1 ; 2 ; jidctred.asm - reduced-size 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 inverse-DCT routines that produce reduced-size 18 ; output: either 4x4 or 2x2 pixels from an 8x8 DCT block. 19 ; The following code is based directly on the IJG's original jidctred.c; 20 ; see the jidctred.c for more details. 21 ; 22 ; [TAB8] 23 24 %include "jsimdext.inc" 25 %include "jdct.inc" 26 27 ; -------------------------------------------------------------------------- 28 29 %define CONST_BITS 13 30 %define PASS1_BITS 2 31 32 %define DESCALE_P1_4 (CONST_BITS-PASS1_BITS+1) 33 %define DESCALE_P2_4 (CONST_BITS+PASS1_BITS+3+1) 34 %define DESCALE_P1_2 (CONST_BITS-PASS1_BITS+2) 35 %define DESCALE_P2_2 (CONST_BITS+PASS1_BITS+3+2) 36 37 %if CONST_BITS == 13 38 F_0_211 equ 1730 ; FIX(0.211164243) 39 F_0_509 equ 4176 ; FIX(0.509795579) 40 F_0_601 equ 4926 ; FIX(0.601344887) 41 F_0_720 equ 5906 ; FIX(0.720959822) 42 F_0_765 equ 6270 ; FIX(0.765366865) 43 F_0_850 equ 6967 ; FIX(0.850430095) 44 F_0_899 equ 7373 ; FIX(0.899976223) 45 F_1_061 equ 8697 ; FIX(1.061594337) 46 F_1_272 equ 10426 ; FIX(1.272758580) 47 F_1_451 equ 11893 ; FIX(1.451774981) 48 F_1_847 equ 15137 ; FIX(1.847759065) 49 F_2_172 equ 17799 ; FIX(2.172734803) 50 F_2_562 equ 20995 ; FIX(2.562915447) 51 F_3_624 equ 29692 ; FIX(3.624509785) 52 %else 53 ; NASM cannot do compile-time arithmetic on floating-point constants. 54 %define DESCALE(x,n) (((x)+(1<<((n)-1)))>>(n)) 55 F_0_211 equ DESCALE( 226735879,30-CONST_BITS) ; FIX(0.211164243) 56 F_0_509 equ DESCALE( 547388834,30-CONST_BITS) ; FIX(0.509795579) 57 F_0_601 equ DESCALE( 645689155,30-CONST_BITS) ; FIX(0.601344887) 58 F_0_720 equ DESCALE( 774124714,30-CONST_BITS) ; FIX(0.720959822) 59 F_0_765 equ DESCALE( 821806413,30-CONST_BITS) ; FIX(0.765366865) 60 F_0_850 equ DESCALE( 913142361,30-CONST_BITS) ; FIX(0.850430095) 61 F_0_899 equ DESCALE( 966342111,30-CONST_BITS) ; FIX(0.899976223) 62 F_1_061 equ DESCALE(1139878239,30-CONST_BITS) ; FIX(1.061594337) 63 F_1_272 equ DESCALE(1366614119,30-CONST_BITS) ; FIX(1.272758580) 64 F_1_451 equ DESCALE(1558831516,30-CONST_BITS) ; FIX(1.451774981) 65 F_1_847 equ DESCALE(1984016188,30-CONST_BITS) ; FIX(1.847759065) 66 F_2_172 equ DESCALE(2332956230,30-CONST_BITS) ; FIX(2.172734803) 67 F_2_562 equ DESCALE(2751909506,30-CONST_BITS) ; FIX(2.562915447) 68 F_3_624 equ DESCALE(3891787747,30-CONST_BITS) ; FIX(3.624509785) 69 %endif 70 71 ; -------------------------------------------------------------------------- 72 SECTION SEG_CONST 73 74 alignz 16 75 global EXTN(jconst_idct_red_mmx) 76 77 EXTN(jconst_idct_red_mmx): 78 79 PW_F184_MF076 times 2 dw F_1_847,-F_0_765 80 PW_F256_F089 times 2 dw F_2_562, F_0_899 81 PW_F106_MF217 times 2 dw F_1_061,-F_2_172 82 PW_MF060_MF050 times 2 dw -F_0_601,-F_0_509 83 PW_F145_MF021 times 2 dw F_1_451,-F_0_211 84 PW_F362_MF127 times 2 dw F_3_624,-F_1_272 85 PW_F085_MF072 times 2 dw F_0_850,-F_0_720 86 PD_DESCALE_P1_4 times 2 dd 1 << (DESCALE_P1_4-1) 87 PD_DESCALE_P2_4 times 2 dd 1 << (DESCALE_P2_4-1) 88 PD_DESCALE_P1_2 times 2 dd 1 << (DESCALE_P1_2-1) 89 PD_DESCALE_P2_2 times 2 dd 1 << (DESCALE_P2_2-1) 90 PB_CENTERJSAMP times 8 db CENTERJSAMPLE 91 92 alignz 16 93 94 ; -------------------------------------------------------------------------- 95 SECTION SEG_TEXT 96 BITS 32 97 ; 98 ; Perform dequantization and inverse DCT on one block of coefficients, 99 ; producing a reduced-size 4x4 output block. 100 ; 101 ; GLOBAL(void) 102 ; jsimd_idct_4x4_mmx (void * dct_table, JCOEFPTR coef_block, 103 ; JSAMPARRAY output_buf, JDIMENSION output_col) 104 ; 105 106 %define dct_table(b) (b)+8 ; void * dct_table 107 %define coef_block(b) (b)+12 ; JCOEFPTR coef_block 108 %define output_buf(b) (b)+16 ; JSAMPARRAY output_buf 109 %define output_col(b) (b)+20 ; JDIMENSION output_col 110 111 %define original_ebp ebp+0 112 %define wk(i) ebp-(WK_NUM-(i))*SIZEOF_MMWORD ; mmword wk[WK_NUM] 113 %define WK_NUM 2 114 %define workspace wk(0)-DCTSIZE2*SIZEOF_JCOEF 115 ; JCOEF workspace[DCTSIZE2] 116 117 align 16 118 global EXTN(jsimd_idct_4x4_mmx) 119 120 EXTN(jsimd_idct_4x4_mmx): 121 push ebp 122 mov eax,esp ; eax = original ebp 123 sub esp, byte 4 124 and esp, byte (-SIZEOF_MMWORD) ; align to 64 bits 125 mov [esp],eax 126 mov ebp,esp ; ebp = aligned ebp 127 lea esp, [workspace] 128 pushpic ebx 129 ; push ecx ; need not be preserved 130 ; push edx ; need not be preserved 131 push esi 132 push edi 133 134 get_GOT ebx ; get GOT address 135 136 ; ---- Pass 1: process columns from input, store into work array. 137 138 ; mov eax, [original_ebp] 139 mov edx, POINTER [dct_table(eax)] ; quantptr 140 mov esi, JCOEFPTR [coef_block(eax)] ; inptr 141 lea edi, [workspace] ; JCOEF * wsptr 142 mov ecx, DCTSIZE/4 ; ctr 143 alignx 16,7 144 .columnloop: 145 %ifndef NO_ZERO_COLUMN_TEST_4X4_MMX 146 mov eax, DWORD [DWBLOCK(1,0,esi,SIZEOF_JCOEF)] 147 or eax, DWORD [DWBLOCK(2,0,esi,SIZEOF_JCOEF)] 148 jnz short .columnDCT 149 150 movq mm0, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)] 151 movq mm1, MMWORD [MMBLOCK(2,0,esi,SIZEOF_JCOEF)] 152 por mm0, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)] 153 por mm1, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)] 154 por mm0, MMWORD [MMBLOCK(6,0,esi,SIZEOF_JCOEF)] 155 por mm1, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)] 156 por mm0,mm1 157 packsswb mm0,mm0 158 movd eax,mm0 159 test eax,eax 160 jnz short .columnDCT 161 162 ; -- AC terms all zero 163 164 movq mm0, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)] 165 pmullw mm0, MMWORD [MMBLOCK(0,0,edx,SIZEOF_ISLOW_MULT_TYPE)] 166 167 psllw mm0,PASS1_BITS 168 169 movq mm2,mm0 ; mm0=in0=(00 01 02 03) 170 punpcklwd mm0,mm0 ; mm0=(00 00 01 01) 171 punpckhwd mm2,mm2 ; mm2=(02 02 03 03) 172 173 movq mm1,mm0 174 punpckldq mm0,mm0 ; mm0=(00 00 00 00) 175 punpckhdq mm1,mm1 ; mm1=(01 01 01 01) 176 movq mm3,mm2 177 punpckldq mm2,mm2 ; mm2=(02 02 02 02) 178 punpckhdq mm3,mm3 ; mm3=(03 03 03 03) 179 180 movq MMWORD [MMBLOCK(0,0,edi,SIZEOF_JCOEF)], mm0 181 movq MMWORD [MMBLOCK(1,0,edi,SIZEOF_JCOEF)], mm1 182 movq MMWORD [MMBLOCK(2,0,edi,SIZEOF_JCOEF)], mm2 183 movq MMWORD [MMBLOCK(3,0,edi,SIZEOF_JCOEF)], mm3 184 jmp near .nextcolumn 185 alignx 16,7 186 %endif 187 .columnDCT: 188 189 ; -- Odd part 190 191 movq mm0, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)] 192 movq mm1, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)] 193 pmullw mm0, MMWORD [MMBLOCK(1,0,edx,SIZEOF_ISLOW_MULT_TYPE)] 194 pmullw mm1, MMWORD [MMBLOCK(3,0,edx,SIZEOF_ISLOW_MULT_TYPE)] 195 movq mm2, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)] 196 movq mm3, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)] 197 pmullw mm2, MMWORD [MMBLOCK(5,0,edx,SIZEOF_ISLOW_MULT_TYPE)] 198 pmullw mm3, MMWORD [MMBLOCK(7,0,edx,SIZEOF_ISLOW_MULT_TYPE)] 199 200 movq mm4,mm0 201 movq mm5,mm0 202 punpcklwd mm4,mm1 203 punpckhwd mm5,mm1 204 movq mm0,mm4 205 movq mm1,mm5 206 pmaddwd mm4,[GOTOFF(ebx,PW_F256_F089)] ; mm4=(tmp2L) 207 pmaddwd mm5,[GOTOFF(ebx,PW_F256_F089)] ; mm5=(tmp2H) 208 pmaddwd mm0,[GOTOFF(ebx,PW_F106_MF217)] ; mm0=(tmp0L) 209 pmaddwd mm1,[GOTOFF(ebx,PW_F106_MF217)] ; mm1=(tmp0H) 210 211 movq mm6,mm2 212 movq mm7,mm2 213 punpcklwd mm6,mm3 214 punpckhwd mm7,mm3 215 movq mm2,mm6 216 movq mm3,mm7 217 pmaddwd mm6,[GOTOFF(ebx,PW_MF060_MF050)] ; mm6=(tmp2L) 218 pmaddwd mm7,[GOTOFF(ebx,PW_MF060_MF050)] ; mm7=(tmp2H) 219 pmaddwd mm2,[GOTOFF(ebx,PW_F145_MF021)] ; mm2=(tmp0L) 220 pmaddwd mm3,[GOTOFF(ebx,PW_F145_MF021)] ; mm3=(tmp0H) 221 222 paddd mm6,mm4 ; mm6=tmp2L 223 paddd mm7,mm5 ; mm7=tmp2H 224 paddd mm2,mm0 ; mm2=tmp0L 225 paddd mm3,mm1 ; mm3=tmp0H 226 227 movq MMWORD [wk(0)], mm2 ; wk(0)=tmp0L 228 movq MMWORD [wk(1)], mm3 ; wk(1)=tmp0H 229 230 ; -- Even part 231 232 movq mm4, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)] 233 movq mm5, MMWORD [MMBLOCK(2,0,esi,SIZEOF_JCOEF)] 234 movq mm0, MMWORD [MMBLOCK(6,0,esi,SIZEOF_JCOEF)] 235 pmullw mm4, MMWORD [MMBLOCK(0,0,edx,SIZEOF_ISLOW_MULT_TYPE)] 236 pmullw mm5, MMWORD [MMBLOCK(2,0,edx,SIZEOF_ISLOW_MULT_TYPE)] 237 pmullw mm0, MMWORD [MMBLOCK(6,0,edx,SIZEOF_ISLOW_MULT_TYPE)] 238 239 pxor mm1,mm1 240 pxor mm2,mm2 241 punpcklwd mm1,mm4 ; mm1=tmp0L 242 punpckhwd mm2,mm4 ; mm2=tmp0H 243 psrad mm1,(16-CONST_BITS-1) ; psrad mm1,16 & pslld mm1,CONST_BITS+1 244 psrad mm2,(16-CONST_BITS-1) ; psrad mm2,16 & pslld mm2,CONST_BITS+1 245 246 movq mm3,mm5 ; mm5=in2=z2 247 punpcklwd mm5,mm0 ; mm0=in6=z3 248 punpckhwd mm3,mm0 249 pmaddwd mm5,[GOTOFF(ebx,PW_F184_MF076)] ; mm5=tmp2L 250 pmaddwd mm3,[GOTOFF(ebx,PW_F184_MF076)] ; mm3=tmp2H 251 252 movq mm4,mm1 253 movq mm0,mm2 254 paddd mm1,mm5 ; mm1=tmp10L 255 paddd mm2,mm3 ; mm2=tmp10H 256 psubd mm4,mm5 ; mm4=tmp12L 257 psubd mm0,mm3 ; mm0=tmp12H 258 259 ; -- Final output stage 260 261 movq mm5,mm1 262 movq mm3,mm2 263 paddd mm1,mm6 ; mm1=data0L 264 paddd mm2,mm7 ; mm2=data0H 265 psubd mm5,mm6 ; mm5=data3L 266 psubd mm3,mm7 ; mm3=data3H 267 268 movq mm6,[GOTOFF(ebx,PD_DESCALE_P1_4)] ; mm6=[PD_DESCALE_P1_4] 269 270 paddd mm1,mm6 271 paddd mm2,mm6 272 psrad mm1,DESCALE_P1_4 273 psrad mm2,DESCALE_P1_4 274 paddd mm5,mm6 275 paddd mm3,mm6 276 psrad mm5,DESCALE_P1_4 277 psrad mm3,DESCALE_P1_4 278 279 packssdw mm1,mm2 ; mm1=data0=(00 01 02 03) 280 packssdw mm5,mm3 ; mm5=data3=(30 31 32 33) 281 282 movq mm7, MMWORD [wk(0)] ; mm7=tmp0L 283 movq mm6, MMWORD [wk(1)] ; mm6=tmp0H 284 285 movq mm2,mm4 286 movq mm3,mm0 287 paddd mm4,mm7 ; mm4=data1L 288 paddd mm0,mm6 ; mm0=data1H 289 psubd mm2,mm7 ; mm2=data2L 290 psubd mm3,mm6 ; mm3=data2H 291 292 movq mm7,[GOTOFF(ebx,PD_DESCALE_P1_4)] ; mm7=[PD_DESCALE_P1_4] 293 294 paddd mm4,mm7 295 paddd mm0,mm7 296 psrad mm4,DESCALE_P1_4 297 psrad mm0,DESCALE_P1_4 298 paddd mm2,mm7 299 paddd mm3,mm7 300 psrad mm2,DESCALE_P1_4 301 psrad mm3,DESCALE_P1_4 302 303 packssdw mm4,mm0 ; mm4=data1=(10 11 12 13) 304 packssdw mm2,mm3 ; mm2=data2=(20 21 22 23) 305 306 movq mm6,mm1 ; transpose coefficients(phase 1) 307 punpcklwd mm1,mm4 ; mm1=(00 10 01 11) 308 punpckhwd mm6,mm4 ; mm6=(02 12 03 13) 309 movq mm7,mm2 ; transpose coefficients(phase 1) 310 punpcklwd mm2,mm5 ; mm2=(20 30 21 31) 311 punpckhwd mm7,mm5 ; mm7=(22 32 23 33) 312 313 movq mm0,mm1 ; transpose coefficients(phase 2) 314 punpckldq mm1,mm2 ; mm1=(00 10 20 30) 315 punpckhdq mm0,mm2 ; mm0=(01 11 21 31) 316 movq mm3,mm6 ; transpose coefficients(phase 2) 317 punpckldq mm6,mm7 ; mm6=(02 12 22 32) 318 punpckhdq mm3,mm7 ; mm3=(03 13 23 33) 319 320 movq MMWORD [MMBLOCK(0,0,edi,SIZEOF_JCOEF)], mm1 321 movq MMWORD [MMBLOCK(1,0,edi,SIZEOF_JCOEF)], mm0 322 movq MMWORD [MMBLOCK(2,0,edi,SIZEOF_JCOEF)], mm6 323 movq MMWORD [MMBLOCK(3,0,edi,SIZEOF_JCOEF)], mm3 324 325 .nextcolumn: 326 add esi, byte 4*SIZEOF_JCOEF ; coef_block 327 add edx, byte 4*SIZEOF_ISLOW_MULT_TYPE ; quantptr 328 add edi, byte 4*DCTSIZE*SIZEOF_JCOEF ; wsptr 329 dec ecx ; ctr 330 jnz near .columnloop 331 332 ; ---- Pass 2: process rows from work array, store into output array. 333 334 mov eax, [original_ebp] 335 lea esi, [workspace] ; JCOEF * wsptr 336 mov edi, JSAMPARRAY [output_buf(eax)] ; (JSAMPROW *) 337 mov eax, JDIMENSION [output_col(eax)] 338 339 ; -- Odd part 340 341 movq mm0, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)] 342 movq mm1, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)] 343 movq mm2, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)] 344 movq mm3, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)] 345 346 movq mm4,mm0 347 movq mm5,mm0 348 punpcklwd mm4,mm1 349 punpckhwd mm5,mm1 350 movq mm0,mm4 351 movq mm1,mm5 352 pmaddwd mm4,[GOTOFF(ebx,PW_F256_F089)] ; mm4=(tmp2L) 353 pmaddwd mm5,[GOTOFF(ebx,PW_F256_F089)] ; mm5=(tmp2H) 354 pmaddwd mm0,[GOTOFF(ebx,PW_F106_MF217)] ; mm0=(tmp0L) 355 pmaddwd mm1,[GOTOFF(ebx,PW_F106_MF217)] ; mm1=(tmp0H) 356 357 movq mm6,mm2 358 movq mm7,mm2 359 punpcklwd mm6,mm3 360 punpckhwd mm7,mm3 361 movq mm2,mm6 362 movq mm3,mm7 363 pmaddwd mm6,[GOTOFF(ebx,PW_MF060_MF050)] ; mm6=(tmp2L) 364 pmaddwd mm7,[GOTOFF(ebx,PW_MF060_MF050)] ; mm7=(tmp2H) 365 pmaddwd mm2,[GOTOFF(ebx,PW_F145_MF021)] ; mm2=(tmp0L) 366 pmaddwd mm3,[GOTOFF(ebx,PW_F145_MF021)] ; mm3=(tmp0H) 367 368 paddd mm6,mm4 ; mm6=tmp2L 369 paddd mm7,mm5 ; mm7=tmp2H 370 paddd mm2,mm0 ; mm2=tmp0L 371 paddd mm3,mm1 ; mm3=tmp0H 372 373 movq MMWORD [wk(0)], mm2 ; wk(0)=tmp0L 374 movq MMWORD [wk(1)], mm3 ; wk(1)=tmp0H 375 376 ; -- Even part 377 378 movq mm4, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)] 379 movq mm5, MMWORD [MMBLOCK(2,0,esi,SIZEOF_JCOEF)] 380 movq mm0, MMWORD [MMBLOCK(6,0,esi,SIZEOF_JCOEF)] 381 382 pxor mm1,mm1 383 pxor mm2,mm2 384 punpcklwd mm1,mm4 ; mm1=tmp0L 385 punpckhwd mm2,mm4 ; mm2=tmp0H 386 psrad mm1,(16-CONST_BITS-1) ; psrad mm1,16 & pslld mm1,CONST_BITS+1 387 psrad mm2,(16-CONST_BITS-1) ; psrad mm2,16 & pslld mm2,CONST_BITS+1 388 389 movq mm3,mm5 ; mm5=in2=z2 390 punpcklwd mm5,mm0 ; mm0=in6=z3 391 punpckhwd mm3,mm0 392 pmaddwd mm5,[GOTOFF(ebx,PW_F184_MF076)] ; mm5=tmp2L 393 pmaddwd mm3,[GOTOFF(ebx,PW_F184_MF076)] ; mm3=tmp2H 394 395 movq mm4,mm1 396 movq mm0,mm2 397 paddd mm1,mm5 ; mm1=tmp10L 398 paddd mm2,mm3 ; mm2=tmp10H 399 psubd mm4,mm5 ; mm4=tmp12L 400 psubd mm0,mm3 ; mm0=tmp12H 401 402 ; -- Final output stage 403 404 movq mm5,mm1 405 movq mm3,mm2 406 paddd mm1,mm6 ; mm1=data0L 407 paddd mm2,mm7 ; mm2=data0H 408 psubd mm5,mm6 ; mm5=data3L 409 psubd mm3,mm7 ; mm3=data3H 410 411 movq mm6,[GOTOFF(ebx,PD_DESCALE_P2_4)] ; mm6=[PD_DESCALE_P2_4] 412 413 paddd mm1,mm6 414 paddd mm2,mm6 415 psrad mm1,DESCALE_P2_4 416 psrad mm2,DESCALE_P2_4 417 paddd mm5,mm6 418 paddd mm3,mm6 419 psrad mm5,DESCALE_P2_4 420 psrad mm3,DESCALE_P2_4 421 422 packssdw mm1,mm2 ; mm1=data0=(00 10 20 30) 423 packssdw mm5,mm3 ; mm5=data3=(03 13 23 33) 424 425 movq mm7, MMWORD [wk(0)] ; mm7=tmp0L 426 movq mm6, MMWORD [wk(1)] ; mm6=tmp0H 427 428 movq mm2,mm4 429 movq mm3,mm0 430 paddd mm4,mm7 ; mm4=data1L 431 paddd mm0,mm6 ; mm0=data1H 432 psubd mm2,mm7 ; mm2=data2L 433 psubd mm3,mm6 ; mm3=data2H 434 435 movq mm7,[GOTOFF(ebx,PD_DESCALE_P2_4)] ; mm7=[PD_DESCALE_P2_4] 436 437 paddd mm4,mm7 438 paddd mm0,mm7 439 psrad mm4,DESCALE_P2_4 440 psrad mm0,DESCALE_P2_4 441 paddd mm2,mm7 442 paddd mm3,mm7 443 psrad mm2,DESCALE_P2_4 444 psrad mm3,DESCALE_P2_4 445 446 packssdw mm4,mm0 ; mm4=data1=(01 11 21 31) 447 packssdw mm2,mm3 ; mm2=data2=(02 12 22 32) 448 449 movq mm6,[GOTOFF(ebx,PB_CENTERJSAMP)] ; mm6=[PB_CENTERJSAMP] 450 451 packsswb mm1,mm2 ; mm1=(00 10 20 30 02 12 22 32) 452 packsswb mm4,mm5 ; mm4=(01 11 21 31 03 13 23 33) 453 paddb mm1,mm6 454 paddb mm4,mm6 455 456 movq mm7,mm1 ; transpose coefficients(phase 1) 457 punpcklbw mm1,mm4 ; mm1=(00 01 10 11 20 21 30 31) 458 punpckhbw mm7,mm4 ; mm7=(02 03 12 13 22 23 32 33) 459 460 movq mm0,mm1 ; transpose coefficients(phase 2) 461 punpcklwd mm1,mm7 ; mm1=(00 01 02 03 10 11 12 13) 462 punpckhwd mm0,mm7 ; mm0=(20 21 22 23 30 31 32 33) 463 464 mov edx, JSAMPROW [edi+0*SIZEOF_JSAMPROW] 465 mov esi, JSAMPROW [edi+2*SIZEOF_JSAMPROW] 466 movd DWORD [edx+eax*SIZEOF_JSAMPLE], mm1 467 movd DWORD [esi+eax*SIZEOF_JSAMPLE], mm0 468 469 psrlq mm1,4*BYTE_BIT 470 psrlq mm0,4*BYTE_BIT 471 472 mov edx, JSAMPROW [edi+1*SIZEOF_JSAMPROW] 473 mov esi, JSAMPROW [edi+3*SIZEOF_JSAMPROW] 474 movd DWORD [edx+eax*SIZEOF_JSAMPLE], mm1 475 movd DWORD [esi+eax*SIZEOF_JSAMPLE], mm0 476 477 emms ; empty MMX state 478 479 pop edi 480 pop esi 481 ; pop edx ; need not be preserved 482 ; pop ecx ; need not be preserved 483 poppic ebx 484 mov esp,ebp ; esp <- aligned ebp 485 pop esp ; esp <- original ebp 486 pop ebp 487 ret 488 489 490 ; -------------------------------------------------------------------------- 491 ; 492 ; Perform dequantization and inverse DCT on one block of coefficients, 493 ; producing a reduced-size 2x2 output block. 494 ; 495 ; GLOBAL(void) 496 ; jsimd_idct_2x2_mmx (void * dct_table, JCOEFPTR coef_block, 497 ; JSAMPARRAY output_buf, JDIMENSION output_col) 498 ; 499 500 %define dct_table(b) (b)+8 ; void * dct_table 501 %define coef_block(b) (b)+12 ; JCOEFPTR coef_block 502 %define output_buf(b) (b)+16 ; JSAMPARRAY output_buf 503 %define output_col(b) (b)+20 ; JDIMENSION output_col 504 505 align 16 506 global EXTN(jsimd_idct_2x2_mmx) 507 508 EXTN(jsimd_idct_2x2_mmx): 509 push ebp 510 mov ebp,esp 511 push ebx 512 ; push ecx ; need not be preserved 513 ; push edx ; need not be preserved 514 push esi 515 push edi 516 517 get_GOT ebx ; get GOT address 518 519 ; ---- Pass 1: process columns from input. 520 521 mov edx, POINTER [dct_table(ebp)] ; quantptr 522 mov esi, JCOEFPTR [coef_block(ebp)] ; inptr 523 524 ; | input: | result: | 525 ; | 00 01 ** 03 ** 05 ** 07 | | 526 ; | 10 11 ** 13 ** 15 ** 17 | | 527 ; | ** ** ** ** ** ** ** ** | | 528 ; | 30 31 ** 33 ** 35 ** 37 | A0 A1 A3 A5 A7 | 529 ; | ** ** ** ** ** ** ** ** | B0 B1 B3 B5 B7 | 530 ; | 50 51 ** 53 ** 55 ** 57 | | 531 ; | ** ** ** ** ** ** ** ** | | 532 ; | 70 71 ** 73 ** 75 ** 77 | | 533 534 ; -- Odd part 535 536 movq mm0, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)] 537 movq mm1, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)] 538 pmullw mm0, MMWORD [MMBLOCK(1,0,edx,SIZEOF_ISLOW_MULT_TYPE)] 539 pmullw mm1, MMWORD [MMBLOCK(3,0,edx,SIZEOF_ISLOW_MULT_TYPE)] 540 movq mm2, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)] 541 movq mm3, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)] 542 pmullw mm2, MMWORD [MMBLOCK(5,0,edx,SIZEOF_ISLOW_MULT_TYPE)] 543 pmullw mm3, MMWORD [MMBLOCK(7,0,edx,SIZEOF_ISLOW_MULT_TYPE)] 544 545 ; mm0=(10 11 ** 13), mm1=(30 31 ** 33) 546 ; mm2=(50 51 ** 53), mm3=(70 71 ** 73) 547 548 pcmpeqd mm7,mm7 549 pslld mm7,WORD_BIT ; mm7={0x0000 0xFFFF 0x0000 0xFFFF} 550 551 movq mm4,mm0 ; mm4=(10 11 ** 13) 552 movq mm5,mm2 ; mm5=(50 51 ** 53) 553 punpcklwd mm4,mm1 ; mm4=(10 30 11 31) 554 punpcklwd mm5,mm3 ; mm5=(50 70 51 71) 555 pmaddwd mm4,[GOTOFF(ebx,PW_F362_MF127)] 556 pmaddwd mm5,[GOTOFF(ebx,PW_F085_MF072)] 557 558 psrld mm0,WORD_BIT ; mm0=(11 -- 13 --) 559 pand mm1,mm7 ; mm1=(-- 31 -- 33) 560 psrld mm2,WORD_BIT ; mm2=(51 -- 53 --) 561 pand mm3,mm7 ; mm3=(-- 71 -- 73) 562 por mm0,mm1 ; mm0=(11 31 13 33) 563 por mm2,mm3 ; mm2=(51 71 53 73) 564 pmaddwd mm0,[GOTOFF(ebx,PW_F362_MF127)] 565 pmaddwd mm2,[GOTOFF(ebx,PW_F085_MF072)] 566 567 paddd mm4,mm5 ; mm4=tmp0[col0 col1] 568 569 movq mm6, MMWORD [MMBLOCK(1,1,esi,SIZEOF_JCOEF)] 570 movq mm1, MMWORD [MMBLOCK(3,1,esi,SIZEOF_JCOEF)] 571 pmullw mm6, MMWORD [MMBLOCK(1,1,edx,SIZEOF_ISLOW_MULT_TYPE)] 572 pmullw mm1, MMWORD [MMBLOCK(3,1,edx,SIZEOF_ISLOW_MULT_TYPE)] 573 movq mm3, MMWORD [MMBLOCK(5,1,esi,SIZEOF_JCOEF)] 574 movq mm5, MMWORD [MMBLOCK(7,1,esi,SIZEOF_JCOEF)] 575 pmullw mm3, MMWORD [MMBLOCK(5,1,edx,SIZEOF_ISLOW_MULT_TYPE)] 576 pmullw mm5, MMWORD [MMBLOCK(7,1,edx,SIZEOF_ISLOW_MULT_TYPE)] 577 578 ; mm6=(** 15 ** 17), mm1=(** 35 ** 37) 579 ; mm3=(** 55 ** 57), mm5=(** 75 ** 77) 580 581 psrld mm6,WORD_BIT ; mm6=(15 -- 17 --) 582 pand mm1,mm7 ; mm1=(-- 35 -- 37) 583 psrld mm3,WORD_BIT ; mm3=(55 -- 57 --) 584 pand mm5,mm7 ; mm5=(-- 75 -- 77) 585 por mm6,mm1 ; mm6=(15 35 17 37) 586 por mm3,mm5 ; mm3=(55 75 57 77) 587 pmaddwd mm6,[GOTOFF(ebx,PW_F362_MF127)] 588 pmaddwd mm3,[GOTOFF(ebx,PW_F085_MF072)] 589 590 paddd mm0,mm2 ; mm0=tmp0[col1 col3] 591 paddd mm6,mm3 ; mm6=tmp0[col5 col7] 592 593 ; -- Even part 594 595 movq mm1, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)] 596 movq mm5, MMWORD [MMBLOCK(0,1,esi,SIZEOF_JCOEF)] 597 pmullw mm1, MMWORD [MMBLOCK(0,0,edx,SIZEOF_ISLOW_MULT_TYPE)] 598 pmullw mm5, MMWORD [MMBLOCK(0,1,edx,SIZEOF_ISLOW_MULT_TYPE)] 599 600 ; mm1=(00 01 ** 03), mm5=(** 05 ** 07) 601 602 movq mm2,mm1 ; mm2=(00 01 ** 03) 603 pslld mm1,WORD_BIT ; mm1=(-- 00 -- **) 604 psrad mm1,(WORD_BIT-CONST_BITS-2) ; mm1=tmp10[col0 ****] 605 606 pand mm2,mm7 ; mm2=(-- 01 -- 03) 607 pand mm5,mm7 ; mm5=(-- 05 -- 07) 608 psrad mm2,(WORD_BIT-CONST_BITS-2) ; mm2=tmp10[col1 col3] 609 psrad mm5,(WORD_BIT-CONST_BITS-2) ; mm5=tmp10[col5 col7] 610 611 ; -- Final output stage 612 613 movq mm3,mm1 614 paddd mm1,mm4 ; mm1=data0[col0 ****]=(A0 **) 615 psubd mm3,mm4 ; mm3=data1[col0 ****]=(B0 **) 616 punpckldq mm1,mm3 ; mm1=(A0 B0) 617 618 movq mm7,[GOTOFF(ebx,PD_DESCALE_P1_2)] ; mm7=[PD_DESCALE_P1_2] 619 620 movq mm4,mm2 621 movq mm3,mm5 622 paddd mm2,mm0 ; mm2=data0[col1 col3]=(A1 A3) 623 paddd mm5,mm6 ; mm5=data0[col5 col7]=(A5 A7) 624 psubd mm4,mm0 ; mm4=data1[col1 col3]=(B1 B3) 625 psubd mm3,mm6 ; mm3=data1[col5 col7]=(B5 B7) 626 627 paddd mm1,mm7 628 psrad mm1,DESCALE_P1_2 629 630 paddd mm2,mm7 631 paddd mm5,mm7 632 psrad mm2,DESCALE_P1_2 633 psrad mm5,DESCALE_P1_2 634 paddd mm4,mm7 635 paddd mm3,mm7 636 psrad mm4,DESCALE_P1_2 637 psrad mm3,DESCALE_P1_2 638 639 ; ---- Pass 2: process rows, store into output array. 640 641 mov edi, JSAMPARRAY [output_buf(ebp)] ; (JSAMPROW *) 642 mov eax, JDIMENSION [output_col(ebp)] 643 644 ; | input:| result:| 645 ; | A0 B0 | | 646 ; | A1 B1 | C0 C1 | 647 ; | A3 B3 | D0 D1 | 648 ; | A5 B5 | | 649 ; | A7 B7 | | 650 651 ; -- Odd part 652 653 packssdw mm2,mm4 ; mm2=(A1 A3 B1 B3) 654 packssdw mm5,mm3 ; mm5=(A5 A7 B5 B7) 655 pmaddwd mm2,[GOTOFF(ebx,PW_F362_MF127)] 656 pmaddwd mm5,[GOTOFF(ebx,PW_F085_MF072)] 657 658 paddd mm2,mm5 ; mm2=tmp0[row0 row1] 659 660 ; -- Even part 661 662 pslld mm1,(CONST_BITS+2) ; mm1=tmp10[row0 row1] 663 664 ; -- Final output stage 665 666 movq mm0,[GOTOFF(ebx,PD_DESCALE_P2_2)] ; mm0=[PD_DESCALE_P2_2] 667 668 movq mm6,mm1 669 paddd mm1,mm2 ; mm1=data0[row0 row1]=(C0 C1) 670 psubd mm6,mm2 ; mm6=data1[row0 row1]=(D0 D1) 671 672 paddd mm1,mm0 673 paddd mm6,mm0 674 psrad mm1,DESCALE_P2_2 675 psrad mm6,DESCALE_P2_2 676 677 movq mm7,mm1 ; transpose coefficients 678 punpckldq mm1,mm6 ; mm1=(C0 D0) 679 punpckhdq mm7,mm6 ; mm7=(C1 D1) 680 681 packssdw mm1,mm7 ; mm1=(C0 D0 C1 D1) 682 packsswb mm1,mm1 ; mm1=(C0 D0 C1 D1 C0 D0 C1 D1) 683 paddb mm1,[GOTOFF(ebx,PB_CENTERJSAMP)] 684 685 movd ecx,mm1 686 movd ebx,mm1 ; ebx=(C0 D0 C1 D1) 687 shr ecx,2*BYTE_BIT ; ecx=(C1 D1 -- --) 688 689 mov edx, JSAMPROW [edi+0*SIZEOF_JSAMPROW] 690 mov esi, JSAMPROW [edi+1*SIZEOF_JSAMPROW] 691 mov WORD [edx+eax*SIZEOF_JSAMPLE], bx 692 mov WORD [esi+eax*SIZEOF_JSAMPLE], cx 693 694 emms ; empty MMX state 695 696 pop edi 697 pop esi 698 ; pop edx ; need not be preserved 699 ; pop ecx ; need not be preserved 700 pop ebx 701 pop ebp 702 ret 703 704 ; For some reason, the OS X linker does not honor the request to align the 705 ; segment unless we do this. 706 align 16 707
