW [edi+3*SIZEOF_JSAMPROW] 476 movq MMWORD [edx+eax*SIZEOF_JSAMPLE], mm5 477 movq MMWORD [ebx+eax*SIZEOF_JSAMPLE], mm1 478 479 poppic ebx ; restore GOT address 480 481 add esi, byte 4*SIZEOF_JCOEF ; wsptr 482 add edi, byte 4*SIZEOF_JSAMPROW 483 dec ecx ; ctr 484 jnz near .rowloop 485 486 emms ; empty MMX state 487 488 pop edi 489 pop esi 490 ; pop edx ; need not be preserved 491 ; pop ecx ; need not be preserved 492 pop ebx 493 mov esp,ebp ; esp <- aligned ebp 494 pop esp ; esp <- original ebp 495 pop ebp 496 ret 497 498 ; For some reason, the OS X linker does not honor the request to align the 499 ; segment unless we do this. 500 align 16 501
