summaryrefslogtreecommitdiffstats
path: root/media/libjpeg/simd/jdmrgext-sse2.asm
blob: b50f698b49844649cc354cbf7b7807005e6c689a (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
;
; jdmrgext.asm - merged upsampling/color conversion (SSE2)
;
; Copyright 2009, 2012 Pierre Ossman <ossman@cendio.se> for Cendio AB
; Copyright (C) 2012, 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
;
; [TAB8]

%include "jcolsamp.inc"

; --------------------------------------------------------------------------
;
; Upsample and color convert for the case of 2:1 horizontal and 1:1 vertical.
;
; GLOBAL(void)
; jsimd_h2v1_merged_upsample_sse2 (JDIMENSION output_width,
;                                  JSAMPIMAGE input_buf,
;                                  JDIMENSION in_row_group_ctr,
;                                  JSAMPARRAY output_buf);
;

%define output_width(b) (b)+8                   ; JDIMENSION output_width
%define input_buf(b)            (b)+12          ; JSAMPIMAGE input_buf
%define in_row_group_ctr(b)     (b)+16          ; JDIMENSION in_row_group_ctr
%define output_buf(b)           (b)+20          ; JSAMPARRAY output_buf

%define original_ebp    ebp+0
%define wk(i)           ebp-(WK_NUM-(i))*SIZEOF_XMMWORD ; xmmword wk[WK_NUM]
%define WK_NUM          3
%define gotptr          wk(0)-SIZEOF_POINTER    ; void * gotptr

        align   16
        global  EXTN(jsimd_h2v1_merged_upsample_sse2)

EXTN(jsimd_h2v1_merged_upsample_sse2):
        push    ebp
        mov     eax,esp                         ; eax = original ebp
        sub     esp, byte 4
        and     esp, byte (-SIZEOF_XMMWORD)     ; align to 128 bits
        mov     [esp],eax
        mov     ebp,esp                         ; ebp = aligned ebp
        lea     esp, [wk(0)]
        pushpic eax             ; make a room for GOT address
        push    ebx
;       push    ecx             ; need not be preserved
;       push    edx             ; need not be preserved
        push    esi
        push    edi

        get_GOT ebx                     ; get GOT address
        movpic  POINTER [gotptr], ebx   ; save GOT address

        mov     ecx, JDIMENSION [output_width(eax)]     ; col
        test    ecx,ecx
        jz      near .return

        push    ecx

        mov     edi, JSAMPIMAGE [input_buf(eax)]
        mov     ecx, JDIMENSION [in_row_group_ctr(eax)]
        mov     esi, JSAMPARRAY [edi+0*SIZEOF_JSAMPARRAY]
        mov     ebx, JSAMPARRAY [edi+1*SIZEOF_JSAMPARRAY]
        mov     edx, JSAMPARRAY [edi+2*SIZEOF_JSAMPARRAY]
        mov     edi, JSAMPARRAY [output_buf(eax)]
        mov     esi, JSAMPROW [esi+ecx*SIZEOF_JSAMPROW]         ; inptr0
        mov     ebx, JSAMPROW [ebx+ecx*SIZEOF_JSAMPROW]         ; inptr1
        mov     edx, JSAMPROW [edx+ecx*SIZEOF_JSAMPROW]         ; inptr2
        mov     edi, JSAMPROW [edi]                             ; outptr

        pop     ecx                     ; col

        alignx  16,7
.columnloop:
        movpic  eax, POINTER [gotptr]   ; load GOT address (eax)

        movdqa    xmm6, XMMWORD [ebx]   ; xmm6=Cb(0123456789ABCDEF)
        movdqa    xmm7, XMMWORD [edx]   ; xmm7=Cr(0123456789ABCDEF)

        pxor      xmm1,xmm1             ; xmm1=(all 0's)
        pcmpeqw   xmm3,xmm3
        psllw     xmm3,7                ; xmm3={0xFF80 0xFF80 0xFF80 0xFF80 ..}

        movdqa    xmm4,xmm6
        punpckhbw xmm6,xmm1             ; xmm6=Cb(89ABCDEF)=CbH
        punpcklbw xmm4,xmm1             ; xmm4=Cb(01234567)=CbL
        movdqa    xmm0,xmm7
        punpckhbw xmm7,xmm1             ; xmm7=Cr(89ABCDEF)=CrH
        punpcklbw xmm0,xmm1             ; xmm0=Cr(01234567)=CrL

        paddw     xmm6,xmm3
        paddw     xmm4,xmm3
        paddw     xmm7,xmm3
        paddw     xmm0,xmm3

        ; (Original)
        ; R = Y                + 1.40200 * Cr
        ; G = Y - 0.34414 * Cb - 0.71414 * Cr
        ; B = Y + 1.77200 * Cb
        ;
        ; (This implementation)
        ; R = Y                + 0.40200 * Cr + Cr
        ; G = Y - 0.34414 * Cb + 0.28586 * Cr - Cr
        ; B = Y - 0.22800 * Cb + Cb + Cb

        movdqa  xmm5,xmm6               ; xmm5=CbH
        movdqa  xmm2,xmm4               ; xmm2=CbL
        paddw   xmm6,xmm6               ; xmm6=2*CbH
        paddw   xmm4,xmm4               ; xmm4=2*CbL
        movdqa  xmm1,xmm7               ; xmm1=CrH
        movdqa  xmm3,xmm0               ; xmm3=CrL
        paddw   xmm7,xmm7               ; xmm7=2*CrH
        paddw   xmm0,xmm0               ; xmm0=2*CrL

        pmulhw  xmm6,[GOTOFF(eax,PW_MF0228)]    ; xmm6=(2*CbH * -FIX(0.22800))
        pmulhw  xmm4,[GOTOFF(eax,PW_MF0228)]    ; xmm4=(2*CbL * -FIX(0.22800))
        pmulhw  xmm7,[GOTOFF(eax,PW_F0402)]     ; xmm7=(2*CrH * FIX(0.40200))
        pmulhw  xmm0,[GOTOFF(eax,PW_F0402)]     ; xmm0=(2*CrL * FIX(0.40200))

        paddw   xmm6,[GOTOFF(eax,PW_ONE)]
        paddw   xmm4,[GOTOFF(eax,PW_ONE)]
        psraw   xmm6,1                  ; xmm6=(CbH * -FIX(0.22800))
        psraw   xmm4,1                  ; xmm4=(CbL * -FIX(0.22800))
        paddw   xmm7,[GOTOFF(eax,PW_ONE)]
        paddw   xmm0,[GOTOFF(eax,PW_ONE)]
        psraw   xmm7,1                  ; xmm7=(CrH * FIX(0.40200))
        psraw   xmm0,1                  ; xmm0=(CrL * FIX(0.40200))

        paddw   xmm6,xmm5
        paddw   xmm4,xmm2
        paddw   xmm6,xmm5               ; xmm6=(CbH * FIX(1.77200))=(B-Y)H
        paddw   xmm4,xmm2               ; xmm4=(CbL * FIX(1.77200))=(B-Y)L
        paddw   xmm7,xmm1               ; xmm7=(CrH * FIX(1.40200))=(R-Y)H
        paddw   xmm0,xmm3               ; xmm0=(CrL * FIX(1.40200))=(R-Y)L

        movdqa  XMMWORD [wk(0)], xmm6   ; wk(0)=(B-Y)H
        movdqa  XMMWORD [wk(1)], xmm7   ; wk(1)=(R-Y)H

        movdqa    xmm6,xmm5
        movdqa    xmm7,xmm2
        punpcklwd xmm5,xmm1
        punpckhwd xmm6,xmm1
        pmaddwd   xmm5,[GOTOFF(eax,PW_MF0344_F0285)]
        pmaddwd   xmm6,[GOTOFF(eax,PW_MF0344_F0285)]
        punpcklwd xmm2,xmm3
        punpckhwd xmm7,xmm3
        pmaddwd   xmm2,[GOTOFF(eax,PW_MF0344_F0285)]
        pmaddwd   xmm7,[GOTOFF(eax,PW_MF0344_F0285)]

        paddd     xmm5,[GOTOFF(eax,PD_ONEHALF)]
        paddd     xmm6,[GOTOFF(eax,PD_ONEHALF)]
        psrad     xmm5,SCALEBITS
        psrad     xmm6,SCALEBITS
        paddd     xmm2,[GOTOFF(eax,PD_ONEHALF)]
        paddd     xmm7,[GOTOFF(eax,PD_ONEHALF)]
        psrad     xmm2,SCALEBITS
        psrad     xmm7,SCALEBITS

        packssdw  xmm5,xmm6     ; xmm5=CbH*-FIX(0.344)+CrH*FIX(0.285)
        packssdw  xmm2,xmm7     ; xmm2=CbL*-FIX(0.344)+CrL*FIX(0.285)
        psubw     xmm5,xmm1     ; xmm5=CbH*-FIX(0.344)+CrH*-FIX(0.714)=(G-Y)H
        psubw     xmm2,xmm3     ; xmm2=CbL*-FIX(0.344)+CrL*-FIX(0.714)=(G-Y)L

        movdqa  XMMWORD [wk(2)], xmm5   ; wk(2)=(G-Y)H

        mov     al,2                    ; Yctr
        jmp     short .Yloop_1st
        alignx  16,7

.Yloop_2nd:
        movdqa  xmm0, XMMWORD [wk(1)]   ; xmm0=(R-Y)H
        movdqa  xmm2, XMMWORD [wk(2)]   ; xmm2=(G-Y)H
        movdqa  xmm4, XMMWORD [wk(0)]   ; xmm4=(B-Y)H
        alignx  16,7

.Yloop_1st:
        movdqa  xmm7, XMMWORD [esi]     ; xmm7=Y(0123456789ABCDEF)

        pcmpeqw xmm6,xmm6
        psrlw   xmm6,BYTE_BIT           ; xmm6={0xFF 0x00 0xFF 0x00 ..}
        pand    xmm6,xmm7               ; xmm6=Y(02468ACE)=YE
        psrlw   xmm7,BYTE_BIT           ; xmm7=Y(13579BDF)=YO

        movdqa  xmm1,xmm0               ; xmm1=xmm0=(R-Y)(L/H)
        movdqa  xmm3,xmm2               ; xmm3=xmm2=(G-Y)(L/H)
        movdqa  xmm5,xmm4               ; xmm5=xmm4=(B-Y)(L/H)

        paddw     xmm0,xmm6             ; xmm0=((R-Y)+YE)=RE=R(02468ACE)
        paddw     xmm1,xmm7             ; xmm1=((R-Y)+YO)=RO=R(13579BDF)
        packuswb  xmm0,xmm0             ; xmm0=R(02468ACE********)
        packuswb  xmm1,xmm1             ; xmm1=R(13579BDF********)

        paddw     xmm2,xmm6             ; xmm2=((G-Y)+YE)=GE=G(02468ACE)
        paddw     xmm3,xmm7             ; xmm3=((G-Y)+YO)=GO=G(13579BDF)
        packuswb  xmm2,xmm2             ; xmm2=G(02468ACE********)
        packuswb  xmm3,xmm3             ; xmm3=G(13579BDF********)

        paddw     xmm4,xmm6             ; xmm4=((B-Y)+YE)=BE=B(02468ACE)
        paddw     xmm5,xmm7             ; xmm5=((B-Y)+YO)=BO=B(13579BDF)
        packuswb  xmm4,xmm4             ; xmm4=B(02468ACE********)
        packuswb  xmm5,xmm5             ; xmm5=B(13579BDF********)

%if RGB_PIXELSIZE == 3 ; ---------------

        ; xmmA=(00 02 04 06 08 0A 0C 0E **), xmmB=(01 03 05 07 09 0B 0D 0F **)
        ; xmmC=(10 12 14 16 18 1A 1C 1E **), xmmD=(11 13 15 17 19 1B 1D 1F **)
        ; xmmE=(20 22 24 26 28 2A 2C 2E **), xmmF=(21 23 25 27 29 2B 2D 2F **)
        ; xmmG=(** ** ** ** ** ** ** ** **), xmmH=(** ** ** ** ** ** ** ** **)

        punpcklbw xmmA,xmmC     ; xmmA=(00 10 02 12 04 14 06 16 08 18 0A 1A 0C 1C 0E 1E)
        punpcklbw xmmE,xmmB     ; xmmE=(20 01 22 03 24 05 26 07 28 09 2A 0B 2C 0D 2E 0F)
        punpcklbw xmmD,xmmF     ; xmmD=(11 21 13 23 15 25 17 27 19 29 1B 2B 1D 2D 1F 2F)

        movdqa    xmmG,xmmA
        movdqa    xmmH,xmmA
        punpcklwd xmmA,xmmE     ; xmmA=(00 10 20 01 02 12 22 03 04 14 24 05 06 16 26 07)
        punpckhwd xmmG,xmmE     ; xmmG=(08 18 28 09 0A 1A 2A 0B 0C 1C 2C 0D 0E 1E 2E 0F)

        psrldq    xmmH,2        ; xmmH=(02 12 04 14 06 16 08 18 0A 1A 0C 1C 0E 1E -- --)
        psrldq    xmmE,2        ; xmmE=(22 03 24 05 26 07 28 09 2A 0B 2C 0D 2E 0F -- --)

        movdqa    xmmC,xmmD
        movdqa    xmmB,xmmD
        punpcklwd xmmD,xmmH     ; xmmD=(11 21 02 12 13 23 04 14 15 25 06 16 17 27 08 18)
        punpckhwd xmmC,xmmH     ; xmmC=(19 29 0A 1A 1B 2B 0C 1C 1D 2D 0E 1E 1F 2F -- --)

        psrldq    xmmB,2        ; xmmB=(13 23 15 25 17 27 19 29 1B 2B 1D 2D 1F 2F -- --)

        movdqa    xmmF,xmmE
        punpcklwd xmmE,xmmB     ; xmmE=(22 03 13 23 24 05 15 25 26 07 17 27 28 09 19 29)
        punpckhwd xmmF,xmmB     ; xmmF=(2A 0B 1B 2B 2C 0D 1D 2D 2E 0F 1F 2F -- -- -- --)

        pshufd    xmmH,xmmA,0x4E; xmmH=(04 14 24 05 06 16 26 07 00 10 20 01 02 12 22 03)
        movdqa    xmmB,xmmE
        punpckldq xmmA,xmmD     ; xmmA=(00 10 20 01 11 21 02 12 02 12 22 03 13 23 04 14)
        punpckldq xmmE,xmmH     ; xmmE=(22 03 13 23 04 14 24 05 24 05 15 25 06 16 26 07)
        punpckhdq xmmD,xmmB     ; xmmD=(15 25 06 16 26 07 17 27 17 27 08 18 28 09 19 29)

        pshufd    xmmH,xmmG,0x4E; xmmH=(0C 1C 2C 0D 0E 1E 2E 0F 08 18 28 09 0A 1A 2A 0B)
        movdqa    xmmB,xmmF
        punpckldq xmmG,xmmC     ; xmmG=(08 18 28 09 19 29 0A 1A 0A 1A 2A 0B 1B 2B 0C 1C)
        punpckldq xmmF,xmmH     ; xmmF=(2A 0B 1B 2B 0C 1C 2C 0D 2C 0D 1D 2D 0E 1E 2E 0F)
        punpckhdq xmmC,xmmB     ; xmmC=(1D 2D 0E 1E 2E 0F 1F 2F 1F 2F -- -- -- -- -- --)

        punpcklqdq xmmA,xmmE    ; xmmA=(00 10 20 01 11 21 02 12 22 03 13 23 04 14 24 05)
        punpcklqdq xmmD,xmmG    ; xmmD=(15 25 06 16 26 07 17 27 08 18 28 09 19 29 0A 1A)
        punpcklqdq xmmF,xmmC    ; xmmF=(2A 0B 1B 2B 0C 1C 2C 0D 1D 2D 0E 1E 2E 0F 1F 2F)

        cmp     ecx, byte SIZEOF_XMMWORD
        jb      short .column_st32

        test    edi, SIZEOF_XMMWORD-1
        jnz     short .out1
        ; --(aligned)-------------------
        movntdq XMMWORD [edi+0*SIZEOF_XMMWORD], xmmA
        movntdq XMMWORD [edi+1*SIZEOF_XMMWORD], xmmD
        movntdq XMMWORD [edi+2*SIZEOF_XMMWORD], xmmF
        jmp     short .out0
.out1:  ; --(unaligned)-----------------
        movdqu  XMMWORD [edi+0*SIZEOF_XMMWORD], xmmA
        movdqu  XMMWORD [edi+1*SIZEOF_XMMWORD], xmmD
        movdqu  XMMWORD [edi+2*SIZEOF_XMMWORD], xmmF
.out0:
        add     edi, byte RGB_PIXELSIZE*SIZEOF_XMMWORD  ; outptr
        sub     ecx, byte SIZEOF_XMMWORD
        jz      near .endcolumn

        add     esi, byte SIZEOF_XMMWORD        ; inptr0
        dec     al                      ; Yctr
        jnz     near .Yloop_2nd

        add     ebx, byte SIZEOF_XMMWORD        ; inptr1
        add     edx, byte SIZEOF_XMMWORD        ; inptr2
        jmp     near .columnloop
        alignx  16,7

.column_st32:
        lea     ecx, [ecx+ecx*2]                ; imul ecx, RGB_PIXELSIZE
        cmp     ecx, byte 2*SIZEOF_XMMWORD
        jb      short .column_st16
        movdqu  XMMWORD [edi+0*SIZEOF_XMMWORD], xmmA
        movdqu  XMMWORD [edi+1*SIZEOF_XMMWORD], xmmD
        add     edi, byte 2*SIZEOF_XMMWORD      ; outptr
        movdqa  xmmA,xmmF
        sub     ecx, byte 2*SIZEOF_XMMWORD
        jmp     short .column_st15
.column_st16:
        cmp     ecx, byte SIZEOF_XMMWORD
        jb      short .column_st15
        movdqu  XMMWORD [edi+0*SIZEOF_XMMWORD], xmmA
        add     edi, byte SIZEOF_XMMWORD        ; outptr
        movdqa  xmmA,xmmD
        sub     ecx, byte SIZEOF_XMMWORD
.column_st15:
        ; Store the lower 8 bytes of xmmA to the output when it has enough
        ; space.
        cmp     ecx, byte SIZEOF_MMWORD
        jb      short .column_st7
        movq    XMM_MMWORD [edi], xmmA
        add     edi, byte SIZEOF_MMWORD
        sub     ecx, byte SIZEOF_MMWORD
        psrldq  xmmA, SIZEOF_MMWORD
.column_st7:
        ; Store the lower 4 bytes of xmmA to the output when it has enough
        ; space.
        cmp     ecx, byte SIZEOF_DWORD
        jb      short .column_st3
        movd    XMM_DWORD [edi], xmmA
        add     edi, byte SIZEOF_DWORD
        sub     ecx, byte SIZEOF_DWORD
        psrldq  xmmA, SIZEOF_DWORD
.column_st3:
        ; Store the lower 2 bytes of eax to the output when it has enough
        ; space.
        movd    eax, xmmA
        cmp     ecx, byte SIZEOF_WORD
        jb      short .column_st1
        mov     WORD [edi], ax
        add     edi, byte SIZEOF_WORD
        sub     ecx, byte SIZEOF_WORD
        shr     eax, 16
.column_st1:
        ; Store the lower 1 byte of eax to the output when it has enough
        ; space.
        test    ecx, ecx
        jz      short .endcolumn
        mov     BYTE [edi], al

%else ; RGB_PIXELSIZE == 4 ; -----------

%ifdef RGBX_FILLER_0XFF
        pcmpeqb   xmm6,xmm6             ; xmm6=XE=X(02468ACE********)
        pcmpeqb   xmm7,xmm7             ; xmm7=XO=X(13579BDF********)
%else
        pxor      xmm6,xmm6             ; xmm6=XE=X(02468ACE********)
        pxor      xmm7,xmm7             ; xmm7=XO=X(13579BDF********)
%endif
        ; xmmA=(00 02 04 06 08 0A 0C 0E **), xmmB=(01 03 05 07 09 0B 0D 0F **)
        ; xmmC=(10 12 14 16 18 1A 1C 1E **), xmmD=(11 13 15 17 19 1B 1D 1F **)
        ; xmmE=(20 22 24 26 28 2A 2C 2E **), xmmF=(21 23 25 27 29 2B 2D 2F **)
        ; xmmG=(30 32 34 36 38 3A 3C 3E **), xmmH=(31 33 35 37 39 3B 3D 3F **)

        punpcklbw xmmA,xmmC     ; xmmA=(00 10 02 12 04 14 06 16 08 18 0A 1A 0C 1C 0E 1E)
        punpcklbw xmmE,xmmG     ; xmmE=(20 30 22 32 24 34 26 36 28 38 2A 3A 2C 3C 2E 3E)
        punpcklbw xmmB,xmmD     ; xmmB=(01 11 03 13 05 15 07 17 09 19 0B 1B 0D 1D 0F 1F)
        punpcklbw xmmF,xmmH     ; xmmF=(21 31 23 33 25 35 27 37 29 39 2B 3B 2D 3D 2F 3F)

        movdqa    xmmC,xmmA
        punpcklwd xmmA,xmmE     ; xmmA=(00 10 20 30 02 12 22 32 04 14 24 34 06 16 26 36)
        punpckhwd xmmC,xmmE     ; xmmC=(08 18 28 38 0A 1A 2A 3A 0C 1C 2C 3C 0E 1E 2E 3E)
        movdqa    xmmG,xmmB
        punpcklwd xmmB,xmmF     ; xmmB=(01 11 21 31 03 13 23 33 05 15 25 35 07 17 27 37)
        punpckhwd xmmG,xmmF     ; xmmG=(09 19 29 39 0B 1B 2B 3B 0D 1D 2D 3D 0F 1F 2F 3F)

        movdqa    xmmD,xmmA
        punpckldq xmmA,xmmB     ; xmmA=(00 10 20 30 01 11 21 31 02 12 22 32 03 13 23 33)
        punpckhdq xmmD,xmmB     ; xmmD=(04 14 24 34 05 15 25 35 06 16 26 36 07 17 27 37)
        movdqa    xmmH,xmmC
        punpckldq xmmC,xmmG     ; xmmC=(08 18 28 38 09 19 29 39 0A 1A 2A 3A 0B 1B 2B 3B)
        punpckhdq xmmH,xmmG     ; xmmH=(0C 1C 2C 3C 0D 1D 2D 3D 0E 1E 2E 3E 0F 1F 2F 3F)

        cmp     ecx, byte SIZEOF_XMMWORD
        jb      short .column_st32

        test    edi, SIZEOF_XMMWORD-1
        jnz     short .out1
        ; --(aligned)-------------------
        movntdq XMMWORD [edi+0*SIZEOF_XMMWORD], xmmA
        movntdq XMMWORD [edi+1*SIZEOF_XMMWORD], xmmD
        movntdq XMMWORD [edi+2*SIZEOF_XMMWORD], xmmC
        movntdq XMMWORD [edi+3*SIZEOF_XMMWORD], xmmH
        jmp     short .out0
.out1:  ; --(unaligned)-----------------
        movdqu  XMMWORD [edi+0*SIZEOF_XMMWORD], xmmA
        movdqu  XMMWORD [edi+1*SIZEOF_XMMWORD], xmmD
        movdqu  XMMWORD [edi+2*SIZEOF_XMMWORD], xmmC
        movdqu  XMMWORD [edi+3*SIZEOF_XMMWORD], xmmH
.out0:
        add     edi, byte RGB_PIXELSIZE*SIZEOF_XMMWORD  ; outptr
        sub     ecx, byte SIZEOF_XMMWORD
        jz      near .endcolumn

        add     esi, byte SIZEOF_XMMWORD        ; inptr0
        dec     al                      ; Yctr
        jnz     near .Yloop_2nd

        add     ebx, byte SIZEOF_XMMWORD        ; inptr1
        add     edx, byte SIZEOF_XMMWORD        ; inptr2
        jmp     near .columnloop
        alignx  16,7

.column_st32:
        cmp     ecx, byte SIZEOF_XMMWORD/2
        jb      short .column_st16
        movdqu  XMMWORD [edi+0*SIZEOF_XMMWORD], xmmA
        movdqu  XMMWORD [edi+1*SIZEOF_XMMWORD], xmmD
        add     edi, byte 2*SIZEOF_XMMWORD      ; outptr
        movdqa  xmmA,xmmC
        movdqa  xmmD,xmmH
        sub     ecx, byte SIZEOF_XMMWORD/2
.column_st16:
        cmp     ecx, byte SIZEOF_XMMWORD/4
        jb      short .column_st15
        movdqu  XMMWORD [edi+0*SIZEOF_XMMWORD], xmmA
        add     edi, byte SIZEOF_XMMWORD        ; outptr
        movdqa  xmmA,xmmD
        sub     ecx, byte SIZEOF_XMMWORD/4
.column_st15:
        ; Store two pixels (8 bytes) of xmmA to the output when it has enough
        ; space.
        cmp     ecx, byte SIZEOF_XMMWORD/8
        jb      short .column_st7
        movq    XMM_MMWORD [edi], xmmA
        add     edi, byte SIZEOF_XMMWORD/8*4
        sub     ecx, byte SIZEOF_XMMWORD/8
        psrldq  xmmA, SIZEOF_XMMWORD/8*4
.column_st7:
        ; Store one pixel (4 bytes) of xmmA to the output when it has enough
        ; space.
        test    ecx, ecx
        jz      short .endcolumn
        movd    XMM_DWORD [edi], xmmA

%endif ; RGB_PIXELSIZE ; ---------------

.endcolumn:
        sfence          ; flush the write buffer

.return:
        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

; --------------------------------------------------------------------------
;
; Upsample and color convert for the case of 2:1 horizontal and 2:1 vertical.
;
; GLOBAL(void)
; jsimd_h2v2_merged_upsample_sse2 (JDIMENSION output_width,
;                                  JSAMPIMAGE input_buf,
;                                  JDIMENSION in_row_group_ctr,
;                                  JSAMPARRAY output_buf);
;

%define output_width(b) (b)+8                   ; JDIMENSION output_width
%define input_buf(b)            (b)+12          ; JSAMPIMAGE input_buf
%define in_row_group_ctr(b)     (b)+16          ; JDIMENSION in_row_group_ctr
%define output_buf(b)           (b)+20          ; JSAMPARRAY output_buf

        align   16
        global  EXTN(jsimd_h2v2_merged_upsample_sse2)

EXTN(jsimd_h2v2_merged_upsample_sse2):
        push    ebp
        mov     ebp,esp
        push    ebx
;       push    ecx             ; need not be preserved
;       push    edx             ; need not be preserved
        push    esi
        push    edi

        mov     eax, POINTER [output_width(ebp)]

        mov     edi, JSAMPIMAGE [input_buf(ebp)]
        mov     ecx, JDIMENSION [in_row_group_ctr(ebp)]
        mov     esi, JSAMPARRAY [edi+0*SIZEOF_JSAMPARRAY]
        mov     ebx, JSAMPARRAY [edi+1*SIZEOF_JSAMPARRAY]
        mov     edx, JSAMPARRAY [edi+2*SIZEOF_JSAMPARRAY]
        mov     edi, JSAMPARRAY [output_buf(ebp)]
        lea     esi, [esi+ecx*SIZEOF_JSAMPROW]

        push    edx                     ; inptr2
        push    ebx                     ; inptr1
        push    esi                     ; inptr00
        mov     ebx,esp

        push    edi                     ; output_buf (outptr0)
        push    ecx                     ; in_row_group_ctr
        push    ebx                     ; input_buf
        push    eax                     ; output_width

        call    near EXTN(jsimd_h2v1_merged_upsample_sse2)

        add     esi, byte SIZEOF_JSAMPROW       ; inptr01
        add     edi, byte SIZEOF_JSAMPROW       ; outptr1
        mov     POINTER [ebx+0*SIZEOF_POINTER], esi
        mov     POINTER [ebx-1*SIZEOF_POINTER], edi

        call    near EXTN(jsimd_h2v1_merged_upsample_sse2)

        add     esp, byte 7*SIZEOF_DWORD

        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