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vorbisdsp_altivec.c
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1 /*
2  * Copyright (c) 2006 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 #if HAVE_ALTIVEC_H
23 #include <altivec.h>
24 #endif
25 #include "libavutil/attributes.h"
26 #include "libavutil/cpu.h"
27 #include "libavutil/ppc/cpu.h"
28 #include "libavcodec/vorbisdsp.h"
29 
30 #if HAVE_ALTIVEC
31 static void vorbis_inverse_coupling_altivec(float *mag, float *ang,
32  intptr_t blocksize)
33 {
34  int i;
35  vector float m, a;
36  vector bool int t0, t1;
37  const vector unsigned int v_31 = //XXX
38  vec_add(vec_add(vec_splat_u32(15),vec_splat_u32(15)),vec_splat_u32(1));
39  for (i = 0; i < blocksize; i += 4) {
40  m = vec_ld(0, mag+i);
41  a = vec_ld(0, ang+i);
42  t0 = vec_cmple(m, (vector float)vec_splat_u32(0));
43  t1 = vec_cmple(a, (vector float)vec_splat_u32(0));
44  a = vec_xor(a, (vector float) vec_sl((vector unsigned int)t0, v_31));
45  t0 = (vector bool int)vec_and(a, t1);
46  t1 = (vector bool int)vec_andc(a, t1);
47  a = vec_sub(m, (vector float)t1);
48  m = vec_add(m, (vector float)t0);
49  vec_stl(a, 0, ang+i);
50  vec_stl(m, 0, mag+i);
51  }
52 }
53 #endif /* HAVE_ALTIVEC */
54 
56 {
57 #if HAVE_ALTIVEC
59  return;
60 
61  c->vorbis_inverse_coupling = vorbis_inverse_coupling_altivec;
62 #endif /* HAVE_ALTIVEC */
63 }