2 ; jidctred.asm - reduced-size IDCT (64-bit SSE2)
4 ; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
5 ; Copyright (C) 2009, 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 ; This file contains inverse-DCT routines that produce reduced-size
19 ; output: either 4x4 or 2x2 pixels from an 8x8 DCT block.
20 ; The following code is based directly on the IJG's original jidctred.c;
21 ; see the jidctred.c for more details.
23 %include "jsimdext.inc"
26 ; --------------------------------------------------------------------------
31 %define DESCALE_P1_4 (CONST_BITS - PASS1_BITS + 1)
32 %define DESCALE_P2_4 (CONST_BITS + PASS1_BITS + 3 + 1)
33 %define DESCALE_P1_2 (CONST_BITS - PASS1_BITS + 2)
34 %define DESCALE_P2_2 (CONST_BITS + PASS1_BITS + 3 + 2)
37 F_0_211 equ 1730 ; FIX(0.211164243)
38 F_0_509 equ 4176 ; FIX(0.509795579)
39 F_0_601 equ 4926 ; FIX(0.601344887)
40 F_0_720 equ 5906 ; FIX(0.720959822)
41 F_0_765 equ 6270 ; FIX(0.765366865)
42 F_0_850 equ 6967 ; FIX(0.850430095)
43 F_0_899 equ 7373 ; FIX(0.899976223)
44 F_1_061 equ 8697 ; FIX(1.061594337)
45 F_1_272 equ 10426 ; FIX(1.272758580)
46 F_1_451 equ 11893 ; FIX(1.451774981)
47 F_1_847 equ 15137 ; FIX(1.847759065)
48 F_2_172 equ 17799 ; FIX(2.172734803)
49 F_2_562 equ 20995 ; FIX(2.562915447)
50 F_3_624 equ 29692 ; FIX(3.624509785)
52 ; NASM cannot do compile-time arithmetic on floating-point constants.
53 %define DESCALE(x, n) (((x) + (1 << ((n) - 1))) >> (n))
54 F_0_211 equ DESCALE( 226735879, 30 - CONST_BITS) ; FIX(0.211164243)
55 F_0_509 equ DESCALE( 547388834, 30 - CONST_BITS) ; FIX(0.509795579)
56 F_0_601 equ DESCALE( 645689155, 30 - CONST_BITS) ; FIX(0.601344887)
57 F_0_720 equ DESCALE( 774124714, 30 - CONST_BITS) ; FIX(0.720959822)
58 F_0_765 equ DESCALE( 821806413, 30 - CONST_BITS) ; FIX(0.765366865)
59 F_0_850 equ DESCALE( 913142361, 30 - CONST_BITS) ; FIX(0.850430095)
60 F_0_899 equ DESCALE( 966342111, 30 - CONST_BITS) ; FIX(0.899976223)
61 F_1_061 equ DESCALE(1139878239, 30 - CONST_BITS) ; FIX(1.061594337)
62 F_1_272 equ DESCALE(1366614119, 30 - CONST_BITS) ; FIX(1.272758580)
63 F_1_451 equ DESCALE(1558831516, 30 - CONST_BITS) ; FIX(1.451774981)
64 F_1_847 equ DESCALE(1984016188, 30 - CONST_BITS) ; FIX(1.847759065)
65 F_2_172 equ DESCALE(2332956230, 30 - CONST_BITS) ; FIX(2.172734803)
66 F_2_562 equ DESCALE(2751909506, 30 - CONST_BITS) ; FIX(2.562915447)
67 F_3_624 equ DESCALE(3891787747, 30 - CONST_BITS) ; FIX(3.624509785)
70 ; --------------------------------------------------------------------------
74 GLOBAL_DATA(jconst_idct_red_sse2)
76 EXTN(jconst_idct_red_sse2):
78 PW_F184_MF076 times 4 dw F_1_847, -F_0_765
79 PW_F256_F089 times 4 dw F_2_562, F_0_899
80 PW_F106_MF217 times 4 dw F_1_061, -F_2_172
81 PW_MF060_MF050 times 4 dw -F_0_601, -F_0_509
82 PW_F145_MF021 times 4 dw F_1_451, -F_0_211
83 PW_F362_MF127 times 4 dw F_3_624, -F_1_272
84 PW_F085_MF072 times 4 dw F_0_850, -F_0_720
85 PD_DESCALE_P1_4 times 4 dd 1 << (DESCALE_P1_4 - 1)
86 PD_DESCALE_P2_4 times 4 dd 1 << (DESCALE_P2_4 - 1)
87 PD_DESCALE_P1_2 times 4 dd 1 << (DESCALE_P1_2 - 1)
88 PD_DESCALE_P2_2 times 4 dd 1 << (DESCALE_P2_2 - 1)
89 PB_CENTERJSAMP times 16 db CENTERJSAMPLE
93 ; --------------------------------------------------------------------------
97 ; Perform dequantization and inverse DCT on one block of coefficients,
98 ; producing a reduced-size 4x4 output block.
101 ; jsimd_idct_4x4_sse2(void *dct_table, JCOEFPTR coef_block,
102 ; JSAMPARRAY output_buf, JDIMENSION output_col)
105 ; r10 = void *dct_table
106 ; r11 = JCOEFPTR coef_block
107 ; r12 = JSAMPARRAY output_buf
108 ; r13d = JDIMENSION output_col
110 %define original_rbp rbp + 0
111 %define wk(i) rbp - (WK_NUM - (i)) * SIZEOF_XMMWORD
116 GLOBAL_FUNCTION(jsimd_idct_4x4_sse2)
118 EXTN(jsimd_idct_4x4_sse2):
120 mov rax, rsp ; rax = original rbp
122 and rsp, byte (-SIZEOF_XMMWORD) ; align to 128 bits
124 mov rbp, rsp ; rbp = aligned rbp
128 ; ---- Pass 1: process columns from input.
130 mov rdx, r10 ; quantptr
133 %ifndef NO_ZERO_COLUMN_TEST_4X4_SSE2
134 mov eax, dword [DWBLOCK(1,0,rsi,SIZEOF_JCOEF)]
135 or eax, dword [DWBLOCK(2,0,rsi,SIZEOF_JCOEF)]
138 movdqa xmm0, XMMWORD [XMMBLOCK(1,0,rsi,SIZEOF_JCOEF)]
139 movdqa xmm1, XMMWORD [XMMBLOCK(2,0,rsi,SIZEOF_JCOEF)]
140 por xmm0, XMMWORD [XMMBLOCK(3,0,rsi,SIZEOF_JCOEF)]
141 por xmm1, XMMWORD [XMMBLOCK(5,0,rsi,SIZEOF_JCOEF)]
142 por xmm0, XMMWORD [XMMBLOCK(6,0,rsi,SIZEOF_JCOEF)]
143 por xmm1, XMMWORD [XMMBLOCK(7,0,rsi,SIZEOF_JCOEF)]
151 ; -- AC terms all zero
153 movdqa xmm0, XMMWORD [XMMBLOCK(0,0,rsi,SIZEOF_JCOEF)]
154 pmullw xmm0, XMMWORD [XMMBLOCK(0,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
156 psllw xmm0, PASS1_BITS
158 movdqa xmm3, xmm0 ; xmm0=in0=(00 01 02 03 04 05 06 07)
159 punpcklwd xmm0, xmm0 ; xmm0=(00 00 01 01 02 02 03 03)
160 punpckhwd xmm3, xmm3 ; xmm3=(04 04 05 05 06 06 07 07)
162 pshufd xmm1, xmm0, 0x50 ; xmm1=[col0 col1]=(00 00 00 00 01 01 01 01)
163 pshufd xmm0, xmm0, 0xFA ; xmm0=[col2 col3]=(02 02 02 02 03 03 03 03)
164 pshufd xmm6, xmm3, 0x50 ; xmm6=[col4 col5]=(04 04 04 04 05 05 05 05)
165 pshufd xmm3, xmm3, 0xFA ; xmm3=[col6 col7]=(06 06 06 06 07 07 07 07)
173 movdqa xmm0, XMMWORD [XMMBLOCK(1,0,rsi,SIZEOF_JCOEF)]
174 movdqa xmm1, XMMWORD [XMMBLOCK(3,0,rsi,SIZEOF_JCOEF)]
175 pmullw xmm0, XMMWORD [XMMBLOCK(1,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
176 pmullw xmm1, XMMWORD [XMMBLOCK(3,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
177 movdqa xmm2, XMMWORD [XMMBLOCK(5,0,rsi,SIZEOF_JCOEF)]
178 movdqa xmm3, XMMWORD [XMMBLOCK(7,0,rsi,SIZEOF_JCOEF)]
179 pmullw xmm2, XMMWORD [XMMBLOCK(5,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
180 pmullw xmm3, XMMWORD [XMMBLOCK(7,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
188 pmaddwd xmm4, [rel PW_F256_F089] ; xmm4=(tmp2L)
189 pmaddwd xmm5, [rel PW_F256_F089] ; xmm5=(tmp2H)
190 pmaddwd xmm0, [rel PW_F106_MF217] ; xmm0=(tmp0L)
191 pmaddwd xmm1, [rel PW_F106_MF217] ; xmm1=(tmp0H)
199 pmaddwd xmm6, [rel PW_MF060_MF050] ; xmm6=(tmp2L)
200 pmaddwd xmm7, [rel PW_MF060_MF050] ; xmm7=(tmp2H)
201 pmaddwd xmm2, [rel PW_F145_MF021] ; xmm2=(tmp0L)
202 pmaddwd xmm3, [rel PW_F145_MF021] ; xmm3=(tmp0H)
204 paddd xmm6, xmm4 ; xmm6=tmp2L
205 paddd xmm7, xmm5 ; xmm7=tmp2H
206 paddd xmm2, xmm0 ; xmm2=tmp0L
207 paddd xmm3, xmm1 ; xmm3=tmp0H
209 movdqa XMMWORD [wk(0)], xmm2 ; wk(0)=tmp0L
210 movdqa XMMWORD [wk(1)], xmm3 ; wk(1)=tmp0H
214 movdqa xmm4, XMMWORD [XMMBLOCK(0,0,rsi,SIZEOF_JCOEF)]
215 movdqa xmm5, XMMWORD [XMMBLOCK(2,0,rsi,SIZEOF_JCOEF)]
216 movdqa xmm0, XMMWORD [XMMBLOCK(6,0,rsi,SIZEOF_JCOEF)]
217 pmullw xmm4, XMMWORD [XMMBLOCK(0,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
218 pmullw xmm5, XMMWORD [XMMBLOCK(2,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
219 pmullw xmm0, XMMWORD [XMMBLOCK(6,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
223 punpcklwd xmm1, xmm4 ; xmm1=tmp0L
224 punpckhwd xmm2, xmm4 ; xmm2=tmp0H
225 psrad xmm1, (16-CONST_BITS-1) ; psrad xmm1,16 & pslld xmm1,CONST_BITS+1
226 psrad xmm2, (16-CONST_BITS-1) ; psrad xmm2,16 & pslld xmm2,CONST_BITS+1
228 movdqa xmm3, xmm5 ; xmm5=in2=z2
229 punpcklwd xmm5, xmm0 ; xmm0=in6=z3
231 pmaddwd xmm5, [rel PW_F184_MF076] ; xmm5=tmp2L
232 pmaddwd xmm3, [rel PW_F184_MF076] ; xmm3=tmp2H
236 paddd xmm1, xmm5 ; xmm1=tmp10L
237 paddd xmm2, xmm3 ; xmm2=tmp10H
238 psubd xmm4, xmm5 ; xmm4=tmp12L
239 psubd xmm0, xmm3 ; xmm0=tmp12H
241 ; -- Final output stage
245 paddd xmm1, xmm6 ; xmm1=data0L
246 paddd xmm2, xmm7 ; xmm2=data0H
247 psubd xmm5, xmm6 ; xmm5=data3L
248 psubd xmm3, xmm7 ; xmm3=data3H
250 movdqa xmm6, [rel PD_DESCALE_P1_4] ; xmm6=[rel PD_DESCALE_P1_4]
254 psrad xmm1, DESCALE_P1_4
255 psrad xmm2, DESCALE_P1_4
258 psrad xmm5, DESCALE_P1_4
259 psrad xmm3, DESCALE_P1_4
261 packssdw xmm1, xmm2 ; xmm1=data0=(00 01 02 03 04 05 06 07)
262 packssdw xmm5, xmm3 ; xmm5=data3=(30 31 32 33 34 35 36 37)
264 movdqa xmm7, XMMWORD [wk(0)] ; xmm7=tmp0L
265 movdqa xmm6, XMMWORD [wk(1)] ; xmm6=tmp0H
269 paddd xmm4, xmm7 ; xmm4=data1L
270 paddd xmm0, xmm6 ; xmm0=data1H
271 psubd xmm2, xmm7 ; xmm2=data2L
272 psubd xmm3, xmm6 ; xmm3=data2H
274 movdqa xmm7, [rel PD_DESCALE_P1_4] ; xmm7=[rel PD_DESCALE_P1_4]
278 psrad xmm4, DESCALE_P1_4
279 psrad xmm0, DESCALE_P1_4
282 psrad xmm2, DESCALE_P1_4
283 psrad xmm3, DESCALE_P1_4
285 packssdw xmm4, xmm0 ; xmm4=data1=(10 11 12 13 14 15 16 17)
286 packssdw xmm2, xmm3 ; xmm2=data2=(20 21 22 23 24 25 26 27)
288 movdqa xmm6, xmm1 ; transpose coefficients(phase 1)
289 punpcklwd xmm1, xmm4 ; xmm1=(00 10 01 11 02 12 03 13)
290 punpckhwd xmm6, xmm4 ; xmm6=(04 14 05 15 06 16 07 17)
291 movdqa xmm7, xmm2 ; transpose coefficients(phase 1)
292 punpcklwd xmm2, xmm5 ; xmm2=(20 30 21 31 22 32 23 33)
293 punpckhwd xmm7, xmm5 ; xmm7=(24 34 25 35 26 36 27 37)
295 movdqa xmm0, xmm1 ; transpose coefficients(phase 2)
296 punpckldq xmm1, xmm2 ; xmm1=[col0 col1]=(00 10 20 30 01 11 21 31)
297 punpckhdq xmm0, xmm2 ; xmm0=[col2 col3]=(02 12 22 32 03 13 23 33)
298 movdqa xmm3, xmm6 ; transpose coefficients(phase 2)
299 punpckldq xmm6, xmm7 ; xmm6=[col4 col5]=(04 14 24 34 05 15 25 35)
300 punpckhdq xmm3, xmm7 ; xmm3=[col6 col7]=(06 16 26 36 07 17 27 37)
303 ; -- Prefetch the next coefficient block
305 prefetchnta [rsi + DCTSIZE2*SIZEOF_JCOEF + 0*32]
306 prefetchnta [rsi + DCTSIZE2*SIZEOF_JCOEF + 1*32]
307 prefetchnta [rsi + DCTSIZE2*SIZEOF_JCOEF + 2*32]
308 prefetchnta [rsi + DCTSIZE2*SIZEOF_JCOEF + 3*32]
310 ; ---- Pass 2: process rows, store into output array.
312 mov rax, [original_rbp]
313 mov rdi, r12 ; (JSAMPROW *)
319 punpcklwd xmm4, xmm1 ; xmm4=tmp0
320 psrad xmm4, (16-CONST_BITS-1) ; psrad xmm4,16 & pslld xmm4,CONST_BITS+1
328 pmaddwd xmm1, [rel PW_F256_F089] ; xmm1=(tmp2)
329 pmaddwd xmm6, [rel PW_MF060_MF050] ; xmm6=(tmp2)
330 pmaddwd xmm5, [rel PW_F106_MF217] ; xmm5=(tmp0)
331 pmaddwd xmm2, [rel PW_F145_MF021] ; xmm2=(tmp0)
333 paddd xmm6, xmm1 ; xmm6=tmp2
334 paddd xmm2, xmm5 ; xmm2=tmp0
339 pmaddwd xmm0, [rel PW_F184_MF076] ; xmm0=tmp2
342 paddd xmm4, xmm0 ; xmm4=tmp10
343 psubd xmm7, xmm0 ; xmm7=tmp12
345 ; -- Final output stage
347 movdqa xmm1, [rel PD_DESCALE_P2_4] ; xmm1=[rel PD_DESCALE_P2_4]
351 paddd xmm4, xmm6 ; xmm4=data0=(00 10 20 30)
352 paddd xmm7, xmm2 ; xmm7=data1=(01 11 21 31)
353 psubd xmm5, xmm6 ; xmm5=data3=(03 13 23 33)
354 psubd xmm3, xmm2 ; xmm3=data2=(02 12 22 32)
358 psrad xmm4, DESCALE_P2_4
359 psrad xmm7, DESCALE_P2_4
362 psrad xmm5, DESCALE_P2_4
363 psrad xmm3, DESCALE_P2_4
365 packssdw xmm4, xmm3 ; xmm4=(00 10 20 30 02 12 22 32)
366 packssdw xmm7, xmm5 ; xmm7=(01 11 21 31 03 13 23 33)
368 movdqa xmm0, xmm4 ; transpose coefficients(phase 1)
369 punpcklwd xmm4, xmm7 ; xmm4=(00 01 10 11 20 21 30 31)
370 punpckhwd xmm0, xmm7 ; xmm0=(02 03 12 13 22 23 32 33)
372 movdqa xmm6, xmm4 ; transpose coefficients(phase 2)
373 punpckldq xmm4, xmm0 ; xmm4=(00 01 02 03 10 11 12 13)
374 punpckhdq xmm6, xmm0 ; xmm6=(20 21 22 23 30 31 32 33)
376 packsswb xmm4, xmm6 ; xmm4=(00 01 02 03 10 11 12 13 20 ..)
377 paddb xmm4, [rel PB_CENTERJSAMP]
379 pshufd xmm2, xmm4, 0x39 ; xmm2=(10 11 12 13 20 21 22 23 30 ..)
380 pshufd xmm1, xmm4, 0x4E ; xmm1=(20 21 22 23 30 31 32 33 00 ..)
381 pshufd xmm3, xmm4, 0x93 ; xmm3=(30 31 32 33 00 01 02 03 10 ..)
383 mov rdxp, JSAMPROW [rdi+0*SIZEOF_JSAMPROW]
384 mov rsip, JSAMPROW [rdi+1*SIZEOF_JSAMPROW]
385 movd XMM_DWORD [rdx+rax*SIZEOF_JSAMPLE], xmm4
386 movd XMM_DWORD [rsi+rax*SIZEOF_JSAMPLE], xmm2
387 mov rdxp, JSAMPROW [rdi+2*SIZEOF_JSAMPROW]
388 mov rsip, JSAMPROW [rdi+3*SIZEOF_JSAMPROW]
389 movd XMM_DWORD [rdx+rax*SIZEOF_JSAMPLE], xmm1
390 movd XMM_DWORD [rsi+rax*SIZEOF_JSAMPLE], xmm3
393 mov rsp, rbp ; rsp <- aligned rbp
394 pop rsp ; rsp <- original rbp
398 ; --------------------------------------------------------------------------
400 ; Perform dequantization and inverse DCT on one block of coefficients,
401 ; producing a reduced-size 2x2 output block.
404 ; jsimd_idct_2x2_sse2(void *dct_table, JCOEFPTR coef_block,
405 ; JSAMPARRAY output_buf, JDIMENSION output_col)
408 ; r10 = void *dct_table
409 ; r11 = JCOEFPTR coef_block
410 ; r12 = JSAMPARRAY output_buf
411 ; r13d = JDIMENSION output_col
414 GLOBAL_FUNCTION(jsimd_idct_2x2_sse2)
416 EXTN(jsimd_idct_2x2_sse2):
423 ; ---- Pass 1: process columns from input.
425 mov rdx, r10 ; quantptr
428 ; | input: | result: |
429 ; | 00 01 ** 03 ** 05 ** 07 | |
430 ; | 10 11 ** 13 ** 15 ** 17 | |
431 ; | ** ** ** ** ** ** ** ** | |
432 ; | 30 31 ** 33 ** 35 ** 37 | A0 A1 A3 A5 A7 |
433 ; | ** ** ** ** ** ** ** ** | B0 B1 B3 B5 B7 |
434 ; | 50 51 ** 53 ** 55 ** 57 | |
435 ; | ** ** ** ** ** ** ** ** | |
436 ; | 70 71 ** 73 ** 75 ** 77 | |
440 movdqa xmm0, XMMWORD [XMMBLOCK(1,0,rsi,SIZEOF_JCOEF)]
441 movdqa xmm1, XMMWORD [XMMBLOCK(3,0,rsi,SIZEOF_JCOEF)]
442 pmullw xmm0, XMMWORD [XMMBLOCK(1,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
443 pmullw xmm1, XMMWORD [XMMBLOCK(3,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
444 movdqa xmm2, XMMWORD [XMMBLOCK(5,0,rsi,SIZEOF_JCOEF)]
445 movdqa xmm3, XMMWORD [XMMBLOCK(7,0,rsi,SIZEOF_JCOEF)]
446 pmullw xmm2, XMMWORD [XMMBLOCK(5,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
447 pmullw xmm3, XMMWORD [XMMBLOCK(7,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
449 ; xmm0=(10 11 ** 13 ** 15 ** 17), xmm1=(30 31 ** 33 ** 35 ** 37)
450 ; xmm2=(50 51 ** 53 ** 55 ** 57), xmm3=(70 71 ** 73 ** 75 ** 77)
453 pslld xmm7, WORD_BIT ; xmm7={0x0000 0xFFFF 0x0000 0xFFFF ..}
455 movdqa xmm4, xmm0 ; xmm4=(10 11 ** 13 ** 15 ** 17)
456 movdqa xmm5, xmm2 ; xmm5=(50 51 ** 53 ** 55 ** 57)
457 punpcklwd xmm4, xmm1 ; xmm4=(10 30 11 31 ** ** 13 33)
458 punpcklwd xmm5, xmm3 ; xmm5=(50 70 51 71 ** ** 53 73)
459 pmaddwd xmm4, [rel PW_F362_MF127]
460 pmaddwd xmm5, [rel PW_F085_MF072]
462 psrld xmm0, WORD_BIT ; xmm0=(11 -- 13 -- 15 -- 17 --)
463 pand xmm1, xmm7 ; xmm1=(-- 31 -- 33 -- 35 -- 37)
464 psrld xmm2, WORD_BIT ; xmm2=(51 -- 53 -- 55 -- 57 --)
465 pand xmm3, xmm7 ; xmm3=(-- 71 -- 73 -- 75 -- 77)
466 por xmm0, xmm1 ; xmm0=(11 31 13 33 15 35 17 37)
467 por xmm2, xmm3 ; xmm2=(51 71 53 73 55 75 57 77)
468 pmaddwd xmm0, [rel PW_F362_MF127]
469 pmaddwd xmm2, [rel PW_F085_MF072]
471 paddd xmm4, xmm5 ; xmm4=tmp0[col0 col1 **** col3]
472 paddd xmm0, xmm2 ; xmm0=tmp0[col1 col3 col5 col7]
476 movdqa xmm6, XMMWORD [XMMBLOCK(0,0,rsi,SIZEOF_JCOEF)]
477 pmullw xmm6, XMMWORD [XMMBLOCK(0,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
479 ; xmm6=(00 01 ** 03 ** 05 ** 07)
481 movdqa xmm1, xmm6 ; xmm1=(00 01 ** 03 ** 05 ** 07)
482 pslld xmm6, WORD_BIT ; xmm6=(-- 00 -- ** -- ** -- **)
483 pand xmm1, xmm7 ; xmm1=(-- 01 -- 03 -- 05 -- 07)
484 psrad xmm6, (WORD_BIT-CONST_BITS-2) ; xmm6=tmp10[col0 **** **** ****]
485 psrad xmm1, (WORD_BIT-CONST_BITS-2) ; xmm1=tmp10[col1 col3 col5 col7]
487 ; -- Final output stage
491 paddd xmm6, xmm4 ; xmm6=data0[col0 **** **** ****]=(A0 ** ** **)
492 paddd xmm1, xmm0 ; xmm1=data0[col1 col3 col5 col7]=(A1 A3 A5 A7)
493 psubd xmm3, xmm4 ; xmm3=data1[col0 **** **** ****]=(B0 ** ** **)
494 psubd xmm5, xmm0 ; xmm5=data1[col1 col3 col5 col7]=(B1 B3 B5 B7)
496 movdqa xmm2, [rel PD_DESCALE_P1_2] ; xmm2=[rel PD_DESCALE_P1_2]
498 punpckldq xmm6, xmm3 ; xmm6=(A0 B0 ** **)
501 punpcklqdq xmm1, xmm5 ; xmm1=(A1 A3 B1 B3)
502 punpckhqdq xmm7, xmm5 ; xmm7=(A5 A7 B5 B7)
505 psrad xmm6, DESCALE_P1_2
509 psrad xmm1, DESCALE_P1_2
510 psrad xmm7, DESCALE_P1_2
512 ; -- Prefetch the next coefficient block
514 prefetchnta [rsi + DCTSIZE2*SIZEOF_JCOEF + 0*32]
515 prefetchnta [rsi + DCTSIZE2*SIZEOF_JCOEF + 1*32]
516 prefetchnta [rsi + DCTSIZE2*SIZEOF_JCOEF + 2*32]
517 prefetchnta [rsi + DCTSIZE2*SIZEOF_JCOEF + 3*32]
519 ; ---- Pass 2: process rows, store into output array.
521 mov rdi, r12 ; (JSAMPROW *)
533 packssdw xmm1, xmm1 ; xmm1=(A1 A3 B1 B3 A1 A3 B1 B3)
534 packssdw xmm7, xmm7 ; xmm7=(A5 A7 B5 B7 A5 A7 B5 B7)
535 pmaddwd xmm1, [rel PW_F362_MF127]
536 pmaddwd xmm7, [rel PW_F085_MF072]
538 paddd xmm1, xmm7 ; xmm1=tmp0[row0 row1 row0 row1]
542 pslld xmm6, (CONST_BITS+2) ; xmm6=tmp10[row0 row1 **** ****]
544 ; -- Final output stage
547 paddd xmm6, xmm1 ; xmm6=data0[row0 row1 **** ****]=(C0 C1 ** **)
548 psubd xmm4, xmm1 ; xmm4=data1[row0 row1 **** ****]=(D0 D1 ** **)
550 punpckldq xmm6, xmm4 ; xmm6=(C0 D0 C1 D1)
552 paddd xmm6, [rel PD_DESCALE_P2_2]
553 psrad xmm6, DESCALE_P2_2
555 packssdw xmm6, xmm6 ; xmm6=(C0 D0 C1 D1 C0 D0 C1 D1)
556 packsswb xmm6, xmm6 ; xmm6=(C0 D0 C1 D1 C0 D0 C1 D1 ..)
557 paddb xmm6, [rel PB_CENTERJSAMP]
559 pextrw ebx, xmm6, 0x00 ; ebx=(C0 D0 -- --)
560 pextrw ecx, xmm6, 0x01 ; ecx=(C1 D1 -- --)
562 mov rdxp, JSAMPROW [rdi+0*SIZEOF_JSAMPROW]
563 mov rsip, JSAMPROW [rdi+1*SIZEOF_JSAMPROW]
564 mov word [rdx+rax*SIZEOF_JSAMPLE], bx
565 mov word [rsi+rax*SIZEOF_JSAMPLE], cx
572 ; For some reason, the OS X linker does not honor the request to align the
573 ; segment unless we do this.