1;
2; jidctint.asm - accurate integer IDCT (64-bit SSE2)
3;
4; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
5; Copyright (C) 2009, D. R. Commander.
6;
7; Based on the 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 slow-but-accurate integer implementation of the
18; inverse DCT (Discrete Cosine Transform). The following code is based
19; directly on the IJG's original jidctint.c; see the jidctint.c for
20; more details.
21;
22; [TAB8]
23
24%include "jsimdext.inc"
25%include "jdct.inc"
26
27; --------------------------------------------------------------------------
28
29%define CONST_BITS      13
30%define PASS1_BITS      2
31
32%define DESCALE_P1      (CONST_BITS-PASS1_BITS)
33%define DESCALE_P2      (CONST_BITS+PASS1_BITS+3)
34
35%if CONST_BITS == 13
36F_0_298 equ      2446           ; FIX(0.298631336)
37F_0_390 equ      3196           ; FIX(0.390180644)
38F_0_541 equ      4433           ; FIX(0.541196100)
39F_0_765 equ      6270           ; FIX(0.765366865)
40F_0_899 equ      7373           ; FIX(0.899976223)
41F_1_175 equ      9633           ; FIX(1.175875602)
42F_1_501 equ     12299           ; FIX(1.501321110)
43F_1_847 equ     15137           ; FIX(1.847759065)
44F_1_961 equ     16069           ; FIX(1.961570560)
45F_2_053 equ     16819           ; FIX(2.053119869)
46F_2_562 equ     20995           ; FIX(2.562915447)
47F_3_072 equ     25172           ; FIX(3.072711026)
48%else
49; NASM cannot do compile-time arithmetic on floating-point constants.
50%define DESCALE(x,n)  (((x)+(1<<((n)-1)))>>(n))
51F_0_298 equ     DESCALE( 320652955,30-CONST_BITS)       ; FIX(0.298631336)
52F_0_390 equ     DESCALE( 418953276,30-CONST_BITS)       ; FIX(0.390180644)
53F_0_541 equ     DESCALE( 581104887,30-CONST_BITS)       ; FIX(0.541196100)
54F_0_765 equ     DESCALE( 821806413,30-CONST_BITS)       ; FIX(0.765366865)
55F_0_899 equ     DESCALE( 966342111,30-CONST_BITS)       ; FIX(0.899976223)
56F_1_175 equ     DESCALE(1262586813,30-CONST_BITS)       ; FIX(1.175875602)
57F_1_501 equ     DESCALE(1612031267,30-CONST_BITS)       ; FIX(1.501321110)
58F_1_847 equ     DESCALE(1984016188,30-CONST_BITS)       ; FIX(1.847759065)
59F_1_961 equ     DESCALE(2106220350,30-CONST_BITS)       ; FIX(1.961570560)
60F_2_053 equ     DESCALE(2204520673,30-CONST_BITS)       ; FIX(2.053119869)
61F_2_562 equ     DESCALE(2751909506,30-CONST_BITS)       ; FIX(2.562915447)
62F_3_072 equ     DESCALE(3299298341,30-CONST_BITS)       ; FIX(3.072711026)
63%endif
64
65; --------------------------------------------------------------------------
66        SECTION SEG_CONST
67
68        alignz  16
69        global  EXTN(jconst_idct_islow_sse2)
70
71EXTN(jconst_idct_islow_sse2):
72
73PW_F130_F054    times 4 dw  (F_0_541+F_0_765), F_0_541
74PW_F054_MF130   times 4 dw  F_0_541, (F_0_541-F_1_847)
75PW_MF078_F117   times 4 dw  (F_1_175-F_1_961), F_1_175
76PW_F117_F078    times 4 dw  F_1_175, (F_1_175-F_0_390)
77PW_MF060_MF089  times 4 dw  (F_0_298-F_0_899),-F_0_899
78PW_MF089_F060   times 4 dw -F_0_899, (F_1_501-F_0_899)
79PW_MF050_MF256  times 4 dw  (F_2_053-F_2_562),-F_2_562
80PW_MF256_F050   times 4 dw -F_2_562, (F_3_072-F_2_562)
81PD_DESCALE_P1   times 4 dd  1 << (DESCALE_P1-1)
82PD_DESCALE_P2   times 4 dd  1 << (DESCALE_P2-1)
83PB_CENTERJSAMP  times 16 db CENTERJSAMPLE
84
85        alignz  16
86
87; --------------------------------------------------------------------------
88        SECTION SEG_TEXT
89        BITS    64
90;
91; Perform dequantization and inverse DCT on one block of coefficients.
92;
93; GLOBAL(void)
94; jsimd_idct_islow_sse2 (void *dct_table, JCOEFPTR coef_block,
95;                        JSAMPARRAY output_buf, JDIMENSION output_col)
96;
97
98; r10 = jpeg_component_info *compptr
99; r11 = JCOEFPTR coef_block
100; r12 = JSAMPARRAY output_buf
101; r13 = JDIMENSION output_col
102
103%define original_rbp    rbp+0
104%define wk(i)           rbp-(WK_NUM-(i))*SIZEOF_XMMWORD ; xmmword wk[WK_NUM]
105%define WK_NUM          12
106
107        align   16
108        global  EXTN(jsimd_idct_islow_sse2)
109
110EXTN(jsimd_idct_islow_sse2):
111        push    rbp
112        mov     rax,rsp                         ; rax = original rbp
113        sub     rsp, byte 4
114        and     rsp, byte (-SIZEOF_XMMWORD)     ; align to 128 bits
115        mov     [rsp],rax
116        mov     rbp,rsp                         ; rbp = aligned rbp
117        lea     rsp, [wk(0)]
118        collect_args
119
120        ; ---- Pass 1: process columns from input.
121
122        mov     rdx, r10                ; quantptr
123        mov     rsi, r11                ; inptr
124
125%ifndef NO_ZERO_COLUMN_TEST_ISLOW_SSE2
126        mov     eax, DWORD [DWBLOCK(1,0,rsi,SIZEOF_JCOEF)]
127        or      eax, DWORD [DWBLOCK(2,0,rsi,SIZEOF_JCOEF)]
128        jnz     near .columnDCT
129
130        movdqa  xmm0, XMMWORD [XMMBLOCK(1,0,rsi,SIZEOF_JCOEF)]
131        movdqa  xmm1, XMMWORD [XMMBLOCK(2,0,rsi,SIZEOF_JCOEF)]
132        por     xmm0, XMMWORD [XMMBLOCK(3,0,rsi,SIZEOF_JCOEF)]
133        por     xmm1, XMMWORD [XMMBLOCK(4,0,rsi,SIZEOF_JCOEF)]
134        por     xmm0, XMMWORD [XMMBLOCK(5,0,rsi,SIZEOF_JCOEF)]
135        por     xmm1, XMMWORD [XMMBLOCK(6,0,rsi,SIZEOF_JCOEF)]
136        por     xmm0, XMMWORD [XMMBLOCK(7,0,rsi,SIZEOF_JCOEF)]
137        por     xmm1,xmm0
138        packsswb xmm1,xmm1
139        packsswb xmm1,xmm1
140        movd    eax,xmm1
141        test    rax,rax
142        jnz     short .columnDCT
143
144        ; -- AC terms all zero
145
146        movdqa  xmm5, XMMWORD [XMMBLOCK(0,0,rsi,SIZEOF_JCOEF)]
147        pmullw  xmm5, XMMWORD [XMMBLOCK(0,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
148
149        psllw   xmm5,PASS1_BITS
150
151        movdqa    xmm4,xmm5             ; xmm5=in0=(00 01 02 03 04 05 06 07)
152        punpcklwd xmm5,xmm5             ; xmm5=(00 00 01 01 02 02 03 03)
153        punpckhwd xmm4,xmm4             ; xmm4=(04 04 05 05 06 06 07 07)
154
155        pshufd  xmm7,xmm5,0x00          ; xmm7=col0=(00 00 00 00 00 00 00 00)
156        pshufd  xmm6,xmm5,0x55          ; xmm6=col1=(01 01 01 01 01 01 01 01)
157        pshufd  xmm1,xmm5,0xAA          ; xmm1=col2=(02 02 02 02 02 02 02 02)
158        pshufd  xmm5,xmm5,0xFF          ; xmm5=col3=(03 03 03 03 03 03 03 03)
159        pshufd  xmm0,xmm4,0x00          ; xmm0=col4=(04 04 04 04 04 04 04 04)
160        pshufd  xmm3,xmm4,0x55          ; xmm3=col5=(05 05 05 05 05 05 05 05)
161        pshufd  xmm2,xmm4,0xAA          ; xmm2=col6=(06 06 06 06 06 06 06 06)
162        pshufd  xmm4,xmm4,0xFF          ; xmm4=col7=(07 07 07 07 07 07 07 07)
163
164        movdqa  XMMWORD [wk(8)], xmm6   ; wk(8)=col1
165        movdqa  XMMWORD [wk(9)], xmm5   ; wk(9)=col3
166        movdqa  XMMWORD [wk(10)], xmm3  ; wk(10)=col5
167        movdqa  XMMWORD [wk(11)], xmm4  ; wk(11)=col7
168        jmp     near .column_end
169%endif
170.columnDCT:
171
172        ; -- Even part
173
174        movdqa  xmm0, XMMWORD [XMMBLOCK(0,0,rsi,SIZEOF_JCOEF)]
175        movdqa  xmm1, XMMWORD [XMMBLOCK(2,0,rsi,SIZEOF_JCOEF)]
176        pmullw  xmm0, XMMWORD [XMMBLOCK(0,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
177        pmullw  xmm1, XMMWORD [XMMBLOCK(2,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
178        movdqa  xmm2, XMMWORD [XMMBLOCK(4,0,rsi,SIZEOF_JCOEF)]
179        movdqa  xmm3, XMMWORD [XMMBLOCK(6,0,rsi,SIZEOF_JCOEF)]
180        pmullw  xmm2, XMMWORD [XMMBLOCK(4,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
181        pmullw  xmm3, XMMWORD [XMMBLOCK(6,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
182
183        ; (Original)
184        ; z1 = (z2 + z3) * 0.541196100;
185        ; tmp2 = z1 + z3 * -1.847759065;
186        ; tmp3 = z1 + z2 * 0.765366865;
187        ;
188        ; (This implementation)
189        ; tmp2 = z2 * 0.541196100 + z3 * (0.541196100 - 1.847759065);
190        ; tmp3 = z2 * (0.541196100 + 0.765366865) + z3 * 0.541196100;
191
192        movdqa    xmm4,xmm1             ; xmm1=in2=z2
193        movdqa    xmm5,xmm1
194        punpcklwd xmm4,xmm3             ; xmm3=in6=z3
195        punpckhwd xmm5,xmm3
196        movdqa    xmm1,xmm4
197        movdqa    xmm3,xmm5
198        pmaddwd   xmm4,[rel PW_F130_F054]       ; xmm4=tmp3L
199        pmaddwd   xmm5,[rel PW_F130_F054]       ; xmm5=tmp3H
200        pmaddwd   xmm1,[rel PW_F054_MF130]      ; xmm1=tmp2L
201        pmaddwd   xmm3,[rel PW_F054_MF130]      ; xmm3=tmp2H
202
203        movdqa    xmm6,xmm0
204        paddw     xmm0,xmm2             ; xmm0=in0+in4
205        psubw     xmm6,xmm2             ; xmm6=in0-in4
206
207        pxor      xmm7,xmm7
208        pxor      xmm2,xmm2
209        punpcklwd xmm7,xmm0             ; xmm7=tmp0L
210        punpckhwd xmm2,xmm0             ; xmm2=tmp0H
211        psrad     xmm7,(16-CONST_BITS)  ; psrad xmm7,16 & pslld xmm7,CONST_BITS
212        psrad     xmm2,(16-CONST_BITS)  ; psrad xmm2,16 & pslld xmm2,CONST_BITS
213
214        movdqa  xmm0,xmm7
215        paddd   xmm7,xmm4               ; xmm7=tmp10L
216        psubd   xmm0,xmm4               ; xmm0=tmp13L
217        movdqa  xmm4,xmm2
218        paddd   xmm2,xmm5               ; xmm2=tmp10H
219        psubd   xmm4,xmm5               ; xmm4=tmp13H
220
221        movdqa  XMMWORD [wk(0)], xmm7   ; wk(0)=tmp10L
222        movdqa  XMMWORD [wk(1)], xmm2   ; wk(1)=tmp10H
223        movdqa  XMMWORD [wk(2)], xmm0   ; wk(2)=tmp13L
224        movdqa  XMMWORD [wk(3)], xmm4   ; wk(3)=tmp13H
225
226        pxor      xmm5,xmm5
227        pxor      xmm7,xmm7
228        punpcklwd xmm5,xmm6             ; xmm5=tmp1L
229        punpckhwd xmm7,xmm6             ; xmm7=tmp1H
230        psrad     xmm5,(16-CONST_BITS)  ; psrad xmm5,16 & pslld xmm5,CONST_BITS
231        psrad     xmm7,(16-CONST_BITS)  ; psrad xmm7,16 & pslld xmm7,CONST_BITS
232
233        movdqa  xmm2,xmm5
234        paddd   xmm5,xmm1               ; xmm5=tmp11L
235        psubd   xmm2,xmm1               ; xmm2=tmp12L
236        movdqa  xmm0,xmm7
237        paddd   xmm7,xmm3               ; xmm7=tmp11H
238        psubd   xmm0,xmm3               ; xmm0=tmp12H
239
240        movdqa  XMMWORD [wk(4)], xmm5   ; wk(4)=tmp11L
241        movdqa  XMMWORD [wk(5)], xmm7   ; wk(5)=tmp11H
242        movdqa  XMMWORD [wk(6)], xmm2   ; wk(6)=tmp12L
243        movdqa  XMMWORD [wk(7)], xmm0   ; wk(7)=tmp12H
244
245        ; -- Odd part
246
247        movdqa  xmm4, XMMWORD [XMMBLOCK(1,0,rsi,SIZEOF_JCOEF)]
248        movdqa  xmm6, XMMWORD [XMMBLOCK(3,0,rsi,SIZEOF_JCOEF)]
249        pmullw  xmm4, XMMWORD [XMMBLOCK(1,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
250        pmullw  xmm6, XMMWORD [XMMBLOCK(3,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
251        movdqa  xmm1, XMMWORD [XMMBLOCK(5,0,rsi,SIZEOF_JCOEF)]
252        movdqa  xmm3, XMMWORD [XMMBLOCK(7,0,rsi,SIZEOF_JCOEF)]
253        pmullw  xmm1, XMMWORD [XMMBLOCK(5,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
254        pmullw  xmm3, XMMWORD [XMMBLOCK(7,0,rdx,SIZEOF_ISLOW_MULT_TYPE)]
255
256        movdqa  xmm5,xmm6
257        movdqa  xmm7,xmm4
258        paddw   xmm5,xmm3               ; xmm5=z3
259        paddw   xmm7,xmm1               ; xmm7=z4
260
261        ; (Original)
262        ; z5 = (z3 + z4) * 1.175875602;
263        ; z3 = z3 * -1.961570560;  z4 = z4 * -0.390180644;
264        ; z3 += z5;  z4 += z5;
265        ;
266        ; (This implementation)
267        ; z3 = z3 * (1.175875602 - 1.961570560) + z4 * 1.175875602;
268        ; z4 = z3 * 1.175875602 + z4 * (1.175875602 - 0.390180644);
269
270        movdqa    xmm2,xmm5
271        movdqa    xmm0,xmm5
272        punpcklwd xmm2,xmm7
273        punpckhwd xmm0,xmm7
274        movdqa    xmm5,xmm2
275        movdqa    xmm7,xmm0
276        pmaddwd   xmm2,[rel PW_MF078_F117]      ; xmm2=z3L
277        pmaddwd   xmm0,[rel PW_MF078_F117]      ; xmm0=z3H
278        pmaddwd   xmm5,[rel PW_F117_F078]       ; xmm5=z4L
279        pmaddwd   xmm7,[rel PW_F117_F078]       ; xmm7=z4H
280
281        movdqa  XMMWORD [wk(10)], xmm2  ; wk(10)=z3L
282        movdqa  XMMWORD [wk(11)], xmm0  ; wk(11)=z3H
283
284        ; (Original)
285        ; z1 = tmp0 + tmp3;  z2 = tmp1 + tmp2;
286        ; tmp0 = tmp0 * 0.298631336;  tmp1 = tmp1 * 2.053119869;
287        ; tmp2 = tmp2 * 3.072711026;  tmp3 = tmp3 * 1.501321110;
288        ; z1 = z1 * -0.899976223;  z2 = z2 * -2.562915447;
289        ; tmp0 += z1 + z3;  tmp1 += z2 + z4;
290        ; tmp2 += z2 + z3;  tmp3 += z1 + z4;
291        ;
292        ; (This implementation)
293        ; tmp0 = tmp0 * (0.298631336 - 0.899976223) + tmp3 * -0.899976223;
294        ; tmp1 = tmp1 * (2.053119869 - 2.562915447) + tmp2 * -2.562915447;
295        ; tmp2 = tmp1 * -2.562915447 + tmp2 * (3.072711026 - 2.562915447);
296        ; tmp3 = tmp0 * -0.899976223 + tmp3 * (1.501321110 - 0.899976223);
297        ; tmp0 += z3;  tmp1 += z4;
298        ; tmp2 += z3;  tmp3 += z4;
299
300        movdqa    xmm2,xmm3
301        movdqa    xmm0,xmm3
302        punpcklwd xmm2,xmm4
303        punpckhwd xmm0,xmm4
304        movdqa    xmm3,xmm2
305        movdqa    xmm4,xmm0
306        pmaddwd   xmm2,[rel PW_MF060_MF089]     ; xmm2=tmp0L
307        pmaddwd   xmm0,[rel PW_MF060_MF089]     ; xmm0=tmp0H
308        pmaddwd   xmm3,[rel PW_MF089_F060]      ; xmm3=tmp3L
309        pmaddwd   xmm4,[rel PW_MF089_F060]      ; xmm4=tmp3H
310
311        paddd   xmm2, XMMWORD [wk(10)]  ; xmm2=tmp0L
312        paddd   xmm0, XMMWORD [wk(11)]  ; xmm0=tmp0H
313        paddd   xmm3,xmm5               ; xmm3=tmp3L
314        paddd   xmm4,xmm7               ; xmm4=tmp3H
315
316        movdqa  XMMWORD [wk(8)], xmm2   ; wk(8)=tmp0L
317        movdqa  XMMWORD [wk(9)], xmm0   ; wk(9)=tmp0H
318
319        movdqa    xmm2,xmm1
320        movdqa    xmm0,xmm1
321        punpcklwd xmm2,xmm6
322        punpckhwd xmm0,xmm6
323        movdqa    xmm1,xmm2
324        movdqa    xmm6,xmm0
325        pmaddwd   xmm2,[rel PW_MF050_MF256]     ; xmm2=tmp1L
326        pmaddwd   xmm0,[rel PW_MF050_MF256]     ; xmm0=tmp1H
327        pmaddwd   xmm1,[rel PW_MF256_F050]      ; xmm1=tmp2L
328        pmaddwd   xmm6,[rel PW_MF256_F050]      ; xmm6=tmp2H
329
330        paddd   xmm2,xmm5               ; xmm2=tmp1L
331        paddd   xmm0,xmm7               ; xmm0=tmp1H
332        paddd   xmm1, XMMWORD [wk(10)]  ; xmm1=tmp2L
333        paddd   xmm6, XMMWORD [wk(11)]  ; xmm6=tmp2H
334
335        movdqa  XMMWORD [wk(10)], xmm2  ; wk(10)=tmp1L
336        movdqa  XMMWORD [wk(11)], xmm0  ; wk(11)=tmp1H
337
338        ; -- Final output stage
339
340        movdqa  xmm5, XMMWORD [wk(0)]   ; xmm5=tmp10L
341        movdqa  xmm7, XMMWORD [wk(1)]   ; xmm7=tmp10H
342
343        movdqa  xmm2,xmm5
344        movdqa  xmm0,xmm7
345        paddd   xmm5,xmm3               ; xmm5=data0L
346        paddd   xmm7,xmm4               ; xmm7=data0H
347        psubd   xmm2,xmm3               ; xmm2=data7L
348        psubd   xmm0,xmm4               ; xmm0=data7H
349
350        movdqa  xmm3,[rel PD_DESCALE_P1]        ; xmm3=[rel PD_DESCALE_P1]
351
352        paddd   xmm5,xmm3
353        paddd   xmm7,xmm3
354        psrad   xmm5,DESCALE_P1
355        psrad   xmm7,DESCALE_P1
356        paddd   xmm2,xmm3
357        paddd   xmm0,xmm3
358        psrad   xmm2,DESCALE_P1
359        psrad   xmm0,DESCALE_P1
360
361        packssdw  xmm5,xmm7             ; xmm5=data0=(00 01 02 03 04 05 06 07)
362        packssdw  xmm2,xmm0             ; xmm2=data7=(70 71 72 73 74 75 76 77)
363
364        movdqa  xmm4, XMMWORD [wk(4)]   ; xmm4=tmp11L
365        movdqa  xmm3, XMMWORD [wk(5)]   ; xmm3=tmp11H
366
367        movdqa  xmm7,xmm4
368        movdqa  xmm0,xmm3
369        paddd   xmm4,xmm1               ; xmm4=data1L
370        paddd   xmm3,xmm6               ; xmm3=data1H
371        psubd   xmm7,xmm1               ; xmm7=data6L
372        psubd   xmm0,xmm6               ; xmm0=data6H
373
374        movdqa  xmm1,[rel PD_DESCALE_P1]        ; xmm1=[rel PD_DESCALE_P1]
375
376        paddd   xmm4,xmm1
377        paddd   xmm3,xmm1
378        psrad   xmm4,DESCALE_P1
379        psrad   xmm3,DESCALE_P1
380        paddd   xmm7,xmm1
381        paddd   xmm0,xmm1
382        psrad   xmm7,DESCALE_P1
383        psrad   xmm0,DESCALE_P1
384
385        packssdw  xmm4,xmm3             ; xmm4=data1=(10 11 12 13 14 15 16 17)
386        packssdw  xmm7,xmm0             ; xmm7=data6=(60 61 62 63 64 65 66 67)
387
388        movdqa    xmm6,xmm5             ; transpose coefficients(phase 1)
389        punpcklwd xmm5,xmm4             ; xmm5=(00 10 01 11 02 12 03 13)
390        punpckhwd xmm6,xmm4             ; xmm6=(04 14 05 15 06 16 07 17)
391        movdqa    xmm1,xmm7             ; transpose coefficients(phase 1)
392        punpcklwd xmm7,xmm2             ; xmm7=(60 70 61 71 62 72 63 73)
393        punpckhwd xmm1,xmm2             ; xmm1=(64 74 65 75 66 76 67 77)
394
395        movdqa  xmm3, XMMWORD [wk(6)]   ; xmm3=tmp12L
396        movdqa  xmm0, XMMWORD [wk(7)]   ; xmm0=tmp12H
397        movdqa  xmm4, XMMWORD [wk(10)]  ; xmm4=tmp1L
398        movdqa  xmm2, XMMWORD [wk(11)]  ; xmm2=tmp1H
399
400        movdqa  XMMWORD [wk(0)], xmm5   ; wk(0)=(00 10 01 11 02 12 03 13)
401        movdqa  XMMWORD [wk(1)], xmm6   ; wk(1)=(04 14 05 15 06 16 07 17)
402        movdqa  XMMWORD [wk(4)], xmm7   ; wk(4)=(60 70 61 71 62 72 63 73)
403        movdqa  XMMWORD [wk(5)], xmm1   ; wk(5)=(64 74 65 75 66 76 67 77)
404
405        movdqa  xmm5,xmm3
406        movdqa  xmm6,xmm0
407        paddd   xmm3,xmm4               ; xmm3=data2L
408        paddd   xmm0,xmm2               ; xmm0=data2H
409        psubd   xmm5,xmm4               ; xmm5=data5L
410        psubd   xmm6,xmm2               ; xmm6=data5H
411
412        movdqa  xmm7,[rel PD_DESCALE_P1]        ; xmm7=[rel PD_DESCALE_P1]
413
414        paddd   xmm3,xmm7
415        paddd   xmm0,xmm7
416        psrad   xmm3,DESCALE_P1
417        psrad   xmm0,DESCALE_P1
418        paddd   xmm5,xmm7
419        paddd   xmm6,xmm7
420        psrad   xmm5,DESCALE_P1
421        psrad   xmm6,DESCALE_P1
422
423        packssdw  xmm3,xmm0             ; xmm3=data2=(20 21 22 23 24 25 26 27)
424        packssdw  xmm5,xmm6             ; xmm5=data5=(50 51 52 53 54 55 56 57)
425
426        movdqa  xmm1, XMMWORD [wk(2)]   ; xmm1=tmp13L
427        movdqa  xmm4, XMMWORD [wk(3)]   ; xmm4=tmp13H
428        movdqa  xmm2, XMMWORD [wk(8)]   ; xmm2=tmp0L
429        movdqa  xmm7, XMMWORD [wk(9)]   ; xmm7=tmp0H
430
431        movdqa  xmm0,xmm1
432        movdqa  xmm6,xmm4
433        paddd   xmm1,xmm2               ; xmm1=data3L
434        paddd   xmm4,xmm7               ; xmm4=data3H
435        psubd   xmm0,xmm2               ; xmm0=data4L
436        psubd   xmm6,xmm7               ; xmm6=data4H
437
438        movdqa  xmm2,[rel PD_DESCALE_P1]        ; xmm2=[rel PD_DESCALE_P1]
439
440        paddd   xmm1,xmm2
441        paddd   xmm4,xmm2
442        psrad   xmm1,DESCALE_P1
443        psrad   xmm4,DESCALE_P1
444        paddd   xmm0,xmm2
445        paddd   xmm6,xmm2
446        psrad   xmm0,DESCALE_P1
447        psrad   xmm6,DESCALE_P1
448
449        packssdw  xmm1,xmm4             ; xmm1=data3=(30 31 32 33 34 35 36 37)
450        packssdw  xmm0,xmm6             ; xmm0=data4=(40 41 42 43 44 45 46 47)
451
452        movdqa  xmm7, XMMWORD [wk(0)]   ; xmm7=(00 10 01 11 02 12 03 13)
453        movdqa  xmm2, XMMWORD [wk(1)]   ; xmm2=(04 14 05 15 06 16 07 17)
454
455        movdqa    xmm4,xmm3             ; transpose coefficients(phase 1)
456        punpcklwd xmm3,xmm1             ; xmm3=(20 30 21 31 22 32 23 33)
457        punpckhwd xmm4,xmm1             ; xmm4=(24 34 25 35 26 36 27 37)
458        movdqa    xmm6,xmm0             ; transpose coefficients(phase 1)
459        punpcklwd xmm0,xmm5             ; xmm0=(40 50 41 51 42 52 43 53)
460        punpckhwd xmm6,xmm5             ; xmm6=(44 54 45 55 46 56 47 57)
461
462        movdqa    xmm1,xmm7             ; transpose coefficients(phase 2)
463        punpckldq xmm7,xmm3             ; xmm7=(00 10 20 30 01 11 21 31)
464        punpckhdq xmm1,xmm3             ; xmm1=(02 12 22 32 03 13 23 33)
465        movdqa    xmm5,xmm2             ; transpose coefficients(phase 2)
466        punpckldq xmm2,xmm4             ; xmm2=(04 14 24 34 05 15 25 35)
467        punpckhdq xmm5,xmm4             ; xmm5=(06 16 26 36 07 17 27 37)
468
469        movdqa  xmm3, XMMWORD [wk(4)]   ; xmm3=(60 70 61 71 62 72 63 73)
470        movdqa  xmm4, XMMWORD [wk(5)]   ; xmm4=(64 74 65 75 66 76 67 77)
471
472        movdqa  XMMWORD [wk(6)], xmm2   ; wk(6)=(04 14 24 34 05 15 25 35)
473        movdqa  XMMWORD [wk(7)], xmm5   ; wk(7)=(06 16 26 36 07 17 27 37)
474
475        movdqa    xmm2,xmm0             ; transpose coefficients(phase 2)
476        punpckldq xmm0,xmm3             ; xmm0=(40 50 60 70 41 51 61 71)
477        punpckhdq xmm2,xmm3             ; xmm2=(42 52 62 72 43 53 63 73)
478        movdqa    xmm5,xmm6             ; transpose coefficients(phase 2)
479        punpckldq xmm6,xmm4             ; xmm6=(44 54 64 74 45 55 65 75)
480        punpckhdq xmm5,xmm4             ; xmm5=(46 56 66 76 47 57 67 77)
481
482        movdqa     xmm3,xmm7            ; transpose coefficients(phase 3)
483        punpcklqdq xmm7,xmm0            ; xmm7=col0=(00 10 20 30 40 50 60 70)
484        punpckhqdq xmm3,xmm0            ; xmm3=col1=(01 11 21 31 41 51 61 71)
485        movdqa     xmm4,xmm1            ; transpose coefficients(phase 3)
486        punpcklqdq xmm1,xmm2            ; xmm1=col2=(02 12 22 32 42 52 62 72)
487        punpckhqdq xmm4,xmm2            ; xmm4=col3=(03 13 23 33 43 53 63 73)
488
489        movdqa  xmm0, XMMWORD [wk(6)]   ; xmm0=(04 14 24 34 05 15 25 35)
490        movdqa  xmm2, XMMWORD [wk(7)]   ; xmm2=(06 16 26 36 07 17 27 37)
491
492        movdqa  XMMWORD [wk(8)], xmm3   ; wk(8)=col1
493        movdqa  XMMWORD [wk(9)], xmm4   ; wk(9)=col3
494
495        movdqa     xmm3,xmm0            ; transpose coefficients(phase 3)
496        punpcklqdq xmm0,xmm6            ; xmm0=col4=(04 14 24 34 44 54 64 74)
497        punpckhqdq xmm3,xmm6            ; xmm3=col5=(05 15 25 35 45 55 65 75)
498        movdqa     xmm4,xmm2            ; transpose coefficients(phase 3)
499        punpcklqdq xmm2,xmm5            ; xmm2=col6=(06 16 26 36 46 56 66 76)
500        punpckhqdq xmm4,xmm5            ; xmm4=col7=(07 17 27 37 47 57 67 77)
501
502        movdqa  XMMWORD [wk(10)], xmm3  ; wk(10)=col5
503        movdqa  XMMWORD [wk(11)], xmm4  ; wk(11)=col7
504.column_end:
505
506        ; -- Prefetch the next coefficient block
507
508        prefetchnta [rsi + DCTSIZE2*SIZEOF_JCOEF + 0*32]
509        prefetchnta [rsi + DCTSIZE2*SIZEOF_JCOEF + 1*32]
510        prefetchnta [rsi + DCTSIZE2*SIZEOF_JCOEF + 2*32]
511        prefetchnta [rsi + DCTSIZE2*SIZEOF_JCOEF + 3*32]
512
513        ; ---- Pass 2: process rows from work array, store into output array.
514
515        mov     rax, [original_rbp]
516        mov     rdi, r12        ; (JSAMPROW *)
517        mov     eax, r13d
518
519        ; -- Even part
520
521        ; xmm7=col0, xmm1=col2, xmm0=col4, xmm2=col6
522
523        ; (Original)
524        ; z1 = (z2 + z3) * 0.541196100;
525        ; tmp2 = z1 + z3 * -1.847759065;
526        ; tmp3 = z1 + z2 * 0.765366865;
527        ;
528        ; (This implementation)
529        ; tmp2 = z2 * 0.541196100 + z3 * (0.541196100 - 1.847759065);
530        ; tmp3 = z2 * (0.541196100 + 0.765366865) + z3 * 0.541196100;
531
532        movdqa    xmm6,xmm1             ; xmm1=in2=z2
533        movdqa    xmm5,xmm1
534        punpcklwd xmm6,xmm2             ; xmm2=in6=z3
535        punpckhwd xmm5,xmm2
536        movdqa    xmm1,xmm6
537        movdqa    xmm2,xmm5
538        pmaddwd   xmm6,[rel PW_F130_F054]       ; xmm6=tmp3L
539        pmaddwd   xmm5,[rel PW_F130_F054]       ; xmm5=tmp3H
540        pmaddwd   xmm1,[rel PW_F054_MF130]      ; xmm1=tmp2L
541        pmaddwd   xmm2,[rel PW_F054_MF130]      ; xmm2=tmp2H
542
543        movdqa    xmm3,xmm7
544        paddw     xmm7,xmm0             ; xmm7=in0+in4
545        psubw     xmm3,xmm0             ; xmm3=in0-in4
546
547        pxor      xmm4,xmm4
548        pxor      xmm0,xmm0
549        punpcklwd xmm4,xmm7             ; xmm4=tmp0L
550        punpckhwd xmm0,xmm7             ; xmm0=tmp0H
551        psrad     xmm4,(16-CONST_BITS)  ; psrad xmm4,16 & pslld xmm4,CONST_BITS
552        psrad     xmm0,(16-CONST_BITS)  ; psrad xmm0,16 & pslld xmm0,CONST_BITS
553
554        movdqa  xmm7,xmm4
555        paddd   xmm4,xmm6               ; xmm4=tmp10L
556        psubd   xmm7,xmm6               ; xmm7=tmp13L
557        movdqa  xmm6,xmm0
558        paddd   xmm0,xmm5               ; xmm0=tmp10H
559        psubd   xmm6,xmm5               ; xmm6=tmp13H
560
561        movdqa  XMMWORD [wk(0)], xmm4   ; wk(0)=tmp10L
562        movdqa  XMMWORD [wk(1)], xmm0   ; wk(1)=tmp10H
563        movdqa  XMMWORD [wk(2)], xmm7   ; wk(2)=tmp13L
564        movdqa  XMMWORD [wk(3)], xmm6   ; wk(3)=tmp13H
565
566        pxor      xmm5,xmm5
567        pxor      xmm4,xmm4
568        punpcklwd xmm5,xmm3             ; xmm5=tmp1L
569        punpckhwd xmm4,xmm3             ; xmm4=tmp1H
570        psrad     xmm5,(16-CONST_BITS)  ; psrad xmm5,16 & pslld xmm5,CONST_BITS
571        psrad     xmm4,(16-CONST_BITS)  ; psrad xmm4,16 & pslld xmm4,CONST_BITS
572
573        movdqa  xmm0,xmm5
574        paddd   xmm5,xmm1               ; xmm5=tmp11L
575        psubd   xmm0,xmm1               ; xmm0=tmp12L
576        movdqa  xmm7,xmm4
577        paddd   xmm4,xmm2               ; xmm4=tmp11H
578        psubd   xmm7,xmm2               ; xmm7=tmp12H
579
580        movdqa  XMMWORD [wk(4)], xmm5   ; wk(4)=tmp11L
581        movdqa  XMMWORD [wk(5)], xmm4   ; wk(5)=tmp11H
582        movdqa  XMMWORD [wk(6)], xmm0   ; wk(6)=tmp12L
583        movdqa  XMMWORD [wk(7)], xmm7   ; wk(7)=tmp12H
584
585        ; -- Odd part
586
587        movdqa  xmm6, XMMWORD [wk(9)]   ; xmm6=col3
588        movdqa  xmm3, XMMWORD [wk(8)]   ; xmm3=col1
589        movdqa  xmm1, XMMWORD [wk(11)]  ; xmm1=col7
590        movdqa  xmm2, XMMWORD [wk(10)]  ; xmm2=col5
591
592        movdqa  xmm5,xmm6
593        movdqa  xmm4,xmm3
594        paddw   xmm5,xmm1               ; xmm5=z3
595        paddw   xmm4,xmm2               ; xmm4=z4
596
597        ; (Original)
598        ; z5 = (z3 + z4) * 1.175875602;
599        ; z3 = z3 * -1.961570560;  z4 = z4 * -0.390180644;
600        ; z3 += z5;  z4 += z5;
601        ;
602        ; (This implementation)
603        ; z3 = z3 * (1.175875602 - 1.961570560) + z4 * 1.175875602;
604        ; z4 = z3 * 1.175875602 + z4 * (1.175875602 - 0.390180644);
605
606        movdqa    xmm0,xmm5
607        movdqa    xmm7,xmm5
608        punpcklwd xmm0,xmm4
609        punpckhwd xmm7,xmm4
610        movdqa    xmm5,xmm0
611        movdqa    xmm4,xmm7
612        pmaddwd   xmm0,[rel PW_MF078_F117]      ; xmm0=z3L
613        pmaddwd   xmm7,[rel PW_MF078_F117]      ; xmm7=z3H
614        pmaddwd   xmm5,[rel PW_F117_F078]       ; xmm5=z4L
615        pmaddwd   xmm4,[rel PW_F117_F078]       ; xmm4=z4H
616
617        movdqa  XMMWORD [wk(10)], xmm0  ; wk(10)=z3L
618        movdqa  XMMWORD [wk(11)], xmm7  ; wk(11)=z3H
619
620        ; (Original)
621        ; z1 = tmp0 + tmp3;  z2 = tmp1 + tmp2;
622        ; tmp0 = tmp0 * 0.298631336;  tmp1 = tmp1 * 2.053119869;
623        ; tmp2 = tmp2 * 3.072711026;  tmp3 = tmp3 * 1.501321110;
624        ; z1 = z1 * -0.899976223;  z2 = z2 * -2.562915447;
625        ; tmp0 += z1 + z3;  tmp1 += z2 + z4;
626        ; tmp2 += z2 + z3;  tmp3 += z1 + z4;
627        ;
628        ; (This implementation)
629        ; tmp0 = tmp0 * (0.298631336 - 0.899976223) + tmp3 * -0.899976223;
630        ; tmp1 = tmp1 * (2.053119869 - 2.562915447) + tmp2 * -2.562915447;
631        ; tmp2 = tmp1 * -2.562915447 + tmp2 * (3.072711026 - 2.562915447);
632        ; tmp3 = tmp0 * -0.899976223 + tmp3 * (1.501321110 - 0.899976223);
633        ; tmp0 += z3;  tmp1 += z4;
634        ; tmp2 += z3;  tmp3 += z4;
635
636        movdqa    xmm0,xmm1
637        movdqa    xmm7,xmm1
638        punpcklwd xmm0,xmm3
639        punpckhwd xmm7,xmm3
640        movdqa    xmm1,xmm0
641        movdqa    xmm3,xmm7
642        pmaddwd   xmm0,[rel PW_MF060_MF089]     ; xmm0=tmp0L
643        pmaddwd   xmm7,[rel PW_MF060_MF089]     ; xmm7=tmp0H
644        pmaddwd   xmm1,[rel PW_MF089_F060]      ; xmm1=tmp3L
645        pmaddwd   xmm3,[rel PW_MF089_F060]      ; xmm3=tmp3H
646
647        paddd   xmm0, XMMWORD [wk(10)]  ; xmm0=tmp0L
648        paddd   xmm7, XMMWORD [wk(11)]  ; xmm7=tmp0H
649        paddd   xmm1,xmm5               ; xmm1=tmp3L
650        paddd   xmm3,xmm4               ; xmm3=tmp3H
651
652        movdqa  XMMWORD [wk(8)], xmm0   ; wk(8)=tmp0L
653        movdqa  XMMWORD [wk(9)], xmm7   ; wk(9)=tmp0H
654
655        movdqa    xmm0,xmm2
656        movdqa    xmm7,xmm2
657        punpcklwd xmm0,xmm6
658        punpckhwd xmm7,xmm6
659        movdqa    xmm2,xmm0
660        movdqa    xmm6,xmm7
661        pmaddwd   xmm0,[rel PW_MF050_MF256]     ; xmm0=tmp1L
662        pmaddwd   xmm7,[rel PW_MF050_MF256]     ; xmm7=tmp1H
663        pmaddwd   xmm2,[rel PW_MF256_F050]      ; xmm2=tmp2L
664        pmaddwd   xmm6,[rel PW_MF256_F050]      ; xmm6=tmp2H
665
666        paddd   xmm0,xmm5               ; xmm0=tmp1L
667        paddd   xmm7,xmm4               ; xmm7=tmp1H
668        paddd   xmm2, XMMWORD [wk(10)]  ; xmm2=tmp2L
669        paddd   xmm6, XMMWORD [wk(11)]  ; xmm6=tmp2H
670
671        movdqa  XMMWORD [wk(10)], xmm0  ; wk(10)=tmp1L
672        movdqa  XMMWORD [wk(11)], xmm7  ; wk(11)=tmp1H
673
674        ; -- Final output stage
675
676        movdqa  xmm5, XMMWORD [wk(0)]   ; xmm5=tmp10L
677        movdqa  xmm4, XMMWORD [wk(1)]   ; xmm4=tmp10H
678
679        movdqa  xmm0,xmm5
680        movdqa  xmm7,xmm4
681        paddd   xmm5,xmm1               ; xmm5=data0L
682        paddd   xmm4,xmm3               ; xmm4=data0H
683        psubd   xmm0,xmm1               ; xmm0=data7L
684        psubd   xmm7,xmm3               ; xmm7=data7H
685
686        movdqa  xmm1,[rel PD_DESCALE_P2]        ; xmm1=[rel PD_DESCALE_P2]
687
688        paddd   xmm5,xmm1
689        paddd   xmm4,xmm1
690        psrad   xmm5,DESCALE_P2
691        psrad   xmm4,DESCALE_P2
692        paddd   xmm0,xmm1
693        paddd   xmm7,xmm1
694        psrad   xmm0,DESCALE_P2
695        psrad   xmm7,DESCALE_P2
696
697        packssdw  xmm5,xmm4             ; xmm5=data0=(00 10 20 30 40 50 60 70)
698        packssdw  xmm0,xmm7             ; xmm0=data7=(07 17 27 37 47 57 67 77)
699
700        movdqa  xmm3, XMMWORD [wk(4)]   ; xmm3=tmp11L
701        movdqa  xmm1, XMMWORD [wk(5)]   ; xmm1=tmp11H
702
703        movdqa  xmm4,xmm3
704        movdqa  xmm7,xmm1
705        paddd   xmm3,xmm2               ; xmm3=data1L
706        paddd   xmm1,xmm6               ; xmm1=data1H
707        psubd   xmm4,xmm2               ; xmm4=data6L
708        psubd   xmm7,xmm6               ; xmm7=data6H
709
710        movdqa  xmm2,[rel PD_DESCALE_P2]        ; xmm2=[rel PD_DESCALE_P2]
711
712        paddd   xmm3,xmm2
713        paddd   xmm1,xmm2
714        psrad   xmm3,DESCALE_P2
715        psrad   xmm1,DESCALE_P2
716        paddd   xmm4,xmm2
717        paddd   xmm7,xmm2
718        psrad   xmm4,DESCALE_P2
719        psrad   xmm7,DESCALE_P2
720
721        packssdw  xmm3,xmm1             ; xmm3=data1=(01 11 21 31 41 51 61 71)
722        packssdw  xmm4,xmm7             ; xmm4=data6=(06 16 26 36 46 56 66 76)
723
724        packsswb  xmm5,xmm4             ; xmm5=(00 10 20 30 40 50 60 70 06 16 26 36 46 56 66 76)
725        packsswb  xmm3,xmm0             ; xmm3=(01 11 21 31 41 51 61 71 07 17 27 37 47 57 67 77)
726
727        movdqa  xmm6, XMMWORD [wk(6)]   ; xmm6=tmp12L
728        movdqa  xmm2, XMMWORD [wk(7)]   ; xmm2=tmp12H
729        movdqa  xmm1, XMMWORD [wk(10)]  ; xmm1=tmp1L
730        movdqa  xmm7, XMMWORD [wk(11)]  ; xmm7=tmp1H
731
732        movdqa  XMMWORD [wk(0)], xmm5   ; wk(0)=(00 10 20 30 40 50 60 70 06 16 26 36 46 56 66 76)
733        movdqa  XMMWORD [wk(1)], xmm3   ; wk(1)=(01 11 21 31 41 51 61 71 07 17 27 37 47 57 67 77)
734
735        movdqa  xmm4,xmm6
736        movdqa  xmm0,xmm2
737        paddd   xmm6,xmm1               ; xmm6=data2L
738        paddd   xmm2,xmm7               ; xmm2=data2H
739        psubd   xmm4,xmm1               ; xmm4=data5L
740        psubd   xmm0,xmm7               ; xmm0=data5H
741
742        movdqa  xmm5,[rel PD_DESCALE_P2]        ; xmm5=[rel PD_DESCALE_P2]
743
744        paddd   xmm6,xmm5
745        paddd   xmm2,xmm5
746        psrad   xmm6,DESCALE_P2
747        psrad   xmm2,DESCALE_P2
748        paddd   xmm4,xmm5
749        paddd   xmm0,xmm5
750        psrad   xmm4,DESCALE_P2
751        psrad   xmm0,DESCALE_P2
752
753        packssdw  xmm6,xmm2             ; xmm6=data2=(02 12 22 32 42 52 62 72)
754        packssdw  xmm4,xmm0             ; xmm4=data5=(05 15 25 35 45 55 65 75)
755
756        movdqa  xmm3, XMMWORD [wk(2)]   ; xmm3=tmp13L
757        movdqa  xmm1, XMMWORD [wk(3)]   ; xmm1=tmp13H
758        movdqa  xmm7, XMMWORD [wk(8)]   ; xmm7=tmp0L
759        movdqa  xmm5, XMMWORD [wk(9)]   ; xmm5=tmp0H
760
761        movdqa  xmm2,xmm3
762        movdqa  xmm0,xmm1
763        paddd   xmm3,xmm7               ; xmm3=data3L
764        paddd   xmm1,xmm5               ; xmm1=data3H
765        psubd   xmm2,xmm7               ; xmm2=data4L
766        psubd   xmm0,xmm5               ; xmm0=data4H
767
768        movdqa  xmm7,[rel PD_DESCALE_P2]        ; xmm7=[rel PD_DESCALE_P2]
769
770        paddd   xmm3,xmm7
771        paddd   xmm1,xmm7
772        psrad   xmm3,DESCALE_P2
773        psrad   xmm1,DESCALE_P2
774        paddd   xmm2,xmm7
775        paddd   xmm0,xmm7
776        psrad   xmm2,DESCALE_P2
777        psrad   xmm0,DESCALE_P2
778
779        movdqa    xmm5,[rel PB_CENTERJSAMP]     ; xmm5=[rel PB_CENTERJSAMP]
780
781        packssdw  xmm3,xmm1             ; xmm3=data3=(03 13 23 33 43 53 63 73)
782        packssdw  xmm2,xmm0             ; xmm2=data4=(04 14 24 34 44 54 64 74)
783
784        movdqa    xmm7, XMMWORD [wk(0)] ; xmm7=(00 10 20 30 40 50 60 70 06 16 26 36 46 56 66 76)
785        movdqa    xmm1, XMMWORD [wk(1)] ; xmm1=(01 11 21 31 41 51 61 71 07 17 27 37 47 57 67 77)
786
787        packsswb  xmm6,xmm2             ; xmm6=(02 12 22 32 42 52 62 72 04 14 24 34 44 54 64 74)
788        packsswb  xmm3,xmm4             ; xmm3=(03 13 23 33 43 53 63 73 05 15 25 35 45 55 65 75)
789
790        paddb     xmm7,xmm5
791        paddb     xmm1,xmm5
792        paddb     xmm6,xmm5
793        paddb     xmm3,xmm5
794
795        movdqa    xmm0,xmm7     ; transpose coefficients(phase 1)
796        punpcklbw xmm7,xmm1     ; xmm7=(00 01 10 11 20 21 30 31 40 41 50 51 60 61 70 71)
797        punpckhbw xmm0,xmm1     ; xmm0=(06 07 16 17 26 27 36 37 46 47 56 57 66 67 76 77)
798        movdqa    xmm2,xmm6     ; transpose coefficients(phase 1)
799        punpcklbw xmm6,xmm3     ; xmm6=(02 03 12 13 22 23 32 33 42 43 52 53 62 63 72 73)
800        punpckhbw xmm2,xmm3     ; xmm2=(04 05 14 15 24 25 34 35 44 45 54 55 64 65 74 75)
801
802        movdqa    xmm4,xmm7     ; transpose coefficients(phase 2)
803        punpcklwd xmm7,xmm6     ; xmm7=(00 01 02 03 10 11 12 13 20 21 22 23 30 31 32 33)
804        punpckhwd xmm4,xmm6     ; xmm4=(40 41 42 43 50 51 52 53 60 61 62 63 70 71 72 73)
805        movdqa    xmm5,xmm2     ; transpose coefficients(phase 2)
806        punpcklwd xmm2,xmm0     ; xmm2=(04 05 06 07 14 15 16 17 24 25 26 27 34 35 36 37)
807        punpckhwd xmm5,xmm0     ; xmm5=(44 45 46 47 54 55 56 57 64 65 66 67 74 75 76 77)
808
809        movdqa    xmm1,xmm7     ; transpose coefficients(phase 3)
810        punpckldq xmm7,xmm2     ; xmm7=(00 01 02 03 04 05 06 07 10 11 12 13 14 15 16 17)
811        punpckhdq xmm1,xmm2     ; xmm1=(20 21 22 23 24 25 26 27 30 31 32 33 34 35 36 37)
812        movdqa    xmm3,xmm4     ; transpose coefficients(phase 3)
813        punpckldq xmm4,xmm5     ; xmm4=(40 41 42 43 44 45 46 47 50 51 52 53 54 55 56 57)
814        punpckhdq xmm3,xmm5     ; xmm3=(60 61 62 63 64 65 66 67 70 71 72 73 74 75 76 77)
815
816        pshufd  xmm6,xmm7,0x4E  ; xmm6=(10 11 12 13 14 15 16 17 00 01 02 03 04 05 06 07)
817        pshufd  xmm0,xmm1,0x4E  ; xmm0=(30 31 32 33 34 35 36 37 20 21 22 23 24 25 26 27)
818        pshufd  xmm2,xmm4,0x4E  ; xmm2=(50 51 52 53 54 55 56 57 40 41 42 43 44 45 46 47)
819        pshufd  xmm5,xmm3,0x4E  ; xmm5=(70 71 72 73 74 75 76 77 60 61 62 63 64 65 66 67)
820
821        mov     rdx, JSAMPROW [rdi+0*SIZEOF_JSAMPROW]
822        mov     rsi, JSAMPROW [rdi+2*SIZEOF_JSAMPROW]
823        movq    XMM_MMWORD [rdx+rax*SIZEOF_JSAMPLE], xmm7
824        movq    XMM_MMWORD [rsi+rax*SIZEOF_JSAMPLE], xmm1
825        mov     rdx, JSAMPROW [rdi+4*SIZEOF_JSAMPROW]
826        mov     rsi, JSAMPROW [rdi+6*SIZEOF_JSAMPROW]
827        movq    XMM_MMWORD [rdx+rax*SIZEOF_JSAMPLE], xmm4
828        movq    XMM_MMWORD [rsi+rax*SIZEOF_JSAMPLE], xmm3
829
830        mov     rdx, JSAMPROW [rdi+1*SIZEOF_JSAMPROW]
831        mov     rsi, JSAMPROW [rdi+3*SIZEOF_JSAMPROW]
832        movq    XMM_MMWORD [rdx+rax*SIZEOF_JSAMPLE], xmm6
833        movq    XMM_MMWORD [rsi+rax*SIZEOF_JSAMPLE], xmm0
834        mov     rdx, JSAMPROW [rdi+5*SIZEOF_JSAMPROW]
835        mov     rsi, JSAMPROW [rdi+7*SIZEOF_JSAMPROW]
836        movq    XMM_MMWORD [rdx+rax*SIZEOF_JSAMPLE], xmm2
837        movq    XMM_MMWORD [rsi+rax*SIZEOF_JSAMPLE], xmm5
838
839        uncollect_args
840        mov     rsp,rbp         ; rsp <- aligned rbp
841        pop     rsp             ; rsp <- original rbp
842        pop     rbp
843        ret
844
845; For some reason, the OS X linker does not honor the request to align the
846; segment unless we do this.
847        align   16
848