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
|
;
; jidctfst.asm - fast integer IDCT (MMX)
;
; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
; Copyright (C) 2016, D. R. Commander.
;
; 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 fast, not so accurate integer implementation of
; the inverse DCT (Discrete Cosine Transform). The following code is
; based directly on the IJG's original jidctfst.c; see the jidctfst.c
; for more details.
%include "jsimdext.inc"
%include "jdct.inc"
; --------------------------------------------------------------------------
%define CONST_BITS 8 ; 14 is also OK.
%define PASS1_BITS 2
%if IFAST_SCALE_BITS != PASS1_BITS
%error "'IFAST_SCALE_BITS' must be equal to 'PASS1_BITS'."
%endif
%if CONST_BITS == 8
F_1_082 equ 277 ; FIX(1.082392200)
F_1_414 equ 362 ; FIX(1.414213562)
F_1_847 equ 473 ; FIX(1.847759065)
F_2_613 equ 669 ; FIX(2.613125930)
F_1_613 equ (F_2_613 - 256) ; FIX(2.613125930) - FIX(1)
%else
; NASM cannot do compile-time arithmetic on floating-point constants.
%define DESCALE(x, n) (((x) + (1 << ((n) - 1))) >> (n))
F_1_082 equ DESCALE(1162209775, 30 - CONST_BITS) ; FIX(1.082392200)
F_1_414 equ DESCALE(1518500249, 30 - CONST_BITS) ; FIX(1.414213562)
F_1_847 equ DESCALE(1984016188, 30 - CONST_BITS) ; FIX(1.847759065)
F_2_613 equ DESCALE(2805822602, 30 - CONST_BITS) ; FIX(2.613125930)
F_1_613 equ (F_2_613 - (1 << CONST_BITS)) ; FIX(2.613125930) - FIX(1)
%endif
; --------------------------------------------------------------------------
SECTION SEG_CONST
; PRE_MULTIPLY_SCALE_BITS <= 2 (to avoid overflow)
; CONST_BITS + CONST_SHIFT + PRE_MULTIPLY_SCALE_BITS == 16 (for pmulhw)
%define PRE_MULTIPLY_SCALE_BITS 2
%define CONST_SHIFT (16 - PRE_MULTIPLY_SCALE_BITS - CONST_BITS)
alignz 32
GLOBAL_DATA(jconst_idct_ifast_mmx)
EXTN(jconst_idct_ifast_mmx):
PW_F1414 times 4 dw F_1_414 << CONST_SHIFT
PW_F1847 times 4 dw F_1_847 << CONST_SHIFT
PW_MF1613 times 4 dw -F_1_613 << CONST_SHIFT
PW_F1082 times 4 dw F_1_082 << CONST_SHIFT
PB_CENTERJSAMP times 8 db CENTERJSAMPLE
alignz 32
; --------------------------------------------------------------------------
SECTION SEG_TEXT
BITS 32
;
; Perform dequantization and inverse DCT on one block of coefficients.
;
; GLOBAL(void)
; jsimd_idct_ifast_mmx(void *dct_table, JCOEFPTR coef_block,
; JSAMPARRAY output_buf, JDIMENSION output_col)
;
%define dct_table(b) (b) + 8 ; jpeg_component_info *compptr
%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 32
GLOBAL_FUNCTION(jsimd_idct_ifast_mmx)
EXTN(jsimd_idct_ifast_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]
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, 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_IFAST_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(4,0,esi,SIZEOF_JCOEF)]
por mm0, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)]
por mm1, MMWORD [MMBLOCK(6,0,esi,SIZEOF_JCOEF)]
por mm0, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)]
por mm1, mm0
packsswb mm1, mm1
movd eax, mm1
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_IFAST_MULT_TYPE)]
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(0,1,edi,SIZEOF_JCOEF)], mm0
movq MMWORD [MMBLOCK(1,0,edi,SIZEOF_JCOEF)], mm1
movq MMWORD [MMBLOCK(1,1,edi,SIZEOF_JCOEF)], mm1
movq MMWORD [MMBLOCK(2,0,edi,SIZEOF_JCOEF)], mm2
movq MMWORD [MMBLOCK(2,1,edi,SIZEOF_JCOEF)], mm2
movq MMWORD [MMBLOCK(3,0,edi,SIZEOF_JCOEF)], mm3
movq MMWORD [MMBLOCK(3,1,edi,SIZEOF_JCOEF)], mm3
jmp near .nextcolumn
alignx 16, 7
%endif
.columnDCT:
; -- Even part
movq mm0, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)]
movq mm1, MMWORD [MMBLOCK(2,0,esi,SIZEOF_JCOEF)]
pmullw mm0, MMWORD [MMBLOCK(0,0,edx,SIZEOF_IFAST_MULT_TYPE)]
pmullw mm1, MMWORD [MMBLOCK(2,0,edx,SIZEOF_IFAST_MULT_TYPE)]
movq mm2, MMWORD [MMBLOCK(4,0,esi,SIZEOF_JCOEF)]
movq mm3, MMWORD [MMBLOCK(6,0,esi,SIZEOF_JCOEF)]
pmullw mm2, MMWORD [MMBLOCK(4,0,edx,SIZEOF_IFAST_MULT_TYPE)]
pmullw mm3, MMWORD [MMBLOCK(6,0,edx,SIZEOF_IFAST_MULT_TYPE)]
movq mm4, mm0
movq mm5, mm1
psubw mm0, mm2 ; mm0=tmp11
psubw mm1, mm3
paddw mm4, mm2 ; mm4=tmp10
paddw mm5, mm3 ; mm5=tmp13
psllw mm1, PRE_MULTIPLY_SCALE_BITS
pmulhw mm1, [GOTOFF(ebx,PW_F1414)]
psubw mm1, mm5 ; mm1=tmp12
movq mm6, mm4
movq mm7, mm0
psubw mm4, mm5 ; mm4=tmp3
psubw mm0, mm1 ; mm0=tmp2
paddw mm6, mm5 ; mm6=tmp0
paddw mm7, mm1 ; mm7=tmp1
movq MMWORD [wk(1)], mm4 ; wk(1)=tmp3
movq MMWORD [wk(0)], mm0 ; wk(0)=tmp2
; -- Odd part
movq mm2, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)]
movq mm3, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)]
pmullw mm2, MMWORD [MMBLOCK(1,0,edx,SIZEOF_IFAST_MULT_TYPE)]
pmullw mm3, MMWORD [MMBLOCK(3,0,edx,SIZEOF_IFAST_MULT_TYPE)]
movq mm5, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)]
movq mm1, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)]
pmullw mm5, MMWORD [MMBLOCK(5,0,edx,SIZEOF_IFAST_MULT_TYPE)]
pmullw mm1, MMWORD [MMBLOCK(7,0,edx,SIZEOF_IFAST_MULT_TYPE)]
movq mm4, mm2
movq mm0, mm5
psubw mm2, mm1 ; mm2=z12
psubw mm5, mm3 ; mm5=z10
paddw mm4, mm1 ; mm4=z11
paddw mm0, mm3 ; mm0=z13
movq mm1, mm5 ; mm1=z10(unscaled)
psllw mm2, PRE_MULTIPLY_SCALE_BITS
psllw mm5, PRE_MULTIPLY_SCALE_BITS
movq mm3, mm4
psubw mm4, mm0
paddw mm3, mm0 ; mm3=tmp7
psllw mm4, PRE_MULTIPLY_SCALE_BITS
pmulhw mm4, [GOTOFF(ebx,PW_F1414)] ; mm4=tmp11
; To avoid overflow...
;
; (Original)
; tmp12 = -2.613125930 * z10 + z5;
;
; (This implementation)
; tmp12 = (-1.613125930 - 1) * z10 + z5;
; = -1.613125930 * z10 - z10 + z5;
movq mm0, mm5
paddw mm5, mm2
pmulhw mm5, [GOTOFF(ebx,PW_F1847)] ; mm5=z5
pmulhw mm0, [GOTOFF(ebx,PW_MF1613)]
pmulhw mm2, [GOTOFF(ebx,PW_F1082)]
psubw mm0, mm1
psubw mm2, mm5 ; mm2=tmp10
paddw mm0, mm5 ; mm0=tmp12
; -- Final output stage
psubw mm0, mm3 ; mm0=tmp6
movq mm1, mm6
movq mm5, mm7
paddw mm6, mm3 ; mm6=data0=(00 01 02 03)
paddw mm7, mm0 ; mm7=data1=(10 11 12 13)
psubw mm1, mm3 ; mm1=data7=(70 71 72 73)
psubw mm5, mm0 ; mm5=data6=(60 61 62 63)
psubw mm4, mm0 ; mm4=tmp5
movq mm3, mm6 ; transpose coefficients(phase 1)
punpcklwd mm6, mm7 ; mm6=(00 10 01 11)
punpckhwd mm3, mm7 ; mm3=(02 12 03 13)
movq mm0, mm5 ; transpose coefficients(phase 1)
punpcklwd mm5, mm1 ; mm5=(60 70 61 71)
punpckhwd mm0, mm1 ; mm0=(62 72 63 73)
movq mm7, MMWORD [wk(0)] ; mm7=tmp2
movq mm1, MMWORD [wk(1)] ; mm1=tmp3
movq MMWORD [wk(0)], mm5 ; wk(0)=(60 70 61 71)
movq MMWORD [wk(1)], mm0 ; wk(1)=(62 72 63 73)
paddw mm2, mm4 ; mm2=tmp4
movq mm5, mm7
movq mm0, mm1
paddw mm7, mm4 ; mm7=data2=(20 21 22 23)
paddw mm1, mm2 ; mm1=data4=(40 41 42 43)
psubw mm5, mm4 ; mm5=data5=(50 51 52 53)
psubw mm0, mm2 ; mm0=data3=(30 31 32 33)
movq mm4, mm7 ; transpose coefficients(phase 1)
punpcklwd mm7, mm0 ; mm7=(20 30 21 31)
punpckhwd mm4, mm0 ; mm4=(22 32 23 33)
movq mm2, mm1 ; transpose coefficients(phase 1)
punpcklwd mm1, mm5 ; mm1=(40 50 41 51)
punpckhwd mm2, mm5 ; mm2=(42 52 43 53)
movq mm0, mm6 ; transpose coefficients(phase 2)
punpckldq mm6, mm7 ; mm6=(00 10 20 30)
punpckhdq mm0, mm7 ; mm0=(01 11 21 31)
movq mm5, mm3 ; transpose coefficients(phase 2)
punpckldq mm3, mm4 ; mm3=(02 12 22 32)
punpckhdq mm5, mm4 ; mm5=(03 13 23 33)
movq mm7, MMWORD [wk(0)] ; mm7=(60 70 61 71)
movq mm4, MMWORD [wk(1)] ; mm4=(62 72 63 73)
movq MMWORD [MMBLOCK(0,0,edi,SIZEOF_JCOEF)], mm6
movq MMWORD [MMBLOCK(1,0,edi,SIZEOF_JCOEF)], mm0
movq MMWORD [MMBLOCK(2,0,edi,SIZEOF_JCOEF)], mm3
movq MMWORD [MMBLOCK(3,0,edi,SIZEOF_JCOEF)], mm5
movq mm6, mm1 ; transpose coefficients(phase 2)
punpckldq mm1, mm7 ; mm1=(40 50 60 70)
punpckhdq mm6, mm7 ; mm6=(41 51 61 71)
movq mm0, mm2 ; transpose coefficients(phase 2)
punpckldq mm2, mm4 ; mm2=(42 52 62 72)
punpckhdq mm0, mm4 ; mm0=(43 53 63 73)
movq MMWORD [MMBLOCK(0,1,edi,SIZEOF_JCOEF)], mm1
movq MMWORD [MMBLOCK(1,1,edi,SIZEOF_JCOEF)], mm6
movq MMWORD [MMBLOCK(2,1,edi,SIZEOF_JCOEF)], mm2
movq MMWORD [MMBLOCK(3,1,edi,SIZEOF_JCOEF)], mm0
.nextcolumn:
add esi, byte 4*SIZEOF_JCOEF ; coef_block
add edx, byte 4*SIZEOF_IFAST_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)]
mov ecx, DCTSIZE/4 ; ctr
alignx 16, 7
.rowloop:
; -- Even part
movq mm0, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)]
movq mm1, MMWORD [MMBLOCK(2,0,esi,SIZEOF_JCOEF)]
movq mm2, MMWORD [MMBLOCK(4,0,esi,SIZEOF_JCOEF)]
movq mm3, MMWORD [MMBLOCK(6,0,esi,SIZEOF_JCOEF)]
movq mm4, mm0
movq mm5, mm1
psubw mm0, mm2 ; mm0=tmp11
psubw mm1, mm3
paddw mm4, mm2 ; mm4=tmp10
paddw mm5, mm3 ; mm5=tmp13
psllw mm1, PRE_MULTIPLY_SCALE_BITS
pmulhw mm1, [GOTOFF(ebx,PW_F1414)]
psubw mm1, mm5 ; mm1=tmp12
movq mm6, mm4
movq mm7, mm0
psubw mm4, mm5 ; mm4=tmp3
psubw mm0, mm1 ; mm0=tmp2
paddw mm6, mm5 ; mm6=tmp0
paddw mm7, mm1 ; mm7=tmp1
movq MMWORD [wk(1)], mm4 ; wk(1)=tmp3
movq MMWORD [wk(0)], mm0 ; wk(0)=tmp2
; -- Odd part
movq mm2, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)]
movq mm3, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)]
movq mm5, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)]
movq mm1, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)]
movq mm4, mm2
movq mm0, mm5
psubw mm2, mm1 ; mm2=z12
psubw mm5, mm3 ; mm5=z10
paddw mm4, mm1 ; mm4=z11
paddw mm0, mm3 ; mm0=z13
movq mm1, mm5 ; mm1=z10(unscaled)
psllw mm2, PRE_MULTIPLY_SCALE_BITS
psllw mm5, PRE_MULTIPLY_SCALE_BITS
movq mm3, mm4
psubw mm4, mm0
paddw mm3, mm0 ; mm3=tmp7
psllw mm4, PRE_MULTIPLY_SCALE_BITS
pmulhw mm4, [GOTOFF(ebx,PW_F1414)] ; mm4=tmp11
; To avoid overflow...
;
; (Original)
; tmp12 = -2.613125930 * z10 + z5;
;
; (This implementation)
; tmp12 = (-1.613125930 - 1) * z10 + z5;
; = -1.613125930 * z10 - z10 + z5;
movq mm0, mm5
paddw mm5, mm2
pmulhw mm5, [GOTOFF(ebx,PW_F1847)] ; mm5=z5
pmulhw mm0, [GOTOFF(ebx,PW_MF1613)]
pmulhw mm2, [GOTOFF(ebx,PW_F1082)]
psubw mm0, mm1
psubw mm2, mm5 ; mm2=tmp10
paddw mm0, mm5 ; mm0=tmp12
; -- Final output stage
psubw mm0, mm3 ; mm0=tmp6
movq mm1, mm6
movq mm5, mm7
paddw mm6, mm3 ; mm6=data0=(00 10 20 30)
paddw mm7, mm0 ; mm7=data1=(01 11 21 31)
psraw mm6, (PASS1_BITS+3) ; descale
psraw mm7, (PASS1_BITS+3) ; descale
psubw mm1, mm3 ; mm1=data7=(07 17 27 37)
psubw mm5, mm0 ; mm5=data6=(06 16 26 36)
psraw mm1, (PASS1_BITS+3) ; descale
psraw mm5, (PASS1_BITS+3) ; descale
psubw mm4, mm0 ; mm4=tmp5
packsswb mm6, mm5 ; mm6=(00 10 20 30 06 16 26 36)
packsswb mm7, mm1 ; mm7=(01 11 21 31 07 17 27 37)
movq mm3, MMWORD [wk(0)] ; mm3=tmp2
movq mm0, MMWORD [wk(1)] ; mm0=tmp3
paddw mm2, mm4 ; mm2=tmp4
movq mm5, mm3
movq mm1, mm0
paddw mm3, mm4 ; mm3=data2=(02 12 22 32)
paddw mm0, mm2 ; mm0=data4=(04 14 24 34)
psraw mm3, (PASS1_BITS+3) ; descale
psraw mm0, (PASS1_BITS+3) ; descale
psubw mm5, mm4 ; mm5=data5=(05 15 25 35)
psubw mm1, mm2 ; mm1=data3=(03 13 23 33)
psraw mm5, (PASS1_BITS+3) ; descale
psraw mm1, (PASS1_BITS+3) ; descale
movq mm4, [GOTOFF(ebx,PB_CENTERJSAMP)] ; mm4=[PB_CENTERJSAMP]
packsswb mm3, mm0 ; mm3=(02 12 22 32 04 14 24 34)
packsswb mm1, mm5 ; mm1=(03 13 23 33 05 15 25 35)
paddb mm6, mm4
paddb mm7, mm4
paddb mm3, mm4
paddb mm1, mm4
movq mm2, mm6 ; transpose coefficients(phase 1)
punpcklbw mm6, mm7 ; mm6=(00 01 10 11 20 21 30 31)
punpckhbw mm2, mm7 ; mm2=(06 07 16 17 26 27 36 37)
movq mm0, mm3 ; transpose coefficients(phase 1)
punpcklbw mm3, mm1 ; mm3=(02 03 12 13 22 23 32 33)
punpckhbw mm0, mm1 ; mm0=(04 05 14 15 24 25 34 35)
movq mm5, mm6 ; transpose coefficients(phase 2)
punpcklwd mm6, mm3 ; mm6=(00 01 02 03 10 11 12 13)
punpckhwd mm5, mm3 ; mm5=(20 21 22 23 30 31 32 33)
movq mm4, mm0 ; transpose coefficients(phase 2)
punpcklwd mm0, mm2 ; mm0=(04 05 06 07 14 15 16 17)
punpckhwd mm4, mm2 ; mm4=(24 25 26 27 34 35 36 37)
movq mm7, mm6 ; transpose coefficients(phase 3)
punpckldq mm6, mm0 ; mm6=(00 01 02 03 04 05 06 07)
punpckhdq mm7, mm0 ; mm7=(10 11 12 13 14 15 16 17)
movq mm1, mm5 ; transpose coefficients(phase 3)
punpckldq mm5, mm4 ; mm5=(20 21 22 23 24 25 26 27)
punpckhdq mm1, mm4 ; mm1=(30 31 32 33 34 35 36 37)
pushpic ebx ; save GOT address
mov edx, JSAMPROW [edi+0*SIZEOF_JSAMPROW]
mov ebx, JSAMPROW [edi+1*SIZEOF_JSAMPROW]
movq MMWORD [edx+eax*SIZEOF_JSAMPLE], mm6
movq MMWORD [ebx+eax*SIZEOF_JSAMPLE], mm7
mov edx, JSAMPROW [edi+2*SIZEOF_JSAMPROW]
mov ebx, JSAMPROW [edi+3*SIZEOF_JSAMPROW]
movq MMWORD [edx+eax*SIZEOF_JSAMPLE], mm5
movq MMWORD [ebx+eax*SIZEOF_JSAMPLE], mm1
poppic ebx ; restore GOT address
add esi, byte 4*SIZEOF_JCOEF ; wsptr
add edi, byte 4*SIZEOF_JSAMPROW
dec ecx ; ctr
jnz near .rowloop
emms ; empty MMX state
pop edi
pop esi
; pop edx ; need not be preserved
; pop ecx ; need not be preserved
pop 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 32
|
