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int_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 /**
22  ** @file
23  ** integer misc ops.
24  **/
25 
26 #include "config.h"
27 #if HAVE_ALTIVEC_H
28 #include <altivec.h>
29 #endif
30 
31 #include "libavutil/attributes.h"
33 #include "libavcodec/dsputil.h"
34 
35 #include "dsputil_altivec.h"
36 
37 static int ssd_int8_vs_int16_altivec(const int8_t *pix1, const int16_t *pix2,
38  int size) {
39  int i, size16;
40  vector signed char vpix1;
41  vector signed short vpix2, vdiff, vpix1l,vpix1h;
42  union { vector signed int vscore;
43  int32_t score[4];
44  } u;
45  u.vscore = vec_splat_s32(0);
46 //
47 //XXX lazy way, fix it later
48 
49 #define vec_unaligned_load(b) \
50  vec_perm(vec_ld(0,b),vec_ld(15,b),vec_lvsl(0, b));
51 
52  size16 = size >> 4;
53  while(size16) {
54 // score += (pix1[i]-pix2[i])*(pix1[i]-pix2[i]);
55  //load pix1 and the first batch of pix2
56 
57  vpix1 = vec_unaligned_load(pix1);
58  vpix2 = vec_unaligned_load(pix2);
59  pix2 += 8;
60  //unpack
61  vpix1h = vec_unpackh(vpix1);
62  vdiff = vec_sub(vpix1h, vpix2);
63  vpix1l = vec_unpackl(vpix1);
64  // load another batch from pix2
65  vpix2 = vec_unaligned_load(pix2);
66  u.vscore = vec_msum(vdiff, vdiff, u.vscore);
67  vdiff = vec_sub(vpix1l, vpix2);
68  u.vscore = vec_msum(vdiff, vdiff, u.vscore);
69  pix1 += 16;
70  pix2 += 8;
71  size16--;
72  }
73  u.vscore = vec_sums(u.vscore, vec_splat_s32(0));
74 
75  size %= 16;
76  for (i = 0; i < size; i++) {
77  u.score[3] += (pix1[i]-pix2[i])*(pix1[i]-pix2[i]);
78  }
79  return u.score[3];
80 }
81 
82 static int32_t scalarproduct_int16_altivec(const int16_t *v1, const int16_t *v2,
83  int order)
84 {
85  int i;
86  LOAD_ZERO;
87  const vec_s16 *pv;
88  register vec_s16 vec1;
89  register vec_s32 res = vec_splat_s32(0), t;
90  int32_t ires;
91 
92  for(i = 0; i < order; i += 8){
93  pv = (const vec_s16*)v1;
94  vec1 = vec_perm(pv[0], pv[1], vec_lvsl(0, v1));
95  t = vec_msum(vec1, vec_ld(0, v2), zero_s32v);
96  res = vec_sums(t, res);
97  v1 += 8;
98  v2 += 8;
99  }
100  res = vec_splat(res, 3);
101  vec_ste(res, 0, &ires);
102  return ires;
103 }
104 
105 static int32_t scalarproduct_and_madd_int16_altivec(int16_t *v1, const int16_t *v2, const int16_t *v3, int order, int mul)
106 {
107  LOAD_ZERO;
108  vec_s16 *pv1 = (vec_s16*)v1;
109  register vec_s16 muls = {mul,mul,mul,mul,mul,mul,mul,mul};
110  register vec_s16 t0, t1, i0, i1, i4;
111  register vec_s16 i2 = vec_ld(0, v2), i3 = vec_ld(0, v3);
112  register vec_s32 res = zero_s32v;
113  register vec_u8 align = vec_lvsl(0, v2);
114  int32_t ires;
115  order >>= 4;
116  do {
117  i1 = vec_ld(16, v2);
118  t0 = vec_perm(i2, i1, align);
119  i2 = vec_ld(32, v2);
120  t1 = vec_perm(i1, i2, align);
121  i0 = pv1[0];
122  i1 = pv1[1];
123  res = vec_msum(t0, i0, res);
124  res = vec_msum(t1, i1, res);
125  i4 = vec_ld(16, v3);
126  t0 = vec_perm(i3, i4, align);
127  i3 = vec_ld(32, v3);
128  t1 = vec_perm(i4, i3, align);
129  pv1[0] = vec_mladd(t0, muls, i0);
130  pv1[1] = vec_mladd(t1, muls, i1);
131  pv1 += 2;
132  v2 += 8;
133  v3 += 8;
134  } while(--order);
135  res = vec_splat(vec_sums(res, zero_s32v), 3);
136  vec_ste(res, 0, &ires);
137  return ires;
138 }
139 
141 {
145 }