2 ; jdmrgext.asm - merged upsampling/color conversion (64-bit SSE2)
4 ; Copyright 2009, 2012 Pierre Ossman <ossman@cendio.se> for Cendio AB
5 ; Copyright (C) 2009, 2012, 2016, D. R. Commander.
6 ; Copyright (C) 2018, Matthias Räncker.
8 ; Based on the x86 SIMD extension for IJG JPEG library
9 ; Copyright (C) 1999-2006, MIYASAKA Masaru.
10 ; For conditions of distribution and use, see copyright notice in jsimdext.inc
12 ; This file should be assembled with NASM (Netwide Assembler),
13 ; can *not* be assembled with Microsoft's MASM or any compatible
14 ; assembler (including Borland's Turbo Assembler).
15 ; NASM is available from http://nasm.sourceforge.net/ or
16 ; http://sourceforge.net/project/showfiles.php?group_id=6208
18 %include "jcolsamp.inc"
20 ; --------------------------------------------------------------------------
22 ; Upsample and color convert for the case of 2:1 horizontal and 1:1 vertical.
25 ; jsimd_h2v1_merged_upsample_sse2(JDIMENSION output_width,
26 ; JSAMPIMAGE input_buf,
27 ; JDIMENSION in_row_group_ctr,
28 ; JSAMPARRAY output_buf);
31 ; r10d = JDIMENSION output_width
32 ; r11 = JSAMPIMAGE input_buf
33 ; r12d = JDIMENSION in_row_group_ctr
34 ; r13 = JSAMPARRAY output_buf
36 %define wk(i) rbp - (WK_NUM - (i)) * SIZEOF_XMMWORD ; xmmword wk[WK_NUM]
40 GLOBAL_FUNCTION(jsimd_h2v1_merged_upsample_sse2)
42 EXTN(jsimd_h2v1_merged_upsample_sse2):
44 mov rax, rsp ; rax = original rbp
46 and rsp, byte (-SIZEOF_XMMWORD) ; align to 128 bits
48 mov rbp, rsp ; rbp = aligned rbp
61 mov rsip, JSAMPARRAY [rdi+0*SIZEOF_JSAMPARRAY]
62 mov rbxp, JSAMPARRAY [rdi+1*SIZEOF_JSAMPARRAY]
63 mov rdxp, JSAMPARRAY [rdi+2*SIZEOF_JSAMPARRAY]
65 mov rsip, JSAMPROW [rsi+rcx*SIZEOF_JSAMPROW] ; inptr0
66 mov rbxp, JSAMPROW [rbx+rcx*SIZEOF_JSAMPROW] ; inptr1
67 mov rdxp, JSAMPROW [rdx+rcx*SIZEOF_JSAMPROW] ; inptr2
68 mov rdip, JSAMPROW [rdi] ; outptr
74 movdqa xmm6, XMMWORD [rbx] ; xmm6=Cb(0123456789ABCDEF)
75 movdqa xmm7, XMMWORD [rdx] ; xmm7=Cr(0123456789ABCDEF)
77 pxor xmm1, xmm1 ; xmm1=(all 0's)
79 psllw xmm3, 7 ; xmm3={0xFF80 0xFF80 0xFF80 0xFF80 ..}
82 punpckhbw xmm6, xmm1 ; xmm6=Cb(89ABCDEF)=CbH
83 punpcklbw xmm4, xmm1 ; xmm4=Cb(01234567)=CbL
85 punpckhbw xmm7, xmm1 ; xmm7=Cr(89ABCDEF)=CrH
86 punpcklbw xmm0, xmm1 ; xmm0=Cr(01234567)=CrL
94 ; R = Y + 1.40200 * Cr
95 ; G = Y - 0.34414 * Cb - 0.71414 * Cr
96 ; B = Y + 1.77200 * Cb
98 ; (This implementation)
99 ; R = Y + 0.40200 * Cr + Cr
100 ; G = Y - 0.34414 * Cb + 0.28586 * Cr - Cr
101 ; B = Y - 0.22800 * Cb + Cb + Cb
103 movdqa xmm5, xmm6 ; xmm5=CbH
104 movdqa xmm2, xmm4 ; xmm2=CbL
105 paddw xmm6, xmm6 ; xmm6=2*CbH
106 paddw xmm4, xmm4 ; xmm4=2*CbL
107 movdqa xmm1, xmm7 ; xmm1=CrH
108 movdqa xmm3, xmm0 ; xmm3=CrL
109 paddw xmm7, xmm7 ; xmm7=2*CrH
110 paddw xmm0, xmm0 ; xmm0=2*CrL
112 pmulhw xmm6, [rel PW_MF0228] ; xmm6=(2*CbH * -FIX(0.22800))
113 pmulhw xmm4, [rel PW_MF0228] ; xmm4=(2*CbL * -FIX(0.22800))
114 pmulhw xmm7, [rel PW_F0402] ; xmm7=(2*CrH * FIX(0.40200))
115 pmulhw xmm0, [rel PW_F0402] ; xmm0=(2*CrL * FIX(0.40200))
117 paddw xmm6, [rel PW_ONE]
118 paddw xmm4, [rel PW_ONE]
119 psraw xmm6, 1 ; xmm6=(CbH * -FIX(0.22800))
120 psraw xmm4, 1 ; xmm4=(CbL * -FIX(0.22800))
121 paddw xmm7, [rel PW_ONE]
122 paddw xmm0, [rel PW_ONE]
123 psraw xmm7, 1 ; xmm7=(CrH * FIX(0.40200))
124 psraw xmm0, 1 ; xmm0=(CrL * FIX(0.40200))
128 paddw xmm6, xmm5 ; xmm6=(CbH * FIX(1.77200))=(B-Y)H
129 paddw xmm4, xmm2 ; xmm4=(CbL * FIX(1.77200))=(B-Y)L
130 paddw xmm7, xmm1 ; xmm7=(CrH * FIX(1.40200))=(R-Y)H
131 paddw xmm0, xmm3 ; xmm0=(CrL * FIX(1.40200))=(R-Y)L
133 movdqa XMMWORD [wk(0)], xmm6 ; wk(0)=(B-Y)H
134 movdqa XMMWORD [wk(1)], xmm7 ; wk(1)=(R-Y)H
140 pmaddwd xmm5, [rel PW_MF0344_F0285]
141 pmaddwd xmm6, [rel PW_MF0344_F0285]
144 pmaddwd xmm2, [rel PW_MF0344_F0285]
145 pmaddwd xmm7, [rel PW_MF0344_F0285]
147 paddd xmm5, [rel PD_ONEHALF]
148 paddd xmm6, [rel PD_ONEHALF]
149 psrad xmm5, SCALEBITS
150 psrad xmm6, SCALEBITS
151 paddd xmm2, [rel PD_ONEHALF]
152 paddd xmm7, [rel PD_ONEHALF]
153 psrad xmm2, SCALEBITS
154 psrad xmm7, SCALEBITS
156 packssdw xmm5, xmm6 ; xmm5=CbH*-FIX(0.344)+CrH*FIX(0.285)
157 packssdw xmm2, xmm7 ; xmm2=CbL*-FIX(0.344)+CrL*FIX(0.285)
158 psubw xmm5, xmm1 ; xmm5=CbH*-FIX(0.344)+CrH*-FIX(0.714)=(G-Y)H
159 psubw xmm2, xmm3 ; xmm2=CbL*-FIX(0.344)+CrL*-FIX(0.714)=(G-Y)L
161 movdqa XMMWORD [wk(2)], xmm5 ; wk(2)=(G-Y)H
167 movdqa xmm0, XMMWORD [wk(1)] ; xmm0=(R-Y)H
168 movdqa xmm2, XMMWORD [wk(2)] ; xmm2=(G-Y)H
169 movdqa xmm4, XMMWORD [wk(0)] ; xmm4=(B-Y)H
172 movdqa xmm7, XMMWORD [rsi] ; xmm7=Y(0123456789ABCDEF)
175 psrlw xmm6, BYTE_BIT ; xmm6={0xFF 0x00 0xFF 0x00 ..}
176 pand xmm6, xmm7 ; xmm6=Y(02468ACE)=YE
177 psrlw xmm7, BYTE_BIT ; xmm7=Y(13579BDF)=YO
179 movdqa xmm1, xmm0 ; xmm1=xmm0=(R-Y)(L/H)
180 movdqa xmm3, xmm2 ; xmm3=xmm2=(G-Y)(L/H)
181 movdqa xmm5, xmm4 ; xmm5=xmm4=(B-Y)(L/H)
183 paddw xmm0, xmm6 ; xmm0=((R-Y)+YE)=RE=R(02468ACE)
184 paddw xmm1, xmm7 ; xmm1=((R-Y)+YO)=RO=R(13579BDF)
185 packuswb xmm0, xmm0 ; xmm0=R(02468ACE********)
186 packuswb xmm1, xmm1 ; xmm1=R(13579BDF********)
188 paddw xmm2, xmm6 ; xmm2=((G-Y)+YE)=GE=G(02468ACE)
189 paddw xmm3, xmm7 ; xmm3=((G-Y)+YO)=GO=G(13579BDF)
190 packuswb xmm2, xmm2 ; xmm2=G(02468ACE********)
191 packuswb xmm3, xmm3 ; xmm3=G(13579BDF********)
193 paddw xmm4, xmm6 ; xmm4=((B-Y)+YE)=BE=B(02468ACE)
194 paddw xmm5, xmm7 ; xmm5=((B-Y)+YO)=BO=B(13579BDF)
195 packuswb xmm4, xmm4 ; xmm4=B(02468ACE********)
196 packuswb xmm5, xmm5 ; xmm5=B(13579BDF********)
198 %if RGB_PIXELSIZE == 3 ; ---------------
200 ; xmmA=(00 02 04 06 08 0A 0C 0E **), xmmB=(01 03 05 07 09 0B 0D 0F **)
201 ; xmmC=(10 12 14 16 18 1A 1C 1E **), xmmD=(11 13 15 17 19 1B 1D 1F **)
202 ; xmmE=(20 22 24 26 28 2A 2C 2E **), xmmF=(21 23 25 27 29 2B 2D 2F **)
203 ; xmmG=(** ** ** ** ** ** ** ** **), xmmH=(** ** ** ** ** ** ** ** **)
205 punpcklbw xmmA, xmmC ; xmmA=(00 10 02 12 04 14 06 16 08 18 0A 1A 0C 1C 0E 1E)
206 punpcklbw xmmE, xmmB ; xmmE=(20 01 22 03 24 05 26 07 28 09 2A 0B 2C 0D 2E 0F)
207 punpcklbw xmmD, xmmF ; xmmD=(11 21 13 23 15 25 17 27 19 29 1B 2B 1D 2D 1F 2F)
211 punpcklwd xmmA, xmmE ; xmmA=(00 10 20 01 02 12 22 03 04 14 24 05 06 16 26 07)
212 punpckhwd xmmG, xmmE ; xmmG=(08 18 28 09 0A 1A 2A 0B 0C 1C 2C 0D 0E 1E 2E 0F)
214 psrldq xmmH, 2 ; xmmH=(02 12 04 14 06 16 08 18 0A 1A 0C 1C 0E 1E -- --)
215 psrldq xmmE, 2 ; xmmE=(22 03 24 05 26 07 28 09 2A 0B 2C 0D 2E 0F -- --)
219 punpcklwd xmmD, xmmH ; xmmD=(11 21 02 12 13 23 04 14 15 25 06 16 17 27 08 18)
220 punpckhwd xmmC, xmmH ; xmmC=(19 29 0A 1A 1B 2B 0C 1C 1D 2D 0E 1E 1F 2F -- --)
222 psrldq xmmB, 2 ; xmmB=(13 23 15 25 17 27 19 29 1B 2B 1D 2D 1F 2F -- --)
225 punpcklwd xmmE, xmmB ; xmmE=(22 03 13 23 24 05 15 25 26 07 17 27 28 09 19 29)
226 punpckhwd xmmF, xmmB ; xmmF=(2A 0B 1B 2B 2C 0D 1D 2D 2E 0F 1F 2F -- -- -- --)
228 pshufd xmmH, xmmA, 0x4E ; xmmH=(04 14 24 05 06 16 26 07 00 10 20 01 02 12 22 03)
230 punpckldq xmmA, xmmD ; xmmA=(00 10 20 01 11 21 02 12 02 12 22 03 13 23 04 14)
231 punpckldq xmmE, xmmH ; xmmE=(22 03 13 23 04 14 24 05 24 05 15 25 06 16 26 07)
232 punpckhdq xmmD, xmmB ; xmmD=(15 25 06 16 26 07 17 27 17 27 08 18 28 09 19 29)
234 pshufd xmmH, xmmG, 0x4E ; xmmH=(0C 1C 2C 0D 0E 1E 2E 0F 08 18 28 09 0A 1A 2A 0B)
236 punpckldq xmmG, xmmC ; xmmG=(08 18 28 09 19 29 0A 1A 0A 1A 2A 0B 1B 2B 0C 1C)
237 punpckldq xmmF, xmmH ; xmmF=(2A 0B 1B 2B 0C 1C 2C 0D 2C 0D 1D 2D 0E 1E 2E 0F)
238 punpckhdq xmmC, xmmB ; xmmC=(1D 2D 0E 1E 2E 0F 1F 2F 1F 2F -- -- -- -- -- --)
240 punpcklqdq xmmA, xmmE ; xmmA=(00 10 20 01 11 21 02 12 22 03 13 23 04 14 24 05)
241 punpcklqdq xmmD, xmmG ; xmmD=(15 25 06 16 26 07 17 27 08 18 28 09 19 29 0A 1A)
242 punpcklqdq xmmF, xmmC ; xmmF=(2A 0B 1B 2B 0C 1C 2C 0D 1D 2D 0E 1E 2E 0F 1F 2F)
244 cmp rcx, byte SIZEOF_XMMWORD
245 jb short .column_st32
247 test rdi, SIZEOF_XMMWORD-1
249 ; --(aligned)-------------------
250 movntdq XMMWORD [rdi+0*SIZEOF_XMMWORD], xmmA
251 movntdq XMMWORD [rdi+1*SIZEOF_XMMWORD], xmmD
252 movntdq XMMWORD [rdi+2*SIZEOF_XMMWORD], xmmF
254 .out1: ; --(unaligned)-----------------
255 movdqu XMMWORD [rdi+0*SIZEOF_XMMWORD], xmmA
256 movdqu XMMWORD [rdi+1*SIZEOF_XMMWORD], xmmD
257 movdqu XMMWORD [rdi+2*SIZEOF_XMMWORD], xmmF
259 add rdi, byte RGB_PIXELSIZE*SIZEOF_XMMWORD ; outptr
260 sub rcx, byte SIZEOF_XMMWORD
263 add rsi, byte SIZEOF_XMMWORD ; inptr0
267 add rbx, byte SIZEOF_XMMWORD ; inptr1
268 add rdx, byte SIZEOF_XMMWORD ; inptr2
272 lea rcx, [rcx+rcx*2] ; imul ecx, RGB_PIXELSIZE
273 cmp rcx, byte 2*SIZEOF_XMMWORD
274 jb short .column_st16
275 movdqu XMMWORD [rdi+0*SIZEOF_XMMWORD], xmmA
276 movdqu XMMWORD [rdi+1*SIZEOF_XMMWORD], xmmD
277 add rdi, byte 2*SIZEOF_XMMWORD ; outptr
279 sub rcx, byte 2*SIZEOF_XMMWORD
280 jmp short .column_st15
282 cmp rcx, byte SIZEOF_XMMWORD
283 jb short .column_st15
284 movdqu XMMWORD [rdi+0*SIZEOF_XMMWORD], xmmA
285 add rdi, byte SIZEOF_XMMWORD ; outptr
287 sub rcx, byte SIZEOF_XMMWORD
289 ; Store the lower 8 bytes of xmmA to the output when it has enough
291 cmp rcx, byte SIZEOF_MMWORD
293 movq XMM_MMWORD [rdi], xmmA
294 add rdi, byte SIZEOF_MMWORD
295 sub rcx, byte SIZEOF_MMWORD
296 psrldq xmmA, SIZEOF_MMWORD
298 ; Store the lower 4 bytes of xmmA to the output when it has enough
300 cmp rcx, byte SIZEOF_DWORD
302 movd XMM_DWORD [rdi], xmmA
303 add rdi, byte SIZEOF_DWORD
304 sub rcx, byte SIZEOF_DWORD
305 psrldq xmmA, SIZEOF_DWORD
307 ; Store the lower 2 bytes of rax to the output when it has enough
310 cmp rcx, byte SIZEOF_WORD
313 add rdi, byte SIZEOF_WORD
314 sub rcx, byte SIZEOF_WORD
317 ; Store the lower 1 byte of rax to the output when it has enough
323 %else ; RGB_PIXELSIZE == 4 ; -----------
325 %ifdef RGBX_FILLER_0XFF
326 pcmpeqb xmm6, xmm6 ; xmm6=XE=X(02468ACE********)
327 pcmpeqb xmm7, xmm7 ; xmm7=XO=X(13579BDF********)
329 pxor xmm6, xmm6 ; xmm6=XE=X(02468ACE********)
330 pxor xmm7, xmm7 ; xmm7=XO=X(13579BDF********)
332 ; xmmA=(00 02 04 06 08 0A 0C 0E **), xmmB=(01 03 05 07 09 0B 0D 0F **)
333 ; xmmC=(10 12 14 16 18 1A 1C 1E **), xmmD=(11 13 15 17 19 1B 1D 1F **)
334 ; xmmE=(20 22 24 26 28 2A 2C 2E **), xmmF=(21 23 25 27 29 2B 2D 2F **)
335 ; xmmG=(30 32 34 36 38 3A 3C 3E **), xmmH=(31 33 35 37 39 3B 3D 3F **)
337 punpcklbw xmmA, xmmC ; xmmA=(00 10 02 12 04 14 06 16 08 18 0A 1A 0C 1C 0E 1E)
338 punpcklbw xmmE, xmmG ; xmmE=(20 30 22 32 24 34 26 36 28 38 2A 3A 2C 3C 2E 3E)
339 punpcklbw xmmB, xmmD ; xmmB=(01 11 03 13 05 15 07 17 09 19 0B 1B 0D 1D 0F 1F)
340 punpcklbw xmmF, xmmH ; xmmF=(21 31 23 33 25 35 27 37 29 39 2B 3B 2D 3D 2F 3F)
343 punpcklwd xmmA, xmmE ; xmmA=(00 10 20 30 02 12 22 32 04 14 24 34 06 16 26 36)
344 punpckhwd xmmC, xmmE ; xmmC=(08 18 28 38 0A 1A 2A 3A 0C 1C 2C 3C 0E 1E 2E 3E)
346 punpcklwd xmmB, xmmF ; xmmB=(01 11 21 31 03 13 23 33 05 15 25 35 07 17 27 37)
347 punpckhwd xmmG, xmmF ; xmmG=(09 19 29 39 0B 1B 2B 3B 0D 1D 2D 3D 0F 1F 2F 3F)
350 punpckldq xmmA, xmmB ; xmmA=(00 10 20 30 01 11 21 31 02 12 22 32 03 13 23 33)
351 punpckhdq xmmD, xmmB ; xmmD=(04 14 24 34 05 15 25 35 06 16 26 36 07 17 27 37)
353 punpckldq xmmC, xmmG ; xmmC=(08 18 28 38 09 19 29 39 0A 1A 2A 3A 0B 1B 2B 3B)
354 punpckhdq xmmH, xmmG ; xmmH=(0C 1C 2C 3C 0D 1D 2D 3D 0E 1E 2E 3E 0F 1F 2F 3F)
356 cmp rcx, byte SIZEOF_XMMWORD
357 jb short .column_st32
359 test rdi, SIZEOF_XMMWORD-1
361 ; --(aligned)-------------------
362 movntdq XMMWORD [rdi+0*SIZEOF_XMMWORD], xmmA
363 movntdq XMMWORD [rdi+1*SIZEOF_XMMWORD], xmmD
364 movntdq XMMWORD [rdi+2*SIZEOF_XMMWORD], xmmC
365 movntdq XMMWORD [rdi+3*SIZEOF_XMMWORD], xmmH
367 .out1: ; --(unaligned)-----------------
368 movdqu XMMWORD [rdi+0*SIZEOF_XMMWORD], xmmA
369 movdqu XMMWORD [rdi+1*SIZEOF_XMMWORD], xmmD
370 movdqu XMMWORD [rdi+2*SIZEOF_XMMWORD], xmmC
371 movdqu XMMWORD [rdi+3*SIZEOF_XMMWORD], xmmH
373 add rdi, byte RGB_PIXELSIZE*SIZEOF_XMMWORD ; outptr
374 sub rcx, byte SIZEOF_XMMWORD
377 add rsi, byte SIZEOF_XMMWORD ; inptr0
381 add rbx, byte SIZEOF_XMMWORD ; inptr1
382 add rdx, byte SIZEOF_XMMWORD ; inptr2
386 cmp rcx, byte SIZEOF_XMMWORD/2
387 jb short .column_st16
388 movdqu XMMWORD [rdi+0*SIZEOF_XMMWORD], xmmA
389 movdqu XMMWORD [rdi+1*SIZEOF_XMMWORD], xmmD
390 add rdi, byte 2*SIZEOF_XMMWORD ; outptr
393 sub rcx, byte SIZEOF_XMMWORD/2
395 cmp rcx, byte SIZEOF_XMMWORD/4
396 jb short .column_st15
397 movdqu XMMWORD [rdi+0*SIZEOF_XMMWORD], xmmA
398 add rdi, byte SIZEOF_XMMWORD ; outptr
400 sub rcx, byte SIZEOF_XMMWORD/4
402 ; Store two pixels (8 bytes) of xmmA to the output when it has enough
404 cmp rcx, byte SIZEOF_XMMWORD/8
406 movq XMM_MMWORD [rdi], xmmA
407 add rdi, byte SIZEOF_XMMWORD/8*4
408 sub rcx, byte SIZEOF_XMMWORD/8
409 psrldq xmmA, SIZEOF_XMMWORD/8*4
411 ; Store one pixel (4 bytes) of xmmA to the output when it has enough
415 movd XMM_DWORD [rdi], xmmA
417 %endif ; RGB_PIXELSIZE ; ---------------
420 sfence ; flush the write buffer
425 mov rsp, rbp ; rsp <- aligned rbp
426 pop rsp ; rsp <- original rbp
430 ; --------------------------------------------------------------------------
432 ; Upsample and color convert for the case of 2:1 horizontal and 2:1 vertical.
435 ; jsimd_h2v2_merged_upsample_sse2(JDIMENSION output_width,
436 ; JSAMPIMAGE input_buf,
437 ; JDIMENSION in_row_group_ctr,
438 ; JSAMPARRAY output_buf);
441 ; r10d = JDIMENSION output_width
442 ; r11 = JSAMPIMAGE input_buf
443 ; r12d = JDIMENSION in_row_group_ctr
444 ; r13 = JSAMPARRAY output_buf
447 GLOBAL_FUNCTION(jsimd_h2v2_merged_upsample_sse2)
449 EXTN(jsimd_h2v2_merged_upsample_sse2):
460 mov rsip, JSAMPARRAY [rdi+0*SIZEOF_JSAMPARRAY]
461 mov rbxp, JSAMPARRAY [rdi+1*SIZEOF_JSAMPARRAY]
462 mov rdxp, JSAMPARRAY [rdi+2*SIZEOF_JSAMPARRAY]
464 lea rsi, [rsi+rcx*SIZEOF_JSAMPROW]
466 sub rsp, SIZEOF_JSAMPARRAY*4
467 mov JSAMPARRAY [rsp+0*SIZEOF_JSAMPARRAY], rsip ; intpr00
468 mov JSAMPARRAY [rsp+1*SIZEOF_JSAMPARRAY], rbxp ; intpr1
469 mov JSAMPARRAY [rsp+2*SIZEOF_JSAMPARRAY], rdxp ; intpr2
488 call EXTN(jsimd_h2v1_merged_upsample_sse2)
493 mov rsip, JSAMPARRAY [rsp+0*SIZEOF_JSAMPARRAY]
494 mov rbxp, JSAMPARRAY [rsp+1*SIZEOF_JSAMPARRAY]
495 mov rdxp, JSAMPARRAY [rsp+2*SIZEOF_JSAMPARRAY]
497 add rdi, byte SIZEOF_JSAMPROW ; outptr1
498 add rsi, byte SIZEOF_JSAMPROW ; inptr01
500 mov JSAMPARRAY [rsp+0*SIZEOF_JSAMPARRAY], rsip ; intpr00
501 mov JSAMPARRAY [rsp+1*SIZEOF_JSAMPARRAY], rbxp ; intpr1
502 mov JSAMPARRAY [rsp+2*SIZEOF_JSAMPARRAY], rdxp ; intpr2
521 call EXTN(jsimd_h2v1_merged_upsample_sse2)
526 mov rsip, JSAMPARRAY [rsp+0*SIZEOF_JSAMPARRAY]
527 mov rbxp, JSAMPARRAY [rsp+1*SIZEOF_JSAMPARRAY]
528 mov rdxp, JSAMPARRAY [rsp+2*SIZEOF_JSAMPARRAY]
529 add rsp, SIZEOF_JSAMPARRAY*4
536 ; For some reason, the OS X linker does not honor the request to align the
537 ; segment unless we do this.