Statistics
| Branch: | Revision:

ffmpeg / libavcodec / ppc / int_altivec.c @ b550bfaa

History | View | Annotate | Download (2.31 KB)

1
/*
2
 * Copyright (c) 2007 Luca Barbato <lu_zero@gentoo.org>
3
 *
4
 * This file is part of FFmpeg.
5
 *
6
 * FFmpeg is free software; you can redistribute it and/or
7
 * modify it under the terms of the GNU Lesser General Public
8
 * License as published by the Free Software Foundation; either
9
 * version 2.1 of the License, or (at your option) any later version.
10
 *
11
 * FFmpeg is distributed in the hope that it will be useful,
12
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14
 * Lesser General Public License for more details.
15
 *
16
 * You should have received a copy of the GNU Lesser General Public
17
 * License along with FFmpeg; if not, write to the Free Software
18
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19
 */
20

    
21
/**
22
 ** @file int_altivec.c
23
 ** integer misc ops.
24
 **/
25

    
26
#include "dsputil.h"
27

    
28
#include "gcc_fixes.h"
29

    
30
#include "dsputil_altivec.h"
31

    
32
static int ssd_int8_vs_int16_altivec(int8_t *pix1, int16_t *pix2, int size) {
33
    int i, size16;
34
    vector signed char vpix1;
35
    vector signed short vpix2, vdiff, vpix1l,vpix1h;
36
    union { vector signed int vscore;
37
            int32_t score[4];
38
           } u;
39
    u.vscore = vec_splat_s32(0);
40
//
41
//XXX lazy way, fix it later
42

    
43
#define vec_unaligned_load(b) \
44
    vec_perm(vec_ld(0,b),vec_ld(15,b),vec_lvsl(0, b));
45

    
46
    size16 = size >> 4;
47
    while(size16) {
48
//        score += (pix1[i]-pix2[i])*(pix1[i]-pix2[i]);
49
        //load pix1 and the first batch of pix2
50

    
51
        vpix1 = vec_unaligned_load(pix1);
52
        vpix2 = vec_unaligned_load(pix2);
53
        pix2 += 8;
54
        //unpack
55
        vpix1h = vec_unpackh(vpix1);
56
        vdiff  = vec_sub(vpix1h, vpix2);
57
        vpix1l = vec_unpackl(vpix1);
58
        // load another batch from pix2
59
        vpix2 = vec_unaligned_load(pix2);
60
        u.vscore = vec_msum(vdiff, vdiff, u.vscore);
61
        vdiff  = vec_sub(vpix1l, vpix2);
62
        u.vscore = vec_msum(vdiff, vdiff, u.vscore);
63
        pix1 += 16;
64
        pix2 += 8;
65
        size16--;
66
    }
67
    u.vscore = vec_sums(u.vscore, vec_splat_s32(0));
68

    
69
    size %= 16;
70
    for (i = 0; i < size; i++) {
71
        u.score[3] += (pix1[i]-pix2[i])*(pix1[i]-pix2[i]);
72
    }
73
    return u.score[3];
74
}
75

    
76
void int_init_altivec(DSPContext* c, AVCodecContext *avctx)
77
{
78
    c->ssd_int8_vs_int16 = ssd_int8_vs_int16_altivec;
79
}