1; 2; jidctred.asm - reduced-size IDCT (MMX) 3; 4; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB 5; Copyright (C) 2016, D. R. Commander. 6; 7; Based on the 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%include "jsimdext.inc" 23%include "jdct.inc" 24 25; -------------------------------------------------------------------------- 26 27%define CONST_BITS 13 28%define PASS1_BITS 2 29 30%define DESCALE_P1_4 (CONST_BITS - PASS1_BITS + 1) 31%define DESCALE_P2_4 (CONST_BITS + PASS1_BITS + 3 + 1) 32%define DESCALE_P1_2 (CONST_BITS - PASS1_BITS + 2) 33%define DESCALE_P2_2 (CONST_BITS + PASS1_BITS + 3 + 2) 34 35%if CONST_BITS == 13 36F_0_211 equ 1730 ; FIX(0.211164243) 37F_0_509 equ 4176 ; FIX(0.509795579) 38F_0_601 equ 4926 ; FIX(0.601344887) 39F_0_720 equ 5906 ; FIX(0.720959822) 40F_0_765 equ 6270 ; FIX(0.765366865) 41F_0_850 equ 6967 ; FIX(0.850430095) 42F_0_899 equ 7373 ; FIX(0.899976223) 43F_1_061 equ 8697 ; FIX(1.061594337) 44F_1_272 equ 10426 ; FIX(1.272758580) 45F_1_451 equ 11893 ; FIX(1.451774981) 46F_1_847 equ 15137 ; FIX(1.847759065) 47F_2_172 equ 17799 ; FIX(2.172734803) 48F_2_562 equ 20995 ; FIX(2.562915447) 49F_3_624 equ 29692 ; FIX(3.624509785) 50%else 51; NASM cannot do compile-time arithmetic on floating-point constants. 52%define DESCALE(x, n) (((x) + (1 << ((n) - 1))) >> (n)) 53F_0_211 equ DESCALE( 226735879, 30 - CONST_BITS) ; FIX(0.211164243) 54F_0_509 equ DESCALE( 547388834, 30 - CONST_BITS) ; FIX(0.509795579) 55F_0_601 equ DESCALE( 645689155, 30 - CONST_BITS) ; FIX(0.601344887) 56F_0_720 equ DESCALE( 774124714, 30 - CONST_BITS) ; FIX(0.720959822) 57F_0_765 equ DESCALE( 821806413, 30 - CONST_BITS) ; FIX(0.765366865) 58F_0_850 equ DESCALE( 913142361, 30 - CONST_BITS) ; FIX(0.850430095) 59F_0_899 equ DESCALE( 966342111, 30 - CONST_BITS) ; FIX(0.899976223) 60F_1_061 equ DESCALE(1139878239, 30 - CONST_BITS) ; FIX(1.061594337) 61F_1_272 equ DESCALE(1366614119, 30 - CONST_BITS) ; FIX(1.272758580) 62F_1_451 equ DESCALE(1558831516, 30 - CONST_BITS) ; FIX(1.451774981) 63F_1_847 equ DESCALE(1984016188, 30 - CONST_BITS) ; FIX(1.847759065) 64F_2_172 equ DESCALE(2332956230, 30 - CONST_BITS) ; FIX(2.172734803) 65F_2_562 equ DESCALE(2751909506, 30 - CONST_BITS) ; FIX(2.562915447) 66F_3_624 equ DESCALE(3891787747, 30 - CONST_BITS) ; FIX(3.624509785) 67%endif 68 69; -------------------------------------------------------------------------- 70 SECTION SEG_CONST 71 72 alignz 32 73 GLOBAL_DATA(jconst_idct_red_mmx) 74 75EXTN(jconst_idct_red_mmx): 76 77PW_F184_MF076 times 2 dw F_1_847, -F_0_765 78PW_F256_F089 times 2 dw F_2_562, F_0_899 79PW_F106_MF217 times 2 dw F_1_061, -F_2_172 80PW_MF060_MF050 times 2 dw -F_0_601, -F_0_509 81PW_F145_MF021 times 2 dw F_1_451, -F_0_211 82PW_F362_MF127 times 2 dw F_3_624, -F_1_272 83PW_F085_MF072 times 2 dw F_0_850, -F_0_720 84PD_DESCALE_P1_4 times 2 dd 1 << (DESCALE_P1_4 - 1) 85PD_DESCALE_P2_4 times 2 dd 1 << (DESCALE_P2_4 - 1) 86PD_DESCALE_P1_2 times 2 dd 1 << (DESCALE_P1_2 - 1) 87PD_DESCALE_P2_2 times 2 dd 1 << (DESCALE_P2_2 - 1) 88PB_CENTERJSAMP times 8 db CENTERJSAMPLE 89 90 alignz 32 91 92; -------------------------------------------------------------------------- 93 SECTION SEG_TEXT 94 BITS 32 95; 96; Perform dequantization and inverse DCT on one block of coefficients, 97; producing a reduced-size 4x4 output block. 98; 99; GLOBAL(void) 100; jsimd_idct_4x4_mmx(void *dct_table, JCOEFPTR coef_block, 101; JSAMPARRAY output_buf, JDIMENSION output_col) 102; 103 104%define dct_table(b) (b) + 8 ; void *dct_table 105%define coef_block(b) (b) + 12 ; JCOEFPTR coef_block 106%define output_buf(b) (b) + 16 ; JSAMPARRAY output_buf 107%define output_col(b) (b) + 20 ; JDIMENSION output_col 108 109%define original_ebp ebp + 0 110%define wk(i) ebp - (WK_NUM - (i)) * SIZEOF_MMWORD 111 ; mmword wk[WK_NUM] 112%define WK_NUM 2 113%define workspace wk(0) - DCTSIZE2 * SIZEOF_JCOEF 114 ; JCOEF workspace[DCTSIZE2] 115 116 align 32 117 GLOBAL_FUNCTION(jsimd_idct_4x4_mmx) 118 119EXTN(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; Perform dequantization and inverse DCT on one block of coefficients, 491; producing a reduced-size 2x2 output block. 492; 493; GLOBAL(void) 494; jsimd_idct_2x2_mmx(void *dct_table, JCOEFPTR coef_block, 495; JSAMPARRAY output_buf, JDIMENSION output_col) 496; 497 498%define dct_table(b) (b) + 8 ; void *dct_table 499%define coef_block(b) (b) + 12 ; JCOEFPTR coef_block 500%define output_buf(b) (b) + 16 ; JSAMPARRAY output_buf 501%define output_col(b) (b) + 20 ; JDIMENSION output_col 502 503 align 32 504 GLOBAL_FUNCTION(jsimd_idct_2x2_mmx) 505 506EXTN(jsimd_idct_2x2_mmx): 507 push ebp 508 mov ebp, esp 509 push ebx 510; push ecx ; need not be preserved 511; push edx ; need not be preserved 512 push esi 513 push edi 514 515 get_GOT ebx ; get GOT address 516 517 ; ---- Pass 1: process columns from input. 518 519 mov edx, POINTER [dct_table(ebp)] ; quantptr 520 mov esi, JCOEFPTR [coef_block(ebp)] ; inptr 521 522 ; | input: | result: | 523 ; | 00 01 ** 03 ** 05 ** 07 | | 524 ; | 10 11 ** 13 ** 15 ** 17 | | 525 ; | ** ** ** ** ** ** ** ** | | 526 ; | 30 31 ** 33 ** 35 ** 37 | A0 A1 A3 A5 A7 | 527 ; | ** ** ** ** ** ** ** ** | B0 B1 B3 B5 B7 | 528 ; | 50 51 ** 53 ** 55 ** 57 | | 529 ; | ** ** ** ** ** ** ** ** | | 530 ; | 70 71 ** 73 ** 75 ** 77 | | 531 532 ; -- Odd part 533 534 movq mm0, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)] 535 movq mm1, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)] 536 pmullw mm0, MMWORD [MMBLOCK(1,0,edx,SIZEOF_ISLOW_MULT_TYPE)] 537 pmullw mm1, MMWORD [MMBLOCK(3,0,edx,SIZEOF_ISLOW_MULT_TYPE)] 538 movq mm2, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)] 539 movq mm3, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)] 540 pmullw mm2, MMWORD [MMBLOCK(5,0,edx,SIZEOF_ISLOW_MULT_TYPE)] 541 pmullw mm3, MMWORD [MMBLOCK(7,0,edx,SIZEOF_ISLOW_MULT_TYPE)] 542 543 ; mm0=(10 11 ** 13), mm1=(30 31 ** 33) 544 ; mm2=(50 51 ** 53), mm3=(70 71 ** 73) 545 546 pcmpeqd mm7, mm7 547 pslld mm7, WORD_BIT ; mm7={0x0000 0xFFFF 0x0000 0xFFFF} 548 549 movq mm4, mm0 ; mm4=(10 11 ** 13) 550 movq mm5, mm2 ; mm5=(50 51 ** 53) 551 punpcklwd mm4, mm1 ; mm4=(10 30 11 31) 552 punpcklwd mm5, mm3 ; mm5=(50 70 51 71) 553 pmaddwd mm4, [GOTOFF(ebx,PW_F362_MF127)] 554 pmaddwd mm5, [GOTOFF(ebx,PW_F085_MF072)] 555 556 psrld mm0, WORD_BIT ; mm0=(11 -- 13 --) 557 pand mm1, mm7 ; mm1=(-- 31 -- 33) 558 psrld mm2, WORD_BIT ; mm2=(51 -- 53 --) 559 pand mm3, mm7 ; mm3=(-- 71 -- 73) 560 por mm0, mm1 ; mm0=(11 31 13 33) 561 por mm2, mm3 ; mm2=(51 71 53 73) 562 pmaddwd mm0, [GOTOFF(ebx,PW_F362_MF127)] 563 pmaddwd mm2, [GOTOFF(ebx,PW_F085_MF072)] 564 565 paddd mm4, mm5 ; mm4=tmp0[col0 col1] 566 567 movq mm6, MMWORD [MMBLOCK(1,1,esi,SIZEOF_JCOEF)] 568 movq mm1, MMWORD [MMBLOCK(3,1,esi,SIZEOF_JCOEF)] 569 pmullw mm6, MMWORD [MMBLOCK(1,1,edx,SIZEOF_ISLOW_MULT_TYPE)] 570 pmullw mm1, MMWORD [MMBLOCK(3,1,edx,SIZEOF_ISLOW_MULT_TYPE)] 571 movq mm3, MMWORD [MMBLOCK(5,1,esi,SIZEOF_JCOEF)] 572 movq mm5, MMWORD [MMBLOCK(7,1,esi,SIZEOF_JCOEF)] 573 pmullw mm3, MMWORD [MMBLOCK(5,1,edx,SIZEOF_ISLOW_MULT_TYPE)] 574 pmullw mm5, MMWORD [MMBLOCK(7,1,edx,SIZEOF_ISLOW_MULT_TYPE)] 575 576 ; mm6=(** 15 ** 17), mm1=(** 35 ** 37) 577 ; mm3=(** 55 ** 57), mm5=(** 75 ** 77) 578 579 psrld mm6, WORD_BIT ; mm6=(15 -- 17 --) 580 pand mm1, mm7 ; mm1=(-- 35 -- 37) 581 psrld mm3, WORD_BIT ; mm3=(55 -- 57 --) 582 pand mm5, mm7 ; mm5=(-- 75 -- 77) 583 por mm6, mm1 ; mm6=(15 35 17 37) 584 por mm3, mm5 ; mm3=(55 75 57 77) 585 pmaddwd mm6, [GOTOFF(ebx,PW_F362_MF127)] 586 pmaddwd mm3, [GOTOFF(ebx,PW_F085_MF072)] 587 588 paddd mm0, mm2 ; mm0=tmp0[col1 col3] 589 paddd mm6, mm3 ; mm6=tmp0[col5 col7] 590 591 ; -- Even part 592 593 movq mm1, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)] 594 movq mm5, MMWORD [MMBLOCK(0,1,esi,SIZEOF_JCOEF)] 595 pmullw mm1, MMWORD [MMBLOCK(0,0,edx,SIZEOF_ISLOW_MULT_TYPE)] 596 pmullw mm5, MMWORD [MMBLOCK(0,1,edx,SIZEOF_ISLOW_MULT_TYPE)] 597 598 ; mm1=(00 01 ** 03), mm5=(** 05 ** 07) 599 600 movq mm2, mm1 ; mm2=(00 01 ** 03) 601 pslld mm1, WORD_BIT ; mm1=(-- 00 -- **) 602 psrad mm1, (WORD_BIT-CONST_BITS-2) ; mm1=tmp10[col0 ****] 603 604 pand mm2, mm7 ; mm2=(-- 01 -- 03) 605 pand mm5, mm7 ; mm5=(-- 05 -- 07) 606 psrad mm2, (WORD_BIT-CONST_BITS-2) ; mm2=tmp10[col1 col3] 607 psrad mm5, (WORD_BIT-CONST_BITS-2) ; mm5=tmp10[col5 col7] 608 609 ; -- Final output stage 610 611 movq mm3, mm1 612 paddd mm1, mm4 ; mm1=data0[col0 ****]=(A0 **) 613 psubd mm3, mm4 ; mm3=data1[col0 ****]=(B0 **) 614 punpckldq mm1, mm3 ; mm1=(A0 B0) 615 616 movq mm7, [GOTOFF(ebx,PD_DESCALE_P1_2)] ; mm7=[PD_DESCALE_P1_2] 617 618 movq mm4, mm2 619 movq mm3, mm5 620 paddd mm2, mm0 ; mm2=data0[col1 col3]=(A1 A3) 621 paddd mm5, mm6 ; mm5=data0[col5 col7]=(A5 A7) 622 psubd mm4, mm0 ; mm4=data1[col1 col3]=(B1 B3) 623 psubd mm3, mm6 ; mm3=data1[col5 col7]=(B5 B7) 624 625 paddd mm1, mm7 626 psrad mm1, DESCALE_P1_2 627 628 paddd mm2, mm7 629 paddd mm5, mm7 630 psrad mm2, DESCALE_P1_2 631 psrad mm5, DESCALE_P1_2 632 paddd mm4, mm7 633 paddd mm3, mm7 634 psrad mm4, DESCALE_P1_2 635 psrad mm3, DESCALE_P1_2 636 637 ; ---- Pass 2: process rows, store into output array. 638 639 mov edi, JSAMPARRAY [output_buf(ebp)] ; (JSAMPROW *) 640 mov eax, JDIMENSION [output_col(ebp)] 641 642 ; | input:| result:| 643 ; | A0 B0 | | 644 ; | A1 B1 | C0 C1 | 645 ; | A3 B3 | D0 D1 | 646 ; | A5 B5 | | 647 ; | A7 B7 | | 648 649 ; -- Odd part 650 651 packssdw mm2, mm4 ; mm2=(A1 A3 B1 B3) 652 packssdw mm5, mm3 ; mm5=(A5 A7 B5 B7) 653 pmaddwd mm2, [GOTOFF(ebx,PW_F362_MF127)] 654 pmaddwd mm5, [GOTOFF(ebx,PW_F085_MF072)] 655 656 paddd mm2, mm5 ; mm2=tmp0[row0 row1] 657 658 ; -- Even part 659 660 pslld mm1, (CONST_BITS+2) ; mm1=tmp10[row0 row1] 661 662 ; -- Final output stage 663 664 movq mm0, [GOTOFF(ebx,PD_DESCALE_P2_2)] ; mm0=[PD_DESCALE_P2_2] 665 666 movq mm6, mm1 667 paddd mm1, mm2 ; mm1=data0[row0 row1]=(C0 C1) 668 psubd mm6, mm2 ; mm6=data1[row0 row1]=(D0 D1) 669 670 paddd mm1, mm0 671 paddd mm6, mm0 672 psrad mm1, DESCALE_P2_2 673 psrad mm6, DESCALE_P2_2 674 675 movq mm7, mm1 ; transpose coefficients 676 punpckldq mm1, mm6 ; mm1=(C0 D0) 677 punpckhdq mm7, mm6 ; mm7=(C1 D1) 678 679 packssdw mm1, mm7 ; mm1=(C0 D0 C1 D1) 680 packsswb mm1, mm1 ; mm1=(C0 D0 C1 D1 C0 D0 C1 D1) 681 paddb mm1, [GOTOFF(ebx,PB_CENTERJSAMP)] 682 683 movd ecx, mm1 684 movd ebx, mm1 ; ebx=(C0 D0 C1 D1) 685 shr ecx, 2*BYTE_BIT ; ecx=(C1 D1 -- --) 686 687 mov edx, JSAMPROW [edi+0*SIZEOF_JSAMPROW] 688 mov esi, JSAMPROW [edi+1*SIZEOF_JSAMPROW] 689 mov word [edx+eax*SIZEOF_JSAMPLE], bx 690 mov word [esi+eax*SIZEOF_JSAMPLE], cx 691 692 emms ; empty MMX state 693 694 pop edi 695 pop esi 696; pop edx ; need not be preserved 697; pop ecx ; need not be preserved 698 pop ebx 699 pop ebp 700 ret 701 702; For some reason, the OS X linker does not honor the request to align the 703; segment unless we do this. 704 align 32 705