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svq1enc_altivec.c
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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 #include <stdint.h>
22 
23 #include "config.h"
24 #if HAVE_ALTIVEC_H
25 #include <altivec.h>
26 #endif
27 
28 #include "libavutil/attributes.h"
29 #include "libavutil/cpu.h"
30 #include "libavutil/ppc/cpu.h"
33 #include "libavcodec/svq1enc.h"
34 
35 #if HAVE_ALTIVEC
36 static int ssd_int8_vs_int16_altivec(const int8_t *pix1, const int16_t *pix2,
37  int size)
38 {
39  int i, size16 = size >> 4;
40  vector signed char vpix1;
41  vector signed short vpix2, vdiff, vpix1l, vpix1h;
42  union {
43  vector signed int vscore;
44  int32_t score[4];
45  } u = { .vscore = vec_splat_s32(0) };
46 
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 #endif /* HAVE_ALTIVEC */
76 
78 {
79 #if HAVE_ALTIVEC
81  return;
82 
83  c->ssd_int8_vs_int16 = ssd_int8_vs_int16_altivec;
84 #endif /* HAVE_ALTIVEC */
85 }