apps/codecs/libspeex/lsp_bfin.h

   1 /* Copyright (C) 2006 David Rowe */
   2 /**
   3    @file lsp_bfin.h
   4    @author David Rowe
   5    @brief LSP routines optimised for the Blackfin
   6 */
   7 /*
   8    Redistribution and use in source and binary forms, with or without
   9    modification, are permitted provided that the following conditions
  10    are met:
  11
  12    - Redistributions of source code must retain the above copyright
  13    notice, this list of conditions and the following disclaimer.
  14
  15    - Redistributions in binary form must reproduce the above copyright
  16    notice, this list of conditions and the following disclaimer in the
  17    documentation and/or other materials provided with the distribution.
  18
  19    - Neither the name of the Xiph.org Foundation nor the names of its
  20    contributors may be used to endorse or promote products derived from
  21    this software without specific prior written permission.
  22
  23    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  24    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  25    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  26    A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
  27    CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  28    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  29    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  30    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31    LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34 */
  35
  36 #define OVERRIDE_CHEB_POLY_EVA
  37 #ifdef OVERRIDE_CHEB_POLY_EVA
  38 static inline spx_word32_t cheb_poly_eva(
  39   spx_word16_t *coef, /* P or Q coefs in Q13 format               */
  40   spx_word16_t     x, /* cos of freq (-1.0 to 1.0) in Q14 format  */
  41   int              m, /* LPC order/2                              */
  42   char         *stack
  43 )
  44 {
  45     spx_word32_t sum;
  46
  47    __asm__ __volatile__
  48      (
  49       "P0 = %2;\n\t"           /* P0: coef[m], coef[m-1],..., coef[0] */
  50       "R4 = 8192;\n\t"         /* R4: rounding constant               */
  51       "R2 = %1;\n\t"           /* R2: x  */
  52
  53       "R5 = -16383;\n\t"
  54       "R2 = MAX(R2,R5);\n\t"
  55       "R5 = 16383;\n\t"
  56       "R2 = MIN(R2,R5);\n\t"
  57
  58       "R3 = W[P0--] (X);\n\t"  /* R3: sum */
  59       "R5 = W[P0--] (X);\n\t"
  60       "R5 = R5.L * R2.L (IS);\n\t"
  61       "R5 = R5 + R4;\n\t"
  62       "R5 >>>= 14;\n\t"
  63       "R3 = R3 + R5;\n\t"
  64
  65       "R0 = R2;\n\t"           /* R0: b0 */
  66       "R1 = 16384;\n\t"        /* R1: b1 */
  67       "LOOP cpe%= LC0 = %3;\n\t"
  68       "LOOP_BEGIN cpe%=;\n\t"
  69         "P1 = R0;\n\t"
  70         "R0 = R2.L * R0.L (IS) || R5 = W[P0--] (X);\n\t"
  71         "R0 >>>= 13;\n\t"
  72         "R0 = R0 - R1;\n\t"
  73         "R1 = P1;\n\t"
  74         "R5 = R5.L * R0.L (IS);\n\t"
  75         "R5 = R5 + R4;\n\t"
  76         "R5 >>>= 14;\n\t"
  77         "R3 = R3 + R5;\n\t"
  78       "LOOP_END cpe%=;\n\t"
  79       "%0 = R3;\n\t"
  80       : "=&d" (sum)
  81       : "a" (x), "a" (&coef[m]), "a" (m-1)
  82       : "R0", "R1", "R3", "R2", "R4", "R5", "P0", "P1"
  83       );
  84     return sum;
  85 }
  86 #endif
  87
  88
  89