summaryrefslogtreecommitdiffstats
path: root/media/libjpeg/simd/x86_64/jcgryext-avx2.asm
blob: 175b60de613e69ff37d1b3e3a0fd99ac6f397ae9 (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
;
; jcgryext.asm - grayscale colorspace conversion (64-bit AVX2)
;
; Copyright (C) 2011, 2016, D. R. Commander.
; Copyright (C) 2015, Intel Corporation.
;
; 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

%include "jcolsamp.inc"

; --------------------------------------------------------------------------
;
; Convert some rows of samples to the output colorspace.
;
; GLOBAL(void)
; jsimd_rgb_gray_convert_avx2(JDIMENSION img_width, JSAMPARRAY input_buf,
;                             JSAMPIMAGE output_buf, JDIMENSION output_row,
;                             int num_rows);
;

; r10d = JDIMENSION img_width
; r11 = JSAMPARRAY input_buf
; r12 = JSAMPIMAGE output_buf
; r13d = JDIMENSION output_row
; r14d = int num_rows

%define wk(i)   rbp - (WK_NUM - (i)) * SIZEOF_YMMWORD  ; ymmword wk[WK_NUM]
%define WK_NUM  2

    align       32
    GLOBAL_FUNCTION(jsimd_rgb_gray_convert_avx2)

EXTN(jsimd_rgb_gray_convert_avx2):
    push        rbp
    mov         rax, rsp                     ; rax = original rbp
    sub         rsp, byte 4
    and         rsp, byte (-SIZEOF_YMMWORD)  ; align to 256 bits
    mov         [rsp], rax
    mov         rbp, rsp                     ; rbp = aligned rbp
    lea         rsp, [wk(0)]
    collect_args 5
    push        rbx

    mov         ecx, r10d
    test        rcx, rcx
    jz          near .return

    push        rcx

    mov         rsi, r12
    mov         ecx, r13d
    mov         rdi, JSAMPARRAY [rsi+0*SIZEOF_JSAMPARRAY]
    lea         rdi, [rdi+rcx*SIZEOF_JSAMPROW]

    pop         rcx

    mov         rsi, r11
    mov         eax, r14d
    test        rax, rax
    jle         near .return
.rowloop:
    push        rdi
    push        rsi
    push        rcx                     ; col

    mov         rsi, JSAMPROW [rsi]     ; inptr
    mov         rdi, JSAMPROW [rdi]     ; outptr0

    cmp         rcx, byte SIZEOF_YMMWORD
    jae         near .columnloop

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

.column_ld1:
    push        rax
    push        rdx
    lea         rcx, [rcx+rcx*2]        ; imul ecx,RGB_PIXELSIZE
    test        cl, SIZEOF_BYTE
    jz          short .column_ld2
    sub         rcx, byte SIZEOF_BYTE
    movzx       rax, byte [rsi+rcx]
.column_ld2:
    test        cl, SIZEOF_WORD
    jz          short .column_ld4
    sub         rcx, byte SIZEOF_WORD
    movzx       rdx, word [rsi+rcx]
    shl         rax, WORD_BIT
    or          rax, rdx
.column_ld4:
    vmovd       xmmA, eax
    pop         rdx
    pop         rax
    test        cl, SIZEOF_DWORD
    jz          short .column_ld8
    sub         rcx, byte SIZEOF_DWORD
    vmovd       xmmF, XMM_DWORD [rsi+rcx]
    vpslldq     xmmA, xmmA, SIZEOF_DWORD
    vpor        xmmA, xmmA, xmmF
.column_ld8:
    test        cl, SIZEOF_MMWORD
    jz          short .column_ld16
    sub         rcx, byte SIZEOF_MMWORD
    vmovq       xmmB, XMM_MMWORD [rsi+rcx]
    vpslldq     xmmA, xmmA, SIZEOF_MMWORD
    vpor        xmmA, xmmA, xmmB
.column_ld16:
    test        cl, SIZEOF_XMMWORD
    jz          short .column_ld32
    sub         rcx, byte SIZEOF_XMMWORD
    vmovdqu     xmmB, XMM_MMWORD [rsi+rcx]
    vperm2i128  ymmA, ymmA, ymmA, 1
    vpor        ymmA, ymmB
.column_ld32:
    test        cl, SIZEOF_YMMWORD
    jz          short .column_ld64
    sub         rcx, byte SIZEOF_YMMWORD
    vmovdqa     ymmF, ymmA
    vmovdqu     ymmA, YMMWORD [rsi+0*SIZEOF_YMMWORD]
.column_ld64:
    test        cl, 2*SIZEOF_YMMWORD
    mov         rcx, SIZEOF_YMMWORD
    jz          short .rgb_gray_cnv
    vmovdqa     ymmB, ymmA
    vmovdqu     ymmA, YMMWORD [rsi+0*SIZEOF_YMMWORD]
    vmovdqu     ymmF, YMMWORD [rsi+1*SIZEOF_YMMWORD]
    jmp         short .rgb_gray_cnv

.columnloop:
    vmovdqu     ymmA, YMMWORD [rsi+0*SIZEOF_YMMWORD]
    vmovdqu     ymmF, YMMWORD [rsi+1*SIZEOF_YMMWORD]
    vmovdqu     ymmB, YMMWORD [rsi+2*SIZEOF_YMMWORD]

.rgb_gray_cnv:
    ; ymmA=(00 10 20 01 11 21 02 12 22 03 13 23 04 14 24 05
    ;       15 25 06 16 26 07 17 27 08 18 28 09 19 29 0A 1A)
    ; ymmF=(2A 0B 1B 2B 0C 1C 2C 0D 1D 2D 0E 1E 2E 0F 1F 2F
    ;       0G 1G 2G 0H 1H 2H 0I 1I 2I 0J 1J 2J 0K 1K 2K 0L)
    ; ymmB=(1L 2L 0M 1M 2M 0N 1N 2N 0O 1O 2O 0P 1P 2P 0Q 1Q
    ;       2Q 0R 1R 2R 0S 1S 2S 0T 1T 2T 0U 1U 2U 0V 1V 2V)

    vmovdqu     ymmC, ymmA
    vinserti128 ymmA, ymmF, xmmA, 0  ; ymmA=(00 10 20 01 11 21 02 12 22 03 13 23 04 14 24 05
                                     ;       0G 1G 2G 0H 1H 2H 0I 1I 2I 0J 1J 2J 0K 1K 2K 0L)
    vinserti128 ymmC, ymmC, xmmB, 0  ; ymmC=(1L 2L 0M 1M 2M 0N 1N 2N 0O 1O 2O 0P 1P 2P 0Q 1Q
                                     ;       15 25 06 16 26 07 17 27 08 18 28 09 19 29 0A 1A)
    vinserti128 ymmB, ymmB, xmmF, 0  ; ymmB=(2A 0B 1B 2B 0C 1C 2C 0D 1D 2D 0E 1E 2E 0F 1F 2F
                                     ;       2Q 0R 1R 2R 0S 1S 2S 0T 1T 2T 0U 1U 2U 0V 1V 2V)
    vperm2i128  ymmF, ymmC, ymmC, 1  ; ymmF=(15 25 06 16 26 07 17 27 08 18 28 09 19 29 0A 1A
                                     ;       1L 2L 0M 1M 2M 0N 1N 2N 0O 1O 2O 0P 1P 2P 0Q 1Q)

    vmovdqa     ymmG, ymmA
    vpslldq     ymmA, ymmA, 8     ; ymmA=(-- -- -- -- -- -- -- -- 00 10 20 01 11 21 02 12
                                  ;       22 03 13 23 04 14 24 05 0G 1G 2G 0H 1H 2H 0I 1I)
    vpsrldq     ymmG, ymmG, 8     ; ymmG=(22 03 13 23 04 14 24 05 0G 1G 2G 0H 1H 2H 0I 1I
                                  ;       2I 0J 1J 2J 0K 1K 2K 0L -- -- -- -- -- -- -- --)

    vpunpckhbw  ymmA, ymmA, ymmF  ; ymmA=(00 08 10 18 20 28 01 09 11 19 21 29 02 0A 12 1A
                                  ;       0G 0O 1G 1O 2G 2O 0H 0P 1H 1P 2H 2P 0I 0Q 1I 1Q)
    vpslldq     ymmF, ymmF, 8     ; ymmF=(-- -- -- -- -- -- -- -- 15 25 06 16 26 07 17 27
                                  ;       08 18 28 09 19 29 0A 1A 1L 2L 0M 1M 2M 0N 1N 2N)

    vpunpcklbw  ymmG, ymmG, ymmB  ; ymmG=(22 2A 03 0B 13 1B 23 2B 04 0C 14 1C 24 2C 05 0D
                                  ;       2I 2Q 0J 0R 1J 1R 2J 2R 0K 0S 1K 1S 2K 2S 0L 0T)
    vpunpckhbw  ymmF, ymmF, ymmB  ; ymmF=(15 1D 25 2D 06 0E 16 1E 26 2E 07 0F 17 1F 27 2F
                                  ;       1L 1T 2L 2T 0M 0U 1M 1U 2M 2U 0N 0V 1N 1V 2N 2V)

    vmovdqa     ymmD, ymmA
    vpslldq     ymmA, ymmA, 8     ; ymmA=(-- -- -- -- -- -- -- -- 00 08 10 18 20 28 01 09
                                  ;       11 19 21 29 02 0A 12 1A 0G 0O 1G 1O 2G 2O 0H 0P)
    vpsrldq     ymmD, ymmD, 8     ; ymmD=(11 19 21 29 02 0A 12 1A 0G 0O 1G 1O 2G 2O 0H 0P
                                  ;       1H 1P 2H 2P 0I 0Q 1I 1Q -- -- -- -- -- -- -- --)

    vpunpckhbw  ymmA, ymmA, ymmG  ; ymmA=(00 04 08 0C 10 14 18 1C 20 24 28 2C 01 05 09 0D
                                  ;       0G 0K 0O 0S 1G 1K 1O 1S 2G 2K 2O 2S 0H 0L 0P 0T)
    vpslldq     ymmG, ymmG, 8     ; ymmG=(-- -- -- -- -- -- -- -- 22 2A 03 0B 13 1B 23 2B
                                  ;       04 0C 14 1C 24 2C 05 0D 2I 2Q 0J 0R 1J 1R 2J 2R)

    vpunpcklbw  ymmD, ymmD, ymmF  ; ymmD=(11 15 19 1D 21 25 29 2D 02 06 0A 0E 12 16 1A 1E
                                  ;       1H 1L 1P 1T 2H 2L 2P 2T 0I 0M 0Q 0U 1I 1M 1Q 1U)
    vpunpckhbw  ymmG, ymmG, ymmF  ; ymmG=(22 26 2A 2E 03 07 0B 0F 13 17 1B 1F 23 27 2B 2F
                                  ;       2I 2M 2Q 2U 0J 0N 0R 0V 1J 1N 1R 1V 2J 2N 2R 2V)

    vmovdqa     ymmE, ymmA
    vpslldq     ymmA, ymmA, 8     ; ymmA=(-- -- -- -- -- -- -- -- 00 04 08 0C 10 14 18 1C
                                  ;       20 24 28 2C 01 05 09 0D 0G 0K 0O 0S 1G 1K 1O 1S)
    vpsrldq     ymmE, ymmE, 8     ; ymmE=(20 24 28 2C 01 05 09 0D 0G 0K 0O 0S 1G 1K 1O 1S
                                  ;       2G 2K 2O 2S 0H 0L 0P 0T -- -- -- -- -- -- -- --)

    vpunpckhbw  ymmA, ymmA, ymmD  ; ymmA=(00 02 04 06 08 0A 0C 0E 10 12 14 16 18 1A 1C 1E
                                  ;       0G 0I 0K 0M 0O 0Q 0S 0U 1G 1I 1K 1M 1O 1Q 1S 1U)
    vpslldq     ymmD, ymmD, 8     ; ymmD=(-- -- -- -- -- -- -- -- 11 15 19 1D 21 25 29 2D
                                  ;       02 06 0A 0E 12 16 1A 1E 1H 1L 1P 1T 2H 2L 2P 2T)

    vpunpcklbw  ymmE, ymmE, ymmG  ; ymmE=(20 22 24 26 28 2A 2C 2E 01 03 05 07 09 0B 0D 0F
                                  ;       2G 2I 2K 2M 2O 2Q 2S 2U 0H 0J 0L 0N 0P 0R 0T 0V)
    vpunpckhbw  ymmD, ymmD, ymmG  ; ymmD=(11 13 15 17 19 1B 1D 1F 21 23 25 27 29 2B 2D 2F
                                  ;       1H 1J 1L 1N 1P 1R 1T 1V 2H 2J 2L 2N 2P 2R 2T 2V)

    vpxor       ymmH, ymmH, ymmH

    vmovdqa     ymmC, ymmA
    vpunpcklbw  ymmA, ymmA, ymmH  ; ymmA=(00 02 04 06 08 0A 0C 0E 0G 0I 0K 0M 0O 0Q 0S 0U)
    vpunpckhbw  ymmC, ymmC, ymmH  ; ymmC=(10 12 14 16 18 1A 1C 1E 1G 1I 1K 1M 1O 1Q 1S 1U)

    vmovdqa     ymmB, ymmE
    vpunpcklbw  ymmE, ymmE, ymmH  ; ymmE=(20 22 24 26 28 2A 2C 2E 2G 2I 2K 2M 2O 2Q 2S 2U)
    vpunpckhbw  ymmB, ymmB, ymmH  ; ymmB=(01 03 05 07 09 0B 0D 0F 0H 0J 0L 0N 0P 0R 0T 0V)

    vmovdqa     ymmF, ymmD
    vpunpcklbw  ymmD, ymmD, ymmH  ; ymmD=(11 13 15 17 19 1B 1D 1F 1H 1J 1L 1N 1P 1R 1T 1V)
    vpunpckhbw  ymmF, ymmF, ymmH  ; ymmF=(21 23 25 27 29 2B 2D 2F 2H 2J 2L 2N 2P 2R 2T 2V)

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

.column_ld1:
    test        cl, SIZEOF_XMMWORD/16
    jz          short .column_ld2
    sub         rcx, byte SIZEOF_XMMWORD/16
    vmovd       xmmA, XMM_DWORD [rsi+rcx*RGB_PIXELSIZE]
.column_ld2:
    test        cl, SIZEOF_XMMWORD/8
    jz          short .column_ld4
    sub         rcx, byte SIZEOF_XMMWORD/8
    vmovq       xmmF, XMM_MMWORD [rsi+rcx*RGB_PIXELSIZE]
    vpslldq     xmmA, xmmA, SIZEOF_MMWORD
    vpor        xmmA, xmmA, xmmF
.column_ld4:
    test        cl, SIZEOF_XMMWORD/4
    jz          short .column_ld8
    sub         rcx, byte SIZEOF_XMMWORD/4
    vmovdqa     xmmF, xmmA
    vperm2i128  ymmF, ymmF, ymmF, 1
    vmovdqu     xmmA, XMMWORD [rsi+rcx*RGB_PIXELSIZE]
    vpor        ymmA, ymmA, ymmF
.column_ld8:
    test        cl, SIZEOF_XMMWORD/2
    jz          short .column_ld16
    sub         rcx, byte SIZEOF_XMMWORD/2
    vmovdqa     ymmF, ymmA
    vmovdqu     ymmA, YMMWORD [rsi+rcx*RGB_PIXELSIZE]
.column_ld16:
    test        cl, SIZEOF_XMMWORD
    mov         rcx, SIZEOF_YMMWORD
    jz          short .rgb_gray_cnv
    vmovdqa     ymmE, ymmA
    vmovdqa     ymmH, ymmF
    vmovdqu     ymmA, YMMWORD [rsi+0*SIZEOF_YMMWORD]
    vmovdqu     ymmF, YMMWORD [rsi+1*SIZEOF_YMMWORD]
    jmp         short .rgb_gray_cnv

.columnloop:
    vmovdqu     ymmA, YMMWORD [rsi+0*SIZEOF_YMMWORD]
    vmovdqu     ymmF, YMMWORD [rsi+1*SIZEOF_YMMWORD]
    vmovdqu     ymmE, YMMWORD [rsi+2*SIZEOF_YMMWORD]
    vmovdqu     ymmH, YMMWORD [rsi+3*SIZEOF_YMMWORD]

.rgb_gray_cnv:
    ; ymmA=(00 10 20 30 01 11 21 31 02 12 22 32 03 13 23 33
    ;       04 14 24 34 05 15 25 35 06 16 26 36 07 17 27 37)
    ; ymmF=(08 18 28 38 09 19 29 39 0A 1A 2A 3A 0B 1B 2B 3B
    ;       0C 1C 2C 3C 0D 1D 2D 3D 0E 1E 2E 3E 0F 1F 2F 3F)
    ; ymmE=(0G 1G 2G 3G 0H 1H 2H 3H 0I 1I 2I 3I 0J 1J 2J 3J
    ;       0K 1K 2K 3K 0L 1L 2L 3L 0M 1M 2M 3M 0N 1N 2N 3N)
    ; ymmH=(0O 1O 2O 3O 0P 1P 2P 3P 0Q 1Q 2Q 3Q 0R 1R 2R 3R
    ;       0S 1S 2S 3S 0T 1T 2T 3T 0U 1U 2U 3U 0V 1V 2V 3V)

    vmovdqa     ymmB, ymmA
    vinserti128 ymmA, ymmA, xmmE, 1     ; ymmA=(00 10 20 30 01 11 21 31 02 12 22 32 03 13 23 33
                                        ;       0G 1G 2G 3G 0H 1H 2H 3H 0I 1I 2I 3I 0J 1J 2J 3J)
    vperm2i128  ymmE, ymmB, ymmE, 0x31  ; ymmE=(04 14 24 34 05 15 25 35 06 16 26 36 07 17 27 37
                                        ;       0K 1K 2K 3K 0L 1L 2L 3L 0M 1M 2M 3M 0N 1N 2N 3N)

    vmovdqa     ymmB, ymmF
    vinserti128 ymmF, ymmF, xmmH, 1     ; ymmF=(08 18 28 38 09 19 29 39 0A 1A 2A 3A 0B 1B 2B 3B
                                        ;       0O 1O 2O 3O 0P 1P 2P 3P 0Q 1Q 2Q 3Q 0R 1R 2R 3R)
    vperm2i128  ymmH, ymmB, ymmH, 0x31  ; ymmH=(0C 1C 2C 3C 0D 1D 2D 3D 0E 1E 2E 3E 0F 1F 2F 3F
                                        ;       0S 1S 2S 3S 0T 1T 2T 3T 0U 1U 2U 3U 0V 1V 2V 3V)

    vmovdqa     ymmD, ymmA
    vpunpcklbw  ymmA, ymmA, ymmE      ; ymmA=(00 04 10 14 20 24 30 34 01 05 11 15 21 25 31 35
                                      ;       0G 0K 1G 1K 2G 2K 3G 3K 0H 0L 1H 1L 2H 2L 3H 3L)
    vpunpckhbw  ymmD, ymmD, ymmE      ; ymmD=(02 06 12 16 22 26 32 36 03 07 13 17 23 27 33 37
                                      ;       0I 0M 1I 1M 2I 2M 3I 3M 0J 0N 1J 1N 2J 2N 3J 3N)

    vmovdqa     ymmC, ymmF
    vpunpcklbw  ymmF, ymmF, ymmH      ; ymmF=(08 0C 18 1C 28 2C 38 3C 09 0D 19 1D 29 2D 39 3D
                                      ;       0O 0S 1O 1S 2O 2S 3O 3S 0P 0T 1P 1T 2P 2T 3P 3T)
    vpunpckhbw  ymmC, ymmC, ymmH      ; ymmC=(0A 0E 1A 1E 2A 2E 3A 3E 0B 0F 1B 1F 2B 2F 3B 3F
                                      ;       0Q 0U 1Q 1U 2Q 2U 3Q 3U 0R 0V 1R 1V 2R 2V 3R 3V)

    vmovdqa     ymmB, ymmA
    vpunpcklwd  ymmA, ymmA, ymmF      ; ymmA=(00 04 08 0C 10 14 18 1C 20 24 28 2C 30 34 38 3C
                                      ;       0G 0K 0O 0S 1G 1K 1O 1S 2G 2K 2O 2S 3G 3K 3O 3S)
    vpunpckhwd  ymmB, ymmB, ymmF      ; ymmB=(01 05 09 0D 11 15 19 1D 21 25 29 2D 31 35 39 3D
                                      ;       0H 0L 0P 0T 1H 1L 1P 1T 2H 2L 2P 2T 3H 3L 3P 3T)

    vmovdqa     ymmG, ymmD
    vpunpcklwd  ymmD, ymmD, ymmC      ; ymmD=(02 06 0A 0E 12 16 1A 1E 22 26 2A 2E 32 36 3A 3E
                                      ;       0I 0M 0Q 0U 1I 1M 1Q 1U 2I 2M 2Q 2U 3I 3M 3Q 3U)
    vpunpckhwd  ymmG, ymmG, ymmC      ; ymmG=(03 07 0B 0F 13 17 1B 1F 23 27 2B 2F 33 37 3B 3F
                                      ;       0J 0N 0R 0V 1J 1N 1R 1V 2J 2N 2R 2V 3J 3N 3R 3V)

    vmovdqa     ymmE, ymmA
    vpunpcklbw  ymmA, ymmA, ymmD      ; ymmA=(00 02 04 06 08 0A 0C 0E 10 12 14 16 18 1A 1C 1E
                                      ;       0G 0I 0K 0M 0O 0Q 0S 0U 1G 1I 1K 1M 1O 1Q 1S 1U)
    vpunpckhbw  ymmE, ymmE, ymmD      ; ymmE=(20 22 24 26 28 2A 2C 2E 30 32 34 36 38 3A 3C 3E
                                      ;       2G 2I 2K 2M 2O 2Q 2S 2U 3G 3I 3K 3M 3O 3Q 3S 3U)

    vmovdqa     ymmH, ymmB
    vpunpcklbw  ymmB, ymmB, ymmG      ; ymmB=(01 03 05 07 09 0B 0D 0F 11 13 15 17 19 1B 1D 1F
                                      ;       0H 0J 0L 0N 0P 0R 0T 0V 1H 1J 1L 1N 1P 1R 1T 1V)
    vpunpckhbw  ymmH, ymmH, ymmG      ; ymmH=(21 23 25 27 29 2B 2D 2F 31 33 35 37 39 3B 3D 3F
                                      ;       2H 2J 2L 2N 2P 2R 2T 2V 3H 3J 3L 3N 3P 3R 3T 3V)

    vpxor       ymmF, ymmF, ymmF

    vmovdqa     ymmC, ymmA
    vpunpcklbw  ymmA, ymmA, ymmF      ; ymmA=(00 02 04 06 08 0A 0C 0E 0G 0I 0K 0M 0O 0Q 0S 0U)
    vpunpckhbw  ymmC, ymmC, ymmF      ; ymmC=(10 12 14 16 18 1A 1C 1E 1G 1I 1K 1M 1O 1Q 1S 1U)

    vmovdqa     ymmD, ymmB
    vpunpcklbw  ymmB, ymmB, ymmF      ; ymmB=(01 03 05 07 09 0B 0D 0F 0H 0J 0L 0N 0P 0R 0T 0V)
    vpunpckhbw  ymmD, ymmD, ymmF      ; ymmD=(11 13 15 17 19 1B 1D 1F 1H 1J 1L 1N 1P 1R 1T 1V)

    vmovdqa     ymmG, ymmE
    vpunpcklbw  ymmE, ymmE, ymmF      ; ymmE=(20 22 24 26 28 2A 2C 2E 2G 2I 2K 2M 2O 2Q 2S 2U)
    vpunpckhbw  ymmG, ymmG, ymmF      ; ymmG=(30 32 34 36 38 3A 3C 3E 3G 3I 3K 3M 3O 3Q 3S 3U)

    vpunpcklbw  ymmF, ymmF, ymmH
    vpunpckhbw  ymmH, ymmH, ymmH
    vpsrlw      ymmF, ymmF, BYTE_BIT  ; ymmF=(21 23 25 27 29 2B 2D 2F 2H 2J 2L 2N 2P 2R 2T 2V)
    vpsrlw      ymmH, ymmH, BYTE_BIT  ; ymmH=(31 33 35 37 39 3B 3D 3F 3H 3J 3L 3N 3P 3R 3T 3V)

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

    ; ymm0=R(02468ACEGIKMOQSU)=RE, ymm2=G(02468ACEGIKMOQSU)=GE, ymm4=B(02468ACEGIKMOQSU)=BE
    ; ymm1=R(13579BDFHJLNPRTV)=RO, ymm3=G(13579BDFHJLNPRTV)=GO, ymm5=B(13579BDFHJLNPRTV)=BO

    ; (Original)
    ; Y  =  0.29900 * R + 0.58700 * G + 0.11400 * B
    ;
    ; (This implementation)
    ; Y  =  0.29900 * R + 0.33700 * G + 0.11400 * B + 0.25000 * G

    vmovdqa     ymm6, ymm1
    vpunpcklwd  ymm1, ymm1, ymm3
    vpunpckhwd  ymm6, ymm6, ymm3
    vpmaddwd    ymm1, ymm1, [rel PW_F0299_F0337]  ; ymm1=ROL*FIX(0.299)+GOL*FIX(0.337)
    vpmaddwd    ymm6, ymm6, [rel PW_F0299_F0337]  ; ymm6=ROH*FIX(0.299)+GOH*FIX(0.337)

    vmovdqa     ymm7, ymm6              ; ymm7=ROH*FIX(0.299)+GOH*FIX(0.337)

    vmovdqa     ymm6, ymm0
    vpunpcklwd  ymm0, ymm0, ymm2
    vpunpckhwd  ymm6, ymm6, ymm2
    vpmaddwd    ymm0, ymm0, [rel PW_F0299_F0337]  ; ymm0=REL*FIX(0.299)+GEL*FIX(0.337)
    vpmaddwd    ymm6, ymm6, [rel PW_F0299_F0337]  ; ymm6=REH*FIX(0.299)+GEH*FIX(0.337)

    vmovdqa     YMMWORD [wk(0)], ymm0   ; wk(0)=REL*FIX(0.299)+GEL*FIX(0.337)
    vmovdqa     YMMWORD [wk(1)], ymm6   ; wk(1)=REH*FIX(0.299)+GEH*FIX(0.337)

    vmovdqa     ymm0, ymm5              ; ymm0=BO
    vmovdqa     ymm6, ymm4              ; ymm6=BE

    vmovdqa     ymm4, ymm0
    vpunpcklwd  ymm0, ymm0, ymm3
    vpunpckhwd  ymm4, ymm4, ymm3
    vpmaddwd    ymm0, ymm0, [rel PW_F0114_F0250]  ; ymm0=BOL*FIX(0.114)+GOL*FIX(0.250)
    vpmaddwd    ymm4, ymm4, [rel PW_F0114_F0250]  ; ymm4=BOH*FIX(0.114)+GOH*FIX(0.250)

    vmovdqa     ymm3, [rel PD_ONEHALF]            ; ymm3=[PD_ONEHALF]

    vpaddd      ymm0, ymm0, ymm1
    vpaddd      ymm4, ymm4, ymm7
    vpaddd      ymm0, ymm0, ymm3
    vpaddd      ymm4, ymm4, ymm3
    vpsrld      ymm0, ymm0, SCALEBITS   ; ymm0=YOL
    vpsrld      ymm4, ymm4, SCALEBITS   ; ymm4=YOH
    vpackssdw   ymm0, ymm0, ymm4        ; ymm0=YO

    vmovdqa     ymm4, ymm6
    vpunpcklwd  ymm6, ymm6, ymm2
    vpunpckhwd  ymm4, ymm4, ymm2
    vpmaddwd    ymm6, ymm6, [rel PW_F0114_F0250]  ; ymm6=BEL*FIX(0.114)+GEL*FIX(0.250)
    vpmaddwd    ymm4, ymm4, [rel PW_F0114_F0250]  ; ymm4=BEH*FIX(0.114)+GEH*FIX(0.250)

    vmovdqa     ymm2, [rel PD_ONEHALF]            ; ymm2=[PD_ONEHALF]

    vpaddd      ymm6, ymm6, YMMWORD [wk(0)]
    vpaddd      ymm4, ymm4, YMMWORD [wk(1)]
    vpaddd      ymm6, ymm6, ymm2
    vpaddd      ymm4, ymm4, ymm2
    vpsrld      ymm6, ymm6, SCALEBITS   ; ymm6=YEL
    vpsrld      ymm4, ymm4, SCALEBITS   ; ymm4=YEH
    vpackssdw   ymm6, ymm6, ymm4        ; ymm6=YE

    vpsllw      ymm0, ymm0, BYTE_BIT
    vpor        ymm6, ymm6, ymm0        ; ymm6=Y
    vmovdqu     YMMWORD [rdi], ymm6     ; Save Y

    sub         rcx, byte SIZEOF_YMMWORD
    add         rsi, RGB_PIXELSIZE*SIZEOF_YMMWORD  ; inptr
    add         rdi, byte SIZEOF_YMMWORD           ; outptr0
    cmp         rcx, byte SIZEOF_YMMWORD
    jae         near .columnloop
    test        rcx, rcx
    jnz         near .column_ld1

    pop         rcx                     ; col
    pop         rsi
    pop         rdi

    add         rsi, byte SIZEOF_JSAMPROW  ; input_buf
    add         rdi, byte SIZEOF_JSAMPROW
    dec         rax                        ; num_rows
    jg          near .rowloop

.return:
    pop         rbx
    vzeroupper
    uncollect_args 5
    mov         rsp, rbp                ; rsp <- aligned rbp
    pop         rsp                     ; rsp <- original rbp
    pop         rbp
    ret

; For some reason, the OS X linker does not honor the request to align the
; segment unless we do this.
    align       32