media/libopus/celt/mips/vq_mipsr1.h

   1 /* Copyright (c) 2007-2008 CSIRO
   2    Copyright (c) 2007-2009 Xiph.Org Foundation
   3    Written by Jean-Marc Valin */
   4 /*
   5    Redistribution and use in source and binary forms, with or without
   6    modification, are permitted provided that the following conditions
   7    are met:
   8
   9    - Redistributions of source code must retain the above copyright
  10    notice, this list of conditions and the following disclaimer.
  11
  12    - Redistributions in binary form must reproduce the above copyright
  13    notice, this list of conditions and the following disclaimer in the
  14    documentation and/or other materials provided with the distribution.
  15
  16    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  19    A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
  20    OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  21    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  22    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  23    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  24    LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  25    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  26    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27 */
  28
  29 #ifndef VQ_MIPSR1_H__
  30 #define VQ_MIPSR1_H__
  31
  32 #ifdef HAVE_CONFIG_H
  33 #include "config.h"
  34 #endif
  35
  36 #include "mathops.h"
  37 #include "arch.h"
  38
  39 #define OVERRIDE_vq_exp_rotation1
  40 static void exp_rotation1(celt_norm *X, int len, int stride, opus_val16 c, opus_val16 s)
  41 {
  42    int i;
  43    opus_val16 ms;
  44    celt_norm *Xptr;
  45    Xptr = X;
  46    ms = NEG16(s);
  47    for (i=0;i<len-stride;i++)
  48    {
  49       celt_norm x1, x2;
  50       x1 = Xptr[0];
  51       x2 = Xptr[stride];
  52       Xptr[stride] = EXTRACT16(PSHR32(MAC16_16(MULT16_16(c, x2),  s, x1), 15));
  53       *Xptr++      = EXTRACT16(PSHR32(MAC16_16(MULT16_16(c, x1), ms, x2), 15));
  54    }
  55    Xptr = &X[len-2*stride-1];
  56    for (i=len-2*stride-1;i>=0;i--)
  57    {
  58       celt_norm x1, x2;
  59       x1 = Xptr[0];
  60       x2 = Xptr[stride];
  61       Xptr[stride] = EXTRACT16(PSHR32(MAC16_16(MULT16_16(c, x2),  s, x1), 15));
  62       *Xptr--      = EXTRACT16(PSHR32(MAC16_16(MULT16_16(c, x1), ms, x2), 15));
  63    }
  64 }
  65
  66 #define OVERRIDE_renormalise_vector
  67 void renormalise_vector(celt_norm *X, int N, opus_val16 gain, int arch)
  68 {
  69    int i;
  70 #ifdef FIXED_POINT
  71    int k;
  72 #endif
  73    opus_val32 E = EPSILON;
  74    opus_val16 g;
  75    opus_val32 t;
  76    celt_norm *xptr = X;
  77    int X0, X1;
  78
  79    (void)arch;
  80
  81    asm volatile("mult $ac1, $0, $0");
  82    asm volatile("MTLO %0, $ac1" : :"r" (E));
  83    /*if(N %4)
  84        printf("error");*/
  85    for (i=0;i<N-2;i+=2)
  86    {
  87       X0 = (int)*xptr++;
  88       asm volatile("MADD $ac1, %0, %1" : : "r" (X0), "r" (X0));
  89
  90       X1 = (int)*xptr++;
  91       asm volatile("MADD $ac1, %0, %1" : : "r" (X1), "r" (X1));
  92    }
  93
  94    for (;i<N;i++)
  95    {
  96       X0 = (int)*xptr++;
  97       asm volatile("MADD $ac1, %0, %1" : : "r" (X0), "r" (X0));
  98    }
  99
 100    asm volatile("MFLO %0, $ac1" : "=r" (E));
 101 #ifdef FIXED_POINT
 102    k = celt_ilog2(E)>>1;
 103 #endif
 104    t = VSHR32(E, 2*(k-7));
 105    g = MULT16_16_P15(celt_rsqrt_norm(t),gain);
 106
 107    xptr = X;
 108    for (i=0;i<N;i++)
 109    {
 110       *xptr = EXTRACT16(PSHR32(MULT16_16(g, *xptr), k+1));
 111       xptr++;
 112    }
 113    /*return celt_sqrt(E);*/
 114 }
 115
 116 #endif /* VQ_MIPSR1_H__ */