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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 "config.h"
22 
23 #include <stdint.h>
24 
25 #include "libavutil/attributes.h"
26 #include "libavutil/cpu.h"
27 #include "libavutil/ppc/cpu.h"
29 
30 #include "libavcodec/svq1enc.h"
31 
32 #if HAVE_ALTIVEC
33 static int ssd_int8_vs_int16_altivec(const int8_t *pix1, const int16_t *pix2,
34  intptr_t size)
35 {
36  int i, size16 = size >> 4;
37  vector signed char vpix1;
38  vector signed short vpix2, vdiff, vpix1l, vpix1h;
39  union {
40  vector signed int vscore;
41  int32_t score[4];
42  } u = { .vscore = vec_splat_s32(0) };
43 
44  while (size16) {
45  // score += (pix1[i] - pix2[i]) * (pix1[i] - pix2[i]);
46  // load pix1 and the first batch of pix2
47 
48  vpix1 = vec_unaligned_load(pix1);
49  vpix2 = vec_unaligned_load(pix2);
50  pix2 += 8;
51  // unpack
52  vpix1h = vec_unpackh(vpix1);
53  vdiff = vec_sub(vpix1h, vpix2);
54  vpix1l = vec_unpackl(vpix1);
55  // load another batch from pix2
56  vpix2 = vec_unaligned_load(pix2);
57  u.vscore = vec_msum(vdiff, vdiff, u.vscore);
58  vdiff = vec_sub(vpix1l, vpix2);
59  u.vscore = vec_msum(vdiff, vdiff, u.vscore);
60  pix1 += 16;
61  pix2 += 8;
62  size16--;
63  }
64  u.vscore = vec_sums(u.vscore, vec_splat_s32(0));
65 
66  size %= 16;
67  for (i = 0; i < size; i++)
68  u.score[3] += (pix1[i] - pix2[i]) * (pix1[i] - pix2[i]);
69 
70  return u.score[3];
71 }
72 #endif /* HAVE_ALTIVEC */
73 
75 {
76 #if HAVE_ALTIVEC
78  return;
79 
80  c->ssd_int8_vs_int16 = ssd_int8_vs_int16_altivec;
81 #endif /* HAVE_ALTIVEC */
82 }
Macro definitions for various function/variable attributes.
#define av_cold
Definition: attributes.h:82
#define u(width, name, range_min, range_max)
Definition: cbs_h2645.c:343
ptrdiff_t size
Definition: opengl_enc.c:101
#define PPC_ALTIVEC(flags)
Definition: cpu.h:26
int32_t
int(* ssd_int8_vs_int16)(const int8_t *pix1, const int16_t *pix2, intptr_t size)
Definition: svq1enc.h:78
av_cold void ff_svq1enc_init_ppc(SVQ1EncContext *c)
int av_get_cpu_flags(void)
Return the flags which specify extensions supported by the CPU.
Definition: cpu.c:92
Contains misc utility macros and inline functions.
static double c[64]