1;
2; jfdctfst.asm - fast integer FDCT (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 forward DCT (Discrete Cosine Transform). The following code is
19; based directly on the IJG's original jfdctfst.c; see the jfdctfst.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
31%if CONST_BITS == 8
32F_0_382 equ      98             ; FIX(0.382683433)
33F_0_541 equ     139             ; FIX(0.541196100)
34F_0_707 equ     181             ; FIX(0.707106781)
35F_1_306 equ     334             ; FIX(1.306562965)
36%else
37; NASM cannot do compile-time arithmetic on floating-point constants.
38%define DESCALE(x,n)  (((x)+(1<<((n)-1)))>>(n))
39F_0_382 equ     DESCALE( 410903207,30-CONST_BITS)       ; FIX(0.382683433)
40F_0_541 equ     DESCALE( 581104887,30-CONST_BITS)       ; FIX(0.541196100)
41F_0_707 equ     DESCALE( 759250124,30-CONST_BITS)       ; FIX(0.707106781)
42F_1_306 equ     DESCALE(1402911301,30-CONST_BITS)       ; FIX(1.306562965)
43%endif
44
45; --------------------------------------------------------------------------
46        SECTION SEG_CONST
47
48; PRE_MULTIPLY_SCALE_BITS <= 2 (to avoid overflow)
49; CONST_BITS + CONST_SHIFT + PRE_MULTIPLY_SCALE_BITS == 16 (for pmulhw)
50
51%define PRE_MULTIPLY_SCALE_BITS   2
52%define CONST_SHIFT     (16 - PRE_MULTIPLY_SCALE_BITS - CONST_BITS)
53
54        alignz  16
55        global  EXTN(jconst_fdct_ifast_mmx)
56
57EXTN(jconst_fdct_ifast_mmx):
58
59PW_F0707        times 4 dw  F_0_707 << CONST_SHIFT
60PW_F0382        times 4 dw  F_0_382 << CONST_SHIFT
61PW_F0541        times 4 dw  F_0_541 << CONST_SHIFT
62PW_F1306        times 4 dw  F_1_306 << CONST_SHIFT
63
64        alignz  16
65
66; --------------------------------------------------------------------------
67        SECTION SEG_TEXT
68        BITS    32
69;
70; Perform the forward DCT on one block of samples.
71;
72; GLOBAL(void)
73; jsimd_fdct_ifast_mmx (DCTELEM * data)
74;
75
76%define data(b)         (b)+8           ; DCTELEM * data
77
78%define original_ebp    ebp+0
79%define wk(i)           ebp-(WK_NUM-(i))*SIZEOF_MMWORD  ; mmword wk[WK_NUM]
80%define WK_NUM          2
81
82        align   16
83        global  EXTN(jsimd_fdct_ifast_mmx)
84
85EXTN(jsimd_fdct_ifast_mmx):
86        push    ebp
87        mov     eax,esp                         ; eax = original ebp
88        sub     esp, byte 4
89        and     esp, byte (-SIZEOF_MMWORD)      ; align to 64 bits
90        mov     [esp],eax
91        mov     ebp,esp                         ; ebp = aligned ebp
92        lea     esp, [wk(0)]
93        pushpic ebx
94;       push    ecx             ; need not be preserved
95;       push    edx             ; need not be preserved
96;       push    esi             ; unused
97;       push    edi             ; unused
98
99        get_GOT ebx             ; get GOT address
100
101        ; ---- Pass 1: process rows.
102
103        mov     edx, POINTER [data(eax)]        ; (DCTELEM *)
104        mov     ecx, DCTSIZE/4
105        alignx  16,7
106.rowloop:
107
108        movq    mm0, MMWORD [MMBLOCK(2,0,edx,SIZEOF_DCTELEM)]
109        movq    mm1, MMWORD [MMBLOCK(3,0,edx,SIZEOF_DCTELEM)]
110        movq    mm2, MMWORD [MMBLOCK(2,1,edx,SIZEOF_DCTELEM)]
111        movq    mm3, MMWORD [MMBLOCK(3,1,edx,SIZEOF_DCTELEM)]
112
113        ; mm0=(20 21 22 23), mm2=(24 25 26 27)
114        ; mm1=(30 31 32 33), mm3=(34 35 36 37)
115
116        movq      mm4,mm0               ; transpose coefficients(phase 1)
117        punpcklwd mm0,mm1               ; mm0=(20 30 21 31)
118        punpckhwd mm4,mm1               ; mm4=(22 32 23 33)
119        movq      mm5,mm2               ; transpose coefficients(phase 1)
120        punpcklwd mm2,mm3               ; mm2=(24 34 25 35)
121        punpckhwd mm5,mm3               ; mm5=(26 36 27 37)
122
123        movq    mm6, MMWORD [MMBLOCK(0,0,edx,SIZEOF_DCTELEM)]
124        movq    mm7, MMWORD [MMBLOCK(1,0,edx,SIZEOF_DCTELEM)]
125        movq    mm1, MMWORD [MMBLOCK(0,1,edx,SIZEOF_DCTELEM)]
126        movq    mm3, MMWORD [MMBLOCK(1,1,edx,SIZEOF_DCTELEM)]
127
128        ; mm6=(00 01 02 03), mm1=(04 05 06 07)
129        ; mm7=(10 11 12 13), mm3=(14 15 16 17)
130
131        movq    MMWORD [wk(0)], mm4     ; wk(0)=(22 32 23 33)
132        movq    MMWORD [wk(1)], mm2     ; wk(1)=(24 34 25 35)
133
134        movq      mm4,mm6               ; transpose coefficients(phase 1)
135        punpcklwd mm6,mm7               ; mm6=(00 10 01 11)
136        punpckhwd mm4,mm7               ; mm4=(02 12 03 13)
137        movq      mm2,mm1               ; transpose coefficients(phase 1)
138        punpcklwd mm1,mm3               ; mm1=(04 14 05 15)
139        punpckhwd mm2,mm3               ; mm2=(06 16 07 17)
140
141        movq      mm7,mm6               ; transpose coefficients(phase 2)
142        punpckldq mm6,mm0               ; mm6=(00 10 20 30)=data0
143        punpckhdq mm7,mm0               ; mm7=(01 11 21 31)=data1
144        movq      mm3,mm2               ; transpose coefficients(phase 2)
145        punpckldq mm2,mm5               ; mm2=(06 16 26 36)=data6
146        punpckhdq mm3,mm5               ; mm3=(07 17 27 37)=data7
147
148        movq    mm0,mm7
149        movq    mm5,mm6
150        psubw   mm7,mm2                 ; mm7=data1-data6=tmp6
151        psubw   mm6,mm3                 ; mm6=data0-data7=tmp7
152        paddw   mm0,mm2                 ; mm0=data1+data6=tmp1
153        paddw   mm5,mm3                 ; mm5=data0+data7=tmp0
154
155        movq    mm2, MMWORD [wk(0)]     ; mm2=(22 32 23 33)
156        movq    mm3, MMWORD [wk(1)]     ; mm3=(24 34 25 35)
157        movq    MMWORD [wk(0)], mm7     ; wk(0)=tmp6
158        movq    MMWORD [wk(1)], mm6     ; wk(1)=tmp7
159
160        movq      mm7,mm4               ; transpose coefficients(phase 2)
161        punpckldq mm4,mm2               ; mm4=(02 12 22 32)=data2
162        punpckhdq mm7,mm2               ; mm7=(03 13 23 33)=data3
163        movq      mm6,mm1               ; transpose coefficients(phase 2)
164        punpckldq mm1,mm3               ; mm1=(04 14 24 34)=data4
165        punpckhdq mm6,mm3               ; mm6=(05 15 25 35)=data5
166
167        movq    mm2,mm7
168        movq    mm3,mm4
169        paddw   mm7,mm1                 ; mm7=data3+data4=tmp3
170        paddw   mm4,mm6                 ; mm4=data2+data5=tmp2
171        psubw   mm2,mm1                 ; mm2=data3-data4=tmp4
172        psubw   mm3,mm6                 ; mm3=data2-data5=tmp5
173
174        ; -- Even part
175
176        movq    mm1,mm5
177        movq    mm6,mm0
178        psubw   mm5,mm7                 ; mm5=tmp13
179        psubw   mm0,mm4                 ; mm0=tmp12
180        paddw   mm1,mm7                 ; mm1=tmp10
181        paddw   mm6,mm4                 ; mm6=tmp11
182
183        paddw   mm0,mm5
184        psllw   mm0,PRE_MULTIPLY_SCALE_BITS
185        pmulhw  mm0,[GOTOFF(ebx,PW_F0707)] ; mm0=z1
186
187        movq    mm7,mm1
188        movq    mm4,mm5
189        psubw   mm1,mm6                 ; mm1=data4
190        psubw   mm5,mm0                 ; mm5=data6
191        paddw   mm7,mm6                 ; mm7=data0
192        paddw   mm4,mm0                 ; mm4=data2
193
194        movq    MMWORD [MMBLOCK(0,1,edx,SIZEOF_DCTELEM)], mm1
195        movq    MMWORD [MMBLOCK(2,1,edx,SIZEOF_DCTELEM)], mm5
196        movq    MMWORD [MMBLOCK(0,0,edx,SIZEOF_DCTELEM)], mm7
197        movq    MMWORD [MMBLOCK(2,0,edx,SIZEOF_DCTELEM)], mm4
198
199        ; -- Odd part
200
201        movq    mm6, MMWORD [wk(0)]     ; mm6=tmp6
202        movq    mm0, MMWORD [wk(1)]     ; mm0=tmp7
203
204        paddw   mm2,mm3                 ; mm2=tmp10
205        paddw   mm3,mm6                 ; mm3=tmp11
206        paddw   mm6,mm0                 ; mm6=tmp12, mm0=tmp7
207
208        psllw   mm2,PRE_MULTIPLY_SCALE_BITS
209        psllw   mm6,PRE_MULTIPLY_SCALE_BITS
210
211        psllw   mm3,PRE_MULTIPLY_SCALE_BITS
212        pmulhw  mm3,[GOTOFF(ebx,PW_F0707)] ; mm3=z3
213
214        movq    mm1,mm2                 ; mm1=tmp10
215        psubw   mm2,mm6
216        pmulhw  mm2,[GOTOFF(ebx,PW_F0382)] ; mm2=z5
217        pmulhw  mm1,[GOTOFF(ebx,PW_F0541)] ; mm1=MULTIPLY(tmp10,FIX_0_54119610)
218        pmulhw  mm6,[GOTOFF(ebx,PW_F1306)] ; mm6=MULTIPLY(tmp12,FIX_1_30656296)
219        paddw   mm1,mm2                 ; mm1=z2
220        paddw   mm6,mm2                 ; mm6=z4
221
222        movq    mm5,mm0
223        psubw   mm0,mm3                 ; mm0=z13
224        paddw   mm5,mm3                 ; mm5=z11
225
226        movq    mm7,mm0
227        movq    mm4,mm5
228        psubw   mm0,mm1                 ; mm0=data3
229        psubw   mm5,mm6                 ; mm5=data7
230        paddw   mm7,mm1                 ; mm7=data5
231        paddw   mm4,mm6                 ; mm4=data1
232
233        movq    MMWORD [MMBLOCK(3,0,edx,SIZEOF_DCTELEM)], mm0
234        movq    MMWORD [MMBLOCK(3,1,edx,SIZEOF_DCTELEM)], mm5
235        movq    MMWORD [MMBLOCK(1,1,edx,SIZEOF_DCTELEM)], mm7
236        movq    MMWORD [MMBLOCK(1,0,edx,SIZEOF_DCTELEM)], mm4
237
238        add     edx, byte 4*DCTSIZE*SIZEOF_DCTELEM
239        dec     ecx
240        jnz     near .rowloop
241
242        ; ---- Pass 2: process columns.
243
244        mov     edx, POINTER [data(eax)]        ; (DCTELEM *)
245        mov     ecx, DCTSIZE/4
246        alignx  16,7
247.columnloop:
248
249        movq    mm0, MMWORD [MMBLOCK(2,0,edx,SIZEOF_DCTELEM)]
250        movq    mm1, MMWORD [MMBLOCK(3,0,edx,SIZEOF_DCTELEM)]
251        movq    mm2, MMWORD [MMBLOCK(6,0,edx,SIZEOF_DCTELEM)]
252        movq    mm3, MMWORD [MMBLOCK(7,0,edx,SIZEOF_DCTELEM)]
253
254        ; mm0=(02 12 22 32), mm2=(42 52 62 72)
255        ; mm1=(03 13 23 33), mm3=(43 53 63 73)
256
257        movq      mm4,mm0               ; transpose coefficients(phase 1)
258        punpcklwd mm0,mm1               ; mm0=(02 03 12 13)
259        punpckhwd mm4,mm1               ; mm4=(22 23 32 33)
260        movq      mm5,mm2               ; transpose coefficients(phase 1)
261        punpcklwd mm2,mm3               ; mm2=(42 43 52 53)
262        punpckhwd mm5,mm3               ; mm5=(62 63 72 73)
263
264        movq    mm6, MMWORD [MMBLOCK(0,0,edx,SIZEOF_DCTELEM)]
265        movq    mm7, MMWORD [MMBLOCK(1,0,edx,SIZEOF_DCTELEM)]
266        movq    mm1, MMWORD [MMBLOCK(4,0,edx,SIZEOF_DCTELEM)]
267        movq    mm3, MMWORD [MMBLOCK(5,0,edx,SIZEOF_DCTELEM)]
268
269        ; mm6=(00 10 20 30), mm1=(40 50 60 70)
270        ; mm7=(01 11 21 31), mm3=(41 51 61 71)
271
272        movq    MMWORD [wk(0)], mm4     ; wk(0)=(22 23 32 33)
273        movq    MMWORD [wk(1)], mm2     ; wk(1)=(42 43 52 53)
274
275        movq      mm4,mm6               ; transpose coefficients(phase 1)
276        punpcklwd mm6,mm7               ; mm6=(00 01 10 11)
277        punpckhwd mm4,mm7               ; mm4=(20 21 30 31)
278        movq      mm2,mm1               ; transpose coefficients(phase 1)
279        punpcklwd mm1,mm3               ; mm1=(40 41 50 51)
280        punpckhwd mm2,mm3               ; mm2=(60 61 70 71)
281
282        movq      mm7,mm6               ; transpose coefficients(phase 2)
283        punpckldq mm6,mm0               ; mm6=(00 01 02 03)=data0
284        punpckhdq mm7,mm0               ; mm7=(10 11 12 13)=data1
285        movq      mm3,mm2               ; transpose coefficients(phase 2)
286        punpckldq mm2,mm5               ; mm2=(60 61 62 63)=data6
287        punpckhdq mm3,mm5               ; mm3=(70 71 72 73)=data7
288
289        movq    mm0,mm7
290        movq    mm5,mm6
291        psubw   mm7,mm2                 ; mm7=data1-data6=tmp6
292        psubw   mm6,mm3                 ; mm6=data0-data7=tmp7
293        paddw   mm0,mm2                 ; mm0=data1+data6=tmp1
294        paddw   mm5,mm3                 ; mm5=data0+data7=tmp0
295
296        movq    mm2, MMWORD [wk(0)]     ; mm2=(22 23 32 33)
297        movq    mm3, MMWORD [wk(1)]     ; mm3=(42 43 52 53)
298        movq    MMWORD [wk(0)], mm7     ; wk(0)=tmp6
299        movq    MMWORD [wk(1)], mm6     ; wk(1)=tmp7
300
301        movq      mm7,mm4               ; transpose coefficients(phase 2)
302        punpckldq mm4,mm2               ; mm4=(20 21 22 23)=data2
303        punpckhdq mm7,mm2               ; mm7=(30 31 32 33)=data3
304        movq      mm6,mm1               ; transpose coefficients(phase 2)
305        punpckldq mm1,mm3               ; mm1=(40 41 42 43)=data4
306        punpckhdq mm6,mm3               ; mm6=(50 51 52 53)=data5
307
308        movq    mm2,mm7
309        movq    mm3,mm4
310        paddw   mm7,mm1                 ; mm7=data3+data4=tmp3
311        paddw   mm4,mm6                 ; mm4=data2+data5=tmp2
312        psubw   mm2,mm1                 ; mm2=data3-data4=tmp4
313        psubw   mm3,mm6                 ; mm3=data2-data5=tmp5
314
315        ; -- Even part
316
317        movq    mm1,mm5
318        movq    mm6,mm0
319        psubw   mm5,mm7                 ; mm5=tmp13
320        psubw   mm0,mm4                 ; mm0=tmp12
321        paddw   mm1,mm7                 ; mm1=tmp10
322        paddw   mm6,mm4                 ; mm6=tmp11
323
324        paddw   mm0,mm5
325        psllw   mm0,PRE_MULTIPLY_SCALE_BITS
326        pmulhw  mm0,[GOTOFF(ebx,PW_F0707)] ; mm0=z1
327
328        movq    mm7,mm1
329        movq    mm4,mm5
330        psubw   mm1,mm6                 ; mm1=data4
331        psubw   mm5,mm0                 ; mm5=data6
332        paddw   mm7,mm6                 ; mm7=data0
333        paddw   mm4,mm0                 ; mm4=data2
334
335        movq    MMWORD [MMBLOCK(4,0,edx,SIZEOF_DCTELEM)], mm1
336        movq    MMWORD [MMBLOCK(6,0,edx,SIZEOF_DCTELEM)], mm5
337        movq    MMWORD [MMBLOCK(0,0,edx,SIZEOF_DCTELEM)], mm7
338        movq    MMWORD [MMBLOCK(2,0,edx,SIZEOF_DCTELEM)], mm4
339
340        ; -- Odd part
341
342        movq    mm6, MMWORD [wk(0)]     ; mm6=tmp6
343        movq    mm0, MMWORD [wk(1)]     ; mm0=tmp7
344
345        paddw   mm2,mm3                 ; mm2=tmp10
346        paddw   mm3,mm6                 ; mm3=tmp11
347        paddw   mm6,mm0                 ; mm6=tmp12, mm0=tmp7
348
349        psllw   mm2,PRE_MULTIPLY_SCALE_BITS
350        psllw   mm6,PRE_MULTIPLY_SCALE_BITS
351
352        psllw   mm3,PRE_MULTIPLY_SCALE_BITS
353        pmulhw  mm3,[GOTOFF(ebx,PW_F0707)] ; mm3=z3
354
355        movq    mm1,mm2                 ; mm1=tmp10
356        psubw   mm2,mm6
357        pmulhw  mm2,[GOTOFF(ebx,PW_F0382)] ; mm2=z5
358        pmulhw  mm1,[GOTOFF(ebx,PW_F0541)] ; mm1=MULTIPLY(tmp10,FIX_0_54119610)
359        pmulhw  mm6,[GOTOFF(ebx,PW_F1306)] ; mm6=MULTIPLY(tmp12,FIX_1_30656296)
360        paddw   mm1,mm2                 ; mm1=z2
361        paddw   mm6,mm2                 ; mm6=z4
362
363        movq    mm5,mm0
364        psubw   mm0,mm3                 ; mm0=z13
365        paddw   mm5,mm3                 ; mm5=z11
366
367        movq    mm7,mm0
368        movq    mm4,mm5
369        psubw   mm0,mm1                 ; mm0=data3
370        psubw   mm5,mm6                 ; mm5=data7
371        paddw   mm7,mm1                 ; mm7=data5
372        paddw   mm4,mm6                 ; mm4=data1
373
374        movq    MMWORD [MMBLOCK(3,0,edx,SIZEOF_DCTELEM)], mm0
375        movq    MMWORD [MMBLOCK(7,0,edx,SIZEOF_DCTELEM)], mm5
376        movq    MMWORD [MMBLOCK(5,0,edx,SIZEOF_DCTELEM)], mm7
377        movq    MMWORD [MMBLOCK(1,0,edx,SIZEOF_DCTELEM)], mm4
378
379        add     edx, byte 4*SIZEOF_DCTELEM
380        dec     ecx
381        jnz     near .columnloop
382
383        emms            ; empty MMX state
384
385;       pop     edi             ; unused
386;       pop     esi             ; unused
387;       pop     edx             ; need not be preserved
388;       pop     ecx             ; need not be preserved
389        poppic  ebx
390        mov     esp,ebp         ; esp <- aligned ebp
391        pop     esp             ; esp <- original ebp
392        pop     ebp
393        ret
394
395; For some reason, the OS X linker does not honor the request to align the
396; segment unless we do this.
397        align   16
398