libavcodec/ppc/int_altivec.c

   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 int_altivec.c
  23  ** integer misc ops.
  24  **/
  25
  26 #include "libavcodec/dsputil.h"
  27
  28 #include "gcc_fixes.h"
  29
  30 #include "dsputil_altivec.h"
  31
  32 #include "types_altivec.h"
  33
  34 static int ssd_int8_vs_int16_altivec(const int8_t *pix1, const int16_t *pix2,
  35                                      int size) {
  36     int i, size16;
  37     vector signed char vpix1;
  38     vector signed short vpix2, vdiff, vpix1l,vpix1h;
  39     union { vector signed int vscore;
  40             int32_t score[4];
  41           } u;
  42     u.vscore = vec_splat_s32(0);
  43 //
  44 //XXX lazy way, fix it later
  45
  46 #define vec_unaligned_load(b) \
  47     vec_perm(vec_ld(0,b),vec_ld(15,b),vec_lvsl(0, b));
  48
  49     size16 = size >> 4;
  50     while(size16) {
  51 //        score += (pix1[i]-pix2[i])*(pix1[i]-pix2[i]);
  52         //load pix1 and the first batch of pix2
  53
  54         vpix1 = vec_unaligned_load(pix1);
  55         vpix2 = vec_unaligned_load(pix2);
  56         pix2 += 8;
  57         //unpack
  58         vpix1h = vec_unpackh(vpix1);
  59         vdiff  = vec_sub(vpix1h, vpix2);
  60         vpix1l = vec_unpackl(vpix1);
  61         // load another batch from pix2
  62         vpix2 = vec_unaligned_load(pix2);
  63         u.vscore = vec_msum(vdiff, vdiff, u.vscore);
  64         vdiff  = vec_sub(vpix1l, vpix2);
  65         u.vscore = vec_msum(vdiff, vdiff, u.vscore);
  66         pix1 += 16;
  67         pix2 += 8;
  68         size16--;
  69     }
  70     u.vscore = vec_sums(u.vscore, vec_splat_s32(0));
  71
  72     size %= 16;
  73     for (i = 0; i < size; i++) {
  74         u.score[3] += (pix1[i]-pix2[i])*(pix1[i]-pix2[i]);
  75     }
  76     return u.score[3];
  77 }
  78
  79 static void add_int16_altivec(int16_t * v1, int16_t * v2, int order)
  80 {
  81     int i;
  82     register vec_s16_t vec, *pv;
  83
  84     for(i = 0; i < order; i += 8){
  85         pv = (vec_s16_t*)v2;
  86         vec = vec_perm(pv[0], pv[1], vec_lvsl(0, v2));
  87         vec_st(vec_add(vec_ld(0, v1), vec), 0, v1);
  88         v1 += 8;
  89         v2 += 8;
  90     }
  91 }
  92
  93 static void sub_int16_altivec(int16_t * v1, int16_t * v2, int order)
  94 {
  95     int i;
  96     register vec_s16_t vec, *pv;
  97
  98     for(i = 0; i < order; i += 8){
  99         pv = (vec_s16_t*)v2;
 100         vec = vec_perm(pv[0], pv[1], vec_lvsl(0, v2));
 101         vec_st(vec_sub(vec_ld(0, v1), vec), 0, v1);
 102         v1 += 8;
 103         v2 += 8;
 104     }
 105 }
 106
 107 static int32_t scalarproduct_int16_altivec(int16_t * v1, int16_t * v2, int order, const int shift)
 108 {
 109     int i;
 110     LOAD_ZERO;
 111     register vec_s16_t vec1, *pv;
 112     register vec_s32_t res = vec_splat_s32(0), t;
 113     register vec_u32_t shifts;
 114     DECLARE_ALIGNED_16(int32_t, ires);
 115
 116     shifts = zero_u32v;
 117     if(shift & 0x10) shifts = vec_add(shifts, vec_sl(vec_splat_u32(0x08), vec_splat_u32(0x1)));
 118     if(shift & 0x08) shifts = vec_add(shifts, vec_splat_u32(0x08));
 119     if(shift & 0x04) shifts = vec_add(shifts, vec_splat_u32(0x04));
 120     if(shift & 0x02) shifts = vec_add(shifts, vec_splat_u32(0x02));
 121     if(shift & 0x01) shifts = vec_add(shifts, vec_splat_u32(0x01));
 122
 123     for(i = 0; i < order; i += 8){
 124         pv = (vec_s16_t*)v1;
 125         vec1 = vec_perm(pv[0], pv[1], vec_lvsl(0, v1));
 126         t = vec_msum(vec1, vec_ld(0, v2), zero_s32v);
 127         t = vec_sr(t, shifts);
 128         res = vec_sums(t, res);
 129         v1 += 8;
 130         v2 += 8;
 131     }
 132     res = vec_splat(res, 3);
 133     vec_ste(res, 0, &ires);
 134     return ires;
 135 }
 136
 137 void int_init_altivec(DSPContext* c, AVCodecContext *avctx)
 138 {
 139     c->ssd_int8_vs_int16 = ssd_int8_vs_int16_altivec;
 140     c->add_int16 = add_int16_altivec;
 141     c->sub_int16 = sub_int16_altivec;
 142     c->scalarproduct_int16 = scalarproduct_int16_altivec;
 143 }