Statistics
| Branch: | Revision:

ffmpeg / libavcodec / i386 / fft_3dn2.c @ b550bfaa

History | View | Annotate | Download (6.9 KB)

1
/*
2
 * FFT/MDCT transform with Extended 3DNow! optimizations
3
 * Copyright (c) 2006 Zuxy MENG Jie, Loren Merritt
4
 * Based on fft_sse.c copyright (c) 2002 Fabrice Bellard.
5
 *
6
 * This file is part of FFmpeg.
7
 *
8
 * FFmpeg is free software; you can redistribute it and/or
9
 * modify it under the terms of the GNU Lesser General Public
10
 * License as published by the Free Software Foundation; either
11
 * version 2.1 of the License, or (at your option) any later version.
12
 *
13
 * FFmpeg is distributed in the hope that it will be useful,
14
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16
 * Lesser General Public License for more details.
17
 *
18
 * You should have received a copy of the GNU Lesser General Public
19
 * License along with FFmpeg; if not, write to the Free Software
20
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21
 */
22
#include "dsputil.h"
23

    
24
static const int p1m1[2] __attribute__((aligned(8))) =
25
    { 0, 1 << 31 };
26

    
27
static const int m1p1[2] __attribute__((aligned(8))) =
28
    { 1 << 31, 0 };
29

    
30
void ff_fft_calc_3dn2(FFTContext *s, FFTComplex *z)
31
{
32
    int ln = s->nbits;
33
    long i, j;
34
    long nblocks, nloops;
35
    FFTComplex *p, *cptr;
36

    
37
    asm volatile(
38
        /* FEMMS is not a must here but recommended by AMD */
39
        "femms \n\t"
40
        "movq %0, %%mm7 \n\t"
41
        ::"m"(*(s->inverse ? m1p1 : p1m1))
42
    );
43

    
44
    i = 8 << ln;
45
    asm volatile(
46
        "1: \n\t"
47
        "sub $32, %0 \n\t"
48
        "movq    (%0,%1), %%mm0 \n\t"
49
        "movq  16(%0,%1), %%mm1 \n\t"
50
        "movq   8(%0,%1), %%mm2 \n\t"
51
        "movq  24(%0,%1), %%mm3 \n\t"
52
        "movq      %%mm0, %%mm4 \n\t"
53
        "movq      %%mm1, %%mm5 \n\t"
54
        "pfadd     %%mm2, %%mm0 \n\t"
55
        "pfadd     %%mm3, %%mm1 \n\t"
56
        "pfsub     %%mm2, %%mm4 \n\t"
57
        "pfsub     %%mm3, %%mm5 \n\t"
58
        "movq      %%mm0, %%mm2 \n\t"
59
        "pswapd    %%mm5, %%mm5 \n\t"
60
        "movq      %%mm4, %%mm3 \n\t"
61
        "pxor      %%mm7, %%mm5 \n\t"
62
        "pfadd     %%mm1, %%mm0 \n\t"
63
        "pfadd     %%mm5, %%mm4 \n\t"
64
        "pfsub     %%mm1, %%mm2 \n\t"
65
        "pfsub     %%mm5, %%mm3 \n\t"
66
        "movq      %%mm0,   (%0,%1) \n\t"
67
        "movq      %%mm4,  8(%0,%1) \n\t"
68
        "movq      %%mm2, 16(%0,%1) \n\t"
69
        "movq      %%mm3, 24(%0,%1) \n\t"
70
        "jg 1b \n\t"
71
        :"+r"(i)
72
        :"r"(z)
73
    );
74
    /* pass 2 .. ln-1 */
75

    
76
    nblocks = 1 << (ln-3);
77
    nloops = 1 << 2;
78
    cptr = s->exptab1;
79
    do {
80
        p = z;
81
        j = nblocks;
82
        do {
83
            i = nloops*8;
84
            asm volatile(
85
                "1: \n\t"
86
                "sub $16, %0 \n\t"
87
                "movq    (%1,%0), %%mm0 \n\t"
88
                "movq   8(%1,%0), %%mm1 \n\t"
89
                "movq    (%2,%0), %%mm2 \n\t"
90
                "movq   8(%2,%0), %%mm3 \n\t"
91
                "movq  (%3,%0,2), %%mm4 \n\t"
92
                "movq 8(%3,%0,2), %%mm5 \n\t"
93
                "pswapd    %%mm4, %%mm6 \n\t" // no need for cptr[2] & cptr[3]
94
                "pswapd    %%mm5, %%mm7 \n\t"
95
                "pfmul     %%mm2, %%mm4 \n\t" // cre*re cim*im
96
                "pfmul     %%mm3, %%mm5 \n\t"
97
                "pfmul     %%mm2, %%mm6 \n\t" // cim*re cre*im
98
                "pfmul     %%mm3, %%mm7 \n\t"
99
                "pfpnacc   %%mm6, %%mm4 \n\t" // cre*re-cim*im cim*re+cre*im
100
                "pfpnacc   %%mm7, %%mm5 \n\t"
101
                "movq      %%mm0, %%mm2 \n\t"
102
                "movq      %%mm1, %%mm3 \n\t"
103
                "pfadd     %%mm4, %%mm0 \n\t"
104
                "pfadd     %%mm5, %%mm1 \n\t"
105
                "pfsub     %%mm4, %%mm2 \n\t"
106
                "pfsub     %%mm5, %%mm3 \n\t"
107
                "movq      %%mm0,  (%1,%0) \n\t"
108
                "movq      %%mm1, 8(%1,%0) \n\t"
109
                "movq      %%mm2,  (%2,%0) \n\t"
110
                "movq      %%mm3, 8(%2,%0) \n\t"
111
                "jg 1b \n\t"
112
                :"+r"(i)
113
                :"r"(p), "r"(p + nloops), "r"(cptr)
114
            );
115
            p += nloops*2;
116
        } while (--j);
117
        cptr += nloops*2;
118
        nblocks >>= 1;
119
        nloops <<= 1;
120
    } while (nblocks != 0);
121
    asm volatile("femms");
122
}
123

    
124
void ff_imdct_calc_3dn2(MDCTContext *s, FFTSample *output,
125
                        const FFTSample *input, FFTSample *tmp)
126
{
127
    long k, n8, n4, n2, n;
128
    const uint16_t *revtab = s->fft.revtab;
129
    const FFTSample *tcos = s->tcos;
130
    const FFTSample *tsin = s->tsin;
131
    const FFTSample *in1, *in2;
132
    FFTComplex *z = (FFTComplex *)tmp;
133

    
134
    n = 1 << s->nbits;
135
    n2 = n >> 1;
136
    n4 = n >> 2;
137
    n8 = n >> 3;
138

    
139
    /* pre rotation */
140
    in1 = input;
141
    in2 = input + n2 - 1;
142
    for(k = 0; k < n4; k++) {
143
        // FIXME a single block is faster, but gcc 2.95 and 3.4.x on 32bit can't compile it
144
        asm volatile(
145
            "movd       %0, %%mm0 \n\t"
146
            "movd       %2, %%mm1 \n\t"
147
            "punpckldq  %1, %%mm0 \n\t"
148
            "punpckldq  %3, %%mm1 \n\t"
149
            "movq    %%mm0, %%mm2 \n\t"
150
            "pfmul   %%mm1, %%mm0 \n\t"
151
            "pswapd  %%mm1, %%mm1 \n\t"
152
            "pfmul   %%mm1, %%mm2 \n\t"
153
            "pfpnacc %%mm2, %%mm0 \n\t"
154
            ::"m"(in2[-2*k]), "m"(in1[2*k]),
155
              "m"(tcos[k]), "m"(tsin[k])
156
        );
157
        asm volatile(
158
            "movq    %%mm0, %0    \n\t"
159
            :"=m"(z[revtab[k]])
160
        );
161
    }
162

    
163
    ff_fft_calc(&s->fft, z);
164

    
165
    /* post rotation + reordering */
166
    for(k = 0; k < n4; k++) {
167
        asm volatile(
168
            "movq       %0, %%mm0 \n\t"
169
            "movd       %1, %%mm1 \n\t"
170
            "punpckldq  %2, %%mm1 \n\t"
171
            "movq    %%mm0, %%mm2 \n\t"
172
            "pfmul   %%mm1, %%mm0 \n\t"
173
            "pswapd  %%mm1, %%mm1 \n\t"
174
            "pfmul   %%mm1, %%mm2 \n\t"
175
            "pfpnacc %%mm2, %%mm0 \n\t"
176
            "movq    %%mm0, %0    \n\t"
177
            :"+m"(z[k])
178
            :"m"(tcos[k]), "m"(tsin[k])
179
        );
180
    }
181

    
182
    k = n-8;
183
    asm volatile("movd %0, %%mm7" ::"r"(1<<31));
184
    asm volatile(
185
        "1: \n\t"
186
        "movq    (%4,%0), %%mm0 \n\t" // z[n8+k]
187
        "neg %0 \n\t"
188
        "pswapd -8(%4,%0), %%mm1 \n\t" // z[n8-1-k]
189
        "movq      %%mm0, %%mm2 \n\t"
190
        "pxor      %%mm7, %%mm2 \n\t"
191
        "punpckldq %%mm1, %%mm2 \n\t"
192
        "pswapd    %%mm2, %%mm3 \n\t"
193
        "punpckhdq %%mm1, %%mm0 \n\t"
194
        "pswapd    %%mm0, %%mm4 \n\t"
195
        "pxor      %%mm7, %%mm0 \n\t"
196
        "pxor      %%mm7, %%mm4 \n\t"
197
        "movq      %%mm3, -8(%3,%0) \n\t" // output[n-2-2*k] = { z[n8-1-k].im, -z[n8+k].re }
198
        "movq      %%mm4, -8(%2,%0) \n\t" // output[n2-2-2*k]= { -z[n8-1-k].re, z[n8+k].im }
199
        "neg %0 \n\t"
200
        "movq      %%mm0, (%1,%0) \n\t"   // output[2*k]     = { -z[n8+k].im, z[n8-1-k].re }
201
        "movq      %%mm2, (%2,%0) \n\t"   // output[n2+2*k]  = { -z[n8+k].re, z[n8-1-k].im }
202
        "sub $8, %0 \n\t"
203
        "jge 1b \n\t"
204
        :"+r"(k)
205
        :"r"(output), "r"(output+n2), "r"(output+n), "r"(z+n8)
206
        :"memory"
207
    );
208
    asm volatile("femms");
209
}
210