libavcodec/ppc/float_altivec.c

   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 "libavcodec/dsputil.h"
  22
  23 #include "gcc_fixes.h"
  24
  25 #include "dsputil_altivec.h"
  26
  27 static void vector_fmul_altivec(float *dst, const float *src, int len)
  28 {
  29     int i;
  30     vector float d0, d1, s, zero = (vector float)vec_splat_u32(0);
  31     for(i=0; i<len-7; i+=8) {
  32         d0 = vec_ld(0, dst+i);
  33         s = vec_ld(0, src+i);
  34         d1 = vec_ld(16, dst+i);
  35         d0 = vec_madd(d0, s, zero);
  36         d1 = vec_madd(d1, vec_ld(16,src+i), zero);
  37         vec_st(d0, 0, dst+i);
  38         vec_st(d1, 16, dst+i);
  39     }
  40 }
  41
  42 static void vector_fmul_reverse_altivec(float *dst, const float *src0,
  43                                         const float *src1, int len)
  44 {
  45     int i;
  46     vector float d, s0, s1, h0, l0,
  47                  s2, s3, zero = (vector float)vec_splat_u32(0);
  48     src1 += len-4;
  49     for(i=0; i<len-7; i+=8) {
  50         s1 = vec_ld(0, src1-i);              // [a,b,c,d]
  51         s0 = vec_ld(0, src0+i);
  52         l0 = vec_mergel(s1, s1);             // [c,c,d,d]
  53         s3 = vec_ld(-16, src1-i);
  54         h0 = vec_mergeh(s1, s1);             // [a,a,b,b]
  55         s2 = vec_ld(16, src0+i);
  56         s1 = vec_mergeh(vec_mergel(l0,h0),   // [d,b,d,b]
  57                         vec_mergeh(l0,h0));  // [c,a,c,a]
  58                                              // [d,c,b,a]
  59         l0 = vec_mergel(s3, s3);
  60         d = vec_madd(s0, s1, zero);
  61         h0 = vec_mergeh(s3, s3);
  62         vec_st(d, 0, dst+i);
  63         s3 = vec_mergeh(vec_mergel(l0,h0),
  64                         vec_mergeh(l0,h0));
  65         d = vec_madd(s2, s3, zero);
  66         vec_st(d, 16, dst+i);
  67     }
  68 }
  69
  70 static void vector_fmul_add_add_altivec(float *dst, const float *src0,
  71                                         const float *src1, const float *src2,
  72                                         int src3, int len, int step)
  73 {
  74     int i;
  75     vector float d, s0, s1, s2, t0, t1, edges;
  76     vector unsigned char align = vec_lvsr(0,dst),
  77                          mask = vec_lvsl(0, dst);
  78
  79 #if 0 //FIXME: there is still something wrong
  80     if (step == 2) {
  81         int y;
  82         vector float d0, d1, s3, t2;
  83         vector unsigned int sel =
  84                 vec_mergeh(vec_splat_u32(-1), vec_splat_u32(0));
  85         t1 = vec_ld(16, dst);
  86         for (i=0,y=0; i<len-3; i+=4,y+=8) {
  87
  88             s0 = vec_ld(0,src0+i);
  89             s1 = vec_ld(0,src1+i);
  90             s2 = vec_ld(0,src2+i);
  91
  92 //          t0 = vec_ld(0, dst+y);  //[x x x|a]
  93 //          t1 = vec_ld(16, dst+y); //[b c d|e]
  94             t2 = vec_ld(31, dst+y); //[f g h|x]
  95
  96             d = vec_madd(s0,s1,s2); // [A B C D]
  97
  98                                                  // [A A B B]
  99
 100                                                  // [C C D D]
 101
 102             d0 = vec_perm(t0, t1, mask); // [a b c d]
 103
 104             d0 = vec_sel(vec_mergeh(d, d), d0, sel);   // [A b B d]
 105
 106             edges = vec_perm(t1, t0, mask);
 107
 108             t0 = vec_perm(edges, d0, align); // [x x x|A]
 109
 110             t1 = vec_perm(d0, edges, align); // [b B d|e]
 111
 112             vec_stl(t0, 0, dst+y);
 113
 114             d1 = vec_perm(t1, t2, mask); // [e f g h]
 115
 116             d1 = vec_sel(vec_mergel(d, d), d1, sel); // [C f D h]
 117
 118             edges = vec_perm(t2, t1, mask);
 119
 120             t1 = vec_perm(edges, d1, align); // [b B d|C]
 121
 122             t2 = vec_perm(d1, edges, align); // [f D h|x]
 123
 124             vec_stl(t1, 16, dst+y);
 125
 126             t0 = t1;
 127
 128             vec_stl(t2, 31, dst+y);
 129
 130             t1 = t2;
 131         }
 132     } else
 133     #endif
 134     if (step == 1 && src3 == 0)
 135         for (i=0; i<len-3; i+=4) {
 136             t0 = vec_ld(0, dst+i);
 137             t1 = vec_ld(15, dst+i);
 138             s0 = vec_ld(0, src0+i);
 139             s1 = vec_ld(0, src1+i);
 140             s2 = vec_ld(0, src2+i);
 141             edges = vec_perm(t1 ,t0, mask);
 142             d = vec_madd(s0,s1,s2);
 143             t1 = vec_perm(d, edges, align);
 144             t0 = vec_perm(edges, d, align);
 145             vec_st(t1, 15, dst+i);
 146             vec_st(t0, 0, dst+i);
 147         }
 148     else
 149         ff_vector_fmul_add_add_c(dst, src0, src1, src2, src3, len, step);
 150 }
 151
 152 void float_to_int16_altivec(int16_t *dst, const float *src, int len)
 153 {
 154     int i;
 155     vector float s0, s1;
 156     vector signed int t0, t1;
 157     vector signed short d0, d1, d;
 158     vector unsigned char align;
 159     if(((long)dst)&15) //FIXME
 160     for(i=0; i<len-7; i+=8) {
 161         s0 = vec_ld(0, src+i);
 162         s1 = vec_ld(16, src+i);
 163         t0 = vec_cts(s0, 0);
 164         d0 = vec_ld(0, dst+i);
 165         t1 = vec_cts(s1, 0);
 166         d1 = vec_ld(15, dst+i);
 167         d = vec_packs(t0,t1);
 168         d1 = vec_perm(d1, d0, vec_lvsl(0,dst+i));
 169         align = vec_lvsr(0, dst+i);
 170         d0 = vec_perm(d1, d, align);
 171         d1 = vec_perm(d, d1, align);
 172         vec_st(d0, 0, dst+i);
 173         vec_st(d1,15, dst+i);
 174     }
 175     else
 176     for(i=0; i<len-7; i+=8) {
 177         s0 = vec_ld(0, src+i);
 178         s1 = vec_ld(16, src+i);
 179         t0 = vec_cts(s0, 0);
 180         t1 = vec_cts(s1, 0);
 181         d = vec_packs(t0,t1);
 182         vec_st(d, 0, dst+i);
 183     }
 184 }
 185
 186 void float_init_altivec(DSPContext* c, AVCodecContext *avctx)
 187 {
 188     c->vector_fmul = vector_fmul_altivec;
 189     c->vector_fmul_reverse = vector_fmul_reverse_altivec;
 190     c->vector_fmul_add_add = vector_fmul_add_add_altivec;
 191     if(!(avctx->flags & CODEC_FLAG_BITEXACT))
 192         c->float_to_int16 = float_to_int16_altivec;
 193 }