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  1. /*
  2.  * GMC (Global Motion Compensation)
  3.  * AltiVec-enabled
  4.  * Copyright (c) 2003 Romain Dolbeau <romain@dolbeau.org>
  5.  *
  6.  * This file is part of FFmpeg.
  7.  *
  8.  * FFmpeg is free software; you can redistribute it and/or
  9.  * modify it under the terms of the GNU Lesser General Public
  10.  * License as published by the Free Software Foundation; either
  11.  * version 2.1 of the License, or (at your option) any later version.
  12.  *
  13.  * FFmpeg is distributed in the hope that it will be useful,
  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16.  * Lesser General Public License for more details.
  17.  *
  18.  * You should have received a copy of the GNU Lesser General Public
  19.  * License along with FFmpeg; if not, write to the Free Software
  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21.  */
  22.  
  23. #include "libavutil/mem.h"
  24. #include "libavutil/ppc/types_altivec.h"
  25. #include "libavutil/ppc/util_altivec.h"
  26. #include "dsputil_altivec.h"
  27.  
  28. /*
  29.   altivec-enhanced gmc1. ATM this code assume stride is a multiple of 8,
  30.   to preserve proper dst alignment.
  31. */
  32. void ff_gmc1_altivec(uint8_t *dst /* align 8 */, uint8_t *src /* align1 */, int stride, int h, int x16, int y16, int rounder)
  33. {
  34.     const DECLARE_ALIGNED(16, unsigned short, rounder_a) = rounder;
  35.     const DECLARE_ALIGNED(16, unsigned short, ABCD)[8] =
  36.         {
  37.             (16-x16)*(16-y16), /* A */
  38.             (   x16)*(16-y16), /* B */
  39.             (16-x16)*(   y16), /* C */
  40.             (   x16)*(   y16), /* D */
  41.             0, 0, 0, 0         /* padding */
  42.         };
  43.     register const vector unsigned char vczero = (const vector unsigned char)vec_splat_u8(0);
  44.     register const vector unsigned short vcsr8 = (const vector unsigned short)vec_splat_u16(8);
  45.     register vector unsigned char dstv, dstv2, src_0, src_1, srcvA, srcvB, srcvC, srcvD;
  46.     register vector unsigned short Av, Bv, Cv, Dv, rounderV, tempA, tempB, tempC, tempD;
  47.     int i;
  48.     unsigned long dst_odd = (unsigned long)dst & 0x0000000F;
  49.     unsigned long src_really_odd = (unsigned long)src & 0x0000000F;
  50.  
  51.     tempA = vec_ld(0, (const unsigned short*)ABCD);
  52.     Av = vec_splat(tempA, 0);
  53.     Bv = vec_splat(tempA, 1);
  54.     Cv = vec_splat(tempA, 2);
  55.     Dv = vec_splat(tempA, 3);
  56.  
  57.     rounderV = vec_splat((vec_u16)vec_lde(0, &rounder_a), 0);
  58.  
  59.     // we'll be able to pick-up our 9 char elements
  60.     // at src from those 32 bytes
  61.     // we load the first batch here, as inside the loop
  62.     // we can re-use 'src+stride' from one iteration
  63.     // as the 'src' of the next.
  64.     src_0 = vec_ld(0, src);
  65.     src_1 = vec_ld(16, src);
  66.     srcvA = vec_perm(src_0, src_1, vec_lvsl(0, src));
  67.  
  68.     if (src_really_odd != 0x0000000F) {
  69.         // if (src & 0xF) == 0xF, then (src+1) is properly aligned
  70.         // on the second vector.
  71.         srcvB = vec_perm(src_0, src_1, vec_lvsl(1, src));
  72.     } else {
  73.         srcvB = src_1;
  74.     }
  75.     srcvA = vec_mergeh(vczero, srcvA);
  76.     srcvB = vec_mergeh(vczero, srcvB);
  77.  
  78.     for(i=0; i<h; i++) {
  79.         dst_odd = (unsigned long)dst & 0x0000000F;
  80.         src_really_odd = (((unsigned long)src) + stride) & 0x0000000F;
  81.  
  82.         dstv = vec_ld(0, dst);
  83.  
  84.         // we we'll be able to pick-up our 9 char elements
  85.         // at src + stride from those 32 bytes
  86.         // then reuse the resulting 2 vectors srvcC and srcvD
  87.         // as the next srcvA and srcvB
  88.         src_0 = vec_ld(stride + 0, src);
  89.         src_1 = vec_ld(stride + 16, src);
  90.         srcvC = vec_perm(src_0, src_1, vec_lvsl(stride + 0, src));
  91.  
  92.         if (src_really_odd != 0x0000000F) {
  93.             // if (src & 0xF) == 0xF, then (src+1) is properly aligned
  94.             // on the second vector.
  95.             srcvD = vec_perm(src_0, src_1, vec_lvsl(stride + 1, src));
  96.         } else {
  97.             srcvD = src_1;
  98.         }
  99.  
  100.         srcvC = vec_mergeh(vczero, srcvC);
  101.         srcvD = vec_mergeh(vczero, srcvD);
  102.  
  103.  
  104.         // OK, now we (finally) do the math :-)
  105.         // those four instructions replaces 32 int muls & 32 int adds.
  106.         // isn't AltiVec nice ?
  107.         tempA = vec_mladd((vector unsigned short)srcvA, Av, rounderV);
  108.         tempB = vec_mladd((vector unsigned short)srcvB, Bv, tempA);
  109.         tempC = vec_mladd((vector unsigned short)srcvC, Cv, tempB);
  110.         tempD = vec_mladd((vector unsigned short)srcvD, Dv, tempC);
  111.  
  112.         srcvA = srcvC;
  113.         srcvB = srcvD;
  114.  
  115.         tempD = vec_sr(tempD, vcsr8);
  116.  
  117.         dstv2 = vec_pack(tempD, (vector unsigned short)vczero);
  118.  
  119.         if (dst_odd) {
  120.             dstv2 = vec_perm(dstv, dstv2, vcprm(0,1,s0,s1));
  121.         } else {
  122.             dstv2 = vec_perm(dstv, dstv2, vcprm(s0,s1,2,3));
  123.         }
  124.  
  125.         vec_st(dstv2, 0, dst);
  126.  
  127.         dst += stride;
  128.         src += stride;
  129.     }
  130. }
  131.