summaryrefslogtreecommitdiff
path: root/media/libjpeg/simd/jfdctint-mmx.asm
blob: 9142ad8816e1e3bfd3cbaf7baeb0319cb7c6d4d1 (plain)
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
;
; jfdctint.asm - accurate integer FDCT (MMX)
;
; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
;
; Based on the 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 a slow-but-accurate integer implementation of the
; forward DCT (Discrete Cosine Transform). The following code is based
; directly on the IJG's original jfdctint.c; see the jfdctint.c for
; more details.
;
; [TAB8]

%include "jsimdext.inc"
%include "jdct.inc"

; --------------------------------------------------------------------------

%define CONST_BITS      13
%define PASS1_BITS      2

%define DESCALE_P1      (CONST_BITS-PASS1_BITS)
%define DESCALE_P2      (CONST_BITS+PASS1_BITS)

%if CONST_BITS == 13
F_0_298 equ      2446           ; FIX(0.298631336)
F_0_390 equ      3196           ; FIX(0.390180644)
F_0_541 equ      4433           ; FIX(0.541196100)
F_0_765 equ      6270           ; FIX(0.765366865)
F_0_899 equ      7373           ; FIX(0.899976223)
F_1_175 equ      9633           ; FIX(1.175875602)
F_1_501 equ     12299           ; FIX(1.501321110)
F_1_847 equ     15137           ; FIX(1.847759065)
F_1_961 equ     16069           ; FIX(1.961570560)
F_2_053 equ     16819           ; FIX(2.053119869)
F_2_562 equ     20995           ; FIX(2.562915447)
F_3_072 equ     25172           ; FIX(3.072711026)
%else
; NASM cannot do compile-time arithmetic on floating-point constants.
%define DESCALE(x,n)  (((x)+(1<<((n)-1)))>>(n))
F_0_298 equ     DESCALE( 320652955,30-CONST_BITS)       ; FIX(0.298631336)
F_0_390 equ     DESCALE( 418953276,30-CONST_BITS)       ; FIX(0.390180644)
F_0_541 equ     DESCALE( 581104887,30-CONST_BITS)       ; FIX(0.541196100)
F_0_765 equ     DESCALE( 821806413,30-CONST_BITS)       ; FIX(0.765366865)
F_0_899 equ     DESCALE( 966342111,30-CONST_BITS)       ; FIX(0.899976223)
F_1_175 equ     DESCALE(1262586813,30-CONST_BITS)       ; FIX(1.175875602)
F_1_501 equ     DESCALE(1612031267,30-CONST_BITS)       ; FIX(1.501321110)
F_1_847 equ     DESCALE(1984016188,30-CONST_BITS)       ; FIX(1.847759065)
F_1_961 equ     DESCALE(2106220350,30-CONST_BITS)       ; FIX(1.961570560)
F_2_053 equ     DESCALE(2204520673,30-CONST_BITS)       ; FIX(2.053119869)
F_2_562 equ     DESCALE(2751909506,30-CONST_BITS)       ; FIX(2.562915447)
F_3_072 equ     DESCALE(3299298341,30-CONST_BITS)       ; FIX(3.072711026)
%endif

; --------------------------------------------------------------------------
        SECTION SEG_CONST

        alignz  16
        global  EXTN(jconst_fdct_islow_mmx)

EXTN(jconst_fdct_islow_mmx):

PW_F130_F054    times 2 dw  (F_0_541+F_0_765), F_0_541
PW_F054_MF130   times 2 dw  F_0_541, (F_0_541-F_1_847)
PW_MF078_F117   times 2 dw  (F_1_175-F_1_961), F_1_175
PW_F117_F078    times 2 dw  F_1_175, (F_1_175-F_0_390)
PW_MF060_MF089  times 2 dw  (F_0_298-F_0_899),-F_0_899
PW_MF089_F060   times 2 dw -F_0_899, (F_1_501-F_0_899)
PW_MF050_MF256  times 2 dw  (F_2_053-F_2_562),-F_2_562
PW_MF256_F050   times 2 dw -F_2_562, (F_3_072-F_2_562)
PD_DESCALE_P1   times 2 dd  1 << (DESCALE_P1-1)
PD_DESCALE_P2   times 2 dd  1 << (DESCALE_P2-1)
PW_DESCALE_P2X  times 4 dw  1 << (PASS1_BITS-1)

        alignz  16

; --------------------------------------------------------------------------
        SECTION SEG_TEXT
        BITS    32
;
; Perform the forward DCT on one block of samples.
;
; GLOBAL(void)
; jsimd_fdct_islow_mmx (DCTELEM *data)
;

%define data(b)         (b)+8           ; DCTELEM *data

%define original_ebp    ebp+0
%define wk(i)           ebp-(WK_NUM-(i))*SIZEOF_MMWORD  ; mmword wk[WK_NUM]
%define WK_NUM          2

        align   16
        global  EXTN(jsimd_fdct_islow_mmx)

EXTN(jsimd_fdct_islow_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, [wk(0)]
        pushpic ebx
;       push    ecx             ; need not be preserved
;       push    edx             ; need not be preserved
;       push    esi             ; unused
;       push    edi             ; unused

        get_GOT ebx             ; get GOT address

        ; ---- Pass 1: process rows.

        mov     edx, POINTER [data(eax)]        ; (DCTELEM *)
        mov     ecx, DCTSIZE/4
        alignx  16,7
.rowloop:

        movq    mm0, MMWORD [MMBLOCK(2,0,edx,SIZEOF_DCTELEM)]
        movq    mm1, MMWORD [MMBLOCK(3,0,edx,SIZEOF_DCTELEM)]
        movq    mm2, MMWORD [MMBLOCK(2,1,edx,SIZEOF_DCTELEM)]
        movq    mm3, MMWORD [MMBLOCK(3,1,edx,SIZEOF_DCTELEM)]

        ; mm0=(20 21 22 23), mm2=(24 25 26 27)
        ; mm1=(30 31 32 33), mm3=(34 35 36 37)

        movq      mm4,mm0               ; transpose coefficients(phase 1)
        punpcklwd mm0,mm1               ; mm0=(20 30 21 31)
        punpckhwd mm4,mm1               ; mm4=(22 32 23 33)
        movq      mm5,mm2               ; transpose coefficients(phase 1)
        punpcklwd mm2,mm3               ; mm2=(24 34 25 35)
        punpckhwd mm5,mm3               ; mm5=(26 36 27 37)

        movq    mm6, MMWORD [MMBLOCK(0,0,edx,SIZEOF_DCTELEM)]
        movq    mm7, MMWORD [MMBLOCK(1,0,edx,SIZEOF_DCTELEM)]
        movq    mm1, MMWORD [MMBLOCK(0,1,edx,SIZEOF_DCTELEM)]
        movq    mm3, MMWORD [MMBLOCK(1,1,edx,SIZEOF_DCTELEM)]

        ; mm6=(00 01 02 03), mm1=(04 05 06 07)
        ; mm7=(10 11 12 13), mm3=(14 15 16 17)

        movq    MMWORD [wk(0)], mm4     ; wk(0)=(22 32 23 33)
        movq    MMWORD [wk(1)], mm2     ; wk(1)=(24 34 25 35)

        movq      mm4,mm6               ; transpose coefficients(phase 1)
        punpcklwd mm6,mm7               ; mm6=(00 10 01 11)
        punpckhwd mm4,mm7               ; mm4=(02 12 03 13)
        movq      mm2,mm1               ; transpose coefficients(phase 1)
        punpcklwd mm1,mm3               ; mm1=(04 14 05 15)
        punpckhwd mm2,mm3               ; mm2=(06 16 07 17)

        movq      mm7,mm6               ; transpose coefficients(phase 2)
        punpckldq mm6,mm0               ; mm6=(00 10 20 30)=data0
        punpckhdq mm7,mm0               ; mm7=(01 11 21 31)=data1
        movq      mm3,mm2               ; transpose coefficients(phase 2)
        punpckldq mm2,mm5               ; mm2=(06 16 26 36)=data6
        punpckhdq mm3,mm5               ; mm3=(07 17 27 37)=data7

        movq    mm0,mm7
        movq    mm5,mm6
        psubw   mm7,mm2                 ; mm7=data1-data6=tmp6
        psubw   mm6,mm3                 ; mm6=data0-data7=tmp7
        paddw   mm0,mm2                 ; mm0=data1+data6=tmp1
        paddw   mm5,mm3                 ; mm5=data0+data7=tmp0

        movq    mm2, MMWORD [wk(0)]     ; mm2=(22 32 23 33)
        movq    mm3, MMWORD [wk(1)]     ; mm3=(24 34 25 35)
        movq    MMWORD [wk(0)], mm7     ; wk(0)=tmp6
        movq    MMWORD [wk(1)], mm6     ; wk(1)=tmp7

        movq      mm7,mm4               ; transpose coefficients(phase 2)
        punpckldq mm4,mm2               ; mm4=(02 12 22 32)=data2
        punpckhdq mm7,mm2               ; mm7=(03 13 23 33)=data3
        movq      mm6,mm1               ; transpose coefficients(phase 2)
        punpckldq mm1,mm3               ; mm1=(04 14 24 34)=data4
        punpckhdq mm6,mm3               ; mm6=(05 15 25 35)=data5

        movq    mm2,mm7
        movq    mm3,mm4
        paddw   mm7,mm1                 ; mm7=data3+data4=tmp3
        paddw   mm4,mm6                 ; mm4=data2+data5=tmp2
        psubw   mm2,mm1                 ; mm2=data3-data4=tmp4
        psubw   mm3,mm6                 ; mm3=data2-data5=tmp5

        ; -- Even part

        movq    mm1,mm5
        movq    mm6,mm0
        paddw   mm5,mm7                 ; mm5=tmp10
        paddw   mm0,mm4                 ; mm0=tmp11
        psubw   mm1,mm7                 ; mm1=tmp13
        psubw   mm6,mm4                 ; mm6=tmp12

        movq    mm7,mm5
        paddw   mm5,mm0                 ; mm5=tmp10+tmp11
        psubw   mm7,mm0                 ; mm7=tmp10-tmp11

        psllw   mm5,PASS1_BITS          ; mm5=data0
        psllw   mm7,PASS1_BITS          ; mm7=data4

        movq    MMWORD [MMBLOCK(0,0,edx,SIZEOF_DCTELEM)], mm5
        movq    MMWORD [MMBLOCK(0,1,edx,SIZEOF_DCTELEM)], mm7

        ; (Original)
        ; z1 = (tmp12 + tmp13) * 0.541196100;
        ; data2 = z1 + tmp13 * 0.765366865;
        ; data6 = z1 + tmp12 * -1.847759065;
        ;
        ; (This implementation)
        ; data2 = tmp13 * (0.541196100 + 0.765366865) + tmp12 * 0.541196100;
        ; data6 = tmp13 * 0.541196100 + tmp12 * (0.541196100 - 1.847759065);

        movq      mm4,mm1               ; mm1=tmp13
        movq      mm0,mm1
        punpcklwd mm4,mm6               ; mm6=tmp12
        punpckhwd mm0,mm6
        movq      mm1,mm4
        movq      mm6,mm0
        pmaddwd   mm4,[GOTOFF(ebx,PW_F130_F054)]        ; mm4=data2L
        pmaddwd   mm0,[GOTOFF(ebx,PW_F130_F054)]        ; mm0=data2H
        pmaddwd   mm1,[GOTOFF(ebx,PW_F054_MF130)]       ; mm1=data6L
        pmaddwd   mm6,[GOTOFF(ebx,PW_F054_MF130)]       ; mm6=data6H

        paddd   mm4,[GOTOFF(ebx,PD_DESCALE_P1)]
        paddd   mm0,[GOTOFF(ebx,PD_DESCALE_P1)]
        psrad   mm4,DESCALE_P1
        psrad   mm0,DESCALE_P1
        paddd   mm1,[GOTOFF(ebx,PD_DESCALE_P1)]
        paddd   mm6,[GOTOFF(ebx,PD_DESCALE_P1)]
        psrad   mm1,DESCALE_P1
        psrad   mm6,DESCALE_P1

        packssdw  mm4,mm0               ; mm4=data2
        packssdw  mm1,mm6               ; mm1=data6

        movq    MMWORD [MMBLOCK(2,0,edx,SIZEOF_DCTELEM)], mm4
        movq    MMWORD [MMBLOCK(2,1,edx,SIZEOF_DCTELEM)], mm1

        ; -- Odd part

        movq    mm5, MMWORD [wk(0)]     ; mm5=tmp6
        movq    mm7, MMWORD [wk(1)]     ; mm7=tmp7

        movq    mm0,mm2                 ; mm2=tmp4
        movq    mm6,mm3                 ; mm3=tmp5
        paddw   mm0,mm5                 ; mm0=z3
        paddw   mm6,mm7                 ; mm6=z4

        ; (Original)
        ; z5 = (z3 + z4) * 1.175875602;
        ; z3 = z3 * -1.961570560;  z4 = z4 * -0.390180644;
        ; z3 += z5;  z4 += z5;
        ;
        ; (This implementation)
        ; z3 = z3 * (1.175875602 - 1.961570560) + z4 * 1.175875602;
        ; z4 = z3 * 1.175875602 + z4 * (1.175875602 - 0.390180644);

        movq      mm4,mm0
        movq      mm1,mm0
        punpcklwd mm4,mm6
        punpckhwd mm1,mm6
        movq      mm0,mm4
        movq      mm6,mm1
        pmaddwd   mm4,[GOTOFF(ebx,PW_MF078_F117)]       ; mm4=z3L
        pmaddwd   mm1,[GOTOFF(ebx,PW_MF078_F117)]       ; mm1=z3H
        pmaddwd   mm0,[GOTOFF(ebx,PW_F117_F078)]        ; mm0=z4L
        pmaddwd   mm6,[GOTOFF(ebx,PW_F117_F078)]        ; mm6=z4H

        movq    MMWORD [wk(0)], mm4     ; wk(0)=z3L
        movq    MMWORD [wk(1)], mm1     ; wk(1)=z3H

        ; (Original)
        ; z1 = tmp4 + tmp7;  z2 = tmp5 + tmp6;
        ; tmp4 = tmp4 * 0.298631336;  tmp5 = tmp5 * 2.053119869;
        ; tmp6 = tmp6 * 3.072711026;  tmp7 = tmp7 * 1.501321110;
        ; z1 = z1 * -0.899976223;  z2 = z2 * -2.562915447;
        ; data7 = tmp4 + z1 + z3;  data5 = tmp5 + z2 + z4;
        ; data3 = tmp6 + z2 + z3;  data1 = tmp7 + z1 + z4;
        ;
        ; (This implementation)
        ; tmp4 = tmp4 * (0.298631336 - 0.899976223) + tmp7 * -0.899976223;
        ; tmp5 = tmp5 * (2.053119869 - 2.562915447) + tmp6 * -2.562915447;
        ; tmp6 = tmp5 * -2.562915447 + tmp6 * (3.072711026 - 2.562915447);
        ; tmp7 = tmp4 * -0.899976223 + tmp7 * (1.501321110 - 0.899976223);
        ; data7 = tmp4 + z3;  data5 = tmp5 + z4;
        ; data3 = tmp6 + z3;  data1 = tmp7 + z4;

        movq      mm4,mm2
        movq      mm1,mm2
        punpcklwd mm4,mm7
        punpckhwd mm1,mm7
        movq      mm2,mm4
        movq      mm7,mm1
        pmaddwd   mm4,[GOTOFF(ebx,PW_MF060_MF089)]      ; mm4=tmp4L
        pmaddwd   mm1,[GOTOFF(ebx,PW_MF060_MF089)]      ; mm1=tmp4H
        pmaddwd   mm2,[GOTOFF(ebx,PW_MF089_F060)]       ; mm2=tmp7L
        pmaddwd   mm7,[GOTOFF(ebx,PW_MF089_F060)]       ; mm7=tmp7H

        paddd   mm4, MMWORD [wk(0)]     ; mm4=data7L
        paddd   mm1, MMWORD [wk(1)]     ; mm1=data7H
        paddd   mm2,mm0                 ; mm2=data1L
        paddd   mm7,mm6                 ; mm7=data1H

        paddd   mm4,[GOTOFF(ebx,PD_DESCALE_P1)]
        paddd   mm1,[GOTOFF(ebx,PD_DESCALE_P1)]
        psrad   mm4,DESCALE_P1
        psrad   mm1,DESCALE_P1
        paddd   mm2,[GOTOFF(ebx,PD_DESCALE_P1)]
        paddd   mm7,[GOTOFF(ebx,PD_DESCALE_P1)]
        psrad   mm2,DESCALE_P1
        psrad   mm7,DESCALE_P1

        packssdw  mm4,mm1               ; mm4=data7
        packssdw  mm2,mm7               ; mm2=data1

        movq    MMWORD [MMBLOCK(3,1,edx,SIZEOF_DCTELEM)], mm4
        movq    MMWORD [MMBLOCK(1,0,edx,SIZEOF_DCTELEM)], mm2

        movq      mm1,mm3
        movq      mm7,mm3
        punpcklwd mm1,mm5
        punpckhwd mm7,mm5
        movq      mm3,mm1
        movq      mm5,mm7
        pmaddwd   mm1,[GOTOFF(ebx,PW_MF050_MF256)]      ; mm1=tmp5L
        pmaddwd   mm7,[GOTOFF(ebx,PW_MF050_MF256)]      ; mm7=tmp5H
        pmaddwd   mm3,[GOTOFF(ebx,PW_MF256_F050)]       ; mm3=tmp6L
        pmaddwd   mm5,[GOTOFF(ebx,PW_MF256_F050)]       ; mm5=tmp6H

        paddd   mm1,mm0                 ; mm1=data5L
        paddd   mm7,mm6                 ; mm7=data5H
        paddd   mm3, MMWORD [wk(0)]     ; mm3=data3L
        paddd   mm5, MMWORD [wk(1)]     ; mm5=data3H

        paddd   mm1,[GOTOFF(ebx,PD_DESCALE_P1)]
        paddd   mm7,[GOTOFF(ebx,PD_DESCALE_P1)]
        psrad   mm1,DESCALE_P1
        psrad   mm7,DESCALE_P1
        paddd   mm3,[GOTOFF(ebx,PD_DESCALE_P1)]
        paddd   mm5,[GOTOFF(ebx,PD_DESCALE_P1)]
        psrad   mm3,DESCALE_P1
        psrad   mm5,DESCALE_P1

        packssdw  mm1,mm7               ; mm1=data5
        packssdw  mm3,mm5               ; mm3=data3

        movq    MMWORD [MMBLOCK(1,1,edx,SIZEOF_DCTELEM)], mm1
        movq    MMWORD [MMBLOCK(3,0,edx,SIZEOF_DCTELEM)], mm3

        add     edx, byte 4*DCTSIZE*SIZEOF_DCTELEM
        dec     ecx
        jnz     near .rowloop

        ; ---- Pass 2: process columns.

        mov     edx, POINTER [data(eax)]        ; (DCTELEM *)
        mov     ecx, DCTSIZE/4
        alignx  16,7
.columnloop:

        movq    mm0, MMWORD [MMBLOCK(2,0,edx,SIZEOF_DCTELEM)]
        movq    mm1, MMWORD [MMBLOCK(3,0,edx,SIZEOF_DCTELEM)]
        movq    mm2, MMWORD [MMBLOCK(6,0,edx,SIZEOF_DCTELEM)]
        movq    mm3, MMWORD [MMBLOCK(7,0,edx,SIZEOF_DCTELEM)]

        ; mm0=(02 12 22 32), mm2=(42 52 62 72)
        ; mm1=(03 13 23 33), mm3=(43 53 63 73)

        movq      mm4,mm0               ; transpose coefficients(phase 1)
        punpcklwd mm0,mm1               ; mm0=(02 03 12 13)
        punpckhwd mm4,mm1               ; mm4=(22 23 32 33)
        movq      mm5,mm2               ; transpose coefficients(phase 1)
        punpcklwd mm2,mm3               ; mm2=(42 43 52 53)
        punpckhwd mm5,mm3               ; mm5=(62 63 72 73)

        movq    mm6, MMWORD [MMBLOCK(0,0,edx,SIZEOF_DCTELEM)]
        movq    mm7, MMWORD [MMBLOCK(1,0,edx,SIZEOF_DCTELEM)]
        movq    mm1, MMWORD [MMBLOCK(4,0,edx,SIZEOF_DCTELEM)]
        movq    mm3, MMWORD [MMBLOCK(5,0,edx,SIZEOF_DCTELEM)]

        ; mm6=(00 10 20 30), mm1=(40 50 60 70)
        ; mm7=(01 11 21 31), mm3=(41 51 61 71)

        movq    MMWORD [wk(0)], mm4     ; wk(0)=(22 23 32 33)
        movq    MMWORD [wk(1)], mm2     ; wk(1)=(42 43 52 53)

        movq      mm4,mm6               ; transpose coefficients(phase 1)
        punpcklwd mm6,mm7               ; mm6=(00 01 10 11)
        punpckhwd mm4,mm7               ; mm4=(20 21 30 31)
        movq      mm2,mm1               ; transpose coefficients(phase 1)
        punpcklwd mm1,mm3               ; mm1=(40 41 50 51)
        punpckhwd mm2,mm3               ; mm2=(60 61 70 71)

        movq      mm7,mm6               ; transpose coefficients(phase 2)
        punpckldq mm6,mm0               ; mm6=(00 01 02 03)=data0
        punpckhdq mm7,mm0               ; mm7=(10 11 12 13)=data1
        movq      mm3,mm2               ; transpose coefficients(phase 2)
        punpckldq mm2,mm5               ; mm2=(60 61 62 63)=data6
        punpckhdq mm3,mm5               ; mm3=(70 71 72 73)=data7

        movq    mm0,mm7
        movq    mm5,mm6
        psubw   mm7,mm2                 ; mm7=data1-data6=tmp6
        psubw   mm6,mm3                 ; mm6=data0-data7=tmp7
        paddw   mm0,mm2                 ; mm0=data1+data6=tmp1
        paddw   mm5,mm3                 ; mm5=data0+data7=tmp0

        movq    mm2, MMWORD [wk(0)]     ; mm2=(22 23 32 33)
        movq    mm3, MMWORD [wk(1)]     ; mm3=(42 43 52 53)
        movq    MMWORD [wk(0)], mm7     ; wk(0)=tmp6
        movq    MMWORD [wk(1)], mm6     ; wk(1)=tmp7

        movq      mm7,mm4               ; transpose coefficients(phase 2)
        punpckldq mm4,mm2               ; mm4=(20 21 22 23)=data2
        punpckhdq mm7,mm2               ; mm7=(30 31 32 33)=data3
        movq      mm6,mm1               ; transpose coefficients(phase 2)
        punpckldq mm1,mm3               ; mm1=(40 41 42 43)=data4
        punpckhdq mm6,mm3               ; mm6=(50 51 52 53)=data5

        movq    mm2,mm7
        movq    mm3,mm4
        paddw   mm7,mm1                 ; mm7=data3+data4=tmp3
        paddw   mm4,mm6                 ; mm4=data2+data5=tmp2
        psubw   mm2,mm1                 ; mm2=data3-data4=tmp4
        psubw   mm3,mm6                 ; mm3=data2-data5=tmp5

        ; -- Even part

        movq    mm1,mm5
        movq    mm6,mm0
        paddw   mm5,mm7                 ; mm5=tmp10
        paddw   mm0,mm4                 ; mm0=tmp11
        psubw   mm1,mm7                 ; mm1=tmp13
        psubw   mm6,mm4                 ; mm6=tmp12

        movq    mm7,mm5
        paddw   mm5,mm0                 ; mm5=tmp10+tmp11
        psubw   mm7,mm0                 ; mm7=tmp10-tmp11

        paddw   mm5,[GOTOFF(ebx,PW_DESCALE_P2X)]
        paddw   mm7,[GOTOFF(ebx,PW_DESCALE_P2X)]
        psraw   mm5,PASS1_BITS          ; mm5=data0
        psraw   mm7,PASS1_BITS          ; mm7=data4

        movq    MMWORD [MMBLOCK(0,0,edx,SIZEOF_DCTELEM)], mm5
        movq    MMWORD [MMBLOCK(4,0,edx,SIZEOF_DCTELEM)], mm7

        ; (Original)
        ; z1 = (tmp12 + tmp13) * 0.541196100;
        ; data2 = z1 + tmp13 * 0.765366865;
        ; data6 = z1 + tmp12 * -1.847759065;
        ;
        ; (This implementation)
        ; data2 = tmp13 * (0.541196100 + 0.765366865) + tmp12 * 0.541196100;
        ; data6 = tmp13 * 0.541196100 + tmp12 * (0.541196100 - 1.847759065);

        movq      mm4,mm1               ; mm1=tmp13
        movq      mm0,mm1
        punpcklwd mm4,mm6               ; mm6=tmp12
        punpckhwd mm0,mm6
        movq      mm1,mm4
        movq      mm6,mm0
        pmaddwd   mm4,[GOTOFF(ebx,PW_F130_F054)]        ; mm4=data2L
        pmaddwd   mm0,[GOTOFF(ebx,PW_F130_F054)]        ; mm0=data2H
        pmaddwd   mm1,[GOTOFF(ebx,PW_F054_MF130)]       ; mm1=data6L
        pmaddwd   mm6,[GOTOFF(ebx,PW_F054_MF130)]       ; mm6=data6H

        paddd   mm4,[GOTOFF(ebx,PD_DESCALE_P2)]
        paddd   mm0,[GOTOFF(ebx,PD_DESCALE_P2)]
        psrad   mm4,DESCALE_P2
        psrad   mm0,DESCALE_P2
        paddd   mm1,[GOTOFF(ebx,PD_DESCALE_P2)]
        paddd   mm6,[GOTOFF(ebx,PD_DESCALE_P2)]
        psrad   mm1,DESCALE_P2
        psrad   mm6,DESCALE_P2

        packssdw  mm4,mm0               ; mm4=data2
        packssdw  mm1,mm6               ; mm1=data6

        movq    MMWORD [MMBLOCK(2,0,edx,SIZEOF_DCTELEM)], mm4
        movq    MMWORD [MMBLOCK(6,0,edx,SIZEOF_DCTELEM)], mm1

        ; -- Odd part

        movq    mm5, MMWORD [wk(0)]     ; mm5=tmp6
        movq    mm7, MMWORD [wk(1)]     ; mm7=tmp7

        movq    mm0,mm2                 ; mm2=tmp4
        movq    mm6,mm3                 ; mm3=tmp5
        paddw   mm0,mm5                 ; mm0=z3
        paddw   mm6,mm7                 ; mm6=z4

        ; (Original)
        ; z5 = (z3 + z4) * 1.175875602;
        ; z3 = z3 * -1.961570560;  z4 = z4 * -0.390180644;
        ; z3 += z5;  z4 += z5;
        ;
        ; (This implementation)
        ; z3 = z3 * (1.175875602 - 1.961570560) + z4 * 1.175875602;
        ; z4 = z3 * 1.175875602 + z4 * (1.175875602 - 0.390180644);

        movq      mm4,mm0
        movq      mm1,mm0
        punpcklwd mm4,mm6
        punpckhwd mm1,mm6
        movq      mm0,mm4
        movq      mm6,mm1
        pmaddwd   mm4,[GOTOFF(ebx,PW_MF078_F117)]       ; mm4=z3L
        pmaddwd   mm1,[GOTOFF(ebx,PW_MF078_F117)]       ; mm1=z3H
        pmaddwd   mm0,[GOTOFF(ebx,PW_F117_F078)]        ; mm0=z4L
        pmaddwd   mm6,[GOTOFF(ebx,PW_F117_F078)]        ; mm6=z4H

        movq    MMWORD [wk(0)], mm4     ; wk(0)=z3L
        movq    MMWORD [wk(1)], mm1     ; wk(1)=z3H

        ; (Original)
        ; z1 = tmp4 + tmp7;  z2 = tmp5 + tmp6;
        ; tmp4 = tmp4 * 0.298631336;  tmp5 = tmp5 * 2.053119869;
        ; tmp6 = tmp6 * 3.072711026;  tmp7 = tmp7 * 1.501321110;
        ; z1 = z1 * -0.899976223;  z2 = z2 * -2.562915447;
        ; data7 = tmp4 + z1 + z3;  data5 = tmp5 + z2 + z4;
        ; data3 = tmp6 + z2 + z3;  data1 = tmp7 + z1 + z4;
        ;
        ; (This implementation)
        ; tmp4 = tmp4 * (0.298631336 - 0.899976223) + tmp7 * -0.899976223;
        ; tmp5 = tmp5 * (2.053119869 - 2.562915447) + tmp6 * -2.562915447;
        ; tmp6 = tmp5 * -2.562915447 + tmp6 * (3.072711026 - 2.562915447);
        ; tmp7 = tmp4 * -0.899976223 + tmp7 * (1.501321110 - 0.899976223);
        ; data7 = tmp4 + z3;  data5 = tmp5 + z4;
        ; data3 = tmp6 + z3;  data1 = tmp7 + z4;

        movq      mm4,mm2
        movq      mm1,mm2
        punpcklwd mm4,mm7
        punpckhwd mm1,mm7
        movq      mm2,mm4
        movq      mm7,mm1
        pmaddwd   mm4,[GOTOFF(ebx,PW_MF060_MF089)]      ; mm4=tmp4L
        pmaddwd   mm1,[GOTOFF(ebx,PW_MF060_MF089)]      ; mm1=tmp4H
        pmaddwd   mm2,[GOTOFF(ebx,PW_MF089_F060)]       ; mm2=tmp7L
        pmaddwd   mm7,[GOTOFF(ebx,PW_MF089_F060)]       ; mm7=tmp7H

        paddd   mm4, MMWORD [wk(0)]     ; mm4=data7L
        paddd   mm1, MMWORD [wk(1)]     ; mm1=data7H
        paddd   mm2,mm0                 ; mm2=data1L
        paddd   mm7,mm6                 ; mm7=data1H

        paddd   mm4,[GOTOFF(ebx,PD_DESCALE_P2)]
        paddd   mm1,[GOTOFF(ebx,PD_DESCALE_P2)]
        psrad   mm4,DESCALE_P2
        psrad   mm1,DESCALE_P2
        paddd   mm2,[GOTOFF(ebx,PD_DESCALE_P2)]
        paddd   mm7,[GOTOFF(ebx,PD_DESCALE_P2)]
        psrad   mm2,DESCALE_P2
        psrad   mm7,DESCALE_P2

        packssdw  mm4,mm1               ; mm4=data7
        packssdw  mm2,mm7               ; mm2=data1

        movq    MMWORD [MMBLOCK(7,0,edx,SIZEOF_DCTELEM)], mm4
        movq    MMWORD [MMBLOCK(1,0,edx,SIZEOF_DCTELEM)], mm2

        movq      mm1,mm3
        movq      mm7,mm3
        punpcklwd mm1,mm5
        punpckhwd mm7,mm5
        movq      mm3,mm1
        movq      mm5,mm7
        pmaddwd   mm1,[GOTOFF(ebx,PW_MF050_MF256)]      ; mm1=tmp5L
        pmaddwd   mm7,[GOTOFF(ebx,PW_MF050_MF256)]      ; mm7=tmp5H
        pmaddwd   mm3,[GOTOFF(ebx,PW_MF256_F050)]       ; mm3=tmp6L
        pmaddwd   mm5,[GOTOFF(ebx,PW_MF256_F050)]       ; mm5=tmp6H

        paddd   mm1,mm0                 ; mm1=data5L
        paddd   mm7,mm6                 ; mm7=data5H
        paddd   mm3, MMWORD [wk(0)]     ; mm3=data3L
        paddd   mm5, MMWORD [wk(1)]     ; mm5=data3H

        paddd   mm1,[GOTOFF(ebx,PD_DESCALE_P2)]
        paddd   mm7,[GOTOFF(ebx,PD_DESCALE_P2)]
        psrad   mm1,DESCALE_P2
        psrad   mm7,DESCALE_P2
        paddd   mm3,[GOTOFF(ebx,PD_DESCALE_P2)]
        paddd   mm5,[GOTOFF(ebx,PD_DESCALE_P2)]
        psrad   mm3,DESCALE_P2
        psrad   mm5,DESCALE_P2

        packssdw  mm1,mm7               ; mm1=data5
        packssdw  mm3,mm5               ; mm3=data3

        movq    MMWORD [MMBLOCK(5,0,edx,SIZEOF_DCTELEM)], mm1
        movq    MMWORD [MMBLOCK(3,0,edx,SIZEOF_DCTELEM)], mm3

        add     edx, byte 4*SIZEOF_DCTELEM
        dec     ecx
        jnz     near .columnloop

        emms            ; empty MMX state

;       pop     edi             ; unused
;       pop     esi             ; unused
;       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

; For some reason, the OS X linker does not honor the request to align the
; segment unless we do this.
        align   16