simd/jimmxfst.asm - Issue 1953443002: Update to libjpeg_turbo 1.4.90

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Issue 1953443002: Update to libjpeg_turbo 1.4.90 (Closed) Base URL: https://chromium.googlesource.com/chromium/deps/libjpeg_turbo.git@master

Patch Set: Created 4 years, 7 months ago

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1 ;

2 ; jimmxfst.asm - fast integer IDCT (MMX)

3 ;

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

5 ;

6 ; Based on

7 ; x86 SIMD extension for IJG JPEG library

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

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

10 ;

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

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

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

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

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

16 ;

17 ; This file contains a fast, not so accurate integer implementation of

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

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

20 ; for more details.

21 ;

22 ; [TAB8]

23

24 %include "jsimdext.inc"

25 %include "jdct.inc"

26

27 ; --------------------------------------------------------------------------

28

29 %define CONST_BITS 8 ; 14 is also OK.

30 %define PASS1_BITS 2

31

32 %if IFAST_SCALE_BITS != PASS1_BITS

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

34 %endif

35

36 %if CONST_BITS == 8

37 F_1_082 equ 277 ; FIX(1.082392200)

38 F_1_414 equ 362 ; FIX(1.414213562)

39 F_1_847 equ 473 ; FIX(1.847759065)

40 F_2_613 equ 669 ; FIX(2.613125930)

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

42 %else

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

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

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

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

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

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

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

50 %endif

51

52 ; --------------------------------------------------------------------------

53 SECTION SEG_CONST

54

55 ; PRE_MULTIPLY_SCALE_BITS <= 2 (to avoid overflow)

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

57

58 %define PRE_MULTIPLY_SCALE_BITS 2

59 %define CONST_SHIFT (16 - PRE_MULTIPLY_SCALE_BITS - CONST_BITS)

60

61 alignz 16

62 global EXTN(jconst_idct_ifast_mmx) PRIVATE

63

64 EXTN(jconst_idct_ifast_mmx):

65

66 PW_F1414 times 4 dw F_1_414 << CONST_SHIFT

67 PW_F1847 times 4 dw F_1_847 << CONST_SHIFT

68 PW_MF1613 times 4 dw -F_1_613 << CONST_SHIFT

69 PW_F1082 times 4 dw F_1_082 << CONST_SHIFT

70 PB_CENTERJSAMP times 8 db CENTERJSAMPLE

71

72 alignz 16

73

74 ; --------------------------------------------------------------------------

75 SECTION SEG_TEXT

76 BITS 32

77 ;

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

79 ;

80 ; GLOBAL(void)

81 ; jsimd_idct_ifast_mmx (void * dct_table, JCOEFPTR coef_block,

82 ; JSAMPARRAY output_buf, JDIMENSION output_col)

83 ;

84

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

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

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

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

89

90 %define original_ebp ebp+0

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

92 %define WK_NUM 2

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

94 ; JCOEF workspace[DCTSIZE2]

95

96 align 16

97 global EXTN(jsimd_idct_ifast_mmx) PRIVATE

98

99 EXTN(jsimd_idct_ifast_mmx):

100 push ebp

101 mov eax,esp ; eax = original ebp

102 sub esp, byte 4

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

104 mov [esp],eax

105 mov ebp,esp ; ebp = aligned ebp

106 lea esp, [workspace]

107 push ebx

108 ; push ecx ; need not be preserved

109 ; push edx ; need not be preserved

110 push esi

111 push edi

112

113 get_GOT ebx ; get GOT address

114

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

116

117 ; mov eax, [original_ebp]

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

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

120 lea edi, [workspace] ; JCOEF * wsptr

121 mov ecx, DCTSIZE/4 ; ctr

122 alignx 16,7

123 .columnloop:

124 %ifndef NO_ZERO_COLUMN_TEST_IFAST_MMX

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

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

127 jnz short .columnDCT

128

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

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

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

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

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

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

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

136 por mm1,mm0

137 packsswb mm1,mm1

138 movd eax,mm1

139 test eax,eax

140 jnz short .columnDCT

141

142 ; -- AC terms all zero

143

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

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

146

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

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

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

150

151 movq mm1,mm0

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

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

154 movq mm3,mm2

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

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

157

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

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

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

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

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

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

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

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

166 jmp near .nextcolumn

167 alignx 16,7

168 %endif

169 .columnDCT:

170

171 ; -- Even part

172

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

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

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

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

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

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

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

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

181

182 movq mm4,mm0

183 movq mm5,mm1

184 psubw mm0,mm2 ; mm0=tmp11

185 psubw mm1,mm3

186 paddw mm4,mm2 ; mm4=tmp10

187 paddw mm5,mm3 ; mm5=tmp13

188

189 psllw mm1,PRE_MULTIPLY_SCALE_BITS

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

191 psubw mm1,mm5 ; mm1=tmp12

192

193 movq mm6,mm4

194 movq mm7,mm0

195 psubw mm4,mm5 ; mm4=tmp3

196 psubw mm0,mm1 ; mm0=tmp2

197 paddw mm6,mm5 ; mm6=tmp0

198 paddw mm7,mm1 ; mm7=tmp1

199

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

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

202

203 ; -- Odd part

204

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

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

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

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

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

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

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

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

213

214 movq mm4,mm2

215 movq mm0,mm5

216 psubw mm2,mm1 ; mm2=z12

217 psubw mm5,mm3 ; mm5=z10

218 paddw mm4,mm1 ; mm4=z11

219 paddw mm0,mm3 ; mm0=z13

220

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

222 psllw mm2,PRE_MULTIPLY_SCALE_BITS

223 psllw mm5,PRE_MULTIPLY_SCALE_BITS

224

225 movq mm3,mm4

226 psubw mm4,mm0

227 paddw mm3,mm0 ; mm3=tmp7

228

229 psllw mm4,PRE_MULTIPLY_SCALE_BITS

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

231

232 ; To avoid overflow...

233 ;

234 ; (Original)

235 ; tmp12 = -2.613125930 * z10 + z5;

236 ;

237 ; (This implementation)

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

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

240

241 movq mm0,mm5

242 paddw mm5,mm2

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

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

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

246 psubw mm0,mm1

247 psubw mm2,mm5 ; mm2=tmp10

248 paddw mm0,mm5 ; mm0=tmp12

249

250 ; -- Final output stage

251

252 psubw mm0,mm3 ; mm0=tmp6

253 movq mm1,mm6

254 movq mm5,mm7

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

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

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

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

259 psubw mm4,mm0 ; mm4=tmp5

260

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

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

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

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

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

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

267

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

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

270

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

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

273

274 paddw mm2,mm4 ; mm2=tmp4

275 movq mm5,mm7

276 movq mm0,mm1

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

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

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

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

281

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

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

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

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

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

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

288

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

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

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

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

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

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

295

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

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

298

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

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

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

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

303

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

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

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

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

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

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

310

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

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

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

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

315

316 .nextcolumn:

317 add esi, byte 4*SIZEOF_JCOEF ; coef_block

318 add edx, byte 4*SIZEOF_IFAST_MULT_TYPE ; quantptr

319 add edi, byte 4DCTSIZESIZEOF_JCOEF ; wsptr

320 dec ecx ; ctr

321 jnz near .columnloop

322

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

324

325 mov eax, [original_ebp]

326 lea esi, [workspace] ; JCOEF * wsptr

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

328 mov eax, JDIMENSION [output_col(eax)]

329 mov ecx, DCTSIZE/4 ; ctr

330 alignx 16,7

331 .rowloop:

332

333 ; -- Even part

334

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

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

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

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

339

340 movq mm4,mm0

341 movq mm5,mm1

342 psubw mm0,mm2 ; mm0=tmp11

343 psubw mm1,mm3

344 paddw mm4,mm2 ; mm4=tmp10

345 paddw mm5,mm3 ; mm5=tmp13

346

347 psllw mm1,PRE_MULTIPLY_SCALE_BITS

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

349 psubw mm1,mm5 ; mm1=tmp12

350

351 movq mm6,mm4

352 movq mm7,mm0

353 psubw mm4,mm5 ; mm4=tmp3

354 psubw mm0,mm1 ; mm0=tmp2

355 paddw mm6,mm5 ; mm6=tmp0

356 paddw mm7,mm1 ; mm7=tmp1

357

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

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

360

361 ; -- Odd part

362

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

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

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

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

367

368 movq mm4,mm2

369 movq mm0,mm5

370 psubw mm2,mm1 ; mm2=z12

371 psubw mm5,mm3 ; mm5=z10

372 paddw mm4,mm1 ; mm4=z11

373 paddw mm0,mm3 ; mm0=z13

374

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

376 psllw mm2,PRE_MULTIPLY_SCALE_BITS

377 psllw mm5,PRE_MULTIPLY_SCALE_BITS

378

379 movq mm3,mm4

380 psubw mm4,mm0

381 paddw mm3,mm0 ; mm3=tmp7

382

383 psllw mm4,PRE_MULTIPLY_SCALE_BITS

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

385

386 ; To avoid overflow...

387 ;

388 ; (Original)

389 ; tmp12 = -2.613125930 * z10 + z5;

390 ;

391 ; (This implementation)

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

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

394

395 movq mm0,mm5

396 paddw mm5,mm2

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

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

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

400 psubw mm0,mm1

401 psubw mm2,mm5 ; mm2=tmp10

402 paddw mm0,mm5 ; mm0=tmp12

403

404 ; -- Final output stage

405

406 psubw mm0,mm3 ; mm0=tmp6

407 movq mm1,mm6

408 movq mm5,mm7

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

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

411 psraw mm6,(PASS1_BITS+3) ; descale

412 psraw mm7,(PASS1_BITS+3) ; descale

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

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

415 psraw mm1,(PASS1_BITS+3) ; descale

416 psraw mm5,(PASS1_BITS+3) ; descale

417 psubw mm4,mm0 ; mm4=tmp5

418

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

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

421

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

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

424

425 paddw mm2,mm4 ; mm2=tmp4

426 movq mm5,mm3

427 movq mm1,mm0

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

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

430 psraw mm3,(PASS1_BITS+3) ; descale

431 psraw mm0,(PASS1_BITS+3) ; descale

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

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

434 psraw mm5,(PASS1_BITS+3) ; descale

435 psraw mm1,(PASS1_BITS+3) ; descale

436

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

438

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

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

441

442 paddb mm6,mm4

443 paddb mm7,mm4

444 paddb mm3,mm4

445 paddb mm1,mm4

446

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

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

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

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

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

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

453

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

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

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

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

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

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

460

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

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

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

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

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

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

467

468 pushpic ebx ; save GOT address

469

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

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

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

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

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

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

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

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

478

479 poppic ebx ; restore GOT address

480

481 add esi, byte 4*SIZEOF_JCOEF ; wsptr

482 add edi, byte 4*SIZEOF_JSAMPROW

483 dec ecx ; ctr

484 jnz near .rowloop

485

486 emms ; empty MMX state

487

488 pop edi

489 pop esi

490 ; pop edx ; need not be preserved

491 ; pop ecx ; need not be preserved

492 pop ebx

493 mov esp,ebp ; esp <- aligned ebp

494 pop esp ; esp <- original ebp

495 pop ebp

496 ret

497

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

499 ; segment unless we do this.

500 align 16

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