/media/libjpeg/simd/jimmxfst.asm

http://github.com/zpao/v8monkey · Assembly · 500 lines · 345 code · 87 blank · 68 comment · 2 complexity · 00f86e2bd3ebfb7fe17210e27bc3c852 MD5 · raw file 

    

  1. ;
    2. 

  2. ; jimmxfst.asm - fast integer 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 a fast, not so accurate integer implementation of
    18. 

  18. ; the inverse DCT (Discrete Cosine Transform). The following code is
    19. 

  19. ; based directly on the IJG's original jidctfst.c; see the jidctfst.c
    20. 

  20. ; 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	8	; 14 is also OK.
    30. 

  30. %define PASS1_BITS	2
    31. 

  31. 

  32. %if IFAST_SCALE_BITS != PASS1_BITS
    33. 

  33. %error "'IFAST_SCALE_BITS' must be equal to 'PASS1_BITS'."
    34. 

  34. %endif
    35. 

  35. 

  36. %if CONST_BITS == 8
    37. 

  37. F_1_082	equ	277		; FIX(1.082392200)
    38. 

  38. F_1_414	equ	362		; FIX(1.414213562)
    39. 

  39. F_1_847	equ	473		; FIX(1.847759065)
    40. 

  40. F_2_613	equ	669		; FIX(2.613125930)
    41. 

  41. F_1_613	equ	(F_2_613 - 256)	; FIX(2.613125930) - FIX(1)
    42. 

  42. %else
    43. 

  43. ; NASM cannot do compile-time arithmetic on floating-point constants.
    44. 

  44. %define	DESCALE(x,n)  (((x)+(1<<((n)-1)))>>(n))
    45. 

  45. F_1_082	equ	DESCALE(1162209775,30-CONST_BITS)	; FIX(1.082392200)
    46. 

  46. F_1_414	equ	DESCALE(1518500249,30-CONST_BITS)	; FIX(1.414213562)
    47. 

  47. F_1_847	equ	DESCALE(1984016188,30-CONST_BITS)	; FIX(1.847759065)
    48. 

  48. F_2_613	equ	DESCALE(2805822602,30-CONST_BITS)	; FIX(2.613125930)
    49. 

  49. F_1_613	equ	(F_2_613 - (1 << CONST_BITS))	; FIX(2.613125930) - FIX(1)
    50. 

  50. %endif
    51. 

  51. 

  52. ; --------------------------------------------------------------------------
    53. 

  53. 	SECTION	SEG_CONST
    54. 

  54. 

  55. ; PRE_MULTIPLY_SCALE_BITS <= 2 (to avoid overflow)
    56. 

  56. ; CONST_BITS + CONST_SHIFT + PRE_MULTIPLY_SCALE_BITS == 16 (for pmulhw)
    57. 

  57. 

  58. %define PRE_MULTIPLY_SCALE_BITS   2
    59. 

  59. %define CONST_SHIFT     (16 - PRE_MULTIPLY_SCALE_BITS - CONST_BITS)
    60. 

  60. 

  61. 	alignz	16
    62. 

  62. 	global	EXTN(jconst_idct_ifast_mmx)
    63. 

  63. 

  64. EXTN(jconst_idct_ifast_mmx):
    65. 

  65. 

  66. PW_F1414	times 4 dw  F_1_414 << CONST_SHIFT
    67. 

  67. PW_F1847	times 4 dw  F_1_847 << CONST_SHIFT
    68. 

  68. PW_MF1613	times 4 dw -F_1_613 << CONST_SHIFT
    69. 

  69. PW_F1082	times 4 dw  F_1_082 << CONST_SHIFT
    70. 

  70. PB_CENTERJSAMP	times 8 db  CENTERJSAMPLE
    71. 

  71. 

  72. 	alignz	16
    73. 

  73. 

  74. ; --------------------------------------------------------------------------
    75. 

  75. 	SECTION	SEG_TEXT
    76. 

  76. 	BITS	32
    77. 

  77. ;
    78. 

  78. ; Perform dequantization and inverse DCT on one block of coefficients.
    79. 

  79. ;
    80. 

  80. ; GLOBAL(void)
    81. 

  81. ; jsimd_idct_ifast_mmx (void * dct_table, JCOEFPTR coef_block,
    82. 

  82. ;                       JSAMPARRAY output_buf, JDIMENSION output_col)
    83. 

  83. ;
    84. 

  84. 

  85. %define dct_table(b)	(b)+8			; jpeg_component_info * compptr
    86. 

  86. %define coef_block(b)	(b)+12		; JCOEFPTR coef_block
    87. 

  87. %define output_buf(b)	(b)+16		; JSAMPARRAY output_buf
    88. 

  88. %define output_col(b)	(b)+20		; JDIMENSION output_col
    89. 

  89. 

  90. %define original_ebp	ebp+0
    91. 

  91. %define wk(i)		ebp-(WK_NUM-(i))*SIZEOF_MMWORD	; mmword wk[WK_NUM]
    92. 

  92. %define WK_NUM		2
    93. 

  93. %define workspace	wk(0)-DCTSIZE2*SIZEOF_JCOEF
    94. 

  94. 					; JCOEF workspace[DCTSIZE2]
    95. 

  95. 

  96. 	align	16
    97. 

  97. 	global	EXTN(jsimd_idct_ifast_mmx)
    98. 

  98. 

  99. EXTN(jsimd_idct_ifast_mmx):
    100. 

  100. 	push	ebp
    101. 

  101. 	mov	eax,esp				; eax = original ebp
    102. 

  102. 	sub	esp, byte 4
    103. 

  103. 	and	esp, byte (-SIZEOF_MMWORD)	; align to 64 bits
    104. 

  104. 	mov	[esp],eax
    105. 

  105. 	mov	ebp,esp				; ebp = aligned ebp
    106. 

  106. 	lea	esp, [workspace]
    107. 

  107. 	push	ebx
    108. 

  108. ;	push	ecx		; need not be preserved
    109. 

  109. ;	push	edx		; need not be preserved
    110. 

  110. 	push	esi
    111. 

  111. 	push	edi
    112. 

  112. 

  113. 	get_GOT	ebx		; get GOT address
    114. 

  114. 

  115. 	; ---- Pass 1: process columns from input, store into work array.
    116. 

  116. 

  117. ;	mov	eax, [original_ebp]
    118. 

  118. 	mov	edx, POINTER [dct_table(eax)]	; quantptr
    119. 

  119. 	mov	esi, JCOEFPTR [coef_block(eax)]		; inptr
    120. 

  120. 	lea	edi, [workspace]			; JCOEF * wsptr
    121. 

  121. 	mov	ecx, DCTSIZE/4				; ctr
    122. 

  122. 	alignx	16,7
    123. 

  123. .columnloop:
    124. 

  124. %ifndef NO_ZERO_COLUMN_TEST_IFAST_MMX
    125. 

  125. 	mov	eax, DWORD [DWBLOCK(1,0,esi,SIZEOF_JCOEF)]
    126. 

  126. 	or	eax, DWORD [DWBLOCK(2,0,esi,SIZEOF_JCOEF)]
    127. 

  127. 	jnz	short .columnDCT
    128. 

  128. 

  129. 	movq	mm0, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)]
    130. 

  130. 	movq	mm1, MMWORD [MMBLOCK(2,0,esi,SIZEOF_JCOEF)]
    131. 

  131. 	por	mm0, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)]
    132. 

  132. 	por	mm1, MMWORD [MMBLOCK(4,0,esi,SIZEOF_JCOEF)]
    133. 

  133. 	por	mm0, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)]
    134. 

  134. 	por	mm1, MMWORD [MMBLOCK(6,0,esi,SIZEOF_JCOEF)]
    135. 

  135. 	por	mm0, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)]
    136. 

  136. 	por	mm1,mm0
    137. 

  137. 	packsswb mm1,mm1
    138. 

  138. 	movd	eax,mm1
    139. 

  139. 	test	eax,eax
    140. 

  140. 	jnz	short .columnDCT
    141. 

  141. 

  142. 	; -- AC terms all zero
    143. 

  143. 

  144. 	movq	mm0, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)]
    145. 

  145. 	pmullw	mm0, MMWORD [MMBLOCK(0,0,edx,SIZEOF_IFAST_MULT_TYPE)]
    146. 

  146. 

  147. 	movq      mm2,mm0		; mm0=in0=(00 01 02 03)
    148. 

  148. 	punpcklwd mm0,mm0		; mm0=(00 00 01 01)
    149. 

  149. 	punpckhwd mm2,mm2		; mm2=(02 02 03 03)
    150. 

  150. 

  151. 	movq      mm1,mm0
    152. 

  152. 	punpckldq mm0,mm0		; mm0=(00 00 00 00)
    153. 

  153. 	punpckhdq mm1,mm1		; mm1=(01 01 01 01)
    154. 

  154. 	movq      mm3,mm2
    155. 

  155. 	punpckldq mm2,mm2		; mm2=(02 02 02 02)
    156. 

  156. 	punpckhdq mm3,mm3		; mm3=(03 03 03 03)
    157. 

  157. 

  158. 	movq	MMWORD [MMBLOCK(0,0,edi,SIZEOF_JCOEF)], mm0
    159. 

  159. 	movq	MMWORD [MMBLOCK(0,1,edi,SIZEOF_JCOEF)], mm0
    160. 

  160. 	movq	MMWORD [MMBLOCK(1,0,edi,SIZEOF_JCOEF)], mm1
    161. 

  161. 	movq	MMWORD [MMBLOCK(1,1,edi,SIZEOF_JCOEF)], mm1
    162. 

  162. 	movq	MMWORD [MMBLOCK(2,0,edi,SIZEOF_JCOEF)], mm2
    163. 

  163. 	movq	MMWORD [MMBLOCK(2,1,edi,SIZEOF_JCOEF)], mm2
    164. 

  164. 	movq	MMWORD [MMBLOCK(3,0,edi,SIZEOF_JCOEF)], mm3
    165. 

  165. 	movq	MMWORD [MMBLOCK(3,1,edi,SIZEOF_JCOEF)], mm3
    166. 

  166. 	jmp	near .nextcolumn
    167. 

  167. 	alignx	16,7
    168. 

  168. %endif
    169. 

  169. .columnDCT:
    170. 

  170. 

  171. 	; -- Even part
    172. 

  172. 

  173. 	movq	mm0, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)]
    174. 

  174. 	movq	mm1, MMWORD [MMBLOCK(2,0,esi,SIZEOF_JCOEF)]
    175. 

  175. 	pmullw	mm0, MMWORD [MMBLOCK(0,0,edx,SIZEOF_IFAST_MULT_TYPE)]
    176. 

  176. 	pmullw	mm1, MMWORD [MMBLOCK(2,0,edx,SIZEOF_IFAST_MULT_TYPE)]
    177. 

  177. 	movq	mm2, MMWORD [MMBLOCK(4,0,esi,SIZEOF_JCOEF)]
    178. 

  178. 	movq	mm3, MMWORD [MMBLOCK(6,0,esi,SIZEOF_JCOEF)]
    179. 

  179. 	pmullw	mm2, MMWORD [MMBLOCK(4,0,edx,SIZEOF_IFAST_MULT_TYPE)]
    180. 

  180. 	pmullw	mm3, MMWORD [MMBLOCK(6,0,edx,SIZEOF_IFAST_MULT_TYPE)]
    181. 

  181. 

  182. 	movq	mm4,mm0
    183. 

  183. 	movq	mm5,mm1
    184. 

  184. 	psubw	mm0,mm2			; mm0=tmp11
    185. 

  185. 	psubw	mm1,mm3
    186. 

  186. 	paddw	mm4,mm2			; mm4=tmp10
    187. 

  187. 	paddw	mm5,mm3			; mm5=tmp13
    188. 

  188. 

  189. 	psllw	mm1,PRE_MULTIPLY_SCALE_BITS
    190. 

  190. 	pmulhw	mm1,[GOTOFF(ebx,PW_F1414)]
    191. 

  191. 	psubw	mm1,mm5			; mm1=tmp12
    192. 

  192. 

  193. 	movq	mm6,mm4
    194. 

  194. 	movq	mm7,mm0
    195. 

  195. 	psubw	mm4,mm5			; mm4=tmp3
    196. 

  196. 	psubw	mm0,mm1			; mm0=tmp2
    197. 

  197. 	paddw	mm6,mm5			; mm6=tmp0
    198. 

  198. 	paddw	mm7,mm1			; mm7=tmp1
    199. 

  199. 

  200. 	movq	MMWORD [wk(1)], mm4	; wk(1)=tmp3
    201. 

  201. 	movq	MMWORD [wk(0)], mm0	; wk(0)=tmp2
    202. 

  202. 

  203. 	; -- Odd part
    204. 

  204. 

  205. 	movq	mm2, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)]
    206. 

  206. 	movq	mm3, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)]
    207. 

  207. 	pmullw	mm2, MMWORD [MMBLOCK(1,0,edx,SIZEOF_IFAST_MULT_TYPE)]
    208. 

  208. 	pmullw	mm3, MMWORD [MMBLOCK(3,0,edx,SIZEOF_IFAST_MULT_TYPE)]
    209. 

  209. 	movq	mm5, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)]
    210. 

  210. 	movq	mm1, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)]
    211. 

  211. 	pmullw	mm5, MMWORD [MMBLOCK(5,0,edx,SIZEOF_IFAST_MULT_TYPE)]
    212. 

  212. 	pmullw	mm1, MMWORD [MMBLOCK(7,0,edx,SIZEOF_IFAST_MULT_TYPE)]
    213. 

  213. 

  214. 	movq	mm4,mm2
    215. 

  215. 	movq	mm0,mm5
    216. 

  216. 	psubw	mm2,mm1			; mm2=z12
    217. 

  217. 	psubw	mm5,mm3			; mm5=z10
    218. 

  218. 	paddw	mm4,mm1			; mm4=z11
    219. 

  219. 	paddw	mm0,mm3			; mm0=z13
    220. 

  220. 

  221. 	movq	mm1,mm5			; mm1=z10(unscaled)
    222. 

  222. 	psllw	mm2,PRE_MULTIPLY_SCALE_BITS
    223. 

  223. 	psllw	mm5,PRE_MULTIPLY_SCALE_BITS
    224. 

  224. 

  225. 	movq	mm3,mm4
    226. 

  226. 	psubw	mm4,mm0
    227. 

  227. 	paddw	mm3,mm0			; mm3=tmp7
    228. 

  228. 

  229. 	psllw	mm4,PRE_MULTIPLY_SCALE_BITS
    230. 

  230. 	pmulhw	mm4,[GOTOFF(ebx,PW_F1414)]	; mm4=tmp11
    231. 

  231. 

  232. 	; To avoid overflow...
    233. 

  233. 	;
    234. 

  234. 	; (Original)
    235. 

  235. 	; tmp12 = -2.613125930 * z10 + z5;
    236. 

  236. 	;
    237. 

  237. 	; (This implementation)
    238. 

  238. 	; tmp12 = (-1.613125930 - 1) * z10 + z5;
    239. 

  239. 	;       = -1.613125930 * z10 - z10 + z5;
    240. 

  240. 

  241. 	movq	mm0,mm5
    242. 

  242. 	paddw	mm5,mm2
    243. 

  243. 	pmulhw	mm5,[GOTOFF(ebx,PW_F1847)]	; mm5=z5
    244. 

  244. 	pmulhw	mm0,[GOTOFF(ebx,PW_MF1613)]
    245. 

  245. 	pmulhw	mm2,[GOTOFF(ebx,PW_F1082)]
    246. 

  246. 	psubw	mm0,mm1
    247. 

  247. 	psubw	mm2,mm5			; mm2=tmp10
    248. 

  248. 	paddw	mm0,mm5			; mm0=tmp12
    249. 

  249. 

  250. 	; -- Final output stage
    251. 

  251. 

  252. 	psubw	mm0,mm3			; mm0=tmp6
    253. 

  253. 	movq	mm1,mm6
    254. 

  254. 	movq	mm5,mm7
    255. 

  255. 	paddw	mm6,mm3			; mm6=data0=(00 01 02 03)
    256. 

  256. 	paddw	mm7,mm0			; mm7=data1=(10 11 12 13)
    257. 

  257. 	psubw	mm1,mm3			; mm1=data7=(70 71 72 73)
    258. 

  258. 	psubw	mm5,mm0			; mm5=data6=(60 61 62 63)
    259. 

  259. 	psubw	mm4,mm0			; mm4=tmp5
    260. 

  260. 

  261. 	movq      mm3,mm6		; transpose coefficients(phase 1)
    262. 

  262. 	punpcklwd mm6,mm7		; mm6=(00 10 01 11)
    263. 

  263. 	punpckhwd mm3,mm7		; mm3=(02 12 03 13)
    264. 

  264. 	movq      mm0,mm5		; transpose coefficients(phase 1)
    265. 

  265. 	punpcklwd mm5,mm1		; mm5=(60 70 61 71)
    266. 

  266. 	punpckhwd mm0,mm1		; mm0=(62 72 63 73)
    267. 

  267. 

  268. 	movq	mm7, MMWORD [wk(0)]	; mm7=tmp2
    269. 

  269. 	movq	mm1, MMWORD [wk(1)]	; mm1=tmp3
    270. 

  270. 

  271. 	movq	MMWORD [wk(0)], mm5	; wk(0)=(60 70 61 71)
    272. 

  272. 	movq	MMWORD [wk(1)], mm0	; wk(1)=(62 72 63 73)
    273. 

  273. 

  274. 	paddw	mm2,mm4			; mm2=tmp4
    275. 

  275. 	movq	mm5,mm7
    276. 

  276. 	movq	mm0,mm1
    277. 

  277. 	paddw	mm7,mm4			; mm7=data2=(20 21 22 23)
    278. 

  278. 	paddw	mm1,mm2			; mm1=data4=(40 41 42 43)
    279. 

  279. 	psubw	mm5,mm4			; mm5=data5=(50 51 52 53)
    280. 

  280. 	psubw	mm0,mm2			; mm0=data3=(30 31 32 33)
    281. 

  281. 

  282. 	movq      mm4,mm7		; transpose coefficients(phase 1)
    283. 

  283. 	punpcklwd mm7,mm0		; mm7=(20 30 21 31)
    284. 

  284. 	punpckhwd mm4,mm0		; mm4=(22 32 23 33)
    285. 

  285. 	movq      mm2,mm1		; transpose coefficients(phase 1)
    286. 

  286. 	punpcklwd mm1,mm5		; mm1=(40 50 41 51)
    287. 

  287. 	punpckhwd mm2,mm5		; mm2=(42 52 43 53)
    288. 

  288. 

  289. 	movq      mm0,mm6		; transpose coefficients(phase 2)
    290. 

  290. 	punpckldq mm6,mm7		; mm6=(00 10 20 30)
    291. 

  291. 	punpckhdq mm0,mm7		; mm0=(01 11 21 31)
    292. 

  292. 	movq      mm5,mm3		; transpose coefficients(phase 2)
    293. 

  293. 	punpckldq mm3,mm4		; mm3=(02 12 22 32)
    294. 

  294. 	punpckhdq mm5,mm4		; mm5=(03 13 23 33)
    295. 

  295. 

  296. 	movq	mm7, MMWORD [wk(0)]	; mm7=(60 70 61 71)
    297. 

  297. 	movq	mm4, MMWORD [wk(1)]	; mm4=(62 72 63 73)
    298. 

  298. 

  299. 	movq	MMWORD [MMBLOCK(0,0,edi,SIZEOF_JCOEF)], mm6
    300. 

  300. 	movq	MMWORD [MMBLOCK(1,0,edi,SIZEOF_JCOEF)], mm0
    301. 

  301. 	movq	MMWORD [MMBLOCK(2,0,edi,SIZEOF_JCOEF)], mm3
    302. 

  302. 	movq	MMWORD [MMBLOCK(3,0,edi,SIZEOF_JCOEF)], mm5
    303. 

  303. 

  304. 	movq      mm6,mm1		; transpose coefficients(phase 2)
    305. 

  305. 	punpckldq mm1,mm7		; mm1=(40 50 60 70)
    306. 

  306. 	punpckhdq mm6,mm7		; mm6=(41 51 61 71)
    307. 

  307. 	movq      mm0,mm2		; transpose coefficients(phase 2)
    308. 

  308. 	punpckldq mm2,mm4		; mm2=(42 52 62 72)
    309. 

  309. 	punpckhdq mm0,mm4		; mm0=(43 53 63 73)
    310. 

  310. 

  311. 	movq	MMWORD [MMBLOCK(0,1,edi,SIZEOF_JCOEF)], mm1
    312. 

  312. 	movq	MMWORD [MMBLOCK(1,1,edi,SIZEOF_JCOEF)], mm6
    313. 

  313. 	movq	MMWORD [MMBLOCK(2,1,edi,SIZEOF_JCOEF)], mm2
    314. 

  314. 	movq	MMWORD [MMBLOCK(3,1,edi,SIZEOF_JCOEF)], mm0
    315. 

  315. 

  316. .nextcolumn:
    317. 

  317. 	add	esi, byte 4*SIZEOF_JCOEF		; coef_block
    318. 

  318. 	add	edx, byte 4*SIZEOF_IFAST_MULT_TYPE	; quantptr
    319. 

  319. 	add	edi, byte 4*DCTSIZE*SIZEOF_JCOEF	; wsptr
    320. 

  320. 	dec	ecx					; ctr
    321. 

  321. 	jnz	near .columnloop
    322. 

  322. 

  323. 	; ---- Pass 2: process rows from work array, store into output array.
    324. 

  324. 

  325. 	mov	eax, [original_ebp]
    326. 

  326. 	lea	esi, [workspace]			; JCOEF * wsptr
    327. 

  327. 	mov	edi, JSAMPARRAY [output_buf(eax)]	; (JSAMPROW *)
    328. 

  328. 	mov	eax, JDIMENSION [output_col(eax)]
    329. 

  329. 	mov	ecx, DCTSIZE/4				; ctr
    330. 

  330. 	alignx	16,7
    331. 

  331. .rowloop:
    332. 

  332. 

  333. 	; -- Even part
    334. 

  334. 

  335. 	movq	mm0, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)]
    336. 

  336. 	movq	mm1, MMWORD [MMBLOCK(2,0,esi,SIZEOF_JCOEF)]
    337. 

  337. 	movq	mm2, MMWORD [MMBLOCK(4,0,esi,SIZEOF_JCOEF)]
    338. 

  338. 	movq	mm3, MMWORD [MMBLOCK(6,0,esi,SIZEOF_JCOEF)]
    339. 

  339. 

  340. 	movq	mm4,mm0
    341. 

  341. 	movq	mm5,mm1
    342. 

  342. 	psubw	mm0,mm2			; mm0=tmp11
    343. 

  343. 	psubw	mm1,mm3
    344. 

  344. 	paddw	mm4,mm2			; mm4=tmp10
    345. 

  345. 	paddw	mm5,mm3			; mm5=tmp13
    346. 

  346. 

  347. 	psllw	mm1,PRE_MULTIPLY_SCALE_BITS
    348. 

  348. 	pmulhw	mm1,[GOTOFF(ebx,PW_F1414)]
    349. 

  349. 	psubw	mm1,mm5			; mm1=tmp12
    350. 

  350. 

  351. 	movq	mm6,mm4
    352. 

  352. 	movq	mm7,mm0
    353. 

  353. 	psubw	mm4,mm5			; mm4=tmp3
    354. 

  354. 	psubw	mm0,mm1			; mm0=tmp2
    355. 

  355. 	paddw	mm6,mm5			; mm6=tmp0
    356. 

  356. 	paddw	mm7,mm1			; mm7=tmp1
    357. 

  357. 

  358. 	movq	MMWORD [wk(1)], mm4	; wk(1)=tmp3
    359. 

  359. 	movq	MMWORD [wk(0)], mm0	; wk(0)=tmp2
    360. 

  360. 

  361. 	; -- Odd part
    362. 

  362. 

  363. 	movq	mm2, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)]
    364. 

  364. 	movq	mm3, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)]
    365. 

  365. 	movq	mm5, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)]
    366. 

  366. 	movq	mm1, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)]
    367. 

  367. 

  368. 	movq	mm4,mm2
    369. 

  369. 	movq	mm0,mm5
    370. 

  370. 	psubw	mm2,mm1			; mm2=z12
    371. 

  371. 	psubw	mm5,mm3			; mm5=z10
    372. 

  372. 	paddw	mm4,mm1			; mm4=z11
    373. 

  373. 	paddw	mm0,mm3			; mm0=z13
    374. 

  374. 

  375. 	movq	mm1,mm5			; mm1=z10(unscaled)
    376. 

  376. 	psllw	mm2,PRE_MULTIPLY_SCALE_BITS
    377. 

  377. 	psllw	mm5,PRE_MULTIPLY_SCALE_BITS
    378. 

  378. 

  379. 	movq	mm3,mm4
    380. 

  380. 	psubw	mm4,mm0
    381. 

  381. 	paddw	mm3,mm0			; mm3=tmp7
    382. 

  382. 

  383. 	psllw	mm4,PRE_MULTIPLY_SCALE_BITS
    384. 

  384. 	pmulhw	mm4,[GOTOFF(ebx,PW_F1414)]	; mm4=tmp11
    385. 

  385. 

  386. 	; To avoid overflow...
    387. 

  387. 	;
    388. 

  388. 	; (Original)
    389. 

  389. 	; tmp12 = -2.613125930 * z10 + z5;
    390. 

  390. 	;
    391. 

  391. 	; (This implementation)
    392. 

  392. 	; tmp12 = (-1.613125930 - 1) * z10 + z5;
    393. 

  393. 	;       = -1.613125930 * z10 - z10 + z5;
    394. 

  394. 

  395. 	movq	mm0,mm5
    396. 

  396. 	paddw	mm5,mm2
    397. 

  397. 	pmulhw	mm5,[GOTOFF(ebx,PW_F1847)]	; mm5=z5
    398. 

  398. 	pmulhw	mm0,[GOTOFF(ebx,PW_MF1613)]
    399. 

  399. 	pmulhw	mm2,[GOTOFF(ebx,PW_F1082)]
    400. 

  400. 	psubw	mm0,mm1
    401. 

  401. 	psubw	mm2,mm5			; mm2=tmp10
    402. 

  402. 	paddw	mm0,mm5			; mm0=tmp12
    403. 

  403. 

  404. 	; -- Final output stage
    405. 

  405. 

  406. 	psubw	mm0,mm3			; mm0=tmp6
    407. 

  407. 	movq	mm1,mm6
    408. 

  408. 	movq	mm5,mm7
    409. 

  409. 	paddw	mm6,mm3			; mm6=data0=(00 10 20 30)
    410. 

  410. 	paddw	mm7,mm0			; mm7=data1=(01 11 21 31)
    411. 

  411. 	psraw	mm6,(PASS1_BITS+3)	; descale
    412. 

  412. 	psraw	mm7,(PASS1_BITS+3)	; descale
    413. 

  413. 	psubw	mm1,mm3			; mm1=data7=(07 17 27 37)
    414. 

  414. 	psubw	mm5,mm0			; mm5=data6=(06 16 26 36)
    415. 

  415. 	psraw	mm1,(PASS1_BITS+3)	; descale
    416. 

  416. 	psraw	mm5,(PASS1_BITS+3)	; descale
    417. 

  417. 	psubw	mm4,mm0			; mm4=tmp5
    418. 

  418. 

  419. 	packsswb  mm6,mm5		; mm6=(00 10 20 30 06 16 26 36)
    420. 

  420. 	packsswb  mm7,mm1		; mm7=(01 11 21 31 07 17 27 37)
    421. 

  421. 

  422. 	movq	mm3, MMWORD [wk(0)]	; mm3=tmp2
    423. 

  423. 	movq	mm0, MMWORD [wk(1)]	; mm0=tmp3
    424. 

  424. 

  425. 	paddw	mm2,mm4			; mm2=tmp4
    426. 

  426. 	movq	mm5,mm3
    427. 

  427. 	movq	mm1,mm0
    428. 

  428. 	paddw	mm3,mm4			; mm3=data2=(02 12 22 32)
    429. 

  429. 	paddw	mm0,mm2			; mm0=data4=(04 14 24 34)
    430. 

  430. 	psraw	mm3,(PASS1_BITS+3)	; descale
    431. 

  431. 	psraw	mm0,(PASS1_BITS+3)	; descale
    432. 

  432. 	psubw	mm5,mm4			; mm5=data5=(05 15 25 35)
    433. 

  433. 	psubw	mm1,mm2			; mm1=data3=(03 13 23 33)
    434. 

  434. 	psraw	mm5,(PASS1_BITS+3)	; descale
    435. 

  435. 	psraw	mm1,(PASS1_BITS+3)	; descale
    436. 

  436. 

  437. 	movq      mm4,[GOTOFF(ebx,PB_CENTERJSAMP)]	; mm4=[PB_CENTERJSAMP]
    438. 

  438. 

  439. 	packsswb  mm3,mm0		; mm3=(02 12 22 32 04 14 24 34)
    440. 

  440. 	packsswb  mm1,mm5		; mm1=(03 13 23 33 05 15 25 35)
    441. 

  441. 

  442. 	paddb     mm6,mm4
    443. 

  443. 	paddb     mm7,mm4
    444. 

  444. 	paddb     mm3,mm4
    445. 

  445. 	paddb     mm1,mm4
    446. 

  446. 

  447. 	movq      mm2,mm6		; transpose coefficients(phase 1)
    448. 

  448. 	punpcklbw mm6,mm7		; mm6=(00 01 10 11 20 21 30 31)
    449. 

  449. 	punpckhbw mm2,mm7		; mm2=(06 07 16 17 26 27 36 37)
    450. 

  450. 	movq      mm0,mm3		; transpose coefficients(phase 1)
    451. 

  451. 	punpcklbw mm3,mm1		; mm3=(02 03 12 13 22 23 32 33)
    452. 

  452. 	punpckhbw mm0,mm1		; mm0=(04 05 14 15 24 25 34 35)
    453. 

  453. 

  454. 	movq      mm5,mm6		; transpose coefficients(phase 2)
    455. 

  455. 	punpcklwd mm6,mm3		; mm6=(00 01 02 03 10 11 12 13)
    456. 

  456. 	punpckhwd mm5,mm3		; mm5=(20 21 22 23 30 31 32 33)
    457. 

  457. 	movq      mm4,mm0		; transpose coefficients(phase 2)
    458. 

  458. 	punpcklwd mm0,mm2		; mm0=(04 05 06 07 14 15 16 17)
    459. 

  459. 	punpckhwd mm4,mm2		; mm4=(24 25 26 27 34 35 36 37)
    460. 

  460. 

  461. 	movq      mm7,mm6		; transpose coefficients(phase 3)
    462. 

  462. 	punpckldq mm6,mm0		; mm6=(00 01 02 03 04 05 06 07)
    463. 

  463. 	punpckhdq mm7,mm0		; mm7=(10 11 12 13 14 15 16 17)
    464. 

  464. 	movq      mm1,mm5		; transpose coefficients(phase 3)
    465. 

  465. 	punpckldq mm5,mm4		; mm5=(20 21 22 23 24 25 26 27)
    466. 

  466. 	punpckhdq mm1,mm4		; mm1=(30 31 32 33 34 35 36 37)
    467. 

  467. 

  468. 	pushpic	ebx			; save GOT address
    469. 

  469. 

  470. 	mov	edx, JSAMPROW [edi+0*SIZEOF_JSAMPROW]
    471. 

  471. 	mov	ebx, JSAMPROW [edi+1*SIZEOF_JSAMPROW]
    472. 

  472. 	movq	MMWORD [edx+eax*SIZEOF_JSAMPLE], mm6
    473. 

  473. 	movq	MMWORD [ebx+eax*SIZEOF_JSAMPLE], mm7
    474. 

  474. 	mov	edx, JSAMPROW [edi+2*SIZEOF_JSAMPROW]
    475. 

  475. 	mov	ebx, JSAMPROW [edi+3*SIZEOF_JSAMPROW]
    476. 

  476. 	movq	MMWORD [edx+eax*SIZEOF_JSAMPLE], mm5
    477. 

  477. 	movq	MMWORD [ebx+eax*SIZEOF_JSAMPLE], mm1
    478. 

  478. 

  479. 	poppic	ebx			; restore GOT address
    480. 

  480. 

  481. 	add	esi, byte 4*SIZEOF_JCOEF	; wsptr
    482. 

  482. 	add	edi, byte 4*SIZEOF_JSAMPROW
    483. 

  483. 	dec	ecx				; ctr
    484. 

  484. 	jnz	near .rowloop
    485. 

  485. 

  486. 	emms		; empty MMX state
    487. 

  487. 

  488. 	pop	edi
    489. 

  489. 	pop	esi
    490. 

  490. ;	pop	edx		; need not be preserved
    491. 

  491. ;	pop	ecx		; need not be preserved
    492. 

  492. 	pop	ebx
    493. 

  493. 	mov	esp,ebp		; esp <- aligned ebp
    494. 

  494. 	pop	esp		; esp <- original ebp
    495. 

  495. 	pop	ebp
    496. 

  496. 	ret
    497. 

  497. 

  498. ; For some reason, the OS X linker does not honor the request to align the
    499. 

  499. ; segment unless we do this.
    500. 

  500. 	align	16
    501.