/media/libjpeg/simd/jimmxred.asm

http://github.com/zpao/v8monkey · Assembly · 706 lines · 482 code · 132 blank · 92 comment · 1 complexity · 68891dfcfa1d936e39e0b047945dd602 MD5 · raw file 

    

  1. ;
    2. 

  2. ; jimmxred.asm - reduced-size IDCT (MMX)
    3. 

  3. ;
    4. 

  4. ; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
    5. 

  5. ;
    6. 

  6. ; Based on
    7. 

  7. ; x86 SIMD extension for IJG JPEG library
    8. 

  8. ; Copyright (C) 1999-2006, MIYASAKA Masaru.
    9. 

  9. ; For conditions of distribution and use, see copyright notice in jsimdext.inc
    10. 

  10. ;
    11. 

  11. ; This file should be assembled with NASM (Netwide Assembler),
    12. 

  12. ; can *not* be assembled with Microsoft's MASM or any compatible
    13. 

  13. ; assembler (including Borland's Turbo Assembler).
    14. 

  14. ; NASM is available from http://nasm.sourceforge.net/ or
    15. 

  15. ; http://sourceforge.net/project/showfiles.php?group_id=6208
    16. 

  16. ;
    17. 

  17. ; This file contains inverse-DCT routines that produce reduced-size
    18. 

  18. ; output: either 4x4 or 2x2 pixels from an 8x8 DCT block.
    19. 

  19. ; The following code is based directly on the IJG's original jidctred.c;
    20. 

  20. ; see the jidctred.c for more details.
    21. 

  21. ;
    22. 

  22. ; [TAB8]
    23. 

  23. 

  24. %include "jsimdext.inc"
    25. 

  25. %include "jdct.inc"
    26. 

  26. 

  27. ; --------------------------------------------------------------------------
    28. 

  28. 

  29. %define CONST_BITS	13
    30. 

  30. %define PASS1_BITS	2
    31. 

  31. 

  32. %define DESCALE_P1_4	(CONST_BITS-PASS1_BITS+1)
    33. 

  33. %define DESCALE_P2_4	(CONST_BITS+PASS1_BITS+3+1)
    34. 

  34. %define DESCALE_P1_2	(CONST_BITS-PASS1_BITS+2)
    35. 

  35. %define DESCALE_P2_2	(CONST_BITS+PASS1_BITS+3+2)
    36. 

  36. 

  37. %if CONST_BITS == 13
    38. 

  38. F_0_211	equ	 1730		; FIX(0.211164243)
    39. 

  39. F_0_509	equ	 4176		; FIX(0.509795579)
    40. 

  40. F_0_601	equ	 4926		; FIX(0.601344887)
    41. 

  41. F_0_720	equ	 5906		; FIX(0.720959822)
    42. 

  42. F_0_765	equ	 6270		; FIX(0.765366865)
    43. 

  43. F_0_850	equ	 6967		; FIX(0.850430095)
    44. 

  44. F_0_899	equ	 7373		; FIX(0.899976223)
    45. 

  45. F_1_061	equ	 8697		; FIX(1.061594337)
    46. 

  46. F_1_272	equ	10426		; FIX(1.272758580)
    47. 

  47. F_1_451	equ	11893		; FIX(1.451774981)
    48. 

  48. F_1_847	equ	15137		; FIX(1.847759065)
    49. 

  49. F_2_172	equ	17799		; FIX(2.172734803)
    50. 

  50. F_2_562	equ	20995		; FIX(2.562915447)
    51. 

  51. F_3_624	equ	29692		; FIX(3.624509785)
    52. 

  52. %else
    53. 

  53. ; NASM cannot do compile-time arithmetic on floating-point constants.
    54. 

  54. %define DESCALE(x,n)  (((x)+(1<<((n)-1)))>>(n))
    55. 

  55. F_0_211	equ	DESCALE( 226735879,30-CONST_BITS)	; FIX(0.211164243)
    56. 

  56. F_0_509	equ	DESCALE( 547388834,30-CONST_BITS)	; FIX(0.509795579)
    57. 

  57. F_0_601	equ	DESCALE( 645689155,30-CONST_BITS)	; FIX(0.601344887)
    58. 

  58. F_0_720	equ	DESCALE( 774124714,30-CONST_BITS)	; FIX(0.720959822)
    59. 

  59. F_0_765	equ	DESCALE( 821806413,30-CONST_BITS)	; FIX(0.765366865)
    60. 

  60. F_0_850	equ	DESCALE( 913142361,30-CONST_BITS)	; FIX(0.850430095)
    61. 

  61. F_0_899	equ	DESCALE( 966342111,30-CONST_BITS)	; FIX(0.899976223)
    62. 

  62. F_1_061	equ	DESCALE(1139878239,30-CONST_BITS)	; FIX(1.061594337)
    63. 

  63. F_1_272	equ	DESCALE(1366614119,30-CONST_BITS)	; FIX(1.272758580)
    64. 

  64. F_1_451	equ	DESCALE(1558831516,30-CONST_BITS)	; FIX(1.451774981)
    65. 

  65. F_1_847	equ	DESCALE(1984016188,30-CONST_BITS)	; FIX(1.847759065)
    66. 

  66. F_2_172	equ	DESCALE(2332956230,30-CONST_BITS)	; FIX(2.172734803)
    67. 

  67. F_2_562	equ	DESCALE(2751909506,30-CONST_BITS)	; FIX(2.562915447)
    68. 

  68. F_3_624	equ	DESCALE(3891787747,30-CONST_BITS)	; FIX(3.624509785)
    69. 

  69. %endif
    70. 

  70. 

  71. ; --------------------------------------------------------------------------
    72. 

  72. 	SECTION	SEG_CONST
    73. 

  73. 

  74. 	alignz	16
    75. 

  75. 	global	EXTN(jconst_idct_red_mmx)
    76. 

  76. 

  77. EXTN(jconst_idct_red_mmx):
    78. 

  78. 

  79. PW_F184_MF076	times 2 dw  F_1_847,-F_0_765
    80. 

  80. PW_F256_F089	times 2 dw  F_2_562, F_0_899
    81. 

  81. PW_F106_MF217	times 2 dw  F_1_061,-F_2_172
    82. 

  82. PW_MF060_MF050	times 2 dw -F_0_601,-F_0_509
    83. 

  83. PW_F145_MF021	times 2 dw  F_1_451,-F_0_211
    84. 

  84. PW_F362_MF127	times 2 dw  F_3_624,-F_1_272
    85. 

  85. PW_F085_MF072	times 2 dw  F_0_850,-F_0_720
    86. 

  86. PD_DESCALE_P1_4	times 2 dd  1 << (DESCALE_P1_4-1)
    87. 

  87. PD_DESCALE_P2_4	times 2 dd  1 << (DESCALE_P2_4-1)
    88. 

  88. PD_DESCALE_P1_2	times 2 dd  1 << (DESCALE_P1_2-1)
    89. 

  89. PD_DESCALE_P2_2	times 2 dd  1 << (DESCALE_P2_2-1)
    90. 

  90. PB_CENTERJSAMP	times 8 db  CENTERJSAMPLE
    91. 

  91. 

  92. 	alignz	16
    93. 

  93. 

  94. ; --------------------------------------------------------------------------
    95. 

  95. 	SECTION	SEG_TEXT
    96. 

  96. 	BITS	32
    97. 

  97. ;
    98. 

  98. ; Perform dequantization and inverse DCT on one block of coefficients,
    99. 

  99. ; producing a reduced-size 4x4 output block.
    100. 

  100. ;
    101. 

  101. ; GLOBAL(void)
    102. 

  102. ; jsimd_idct_4x4_mmx (void * dct_table, JCOEFPTR coef_block,
    103. 

  103. ;                     JSAMPARRAY output_buf, JDIMENSION output_col)
    104. 

  104. ;
    105. 

  105. 

  106. %define dct_table(b)	(b)+8			; void * dct_table
    107. 

  107. %define coef_block(b)	(b)+12		; JCOEFPTR coef_block
    108. 

  108. %define output_buf(b)	(b)+16		; JSAMPARRAY output_buf
    109. 

  109. %define output_col(b)	(b)+20		; JDIMENSION output_col
    110. 

  110. 

  111. %define original_ebp	ebp+0
    112. 

  112. %define wk(i)		ebp-(WK_NUM-(i))*SIZEOF_MMWORD	; mmword wk[WK_NUM]
    113. 

  113. %define WK_NUM		2
    114. 

  114. %define workspace	wk(0)-DCTSIZE2*SIZEOF_JCOEF
    115. 

  115. 					; JCOEF workspace[DCTSIZE2]
    116. 

  116. 

  117. 	align	16
    118. 

  118. 	global	EXTN(jsimd_idct_4x4_mmx)
    119. 

  119. 

  120. EXTN(jsimd_idct_4x4_mmx):
    121. 

  121. 	push	ebp
    122. 

  122. 	mov	eax,esp				; eax = original ebp
    123. 

  123. 	sub	esp, byte 4
    124. 

  124. 	and	esp, byte (-SIZEOF_MMWORD)	; align to 64 bits
    125. 

  125. 	mov	[esp],eax
    126. 

  126. 	mov	ebp,esp				; ebp = aligned ebp
    127. 

  127. 	lea	esp, [workspace]
    128. 

  128. 	pushpic	ebx
    129. 

  129. ;	push	ecx		; need not be preserved
    130. 

  130. ;	push	edx		; need not be preserved
    131. 

  131. 	push	esi
    132. 

  132. 	push	edi
    133. 

  133. 

  134. 	get_GOT	ebx		; get GOT address
    135. 

  135. 

  136. 	; ---- Pass 1: process columns from input, store into work array.
    137. 

  137. 

  138. ;	mov	eax, [original_ebp]
    139. 

  139. 	mov	edx, POINTER [dct_table(eax)]	; quantptr
    140. 

  140. 	mov	esi, JCOEFPTR [coef_block(eax)]		; inptr
    141. 

  141. 	lea	edi, [workspace]			; JCOEF * wsptr
    142. 

  142. 	mov	ecx, DCTSIZE/4				; ctr
    143. 

  143. 	alignx	16,7
    144. 

  144. .columnloop:
    145. 

  145. %ifndef NO_ZERO_COLUMN_TEST_4X4_MMX
    146. 

  146. 	mov	eax, DWORD [DWBLOCK(1,0,esi,SIZEOF_JCOEF)]
    147. 

  147. 	or	eax, DWORD [DWBLOCK(2,0,esi,SIZEOF_JCOEF)]
    148. 

  148. 	jnz	short .columnDCT
    149. 

  149. 

  150. 	movq	mm0, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)]
    151. 

  151. 	movq	mm1, MMWORD [MMBLOCK(2,0,esi,SIZEOF_JCOEF)]
    152. 

  152. 	por	mm0, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)]
    153. 

  153. 	por	mm1, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)]
    154. 

  154. 	por	mm0, MMWORD [MMBLOCK(6,0,esi,SIZEOF_JCOEF)]
    155. 

  155. 	por	mm1, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)]
    156. 

  156. 	por	mm0,mm1
    157. 

  157. 	packsswb mm0,mm0
    158. 

  158. 	movd	eax,mm0
    159. 

  159. 	test	eax,eax
    160. 

  160. 	jnz	short .columnDCT
    161. 

  161. 

  162. 	; -- AC terms all zero
    163. 

  163. 

  164. 	movq	mm0, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)]
    165. 

  165. 	pmullw	mm0, MMWORD [MMBLOCK(0,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
    166. 

  166. 

  167. 	psllw	mm0,PASS1_BITS
    168. 

  168. 

  169. 	movq      mm2,mm0		; mm0=in0=(00 01 02 03)
    170. 

  170. 	punpcklwd mm0,mm0		; mm0=(00 00 01 01)
    171. 

  171. 	punpckhwd mm2,mm2		; mm2=(02 02 03 03)
    172. 

  172. 

  173. 	movq      mm1,mm0
    174. 

  174. 	punpckldq mm0,mm0		; mm0=(00 00 00 00)
    175. 

  175. 	punpckhdq mm1,mm1		; mm1=(01 01 01 01)
    176. 

  176. 	movq      mm3,mm2
    177. 

  177. 	punpckldq mm2,mm2		; mm2=(02 02 02 02)
    178. 

  178. 	punpckhdq mm3,mm3		; mm3=(03 03 03 03)
    179. 

  179. 

  180. 	movq	MMWORD [MMBLOCK(0,0,edi,SIZEOF_JCOEF)], mm0
    181. 

  181. 	movq	MMWORD [MMBLOCK(1,0,edi,SIZEOF_JCOEF)], mm1
    182. 

  182. 	movq	MMWORD [MMBLOCK(2,0,edi,SIZEOF_JCOEF)], mm2
    183. 

  183. 	movq	MMWORD [MMBLOCK(3,0,edi,SIZEOF_JCOEF)], mm3
    184. 

  184. 	jmp	near .nextcolumn
    185. 

  185. 	alignx	16,7
    186. 

  186. %endif
    187. 

  187. .columnDCT:
    188. 

  188. 

  189. 	; -- Odd part
    190. 

  190. 

  191. 	movq	mm0, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)]
    192. 

  192. 	movq	mm1, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)]
    193. 

  193. 	pmullw	mm0, MMWORD [MMBLOCK(1,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
    194. 

  194. 	pmullw	mm1, MMWORD [MMBLOCK(3,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
    195. 

  195. 	movq	mm2, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)]
    196. 

  196. 	movq	mm3, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)]
    197. 

  197. 	pmullw	mm2, MMWORD [MMBLOCK(5,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
    198. 

  198. 	pmullw	mm3, MMWORD [MMBLOCK(7,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
    199. 

  199. 

  200. 	movq      mm4,mm0
    201. 

  201. 	movq      mm5,mm0
    202. 

  202. 	punpcklwd mm4,mm1
    203. 

  203. 	punpckhwd mm5,mm1
    204. 

  204. 	movq      mm0,mm4
    205. 

  205. 	movq      mm1,mm5
    206. 

  206. 	pmaddwd   mm4,[GOTOFF(ebx,PW_F256_F089)]	; mm4=(tmp2L)
    207. 

  207. 	pmaddwd   mm5,[GOTOFF(ebx,PW_F256_F089)]	; mm5=(tmp2H)
    208. 

  208. 	pmaddwd   mm0,[GOTOFF(ebx,PW_F106_MF217)]	; mm0=(tmp0L)
    209. 

  209. 	pmaddwd   mm1,[GOTOFF(ebx,PW_F106_MF217)]	; mm1=(tmp0H)
    210. 

  210. 

  211. 	movq      mm6,mm2
    212. 

  212. 	movq      mm7,mm2
    213. 

  213. 	punpcklwd mm6,mm3
    214. 

  214. 	punpckhwd mm7,mm3
    215. 

  215. 	movq      mm2,mm6
    216. 

  216. 	movq      mm3,mm7
    217. 

  217. 	pmaddwd   mm6,[GOTOFF(ebx,PW_MF060_MF050)]	; mm6=(tmp2L)
    218. 

  218. 	pmaddwd   mm7,[GOTOFF(ebx,PW_MF060_MF050)]	; mm7=(tmp2H)
    219. 

  219. 	pmaddwd   mm2,[GOTOFF(ebx,PW_F145_MF021)]	; mm2=(tmp0L)
    220. 

  220. 	pmaddwd   mm3,[GOTOFF(ebx,PW_F145_MF021)]	; mm3=(tmp0H)
    221. 

  221. 

  222. 	paddd	mm6,mm4			; mm6=tmp2L
    223. 

  223. 	paddd	mm7,mm5			; mm7=tmp2H
    224. 

  224. 	paddd	mm2,mm0			; mm2=tmp0L
    225. 

  225. 	paddd	mm3,mm1			; mm3=tmp0H
    226. 

  226. 

  227. 	movq	MMWORD [wk(0)], mm2	; wk(0)=tmp0L
    228. 

  228. 	movq	MMWORD [wk(1)], mm3	; wk(1)=tmp0H
    229. 

  229. 

  230. 	; -- Even part
    231. 

  231. 

  232. 	movq	mm4, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)]
    233. 

  233. 	movq	mm5, MMWORD [MMBLOCK(2,0,esi,SIZEOF_JCOEF)]
    234. 

  234. 	movq	mm0, MMWORD [MMBLOCK(6,0,esi,SIZEOF_JCOEF)]
    235. 

  235. 	pmullw	mm4, MMWORD [MMBLOCK(0,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
    236. 

  236. 	pmullw	mm5, MMWORD [MMBLOCK(2,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
    237. 

  237. 	pmullw	mm0, MMWORD [MMBLOCK(6,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
    238. 

  238. 

  239. 	pxor      mm1,mm1
    240. 

  240. 	pxor      mm2,mm2
    241. 

  241. 	punpcklwd mm1,mm4		; mm1=tmp0L
    242. 

  242. 	punpckhwd mm2,mm4		; mm2=tmp0H
    243. 

  243. 	psrad     mm1,(16-CONST_BITS-1)	; psrad mm1,16 & pslld mm1,CONST_BITS+1
    244. 

  244. 	psrad     mm2,(16-CONST_BITS-1)	; psrad mm2,16 & pslld mm2,CONST_BITS+1
    245. 

  245. 

  246. 	movq      mm3,mm5		; mm5=in2=z2
    247. 

  247. 	punpcklwd mm5,mm0		; mm0=in6=z3
    248. 

  248. 	punpckhwd mm3,mm0
    249. 

  249. 	pmaddwd   mm5,[GOTOFF(ebx,PW_F184_MF076)]	; mm5=tmp2L
    250. 

  250. 	pmaddwd   mm3,[GOTOFF(ebx,PW_F184_MF076)]	; mm3=tmp2H
    251. 

  251. 

  252. 	movq	mm4,mm1
    253. 

  253. 	movq	mm0,mm2
    254. 

  254. 	paddd	mm1,mm5			; mm1=tmp10L
    255. 

  255. 	paddd	mm2,mm3			; mm2=tmp10H
    256. 

  256. 	psubd	mm4,mm5			; mm4=tmp12L
    257. 

  257. 	psubd	mm0,mm3			; mm0=tmp12H
    258. 

  258. 

  259. 	; -- Final output stage
    260. 

  260. 

  261. 	movq	mm5,mm1
    262. 

  262. 	movq	mm3,mm2
    263. 

  263. 	paddd	mm1,mm6			; mm1=data0L
    264. 

  264. 	paddd	mm2,mm7			; mm2=data0H
    265. 

  265. 	psubd	mm5,mm6			; mm5=data3L
    266. 

  266. 	psubd	mm3,mm7			; mm3=data3H
    267. 

  267. 

  268. 	movq	mm6,[GOTOFF(ebx,PD_DESCALE_P1_4)]	; mm6=[PD_DESCALE_P1_4]
    269. 

  269. 

  270. 	paddd	mm1,mm6
    271. 

  271. 	paddd	mm2,mm6
    272. 

  272. 	psrad	mm1,DESCALE_P1_4
    273. 

  273. 	psrad	mm2,DESCALE_P1_4
    274. 

  274. 	paddd	mm5,mm6
    275. 

  275. 	paddd	mm3,mm6
    276. 

  276. 	psrad	mm5,DESCALE_P1_4
    277. 

  277. 	psrad	mm3,DESCALE_P1_4
    278. 

  278. 

  279. 	packssdw  mm1,mm2		; mm1=data0=(00 01 02 03)
    280. 

  280. 	packssdw  mm5,mm3		; mm5=data3=(30 31 32 33)
    281. 

  281. 

  282. 	movq	mm7, MMWORD [wk(0)]	; mm7=tmp0L
    283. 

  283. 	movq	mm6, MMWORD [wk(1)]	; mm6=tmp0H
    284. 

  284. 

  285. 	movq	mm2,mm4
    286. 

  286. 	movq	mm3,mm0
    287. 

  287. 	paddd	mm4,mm7			; mm4=data1L
    288. 

  288. 	paddd	mm0,mm6			; mm0=data1H
    289. 

  289. 	psubd	mm2,mm7			; mm2=data2L
    290. 

  290. 	psubd	mm3,mm6			; mm3=data2H
    291. 

  291. 

  292. 	movq	mm7,[GOTOFF(ebx,PD_DESCALE_P1_4)]	; mm7=[PD_DESCALE_P1_4]
    293. 

  293. 

  294. 	paddd	mm4,mm7
    295. 

  295. 	paddd	mm0,mm7
    296. 

  296. 	psrad	mm4,DESCALE_P1_4
    297. 

  297. 	psrad	mm0,DESCALE_P1_4
    298. 

  298. 	paddd	mm2,mm7
    299. 

  299. 	paddd	mm3,mm7
    300. 

  300. 	psrad	mm2,DESCALE_P1_4
    301. 

  301. 	psrad	mm3,DESCALE_P1_4
    302. 

  302. 

  303. 	packssdw  mm4,mm0		; mm4=data1=(10 11 12 13)
    304. 

  304. 	packssdw  mm2,mm3		; mm2=data2=(20 21 22 23)
    305. 

  305. 

  306. 	movq      mm6,mm1		; transpose coefficients(phase 1)
    307. 

  307. 	punpcklwd mm1,mm4		; mm1=(00 10 01 11)
    308. 

  308. 	punpckhwd mm6,mm4		; mm6=(02 12 03 13)
    309. 

  309. 	movq      mm7,mm2		; transpose coefficients(phase 1)
    310. 

  310. 	punpcklwd mm2,mm5		; mm2=(20 30 21 31)
    311. 

  311. 	punpckhwd mm7,mm5		; mm7=(22 32 23 33)
    312. 

  312. 

  313. 	movq      mm0,mm1		; transpose coefficients(phase 2)
    314. 

  314. 	punpckldq mm1,mm2		; mm1=(00 10 20 30)
    315. 

  315. 	punpckhdq mm0,mm2		; mm0=(01 11 21 31)
    316. 

  316. 	movq      mm3,mm6		; transpose coefficients(phase 2)
    317. 

  317. 	punpckldq mm6,mm7		; mm6=(02 12 22 32)
    318. 

  318. 	punpckhdq mm3,mm7		; mm3=(03 13 23 33)
    319. 

  319. 

  320. 	movq	MMWORD [MMBLOCK(0,0,edi,SIZEOF_JCOEF)], mm1
    321. 

  321. 	movq	MMWORD [MMBLOCK(1,0,edi,SIZEOF_JCOEF)], mm0
    322. 

  322. 	movq	MMWORD [MMBLOCK(2,0,edi,SIZEOF_JCOEF)], mm6
    323. 

  323. 	movq	MMWORD [MMBLOCK(3,0,edi,SIZEOF_JCOEF)], mm3
    324. 

  324. 

  325. .nextcolumn:
    326. 

  326. 	add	esi, byte 4*SIZEOF_JCOEF		; coef_block
    327. 

  327. 	add	edx, byte 4*SIZEOF_ISLOW_MULT_TYPE	; quantptr
    328. 

  328. 	add	edi, byte 4*DCTSIZE*SIZEOF_JCOEF	; wsptr
    329. 

  329. 	dec	ecx					; ctr
    330. 

  330. 	jnz	near .columnloop
    331. 

  331. 

  332. 	; ---- Pass 2: process rows from work array, store into output array.
    333. 

  333. 

  334. 	mov	eax, [original_ebp]
    335. 

  335. 	lea	esi, [workspace]			; JCOEF * wsptr
    336. 

  336. 	mov	edi, JSAMPARRAY [output_buf(eax)]	; (JSAMPROW *)
    337. 

  337. 	mov	eax, JDIMENSION [output_col(eax)]
    338. 

  338. 

  339. 	; -- Odd part
    340. 

  340. 

  341. 	movq	mm0, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)]
    342. 

  342. 	movq	mm1, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)]
    343. 

  343. 	movq	mm2, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)]
    344. 

  344. 	movq	mm3, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)]
    345. 

  345. 

  346. 	movq      mm4,mm0
    347. 

  347. 	movq      mm5,mm0
    348. 

  348. 	punpcklwd mm4,mm1
    349. 

  349. 	punpckhwd mm5,mm1
    350. 

  350. 	movq      mm0,mm4
    351. 

  351. 	movq      mm1,mm5
    352. 

  352. 	pmaddwd   mm4,[GOTOFF(ebx,PW_F256_F089)]	; mm4=(tmp2L)
    353. 

  353. 	pmaddwd   mm5,[GOTOFF(ebx,PW_F256_F089)]	; mm5=(tmp2H)
    354. 

  354. 	pmaddwd   mm0,[GOTOFF(ebx,PW_F106_MF217)]	; mm0=(tmp0L)
    355. 

  355. 	pmaddwd   mm1,[GOTOFF(ebx,PW_F106_MF217)]	; mm1=(tmp0H)
    356. 

  356. 

  357. 	movq      mm6,mm2
    358. 

  358. 	movq      mm7,mm2
    359. 

  359. 	punpcklwd mm6,mm3
    360. 

  360. 	punpckhwd mm7,mm3
    361. 

  361. 	movq      mm2,mm6
    362. 

  362. 	movq      mm3,mm7
    363. 

  363. 	pmaddwd   mm6,[GOTOFF(ebx,PW_MF060_MF050)]	; mm6=(tmp2L)
    364. 

  364. 	pmaddwd   mm7,[GOTOFF(ebx,PW_MF060_MF050)]	; mm7=(tmp2H)
    365. 

  365. 	pmaddwd   mm2,[GOTOFF(ebx,PW_F145_MF021)]	; mm2=(tmp0L)
    366. 

  366. 	pmaddwd   mm3,[GOTOFF(ebx,PW_F145_MF021)]	; mm3=(tmp0H)
    367. 

  367. 

  368. 	paddd	mm6,mm4			; mm6=tmp2L
    369. 

  369. 	paddd	mm7,mm5			; mm7=tmp2H
    370. 

  370. 	paddd	mm2,mm0			; mm2=tmp0L
    371. 

  371. 	paddd	mm3,mm1			; mm3=tmp0H
    372. 

  372. 

  373. 	movq	MMWORD [wk(0)], mm2	; wk(0)=tmp0L
    374. 

  374. 	movq	MMWORD [wk(1)], mm3	; wk(1)=tmp0H
    375. 

  375. 

  376. 	; -- Even part
    377. 

  377. 

  378. 	movq	mm4, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)]
    379. 

  379. 	movq	mm5, MMWORD [MMBLOCK(2,0,esi,SIZEOF_JCOEF)]
    380. 

  380. 	movq	mm0, MMWORD [MMBLOCK(6,0,esi,SIZEOF_JCOEF)]
    381. 

  381. 

  382. 	pxor      mm1,mm1
    383. 

  383. 	pxor      mm2,mm2
    384. 

  384. 	punpcklwd mm1,mm4		; mm1=tmp0L
    385. 

  385. 	punpckhwd mm2,mm4		; mm2=tmp0H
    386. 

  386. 	psrad     mm1,(16-CONST_BITS-1)	; psrad mm1,16 & pslld mm1,CONST_BITS+1
    387. 

  387. 	psrad     mm2,(16-CONST_BITS-1)	; psrad mm2,16 & pslld mm2,CONST_BITS+1
    388. 

  388. 

  389. 	movq      mm3,mm5		; mm5=in2=z2
    390. 

  390. 	punpcklwd mm5,mm0		; mm0=in6=z3
    391. 

  391. 	punpckhwd mm3,mm0
    392. 

  392. 	pmaddwd   mm5,[GOTOFF(ebx,PW_F184_MF076)]	; mm5=tmp2L
    393. 

  393. 	pmaddwd   mm3,[GOTOFF(ebx,PW_F184_MF076)]	; mm3=tmp2H
    394. 

  394. 

  395. 	movq	mm4,mm1
    396. 

  396. 	movq	mm0,mm2
    397. 

  397. 	paddd	mm1,mm5			; mm1=tmp10L
    398. 

  398. 	paddd	mm2,mm3			; mm2=tmp10H
    399. 

  399. 	psubd	mm4,mm5			; mm4=tmp12L
    400. 

  400. 	psubd	mm0,mm3			; mm0=tmp12H
    401. 

  401. 

  402. 	; -- Final output stage
    403. 

  403. 

  404. 	movq	mm5,mm1
    405. 

  405. 	movq	mm3,mm2
    406. 

  406. 	paddd	mm1,mm6			; mm1=data0L
    407. 

  407. 	paddd	mm2,mm7			; mm2=data0H
    408. 

  408. 	psubd	mm5,mm6			; mm5=data3L
    409. 

  409. 	psubd	mm3,mm7			; mm3=data3H
    410. 

  410. 

  411. 	movq	mm6,[GOTOFF(ebx,PD_DESCALE_P2_4)]	; mm6=[PD_DESCALE_P2_4]
    412. 

  412. 

  413. 	paddd	mm1,mm6
    414. 

  414. 	paddd	mm2,mm6
    415. 

  415. 	psrad	mm1,DESCALE_P2_4
    416. 

  416. 	psrad	mm2,DESCALE_P2_4
    417. 

  417. 	paddd	mm5,mm6
    418. 

  418. 	paddd	mm3,mm6
    419. 

  419. 	psrad	mm5,DESCALE_P2_4
    420. 

  420. 	psrad	mm3,DESCALE_P2_4
    421. 

  421. 

  422. 	packssdw  mm1,mm2		; mm1=data0=(00 10 20 30)
    423. 

  423. 	packssdw  mm5,mm3		; mm5=data3=(03 13 23 33)
    424. 

  424. 

  425. 	movq	mm7, MMWORD [wk(0)]	; mm7=tmp0L
    426. 

  426. 	movq	mm6, MMWORD [wk(1)]	; mm6=tmp0H
    427. 

  427. 

  428. 	movq	mm2,mm4
    429. 

  429. 	movq	mm3,mm0
    430. 

  430. 	paddd	mm4,mm7			; mm4=data1L
    431. 

  431. 	paddd	mm0,mm6			; mm0=data1H
    432. 

  432. 	psubd	mm2,mm7			; mm2=data2L
    433. 

  433. 	psubd	mm3,mm6			; mm3=data2H
    434. 

  434. 

  435. 	movq	mm7,[GOTOFF(ebx,PD_DESCALE_P2_4)]	; mm7=[PD_DESCALE_P2_4]
    436. 

  436. 

  437. 	paddd	mm4,mm7
    438. 

  438. 	paddd	mm0,mm7
    439. 

  439. 	psrad	mm4,DESCALE_P2_4
    440. 

  440. 	psrad	mm0,DESCALE_P2_4
    441. 

  441. 	paddd	mm2,mm7
    442. 

  442. 	paddd	mm3,mm7
    443. 

  443. 	psrad	mm2,DESCALE_P2_4
    444. 

  444. 	psrad	mm3,DESCALE_P2_4
    445. 

  445. 

  446. 	packssdw  mm4,mm0		; mm4=data1=(01 11 21 31)
    447. 

  447. 	packssdw  mm2,mm3		; mm2=data2=(02 12 22 32)
    448. 

  448. 

  449. 	movq      mm6,[GOTOFF(ebx,PB_CENTERJSAMP)]	; mm6=[PB_CENTERJSAMP]
    450. 

  450. 

  451. 	packsswb  mm1,mm2		; mm1=(00 10 20 30 02 12 22 32)
    452. 

  452. 	packsswb  mm4,mm5		; mm4=(01 11 21 31 03 13 23 33)
    453. 

  453. 	paddb     mm1,mm6
    454. 

  454. 	paddb     mm4,mm6
    455. 

  455. 

  456. 	movq      mm7,mm1		; transpose coefficients(phase 1)
    457. 

  457. 	punpcklbw mm1,mm4		; mm1=(00 01 10 11 20 21 30 31)
    458. 

  458. 	punpckhbw mm7,mm4		; mm7=(02 03 12 13 22 23 32 33)
    459. 

  459. 

  460. 	movq      mm0,mm1		; transpose coefficients(phase 2)
    461. 

  461. 	punpcklwd mm1,mm7		; mm1=(00 01 02 03 10 11 12 13)
    462. 

  462. 	punpckhwd mm0,mm7		; mm0=(20 21 22 23 30 31 32 33)
    463. 

  463. 

  464. 	mov	edx, JSAMPROW [edi+0*SIZEOF_JSAMPROW]
    465. 

  465. 	mov	esi, JSAMPROW [edi+2*SIZEOF_JSAMPROW]
    466. 

  466. 	movd	DWORD [edx+eax*SIZEOF_JSAMPLE], mm1
    467. 

  467. 	movd	DWORD [esi+eax*SIZEOF_JSAMPLE], mm0
    468. 

  468. 

  469. 	psrlq	mm1,4*BYTE_BIT
    470. 

  470. 	psrlq	mm0,4*BYTE_BIT
    471. 

  471. 

  472. 	mov	edx, JSAMPROW [edi+1*SIZEOF_JSAMPROW]
    473. 

  473. 	mov	esi, JSAMPROW [edi+3*SIZEOF_JSAMPROW]
    474. 

  474. 	movd	DWORD [edx+eax*SIZEOF_JSAMPLE], mm1
    475. 

  475. 	movd	DWORD [esi+eax*SIZEOF_JSAMPLE], mm0
    476. 

  476. 

  477. 	emms		; empty MMX state
    478. 

  478. 

  479. 	pop	edi
    480. 

  480. 	pop	esi
    481. 

  481. ;	pop	edx		; need not be preserved
    482. 

  482. ;	pop	ecx		; need not be preserved
    483. 

  483. 	poppic	ebx
    484. 

  484. 	mov	esp,ebp		; esp <- aligned ebp
    485. 

  485. 	pop	esp		; esp <- original ebp
    486. 

  486. 	pop	ebp
    487. 

  487. 	ret
    488. 

  488. 

  489. 

  490. ; --------------------------------------------------------------------------
    491. 

  491. ;
    492. 

  492. ; Perform dequantization and inverse DCT on one block of coefficients,
    493. 

  493. ; producing a reduced-size 2x2 output block.
    494. 

  494. ;
    495. 

  495. ; GLOBAL(void)
    496. 

  496. ; jsimd_idct_2x2_mmx (void * dct_table, JCOEFPTR coef_block,
    497. 

  497. ;                     JSAMPARRAY output_buf, JDIMENSION output_col)
    498. 

  498. ;
    499. 

  499. 

  500. %define dct_table(b)	(b)+8			; void * dct_table
    501. 

  501. %define coef_block(b)	(b)+12		; JCOEFPTR coef_block
    502. 

  502. %define output_buf(b)	(b)+16		; JSAMPARRAY output_buf
    503. 

  503. %define output_col(b)	(b)+20		; JDIMENSION output_col
    504. 

  504. 

  505. 	align	16
    506. 

  506. 	global	EXTN(jsimd_idct_2x2_mmx)
    507. 

  507. 

  508. EXTN(jsimd_idct_2x2_mmx):
    509. 

  509. 	push	ebp
    510. 

  510. 	mov	ebp,esp
    511. 

  511. 	push	ebx
    512. 

  512. ;	push	ecx		; need not be preserved
    513. 

  513. ;	push	edx		; need not be preserved
    514. 

  514. 	push	esi
    515. 

  515. 	push	edi
    516. 

  516. 

  517. 	get_GOT	ebx		; get GOT address
    518. 

  518. 

  519. 	; ---- Pass 1: process columns from input.
    520. 

  520. 

  521. 	mov	edx, POINTER [dct_table(ebp)]	; quantptr
    522. 

  522. 	mov	esi, JCOEFPTR [coef_block(ebp)]		; inptr
    523. 

  523. 

  524. 	; | input:                  | result:        |
    525. 

  525. 	; | 00 01 ** 03 ** 05 ** 07 |                |
    526. 

  526. 	; | 10 11 ** 13 ** 15 ** 17 |                |
    527. 

  527. 	; | ** ** ** ** ** ** ** ** |                |
    528. 

  528. 	; | 30 31 ** 33 ** 35 ** 37 | A0 A1 A3 A5 A7 |
    529. 

  529. 	; | ** ** ** ** ** ** ** ** | B0 B1 B3 B5 B7 |
    530. 

  530. 	; | 50 51 ** 53 ** 55 ** 57 |                |
    531. 

  531. 	; | ** ** ** ** ** ** ** ** |                |
    532. 

  532. 	; | 70 71 ** 73 ** 75 ** 77 |                |
    533. 

  533. 

  534. 	; -- Odd part
    535. 

  535. 

  536. 	movq	mm0, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)]
    537. 

  537. 	movq	mm1, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)]
    538. 

  538. 	pmullw	mm0, MMWORD [MMBLOCK(1,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
    539. 

  539. 	pmullw	mm1, MMWORD [MMBLOCK(3,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
    540. 

  540. 	movq	mm2, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)]
    541. 

  541. 	movq	mm3, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)]
    542. 

  542. 	pmullw	mm2, MMWORD [MMBLOCK(5,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
    543. 

  543. 	pmullw	mm3, MMWORD [MMBLOCK(7,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
    544. 

  544. 

  545. 	; mm0=(10 11 ** 13), mm1=(30 31 ** 33)
    546. 

  546. 	; mm2=(50 51 ** 53), mm3=(70 71 ** 73)
    547. 

  547. 

  548. 	pcmpeqd   mm7,mm7
    549. 

  549. 	pslld     mm7,WORD_BIT		; mm7={0x0000 0xFFFF 0x0000 0xFFFF}
    550. 

  550. 

  551. 	movq      mm4,mm0		; mm4=(10 11 ** 13)
    552. 

  552. 	movq      mm5,mm2		; mm5=(50 51 ** 53)
    553. 

  553. 	punpcklwd mm4,mm1		; mm4=(10 30 11 31)
    554. 

  554. 	punpcklwd mm5,mm3		; mm5=(50 70 51 71)
    555. 

  555. 	pmaddwd   mm4,[GOTOFF(ebx,PW_F362_MF127)]
    556. 

  556. 	pmaddwd   mm5,[GOTOFF(ebx,PW_F085_MF072)]
    557. 

  557. 

  558. 	psrld	mm0,WORD_BIT		; mm0=(11 -- 13 --)
    559. 

  559. 	pand	mm1,mm7			; mm1=(-- 31 -- 33)
    560. 

  560. 	psrld	mm2,WORD_BIT		; mm2=(51 -- 53 --)
    561. 

  561. 	pand	mm3,mm7			; mm3=(-- 71 -- 73)
    562. 

  562. 	por	mm0,mm1			; mm0=(11 31 13 33)
    563. 

  563. 	por	mm2,mm3			; mm2=(51 71 53 73)
    564. 

  564. 	pmaddwd	mm0,[GOTOFF(ebx,PW_F362_MF127)]
    565. 

  565. 	pmaddwd	mm2,[GOTOFF(ebx,PW_F085_MF072)]
    566. 

  566. 

  567. 	paddd	mm4,mm5			; mm4=tmp0[col0 col1]
    568. 

  568. 

  569. 	movq	mm6, MMWORD [MMBLOCK(1,1,esi,SIZEOF_JCOEF)]
    570. 

  570. 	movq	mm1, MMWORD [MMBLOCK(3,1,esi,SIZEOF_JCOEF)]
    571. 

  571. 	pmullw	mm6, MMWORD [MMBLOCK(1,1,edx,SIZEOF_ISLOW_MULT_TYPE)]
    572. 

  572. 	pmullw	mm1, MMWORD [MMBLOCK(3,1,edx,SIZEOF_ISLOW_MULT_TYPE)]
    573. 

  573. 	movq	mm3, MMWORD [MMBLOCK(5,1,esi,SIZEOF_JCOEF)]
    574. 

  574. 	movq	mm5, MMWORD [MMBLOCK(7,1,esi,SIZEOF_JCOEF)]
    575. 

  575. 	pmullw	mm3, MMWORD [MMBLOCK(5,1,edx,SIZEOF_ISLOW_MULT_TYPE)]
    576. 

  576. 	pmullw	mm5, MMWORD [MMBLOCK(7,1,edx,SIZEOF_ISLOW_MULT_TYPE)]
    577. 

  577. 

  578. 	; mm6=(** 15 ** 17), mm1=(** 35 ** 37)
    579. 

  579. 	; mm3=(** 55 ** 57), mm5=(** 75 ** 77)
    580. 

  580. 

  581. 	psrld	mm6,WORD_BIT		; mm6=(15 -- 17 --)
    582. 

  582. 	pand	mm1,mm7			; mm1=(-- 35 -- 37)
    583. 

  583. 	psrld	mm3,WORD_BIT		; mm3=(55 -- 57 --)
    584. 

  584. 	pand	mm5,mm7			; mm5=(-- 75 -- 77)
    585. 

  585. 	por	mm6,mm1			; mm6=(15 35 17 37)
    586. 

  586. 	por	mm3,mm5			; mm3=(55 75 57 77)
    587. 

  587. 	pmaddwd	mm6,[GOTOFF(ebx,PW_F362_MF127)]
    588. 

  588. 	pmaddwd	mm3,[GOTOFF(ebx,PW_F085_MF072)]
    589. 

  589. 

  590. 	paddd	mm0,mm2			; mm0=tmp0[col1 col3]
    591. 

  591. 	paddd	mm6,mm3			; mm6=tmp0[col5 col7]
    592. 

  592. 

  593. 	; -- Even part
    594. 

  594. 

  595. 	movq	mm1, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)]
    596. 

  596. 	movq	mm5, MMWORD [MMBLOCK(0,1,esi,SIZEOF_JCOEF)]
    597. 

  597. 	pmullw	mm1, MMWORD [MMBLOCK(0,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
    598. 

  598. 	pmullw	mm5, MMWORD [MMBLOCK(0,1,edx,SIZEOF_ISLOW_MULT_TYPE)]
    599. 

  599. 

  600. 	; mm1=(00 01 ** 03), mm5=(** 05 ** 07)
    601. 

  601. 

  602. 	movq	mm2,mm1				; mm2=(00 01 ** 03)
    603. 

  603. 	pslld	mm1,WORD_BIT			; mm1=(-- 00 -- **)
    604. 

  604. 	psrad	mm1,(WORD_BIT-CONST_BITS-2)	; mm1=tmp10[col0 ****]
    605. 

  605. 

  606. 	pand	mm2,mm7				; mm2=(-- 01 -- 03)
    607. 

  607. 	pand	mm5,mm7				; mm5=(-- 05 -- 07)
    608. 

  608. 	psrad	mm2,(WORD_BIT-CONST_BITS-2)	; mm2=tmp10[col1 col3]
    609. 

  609. 	psrad	mm5,(WORD_BIT-CONST_BITS-2)	; mm5=tmp10[col5 col7]
    610. 

  610. 

  611. 	; -- Final output stage
    612. 

  612. 

  613. 	movq      mm3,mm1
    614. 

  614. 	paddd     mm1,mm4		; mm1=data0[col0 ****]=(A0 **)
    615. 

  615. 	psubd     mm3,mm4		; mm3=data1[col0 ****]=(B0 **)
    616. 

  616. 	punpckldq mm1,mm3		; mm1=(A0 B0)
    617. 

  617. 

  618. 	movq	mm7,[GOTOFF(ebx,PD_DESCALE_P1_2)]	; mm7=[PD_DESCALE_P1_2]
    619. 

  619. 

  620. 	movq	mm4,mm2
    621. 

  621. 	movq	mm3,mm5
    622. 

  622. 	paddd	mm2,mm0			; mm2=data0[col1 col3]=(A1 A3)
    623. 

  623. 	paddd	mm5,mm6			; mm5=data0[col5 col7]=(A5 A7)
    624. 

  624. 	psubd	mm4,mm0			; mm4=data1[col1 col3]=(B1 B3)
    625. 

  625. 	psubd	mm3,mm6			; mm3=data1[col5 col7]=(B5 B7)
    626. 

  626. 

  627. 	paddd	mm1,mm7
    628. 

  628. 	psrad	mm1,DESCALE_P1_2
    629. 

  629. 

  630. 	paddd	mm2,mm7
    631. 

  631. 	paddd	mm5,mm7
    632. 

  632. 	psrad	mm2,DESCALE_P1_2
    633. 

  633. 	psrad	mm5,DESCALE_P1_2
    634. 

  634. 	paddd	mm4,mm7
    635. 

  635. 	paddd	mm3,mm7
    636. 

  636. 	psrad	mm4,DESCALE_P1_2
    637. 

  637. 	psrad	mm3,DESCALE_P1_2
    638. 

  638. 

  639. 	; ---- Pass 2: process rows, store into output array.
    640. 

  640. 

  641. 	mov	edi, JSAMPARRAY [output_buf(ebp)]	; (JSAMPROW *)
    642. 

  642. 	mov	eax, JDIMENSION [output_col(ebp)]
    643. 

  643. 

  644. 	; | input:| result:|
    645. 

  645. 	; | A0 B0 |        |
    646. 

  646. 	; | A1 B1 | C0 C1  |
    647. 

  647. 	; | A3 B3 | D0 D1  |
    648. 

  648. 	; | A5 B5 |        |
    649. 

  649. 	; | A7 B7 |        |
    650. 

  650. 

  651. 	; -- Odd part
    652. 

  652. 

  653. 	packssdw  mm2,mm4		; mm2=(A1 A3 B1 B3)
    654. 

  654. 	packssdw  mm5,mm3		; mm5=(A5 A7 B5 B7)
    655. 

  655. 	pmaddwd   mm2,[GOTOFF(ebx,PW_F362_MF127)]
    656. 

  656. 	pmaddwd   mm5,[GOTOFF(ebx,PW_F085_MF072)]
    657. 

  657. 

  658. 	paddd     mm2,mm5		; mm2=tmp0[row0 row1]
    659. 

  659. 

  660. 	; -- Even part
    661. 

  661. 

  662. 	pslld     mm1,(CONST_BITS+2)	; mm1=tmp10[row0 row1]
    663. 

  663. 

  664. 	; -- Final output stage
    665. 

  665. 

  666. 	movq      mm0,[GOTOFF(ebx,PD_DESCALE_P2_2)]	; mm0=[PD_DESCALE_P2_2]
    667. 

  667. 

  668. 	movq      mm6,mm1
    669. 

  669. 	paddd     mm1,mm2		; mm1=data0[row0 row1]=(C0 C1)
    670. 

  670. 	psubd     mm6,mm2		; mm6=data1[row0 row1]=(D0 D1)
    671. 

  671. 

  672. 	paddd     mm1,mm0
    673. 

  673. 	paddd     mm6,mm0
    674. 

  674. 	psrad     mm1,DESCALE_P2_2
    675. 

  675. 	psrad     mm6,DESCALE_P2_2
    676. 

  676. 

  677. 	movq      mm7,mm1		; transpose coefficients
    678. 

  678. 	punpckldq mm1,mm6		; mm1=(C0 D0)
    679. 

  679. 	punpckhdq mm7,mm6		; mm7=(C1 D1)
    680. 

  680. 

  681. 	packssdw  mm1,mm7		; mm1=(C0 D0 C1 D1)
    682. 

  682. 	packsswb  mm1,mm1		; mm1=(C0 D0 C1 D1 C0 D0 C1 D1)
    683. 

  683. 	paddb     mm1,[GOTOFF(ebx,PB_CENTERJSAMP)]
    684. 

  684. 

  685. 	movd	ecx,mm1
    686. 

  686. 	movd	ebx,mm1			; ebx=(C0 D0 C1 D1)
    687. 

  687. 	shr	ecx,2*BYTE_BIT		; ecx=(C1 D1 -- --)
    688. 

  688. 

  689. 	mov	edx, JSAMPROW [edi+0*SIZEOF_JSAMPROW]
    690. 

  690. 	mov	esi, JSAMPROW [edi+1*SIZEOF_JSAMPROW]
    691. 

  691. 	mov	WORD [edx+eax*SIZEOF_JSAMPLE], bx
    692. 

  692. 	mov	WORD [esi+eax*SIZEOF_JSAMPLE], cx
    693. 

  693. 

  694. 	emms		; empty MMX state
    695. 

  695. 

  696. 	pop	edi
    697. 

  697. 	pop	esi
    698. 

  698. ;	pop	edx		; need not be preserved
    699. 

  699. ;	pop	ecx		; need not be preserved
    700. 

  700. 	pop	ebx
    701. 

  701. 	pop	ebp
    702. 

  702. 	ret
    703. 

  703. 

  704. ; For some reason, the OS X linker does not honor the request to align the
    705. 

  705. ; segment unless we do this.
    706. 

  706. 	align	16
    707.