Libav 0.7.1
libavcodec/ppc/float_altivec.c
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00001 /*
00002  * Copyright (c) 2006 Luca Barbato <lu_zero@gentoo.org>
00003  *
00004  * This file is part of Libav.
00005  *
00006  * Libav is free software; you can redistribute it and/or
00007  * modify it under the terms of the GNU Lesser General Public
00008  * License as published by the Free Software Foundation; either
00009  * version 2.1 of the License, or (at your option) any later version.
00010  *
00011  * Libav is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014  * Lesser General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU Lesser General Public
00017  * License along with Libav; if not, write to the Free Software
00018  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00019  */
00020 
00021 #include "libavcodec/dsputil.h"
00022 
00023 #include "dsputil_altivec.h"
00024 #include "util_altivec.h"
00025 
00026 static void vector_fmul_altivec(float *dst, const float *src0, const float *src1, int len)
00027 {
00028     int i;
00029     vector float d0, d1, s, zero = (vector float)vec_splat_u32(0);
00030     for(i=0; i<len-7; i+=8) {
00031         d0 = vec_ld(0, src0+i);
00032         s = vec_ld(0, src1+i);
00033         d1 = vec_ld(16, src0+i);
00034         d0 = vec_madd(d0, s, zero);
00035         d1 = vec_madd(d1, vec_ld(16,src1+i), zero);
00036         vec_st(d0, 0, dst+i);
00037         vec_st(d1, 16, dst+i);
00038     }
00039 }
00040 
00041 static void vector_fmul_reverse_altivec(float *dst, const float *src0,
00042                                         const float *src1, int len)
00043 {
00044     int i;
00045     vector float d, s0, s1, h0, l0,
00046                  s2, s3, zero = (vector float)vec_splat_u32(0);
00047     src1 += len-4;
00048     for(i=0; i<len-7; i+=8) {
00049         s1 = vec_ld(0, src1-i);              // [a,b,c,d]
00050         s0 = vec_ld(0, src0+i);
00051         l0 = vec_mergel(s1, s1);             // [c,c,d,d]
00052         s3 = vec_ld(-16, src1-i);
00053         h0 = vec_mergeh(s1, s1);             // [a,a,b,b]
00054         s2 = vec_ld(16, src0+i);
00055         s1 = vec_mergeh(vec_mergel(l0,h0),   // [d,b,d,b]
00056                         vec_mergeh(l0,h0));  // [c,a,c,a]
00057                                              // [d,c,b,a]
00058         l0 = vec_mergel(s3, s3);
00059         d = vec_madd(s0, s1, zero);
00060         h0 = vec_mergeh(s3, s3);
00061         vec_st(d, 0, dst+i);
00062         s3 = vec_mergeh(vec_mergel(l0,h0),
00063                         vec_mergeh(l0,h0));
00064         d = vec_madd(s2, s3, zero);
00065         vec_st(d, 16, dst+i);
00066     }
00067 }
00068 
00069 static void vector_fmul_add_altivec(float *dst, const float *src0,
00070                                     const float *src1, const float *src2,
00071                                     int len)
00072 {
00073     int i;
00074     vector float d, s0, s1, s2, t0, t1, edges;
00075     vector unsigned char align = vec_lvsr(0,dst),
00076                          mask = vec_lvsl(0, dst);
00077 
00078     for (i=0; i<len-3; i+=4) {
00079         t0 = vec_ld(0, dst+i);
00080         t1 = vec_ld(15, dst+i);
00081         s0 = vec_ld(0, src0+i);
00082         s1 = vec_ld(0, src1+i);
00083         s2 = vec_ld(0, src2+i);
00084         edges = vec_perm(t1 ,t0, mask);
00085         d = vec_madd(s0,s1,s2);
00086         t1 = vec_perm(d, edges, align);
00087         t0 = vec_perm(edges, d, align);
00088         vec_st(t1, 15, dst+i);
00089         vec_st(t0, 0, dst+i);
00090     }
00091 }
00092 
00093 static void vector_fmul_window_altivec(float *dst, const float *src0, const float *src1, const float *win, int len)
00094 {
00095     vector float zero, t0, t1, s0, s1, wi, wj;
00096     const vector unsigned char reverse = vcprm(3,2,1,0);
00097     int i,j;
00098 
00099     dst += len;
00100     win += len;
00101     src0+= len;
00102 
00103     zero = (vector float)vec_splat_u32(0);
00104 
00105     for(i=-len*4, j=len*4-16; i<0; i+=16, j-=16) {
00106         s0 = vec_ld(i, src0);
00107         s1 = vec_ld(j, src1);
00108         wi = vec_ld(i, win);
00109         wj = vec_ld(j, win);
00110 
00111         s1 = vec_perm(s1, s1, reverse);
00112         wj = vec_perm(wj, wj, reverse);
00113 
00114         t0 = vec_madd(s0, wj, zero);
00115         t0 = vec_nmsub(s1, wi, t0);
00116         t1 = vec_madd(s0, wi, zero);
00117         t1 = vec_madd(s1, wj, t1);
00118         t1 = vec_perm(t1, t1, reverse);
00119 
00120         vec_st(t0, i, dst);
00121         vec_st(t1, j, dst);
00122     }
00123 }
00124 
00125 void float_init_altivec(DSPContext* c, AVCodecContext *avctx)
00126 {
00127     c->vector_fmul = vector_fmul_altivec;
00128     c->vector_fmul_reverse = vector_fmul_reverse_altivec;
00129     c->vector_fmul_add = vector_fmul_add_altivec;
00130     if(!(avctx->flags & CODEC_FLAG_BITEXACT)) {
00131         c->vector_fmul_window = vector_fmul_window_altivec;
00132     }
00133 }