1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
|
;
; jidctred.asm - reduced-size IDCT (MMX)
;
; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
;
; Based on
; x86 SIMD extension for IJG JPEG library
; Copyright (C) 1999-2006, MIYASAKA Masaru.
; For conditions of distribution and use, see copyright notice in jsimdext.inc
;
; This file should be assembled with NASM (Netwide Assembler),
; can *not* be assembled with Microsoft's MASM or any compatible
; assembler (including Borland's Turbo Assembler).
; NASM is available from http://nasm.sourceforge.net/ or
; http://sourceforge.net/project/showfiles.php?group_id=6208
;
; This file contains inverse-DCT routines that produce reduced-size
; output: either 4x4 or 2x2 pixels from an 8x8 DCT block.
; The following code is based directly on the IJG's original jidctred.c;
; see the jidctred.c for more details.
;
; [TAB8]
%include "jsimdext.inc"
%include "jdct.inc"
; --------------------------------------------------------------------------
%define CONST_BITS 13
%define PASS1_BITS 2
%define DESCALE_P1_4 (CONST_BITS-PASS1_BITS+1)
%define DESCALE_P2_4 (CONST_BITS+PASS1_BITS+3+1)
%define DESCALE_P1_2 (CONST_BITS-PASS1_BITS+2)
%define DESCALE_P2_2 (CONST_BITS+PASS1_BITS+3+2)
%if CONST_BITS == 13
F_0_211 equ 1730 ; FIX(0.211164243)
F_0_509 equ 4176 ; FIX(0.509795579)
F_0_601 equ 4926 ; FIX(0.601344887)
F_0_720 equ 5906 ; FIX(0.720959822)
F_0_765 equ 6270 ; FIX(0.765366865)
F_0_850 equ 6967 ; FIX(0.850430095)
F_0_899 equ 7373 ; FIX(0.899976223)
F_1_061 equ 8697 ; FIX(1.061594337)
F_1_272 equ 10426 ; FIX(1.272758580)
F_1_451 equ 11893 ; FIX(1.451774981)
F_1_847 equ 15137 ; FIX(1.847759065)
F_2_172 equ 17799 ; FIX(2.172734803)
F_2_562 equ 20995 ; FIX(2.562915447)
F_3_624 equ 29692 ; FIX(3.624509785)
%else
; NASM cannot do compile-time arithmetic on floating-point constants.
%define DESCALE(x,n) (((x)+(1<<((n)-1)))>>(n))
F_0_211 equ DESCALE( 226735879,30-CONST_BITS) ; FIX(0.211164243)
F_0_509 equ DESCALE( 547388834,30-CONST_BITS) ; FIX(0.509795579)
F_0_601 equ DESCALE( 645689155,30-CONST_BITS) ; FIX(0.601344887)
F_0_720 equ DESCALE( 774124714,30-CONST_BITS) ; FIX(0.720959822)
F_0_765 equ DESCALE( 821806413,30-CONST_BITS) ; FIX(0.765366865)
F_0_850 equ DESCALE( 913142361,30-CONST_BITS) ; FIX(0.850430095)
F_0_899 equ DESCALE( 966342111,30-CONST_BITS) ; FIX(0.899976223)
F_1_061 equ DESCALE(1139878239,30-CONST_BITS) ; FIX(1.061594337)
F_1_272 equ DESCALE(1366614119,30-CONST_BITS) ; FIX(1.272758580)
F_1_451 equ DESCALE(1558831516,30-CONST_BITS) ; FIX(1.451774981)
F_1_847 equ DESCALE(1984016188,30-CONST_BITS) ; FIX(1.847759065)
F_2_172 equ DESCALE(2332956230,30-CONST_BITS) ; FIX(2.172734803)
F_2_562 equ DESCALE(2751909506,30-CONST_BITS) ; FIX(2.562915447)
F_3_624 equ DESCALE(3891787747,30-CONST_BITS) ; FIX(3.624509785)
%endif
; --------------------------------------------------------------------------
SECTION SEG_CONST
alignz 16
global EXTN(jconst_idct_red_mmx)
EXTN(jconst_idct_red_mmx):
PW_F184_MF076 times 2 dw F_1_847,-F_0_765
PW_F256_F089 times 2 dw F_2_562, F_0_899
PW_F106_MF217 times 2 dw F_1_061,-F_2_172
PW_MF060_MF050 times 2 dw -F_0_601,-F_0_509
PW_F145_MF021 times 2 dw F_1_451,-F_0_211
PW_F362_MF127 times 2 dw F_3_624,-F_1_272
PW_F085_MF072 times 2 dw F_0_850,-F_0_720
PD_DESCALE_P1_4 times 2 dd 1 << (DESCALE_P1_4-1)
PD_DESCALE_P2_4 times 2 dd 1 << (DESCALE_P2_4-1)
PD_DESCALE_P1_2 times 2 dd 1 << (DESCALE_P1_2-1)
PD_DESCALE_P2_2 times 2 dd 1 << (DESCALE_P2_2-1)
PB_CENTERJSAMP times 8 db CENTERJSAMPLE
alignz 16
; --------------------------------------------------------------------------
SECTION SEG_TEXT
BITS 32
;
; Perform dequantization and inverse DCT on one block of coefficients,
; producing a reduced-size 4x4 output block.
;
; GLOBAL(void)
; jsimd_idct_4x4_mmx (void * dct_table, JCOEFPTR coef_block,
; JSAMPARRAY output_buf, JDIMENSION output_col)
;
%define dct_table(b) (b)+8 ; void * dct_table
%define coef_block(b) (b)+12 ; JCOEFPTR coef_block
%define output_buf(b) (b)+16 ; JSAMPARRAY output_buf
%define output_col(b) (b)+20 ; JDIMENSION output_col
%define original_ebp ebp+0
%define wk(i) ebp-(WK_NUM-(i))*SIZEOF_MMWORD ; mmword wk[WK_NUM]
%define WK_NUM 2
%define workspace wk(0)-DCTSIZE2*SIZEOF_JCOEF
; JCOEF workspace[DCTSIZE2]
align 16
global EXTN(jsimd_idct_4x4_mmx)
EXTN(jsimd_idct_4x4_mmx):
push ebp
mov eax,esp ; eax = original ebp
sub esp, byte 4
and esp, byte (-SIZEOF_MMWORD) ; align to 64 bits
mov [esp],eax
mov ebp,esp ; ebp = aligned ebp
lea esp, [workspace]
pushpic ebx
; push ecx ; need not be preserved
; push edx ; need not be preserved
push esi
push edi
get_GOT ebx ; get GOT address
; ---- Pass 1: process columns from input, store into work array.
; mov eax, [original_ebp]
mov edx, POINTER [dct_table(eax)] ; quantptr
mov esi, JCOEFPTR [coef_block(eax)] ; inptr
lea edi, [workspace] ; JCOEF * wsptr
mov ecx, DCTSIZE/4 ; ctr
alignx 16,7
.columnloop:
%ifndef NO_ZERO_COLUMN_TEST_4X4_MMX
mov eax, DWORD [DWBLOCK(1,0,esi,SIZEOF_JCOEF)]
or eax, DWORD [DWBLOCK(2,0,esi,SIZEOF_JCOEF)]
jnz short .columnDCT
movq mm0, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)]
movq mm1, MMWORD [MMBLOCK(2,0,esi,SIZEOF_JCOEF)]
por mm0, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)]
por mm1, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)]
por mm0, MMWORD [MMBLOCK(6,0,esi,SIZEOF_JCOEF)]
por mm1, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)]
por mm0,mm1
packsswb mm0,mm0
movd eax,mm0
test eax,eax
jnz short .columnDCT
; -- AC terms all zero
movq mm0, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)]
pmullw mm0, MMWORD [MMBLOCK(0,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
psllw mm0,PASS1_BITS
movq mm2,mm0 ; mm0=in0=(00 01 02 03)
punpcklwd mm0,mm0 ; mm0=(00 00 01 01)
punpckhwd mm2,mm2 ; mm2=(02 02 03 03)
movq mm1,mm0
punpckldq mm0,mm0 ; mm0=(00 00 00 00)
punpckhdq mm1,mm1 ; mm1=(01 01 01 01)
movq mm3,mm2
punpckldq mm2,mm2 ; mm2=(02 02 02 02)
punpckhdq mm3,mm3 ; mm3=(03 03 03 03)
movq MMWORD [MMBLOCK(0,0,edi,SIZEOF_JCOEF)], mm0
movq MMWORD [MMBLOCK(1,0,edi,SIZEOF_JCOEF)], mm1
movq MMWORD [MMBLOCK(2,0,edi,SIZEOF_JCOEF)], mm2
movq MMWORD [MMBLOCK(3,0,edi,SIZEOF_JCOEF)], mm3
jmp near .nextcolumn
alignx 16,7
%endif
.columnDCT:
; -- Odd part
movq mm0, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)]
movq mm1, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)]
pmullw mm0, MMWORD [MMBLOCK(1,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
pmullw mm1, MMWORD [MMBLOCK(3,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
movq mm2, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)]
movq mm3, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)]
pmullw mm2, MMWORD [MMBLOCK(5,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
pmullw mm3, MMWORD [MMBLOCK(7,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
movq mm4,mm0
movq mm5,mm0
punpcklwd mm4,mm1
punpckhwd mm5,mm1
movq mm0,mm4
movq mm1,mm5
pmaddwd mm4,[GOTOFF(ebx,PW_F256_F089)] ; mm4=(tmp2L)
pmaddwd mm5,[GOTOFF(ebx,PW_F256_F089)] ; mm5=(tmp2H)
pmaddwd mm0,[GOTOFF(ebx,PW_F106_MF217)] ; mm0=(tmp0L)
pmaddwd mm1,[GOTOFF(ebx,PW_F106_MF217)] ; mm1=(tmp0H)
movq mm6,mm2
movq mm7,mm2
punpcklwd mm6,mm3
punpckhwd mm7,mm3
movq mm2,mm6
movq mm3,mm7
pmaddwd mm6,[GOTOFF(ebx,PW_MF060_MF050)] ; mm6=(tmp2L)
pmaddwd mm7,[GOTOFF(ebx,PW_MF060_MF050)] ; mm7=(tmp2H)
pmaddwd mm2,[GOTOFF(ebx,PW_F145_MF021)] ; mm2=(tmp0L)
pmaddwd mm3,[GOTOFF(ebx,PW_F145_MF021)] ; mm3=(tmp0H)
paddd mm6,mm4 ; mm6=tmp2L
paddd mm7,mm5 ; mm7=tmp2H
paddd mm2,mm0 ; mm2=tmp0L
paddd mm3,mm1 ; mm3=tmp0H
movq MMWORD [wk(0)], mm2 ; wk(0)=tmp0L
movq MMWORD [wk(1)], mm3 ; wk(1)=tmp0H
; -- Even part
movq mm4, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)]
movq mm5, MMWORD [MMBLOCK(2,0,esi,SIZEOF_JCOEF)]
movq mm0, MMWORD [MMBLOCK(6,0,esi,SIZEOF_JCOEF)]
pmullw mm4, MMWORD [MMBLOCK(0,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
pmullw mm5, MMWORD [MMBLOCK(2,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
pmullw mm0, MMWORD [MMBLOCK(6,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
pxor mm1,mm1
pxor mm2,mm2
punpcklwd mm1,mm4 ; mm1=tmp0L
punpckhwd mm2,mm4 ; mm2=tmp0H
psrad mm1,(16-CONST_BITS-1) ; psrad mm1,16 & pslld mm1,CONST_BITS+1
psrad mm2,(16-CONST_BITS-1) ; psrad mm2,16 & pslld mm2,CONST_BITS+1
movq mm3,mm5 ; mm5=in2=z2
punpcklwd mm5,mm0 ; mm0=in6=z3
punpckhwd mm3,mm0
pmaddwd mm5,[GOTOFF(ebx,PW_F184_MF076)] ; mm5=tmp2L
pmaddwd mm3,[GOTOFF(ebx,PW_F184_MF076)] ; mm3=tmp2H
movq mm4,mm1
movq mm0,mm2
paddd mm1,mm5 ; mm1=tmp10L
paddd mm2,mm3 ; mm2=tmp10H
psubd mm4,mm5 ; mm4=tmp12L
psubd mm0,mm3 ; mm0=tmp12H
; -- Final output stage
movq mm5,mm1
movq mm3,mm2
paddd mm1,mm6 ; mm1=data0L
paddd mm2,mm7 ; mm2=data0H
psubd mm5,mm6 ; mm5=data3L
psubd mm3,mm7 ; mm3=data3H
movq mm6,[GOTOFF(ebx,PD_DESCALE_P1_4)] ; mm6=[PD_DESCALE_P1_4]
paddd mm1,mm6
paddd mm2,mm6
psrad mm1,DESCALE_P1_4
psrad mm2,DESCALE_P1_4
paddd mm5,mm6
paddd mm3,mm6
psrad mm5,DESCALE_P1_4
psrad mm3,DESCALE_P1_4
packssdw mm1,mm2 ; mm1=data0=(00 01 02 03)
packssdw mm5,mm3 ; mm5=data3=(30 31 32 33)
movq mm7, MMWORD [wk(0)] ; mm7=tmp0L
movq mm6, MMWORD [wk(1)] ; mm6=tmp0H
movq mm2,mm4
movq mm3,mm0
paddd mm4,mm7 ; mm4=data1L
paddd mm0,mm6 ; mm0=data1H
psubd mm2,mm7 ; mm2=data2L
psubd mm3,mm6 ; mm3=data2H
movq mm7,[GOTOFF(ebx,PD_DESCALE_P1_4)] ; mm7=[PD_DESCALE_P1_4]
paddd mm4,mm7
paddd mm0,mm7
psrad mm4,DESCALE_P1_4
psrad mm0,DESCALE_P1_4
paddd mm2,mm7
paddd mm3,mm7
psrad mm2,DESCALE_P1_4
psrad mm3,DESCALE_P1_4
packssdw mm4,mm0 ; mm4=data1=(10 11 12 13)
packssdw mm2,mm3 ; mm2=data2=(20 21 22 23)
movq mm6,mm1 ; transpose coefficients(phase 1)
punpcklwd mm1,mm4 ; mm1=(00 10 01 11)
punpckhwd mm6,mm4 ; mm6=(02 12 03 13)
movq mm7,mm2 ; transpose coefficients(phase 1)
punpcklwd mm2,mm5 ; mm2=(20 30 21 31)
punpckhwd mm7,mm5 ; mm7=(22 32 23 33)
movq mm0,mm1 ; transpose coefficients(phase 2)
punpckldq mm1,mm2 ; mm1=(00 10 20 30)
punpckhdq mm0,mm2 ; mm0=(01 11 21 31)
movq mm3,mm6 ; transpose coefficients(phase 2)
punpckldq mm6,mm7 ; mm6=(02 12 22 32)
punpckhdq mm3,mm7 ; mm3=(03 13 23 33)
movq MMWORD [MMBLOCK(0,0,edi,SIZEOF_JCOEF)], mm1
movq MMWORD [MMBLOCK(1,0,edi,SIZEOF_JCOEF)], mm0
movq MMWORD [MMBLOCK(2,0,edi,SIZEOF_JCOEF)], mm6
movq MMWORD [MMBLOCK(3,0,edi,SIZEOF_JCOEF)], mm3
.nextcolumn:
add esi, byte 4*SIZEOF_JCOEF ; coef_block
add edx, byte 4*SIZEOF_ISLOW_MULT_TYPE ; quantptr
add edi, byte 4*DCTSIZE*SIZEOF_JCOEF ; wsptr
dec ecx ; ctr
jnz near .columnloop
; ---- Pass 2: process rows from work array, store into output array.
mov eax, [original_ebp]
lea esi, [workspace] ; JCOEF * wsptr
mov edi, JSAMPARRAY [output_buf(eax)] ; (JSAMPROW *)
mov eax, JDIMENSION [output_col(eax)]
; -- Odd part
movq mm0, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)]
movq mm1, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)]
movq mm2, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)]
movq mm3, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)]
movq mm4,mm0
movq mm5,mm0
punpcklwd mm4,mm1
punpckhwd mm5,mm1
movq mm0,mm4
movq mm1,mm5
pmaddwd mm4,[GOTOFF(ebx,PW_F256_F089)] ; mm4=(tmp2L)
pmaddwd mm5,[GOTOFF(ebx,PW_F256_F089)] ; mm5=(tmp2H)
pmaddwd mm0,[GOTOFF(ebx,PW_F106_MF217)] ; mm0=(tmp0L)
pmaddwd mm1,[GOTOFF(ebx,PW_F106_MF217)] ; mm1=(tmp0H)
movq mm6,mm2
movq mm7,mm2
punpcklwd mm6,mm3
punpckhwd mm7,mm3
movq mm2,mm6
movq mm3,mm7
pmaddwd mm6,[GOTOFF(ebx,PW_MF060_MF050)] ; mm6=(tmp2L)
pmaddwd mm7,[GOTOFF(ebx,PW_MF060_MF050)] ; mm7=(tmp2H)
pmaddwd mm2,[GOTOFF(ebx,PW_F145_MF021)] ; mm2=(tmp0L)
pmaddwd mm3,[GOTOFF(ebx,PW_F145_MF021)] ; mm3=(tmp0H)
paddd mm6,mm4 ; mm6=tmp2L
paddd mm7,mm5 ; mm7=tmp2H
paddd mm2,mm0 ; mm2=tmp0L
paddd mm3,mm1 ; mm3=tmp0H
movq MMWORD [wk(0)], mm2 ; wk(0)=tmp0L
movq MMWORD [wk(1)], mm3 ; wk(1)=tmp0H
; -- Even part
movq mm4, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)]
movq mm5, MMWORD [MMBLOCK(2,0,esi,SIZEOF_JCOEF)]
movq mm0, MMWORD [MMBLOCK(6,0,esi,SIZEOF_JCOEF)]
pxor mm1,mm1
pxor mm2,mm2
punpcklwd mm1,mm4 ; mm1=tmp0L
punpckhwd mm2,mm4 ; mm2=tmp0H
psrad mm1,(16-CONST_BITS-1) ; psrad mm1,16 & pslld mm1,CONST_BITS+1
psrad mm2,(16-CONST_BITS-1) ; psrad mm2,16 & pslld mm2,CONST_BITS+1
movq mm3,mm5 ; mm5=in2=z2
punpcklwd mm5,mm0 ; mm0=in6=z3
punpckhwd mm3,mm0
pmaddwd mm5,[GOTOFF(ebx,PW_F184_MF076)] ; mm5=tmp2L
pmaddwd mm3,[GOTOFF(ebx,PW_F184_MF076)] ; mm3=tmp2H
movq mm4,mm1
movq mm0,mm2
paddd mm1,mm5 ; mm1=tmp10L
paddd mm2,mm3 ; mm2=tmp10H
psubd mm4,mm5 ; mm4=tmp12L
psubd mm0,mm3 ; mm0=tmp12H
; -- Final output stage
movq mm5,mm1
movq mm3,mm2
paddd mm1,mm6 ; mm1=data0L
paddd mm2,mm7 ; mm2=data0H
psubd mm5,mm6 ; mm5=data3L
psubd mm3,mm7 ; mm3=data3H
movq mm6,[GOTOFF(ebx,PD_DESCALE_P2_4)] ; mm6=[PD_DESCALE_P2_4]
paddd mm1,mm6
paddd mm2,mm6
psrad mm1,DESCALE_P2_4
psrad mm2,DESCALE_P2_4
paddd mm5,mm6
paddd mm3,mm6
psrad mm5,DESCALE_P2_4
psrad mm3,DESCALE_P2_4
packssdw mm1,mm2 ; mm1=data0=(00 10 20 30)
packssdw mm5,mm3 ; mm5=data3=(03 13 23 33)
movq mm7, MMWORD [wk(0)] ; mm7=tmp0L
movq mm6, MMWORD [wk(1)] ; mm6=tmp0H
movq mm2,mm4
movq mm3,mm0
paddd mm4,mm7 ; mm4=data1L
paddd mm0,mm6 ; mm0=data1H
psubd mm2,mm7 ; mm2=data2L
psubd mm3,mm6 ; mm3=data2H
movq mm7,[GOTOFF(ebx,PD_DESCALE_P2_4)] ; mm7=[PD_DESCALE_P2_4]
paddd mm4,mm7
paddd mm0,mm7
psrad mm4,DESCALE_P2_4
psrad mm0,DESCALE_P2_4
paddd mm2,mm7
paddd mm3,mm7
psrad mm2,DESCALE_P2_4
psrad mm3,DESCALE_P2_4
packssdw mm4,mm0 ; mm4=data1=(01 11 21 31)
packssdw mm2,mm3 ; mm2=data2=(02 12 22 32)
movq mm6,[GOTOFF(ebx,PB_CENTERJSAMP)] ; mm6=[PB_CENTERJSAMP]
packsswb mm1,mm2 ; mm1=(00 10 20 30 02 12 22 32)
packsswb mm4,mm5 ; mm4=(01 11 21 31 03 13 23 33)
paddb mm1,mm6
paddb mm4,mm6
movq mm7,mm1 ; transpose coefficients(phase 1)
punpcklbw mm1,mm4 ; mm1=(00 01 10 11 20 21 30 31)
punpckhbw mm7,mm4 ; mm7=(02 03 12 13 22 23 32 33)
movq mm0,mm1 ; transpose coefficients(phase 2)
punpcklwd mm1,mm7 ; mm1=(00 01 02 03 10 11 12 13)
punpckhwd mm0,mm7 ; mm0=(20 21 22 23 30 31 32 33)
mov edx, JSAMPROW [edi+0*SIZEOF_JSAMPROW]
mov esi, JSAMPROW [edi+2*SIZEOF_JSAMPROW]
movd DWORD [edx+eax*SIZEOF_JSAMPLE], mm1
movd DWORD [esi+eax*SIZEOF_JSAMPLE], mm0
psrlq mm1,4*BYTE_BIT
psrlq mm0,4*BYTE_BIT
mov edx, JSAMPROW [edi+1*SIZEOF_JSAMPROW]
mov esi, JSAMPROW [edi+3*SIZEOF_JSAMPROW]
movd DWORD [edx+eax*SIZEOF_JSAMPLE], mm1
movd DWORD [esi+eax*SIZEOF_JSAMPLE], mm0
emms ; empty MMX state
pop edi
pop esi
; pop edx ; need not be preserved
; pop ecx ; need not be preserved
poppic ebx
mov esp,ebp ; esp <- aligned ebp
pop esp ; esp <- original ebp
pop ebp
ret
; --------------------------------------------------------------------------
;
; Perform dequantization and inverse DCT on one block of coefficients,
; producing a reduced-size 2x2 output block.
;
; GLOBAL(void)
; jsimd_idct_2x2_mmx (void * dct_table, JCOEFPTR coef_block,
; JSAMPARRAY output_buf, JDIMENSION output_col)
;
%define dct_table(b) (b)+8 ; void * dct_table
%define coef_block(b) (b)+12 ; JCOEFPTR coef_block
%define output_buf(b) (b)+16 ; JSAMPARRAY output_buf
%define output_col(b) (b)+20 ; JDIMENSION output_col
align 16
global EXTN(jsimd_idct_2x2_mmx)
EXTN(jsimd_idct_2x2_mmx):
push ebp
mov ebp,esp
push ebx
; push ecx ; need not be preserved
; push edx ; need not be preserved
push esi
push edi
get_GOT ebx ; get GOT address
; ---- Pass 1: process columns from input.
mov edx, POINTER [dct_table(ebp)] ; quantptr
mov esi, JCOEFPTR [coef_block(ebp)] ; inptr
; | input: | result: |
; | 00 01 ** 03 ** 05 ** 07 | |
; | 10 11 ** 13 ** 15 ** 17 | |
; | ** ** ** ** ** ** ** ** | |
; | 30 31 ** 33 ** 35 ** 37 | A0 A1 A3 A5 A7 |
; | ** ** ** ** ** ** ** ** | B0 B1 B3 B5 B7 |
; | 50 51 ** 53 ** 55 ** 57 | |
; | ** ** ** ** ** ** ** ** | |
; | 70 71 ** 73 ** 75 ** 77 | |
; -- Odd part
movq mm0, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)]
movq mm1, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)]
pmullw mm0, MMWORD [MMBLOCK(1,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
pmullw mm1, MMWORD [MMBLOCK(3,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
movq mm2, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)]
movq mm3, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)]
pmullw mm2, MMWORD [MMBLOCK(5,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
pmullw mm3, MMWORD [MMBLOCK(7,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
; mm0=(10 11 ** 13), mm1=(30 31 ** 33)
; mm2=(50 51 ** 53), mm3=(70 71 ** 73)
pcmpeqd mm7,mm7
pslld mm7,WORD_BIT ; mm7={0x0000 0xFFFF 0x0000 0xFFFF}
movq mm4,mm0 ; mm4=(10 11 ** 13)
movq mm5,mm2 ; mm5=(50 51 ** 53)
punpcklwd mm4,mm1 ; mm4=(10 30 11 31)
punpcklwd mm5,mm3 ; mm5=(50 70 51 71)
pmaddwd mm4,[GOTOFF(ebx,PW_F362_MF127)]
pmaddwd mm5,[GOTOFF(ebx,PW_F085_MF072)]
psrld mm0,WORD_BIT ; mm0=(11 -- 13 --)
pand mm1,mm7 ; mm1=(-- 31 -- 33)
psrld mm2,WORD_BIT ; mm2=(51 -- 53 --)
pand mm3,mm7 ; mm3=(-- 71 -- 73)
por mm0,mm1 ; mm0=(11 31 13 33)
por mm2,mm3 ; mm2=(51 71 53 73)
pmaddwd mm0,[GOTOFF(ebx,PW_F362_MF127)]
pmaddwd mm2,[GOTOFF(ebx,PW_F085_MF072)]
paddd mm4,mm5 ; mm4=tmp0[col0 col1]
movq mm6, MMWORD [MMBLOCK(1,1,esi,SIZEOF_JCOEF)]
movq mm1, MMWORD [MMBLOCK(3,1,esi,SIZEOF_JCOEF)]
pmullw mm6, MMWORD [MMBLOCK(1,1,edx,SIZEOF_ISLOW_MULT_TYPE)]
pmullw mm1, MMWORD [MMBLOCK(3,1,edx,SIZEOF_ISLOW_MULT_TYPE)]
movq mm3, MMWORD [MMBLOCK(5,1,esi,SIZEOF_JCOEF)]
movq mm5, MMWORD [MMBLOCK(7,1,esi,SIZEOF_JCOEF)]
pmullw mm3, MMWORD [MMBLOCK(5,1,edx,SIZEOF_ISLOW_MULT_TYPE)]
pmullw mm5, MMWORD [MMBLOCK(7,1,edx,SIZEOF_ISLOW_MULT_TYPE)]
; mm6=(** 15 ** 17), mm1=(** 35 ** 37)
; mm3=(** 55 ** 57), mm5=(** 75 ** 77)
psrld mm6,WORD_BIT ; mm6=(15 -- 17 --)
pand mm1,mm7 ; mm1=(-- 35 -- 37)
psrld mm3,WORD_BIT ; mm3=(55 -- 57 --)
pand mm5,mm7 ; mm5=(-- 75 -- 77)
por mm6,mm1 ; mm6=(15 35 17 37)
por mm3,mm5 ; mm3=(55 75 57 77)
pmaddwd mm6,[GOTOFF(ebx,PW_F362_MF127)]
pmaddwd mm3,[GOTOFF(ebx,PW_F085_MF072)]
paddd mm0,mm2 ; mm0=tmp0[col1 col3]
paddd mm6,mm3 ; mm6=tmp0[col5 col7]
; -- Even part
movq mm1, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)]
movq mm5, MMWORD [MMBLOCK(0,1,esi,SIZEOF_JCOEF)]
pmullw mm1, MMWORD [MMBLOCK(0,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
pmullw mm5, MMWORD [MMBLOCK(0,1,edx,SIZEOF_ISLOW_MULT_TYPE)]
; mm1=(00 01 ** 03), mm5=(** 05 ** 07)
movq mm2,mm1 ; mm2=(00 01 ** 03)
pslld mm1,WORD_BIT ; mm1=(-- 00 -- **)
psrad mm1,(WORD_BIT-CONST_BITS-2) ; mm1=tmp10[col0 ****]
pand mm2,mm7 ; mm2=(-- 01 -- 03)
pand mm5,mm7 ; mm5=(-- 05 -- 07)
psrad mm2,(WORD_BIT-CONST_BITS-2) ; mm2=tmp10[col1 col3]
psrad mm5,(WORD_BIT-CONST_BITS-2) ; mm5=tmp10[col5 col7]
; -- Final output stage
movq mm3,mm1
paddd mm1,mm4 ; mm1=data0[col0 ****]=(A0 **)
psubd mm3,mm4 ; mm3=data1[col0 ****]=(B0 **)
punpckldq mm1,mm3 ; mm1=(A0 B0)
movq mm7,[GOTOFF(ebx,PD_DESCALE_P1_2)] ; mm7=[PD_DESCALE_P1_2]
movq mm4,mm2
movq mm3,mm5
paddd mm2,mm0 ; mm2=data0[col1 col3]=(A1 A3)
paddd mm5,mm6 ; mm5=data0[col5 col7]=(A5 A7)
psubd mm4,mm0 ; mm4=data1[col1 col3]=(B1 B3)
psubd mm3,mm6 ; mm3=data1[col5 col7]=(B5 B7)
paddd mm1,mm7
psrad mm1,DESCALE_P1_2
paddd mm2,mm7
paddd mm5,mm7
psrad mm2,DESCALE_P1_2
psrad mm5,DESCALE_P1_2
paddd mm4,mm7
paddd mm3,mm7
psrad mm4,DESCALE_P1_2
psrad mm3,DESCALE_P1_2
; ---- Pass 2: process rows, store into output array.
mov edi, JSAMPARRAY [output_buf(ebp)] ; (JSAMPROW *)
mov eax, JDIMENSION [output_col(ebp)]
; | input:| result:|
; | A0 B0 | |
; | A1 B1 | C0 C1 |
; | A3 B3 | D0 D1 |
; | A5 B5 | |
; | A7 B7 | |
; -- Odd part
packssdw mm2,mm4 ; mm2=(A1 A3 B1 B3)
packssdw mm5,mm3 ; mm5=(A5 A7 B5 B7)
pmaddwd mm2,[GOTOFF(ebx,PW_F362_MF127)]
pmaddwd mm5,[GOTOFF(ebx,PW_F085_MF072)]
paddd mm2,mm5 ; mm2=tmp0[row0 row1]
; -- Even part
pslld mm1,(CONST_BITS+2) ; mm1=tmp10[row0 row1]
; -- Final output stage
movq mm0,[GOTOFF(ebx,PD_DESCALE_P2_2)] ; mm0=[PD_DESCALE_P2_2]
movq mm6,mm1
paddd mm1,mm2 ; mm1=data0[row0 row1]=(C0 C1)
psubd mm6,mm2 ; mm6=data1[row0 row1]=(D0 D1)
paddd mm1,mm0
paddd mm6,mm0
psrad mm1,DESCALE_P2_2
psrad mm6,DESCALE_P2_2
movq mm7,mm1 ; transpose coefficients
punpckldq mm1,mm6 ; mm1=(C0 D0)
punpckhdq mm7,mm6 ; mm7=(C1 D1)
packssdw mm1,mm7 ; mm1=(C0 D0 C1 D1)
packsswb mm1,mm1 ; mm1=(C0 D0 C1 D1 C0 D0 C1 D1)
paddb mm1,[GOTOFF(ebx,PB_CENTERJSAMP)]
movd ecx,mm1
movd ebx,mm1 ; ebx=(C0 D0 C1 D1)
shr ecx,2*BYTE_BIT ; ecx=(C1 D1 -- --)
mov edx, JSAMPROW [edi+0*SIZEOF_JSAMPROW]
mov esi, JSAMPROW [edi+1*SIZEOF_JSAMPROW]
mov WORD [edx+eax*SIZEOF_JSAMPLE], bx
mov WORD [esi+eax*SIZEOF_JSAMPLE], cx
emms ; empty MMX state
pop edi
pop esi
; pop edx ; need not be preserved
; pop ecx ; need not be preserved
pop ebx
pop ebp
ret
; For some reason, the OS X linker does not honor the request to align the
; segment unless we do this.
align 16
|
