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 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 
26 #include "config.h"
27 #if HAVE_ALTIVEC_H
28 #include <altivec.h>
29 #endif
30 
31 #include "libavcodec/dsputil.h"
32 
33 #include "dsputil_altivec.h"
34 
35 #include "types_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, int order, const int shift)
83 {
84  int i;
85  LOAD_ZERO;
86  register vec_s16 vec1, *pv;
87  register vec_s32 res = vec_splat_s32(0), t;
88  register vec_u32 shifts;
89  int32_t ires;
90 
91  shifts = zero_u32v;
92  if(shift & 0x10) shifts = vec_add(shifts, vec_sl(vec_splat_u32(0x08), vec_splat_u32(0x1)));
93  if(shift & 0x08) shifts = vec_add(shifts, vec_splat_u32(0x08));
94  if(shift & 0x04) shifts = vec_add(shifts, vec_splat_u32(0x04));
95  if(shift & 0x02) shifts = vec_add(shifts, vec_splat_u32(0x02));
96  if(shift & 0x01) shifts = vec_add(shifts, vec_splat_u32(0x01));
97 
98  for(i = 0; i < order; i += 8){
99  pv = (vec_s16*)v1;
100  vec1 = vec_perm(pv[0], pv[1], vec_lvsl(0, v1));
101  t = vec_msum(vec1, vec_ld(0, v2), zero_s32v);
102  t = vec_sr(t, shifts);
103  res = vec_sums(t, res);
104  v1 += 8;
105  v2 += 8;
106  }
107  res = vec_splat(res, 3);
108  vec_ste(res, 0, &ires);
109  return ires;
110 }
111 
112 static int32_t scalarproduct_and_madd_int16_altivec(int16_t *v1, const int16_t *v2, const int16_t *v3, int order, int mul)
113 {
114  LOAD_ZERO;
115  vec_s16 *pv1 = (vec_s16*)v1;
116  vec_s16 *pv2 = (vec_s16*)v2;
117  vec_s16 *pv3 = (vec_s16*)v3;
118  register vec_s16 muls = {mul,mul,mul,mul,mul,mul,mul,mul};
119  register vec_s16 t0, t1, i0, i1;
120  register vec_s16 i2 = pv2[0], i3 = pv3[0];
121  register vec_s32 res = zero_s32v;
122  register vec_u8 align = vec_lvsl(0, v2);
123  int32_t ires;
124  order >>= 4;
125  do {
126  t0 = vec_perm(i2, pv2[1], align);
127  i2 = pv2[2];
128  t1 = vec_perm(pv2[1], i2, align);
129  i0 = pv1[0];
130  i1 = pv1[1];
131  res = vec_msum(t0, i0, res);
132  res = vec_msum(t1, i1, res);
133  t0 = vec_perm(i3, pv3[1], align);
134  i3 = pv3[2];
135  t1 = vec_perm(pv3[1], i3, align);
136  pv1[0] = vec_mladd(t0, muls, i0);
137  pv1[1] = vec_mladd(t1, muls, i1);
138  pv1 += 2;
139  pv2 += 2;
140  pv3 += 2;
141  } while(--order);
142  res = vec_splat(vec_sums(res, zero_s32v), 3);
143  vec_ste(res, 0, &ires);
144  return ires;
145 }
146 
148 {
152 }