libavcodec/i386/fft_3dn.c

   1 /*
   2  * FFT/MDCT transform with 3DNow! optimizations
   3  * Copyright (c) 2006 Zuxy MENG Jie, Loren Merritt
   4  * Based on fft_sse.c copyright (c) 2002 Fabrice Bellard.
   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/x86_cpu.h"
  24 #include "libavcodec/dsputil.h"
  25
  26 static const int p1m1[2] __attribute__((aligned(8))) =
  27     { 0, 1 << 31 };
  28
  29 static const int m1p1[2] __attribute__((aligned(8))) =
  30     { 1 << 31, 0 };
  31
  32 void ff_fft_calc_3dn(FFTContext *s, FFTComplex *z)
  33 {
  34     int ln = s->nbits;
  35     long j;
  36     x86_reg i;
  37     long nblocks, nloops;
  38     FFTComplex *p, *cptr;
  39
  40     asm volatile(
  41         /* FEMMS is not a must here but recommended by AMD */
  42         "femms \n\t"
  43         "movq %0, %%mm7 \n\t"
  44         ::"m"(*(s->inverse ? m1p1 : p1m1))
  45     );
  46
  47     i = 8 << ln;
  48     asm volatile(
  49         "1: \n\t"
  50         "sub $32, %0 \n\t"
  51         "movq    (%0,%1), %%mm0 \n\t"
  52         "movq  16(%0,%1), %%mm1 \n\t"
  53         "movq   8(%0,%1), %%mm2 \n\t"
  54         "movq  24(%0,%1), %%mm3 \n\t"
  55         "movq      %%mm0, %%mm4 \n\t"
  56         "movq      %%mm1, %%mm5 \n\t"
  57         "pfadd     %%mm2, %%mm0 \n\t"
  58         "pfadd     %%mm3, %%mm1 \n\t"
  59         "pfsub     %%mm2, %%mm4 \n\t"
  60         "pfsub     %%mm3, %%mm5 \n\t"
  61         "movq      %%mm0, %%mm2 \n\t"
  62         "punpckldq %%mm5, %%mm6 \n\t"
  63         "punpckhdq %%mm6, %%mm5 \n\t"
  64         "movq      %%mm4, %%mm3 \n\t"
  65         "pxor      %%mm7, %%mm5 \n\t"
  66         "pfadd     %%mm1, %%mm0 \n\t"
  67         "pfadd     %%mm5, %%mm4 \n\t"
  68         "pfsub     %%mm1, %%mm2 \n\t"
  69         "pfsub     %%mm5, %%mm3 \n\t"
  70         "movq      %%mm0,   (%0,%1) \n\t"
  71         "movq      %%mm4,  8(%0,%1) \n\t"
  72         "movq      %%mm2, 16(%0,%1) \n\t"
  73         "movq      %%mm3, 24(%0,%1) \n\t"
  74         "jg 1b \n\t"
  75         :"+r"(i)
  76         :"r"(z)
  77     );
  78     /* pass 2 .. ln-1 */
  79
  80     nblocks = 1 << (ln-3);
  81     nloops = 1 << 2;
  82     cptr = s->exptab1;
  83     do {
  84         p = z;
  85         j = nblocks;
  86         do {
  87             i = nloops*8;
  88             asm volatile(
  89                 "1: \n\t"
  90                 "sub $16, %0 \n\t"
  91                 "movq    (%1,%0), %%mm0 \n\t"
  92                 "movq   8(%1,%0), %%mm1 \n\t"
  93                 "movq    (%2,%0), %%mm2 \n\t"
  94                 "movq   8(%2,%0), %%mm3 \n\t"
  95                 "movq      %%mm2, %%mm4 \n\t"
  96                 "movq      %%mm3, %%mm5 \n\t"
  97                 "punpckldq %%mm2, %%mm2 \n\t"
  98                 "punpckldq %%mm3, %%mm3 \n\t"
  99                 "punpckhdq %%mm4, %%mm4 \n\t"
 100                 "punpckhdq %%mm5, %%mm5 \n\t"
 101                 "pfmul   (%3,%0,2), %%mm2 \n\t" //  cre*re cim*re
 102                 "pfmul  8(%3,%0,2), %%mm3 \n\t"
 103                 "pfmul 16(%3,%0,2), %%mm4 \n\t" // -cim*im cre*im
 104                 "pfmul 24(%3,%0,2), %%mm5 \n\t"
 105                 "pfadd     %%mm2, %%mm4 \n\t" // cre*re-cim*im cim*re+cre*im
 106                 "pfadd     %%mm3, %%mm5 \n\t"
 107                 "movq      %%mm0, %%mm2 \n\t"
 108                 "movq      %%mm1, %%mm3 \n\t"
 109                 "pfadd     %%mm4, %%mm0 \n\t"
 110                 "pfadd     %%mm5, %%mm1 \n\t"
 111                 "pfsub     %%mm4, %%mm2 \n\t"
 112                 "pfsub     %%mm5, %%mm3 \n\t"
 113                 "movq      %%mm0,  (%1,%0) \n\t"
 114                 "movq      %%mm1, 8(%1,%0) \n\t"
 115                 "movq      %%mm2,  (%2,%0) \n\t"
 116                 "movq      %%mm3, 8(%2,%0) \n\t"
 117                 "jg 1b \n\t"
 118                 :"+r"(i)
 119                 :"r"(p), "r"(p + nloops), "r"(cptr)
 120             );
 121             p += nloops*2;
 122         } while (--j);
 123         cptr += nloops*2;
 124         nblocks >>= 1;
 125         nloops <<= 1;
 126     } while (nblocks != 0);
 127     asm volatile("femms");
 128 }