float_dsp_altivec.c
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1 /*
2  * Copyright (c) 2006 Luca Barbato <lu_zero@gentoo.org>
3  *
4  * This file is part of Libav.
5  *
6  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include "util_altivec.h"
22 #include "float_dsp_altivec.h"
23 
24 void ff_vector_fmul_altivec(float *dst, const float *src0, const float *src1,
25  int len)
26 {
27  int i;
28  vector float d0, d1, s, zero = (vector float)vec_splat_u32(0);
29  for (i = 0; i < len - 7; i += 8) {
30  d0 = vec_ld( 0, src0 + i);
31  s = vec_ld( 0, src1 + i);
32  d1 = vec_ld(16, src0 + i);
33  d0 = vec_madd(d0, s, zero);
34  d1 = vec_madd(d1, vec_ld(16, src1 + i), zero);
35  vec_st(d0, 0, dst + i);
36  vec_st(d1, 16, dst + i);
37  }
38 }
39 
40 void ff_vector_fmul_window_altivec(float *dst, const float *src0,
41  const float *src1, const float *win, int len)
42 {
43  vector float zero, t0, t1, s0, s1, wi, wj;
44  const vector unsigned char reverse = vcprm(3, 2, 1, 0);
45  int i, j;
46 
47  dst += len;
48  win += len;
49  src0 += len;
50 
51  zero = (vector float)vec_splat_u32(0);
52 
53  for (i = -len * 4, j = len * 4 - 16; i < 0; i += 16, j -= 16) {
54  s0 = vec_ld(i, src0);
55  s1 = vec_ld(j, src1);
56  wi = vec_ld(i, win);
57  wj = vec_ld(j, win);
58 
59  s1 = vec_perm(s1, s1, reverse);
60  wj = vec_perm(wj, wj, reverse);
61 
62  t0 = vec_madd(s0, wj, zero);
63  t0 = vec_nmsub(s1, wi, t0);
64  t1 = vec_madd(s0, wi, zero);
65  t1 = vec_madd(s1, wj, t1);
66  t1 = vec_perm(t1, t1, reverse);
67 
68  vec_st(t0, i, dst);
69  vec_st(t1, j, dst);
70  }
71 }