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