apps/codecs/libspeex/fixed_bfin.h

   1 /* Copyright (C) 2005 Analog Devices
   2    Author: Jean-Marc Valin */
   3 /**
   4    @file fixed_bfin.h
   5    @brief Blackfin fixed-point operations
   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 #ifndef FIXED_BFIN_H
  37 #define FIXED_BFIN_H
  38
  39 #undef PDIV32_16
  40 static inline spx_word16_t PDIV32_16(spx_word32_t a, spx_word16_t b)
  41 {
  42    spx_word32_t res, bb;
  43    bb = b;
  44    a += b>>1;
  45    __asm__  (
  46          "P0 = 15;\n\t"
  47          "R0 = %1;\n\t"
  48          "R1 = %2;\n\t"
  49          //"R0 = R0 + R1;\n\t"
  50          "R0 <<= 1;\n\t"
  51          "DIVS (R0, R1);\n\t"
  52          "LOOP divide%= LC0 = P0;\n\t"
  53          "LOOP_BEGIN divide%=;\n\t"
  54             "DIVQ (R0, R1);\n\t"
  55          "LOOP_END divide%=;\n\t"
  56          "R0 = R0.L;\n\t"
  57          "%0 = R0;\n\t"
  58    : "=m" (res)
  59    : "m" (a), "m" (bb)
  60    : "P0", "R0", "R1", "cc");
  61    return res;
  62 }
  63
  64 #undef DIV32_16
  65 static inline spx_word16_t DIV32_16(spx_word32_t a, spx_word16_t b)
  66 {
  67    spx_word32_t res, bb;
  68    bb = b;
  69    /* Make the roundinf consistent with the C version
  70       (do we need to do that?)*/
  71    if (a<0)
  72       a += (b-1);
  73    __asm__  (
  74          "P0 = 15;\n\t"
  75          "R0 = %1;\n\t"
  76          "R1 = %2;\n\t"
  77          "R0 <<= 1;\n\t"
  78          "DIVS (R0, R1);\n\t"
  79          "LOOP divide%= LC0 = P0;\n\t"
  80          "LOOP_BEGIN divide%=;\n\t"
  81             "DIVQ (R0, R1);\n\t"
  82          "LOOP_END divide%=;\n\t"
  83          "R0 = R0.L;\n\t"
  84          "%0 = R0;\n\t"
  85    : "=m" (res)
  86    : "m" (a), "m" (bb)
  87    : "P0", "R0", "R1", "cc");
  88    return res;
  89 }
  90
  91 #undef MAX16
  92 static inline spx_word16_t MAX16(spx_word16_t a, spx_word16_t b)
  93 {
  94    spx_word32_t res;
  95    __asm__  (
  96          "%1 = %1.L (X);\n\t"
  97          "%2 = %2.L (X);\n\t"
  98          "%0 = MAX(%1,%2);"
  99    : "=d" (res)
 100    : "%d" (a), "d" (b)
 101    );
 102    return res;
 103 }
 104
 105 #undef MULT16_32_Q15
 106 static inline spx_word32_t MULT16_32_Q15(spx_word16_t a, spx_word32_t b)
 107 {
 108    spx_word32_t res;
 109    __asm__
 110    (
 111          "A1 = %2.L*%1.L (M);\n\t"
 112          "A1 = A1 >>> 15;\n\t"
 113          "%0 = (A1 += %2.L*%1.H) ;\n\t"
 114    : "=&W" (res), "=&d" (b)
 115    : "d" (a), "1" (b)
 116    : "A1"
 117    );
 118    return res;
 119 }
 120
 121 #undef MAC16_32_Q15
 122 static inline spx_word32_t MAC16_32_Q15(spx_word32_t c, spx_word16_t a, spx_word32_t b)
 123 {
 124    spx_word32_t res;
 125    __asm__
 126          (
 127          "A1 = %2.L*%1.L (M);\n\t"
 128          "A1 = A1 >>> 15;\n\t"
 129          "%0 = (A1 += %2.L*%1.H);\n\t"
 130          "%0 = %0 + %4;\n\t"
 131    : "=&W" (res), "=&d" (b)
 132    : "d" (a), "1" (b), "d" (c)
 133    : "A1"
 134          );
 135    return res;
 136 }
 137
 138 #undef MULT16_32_Q14
 139 static inline spx_word32_t MULT16_32_Q14(spx_word16_t a, spx_word32_t b)
 140 {
 141    spx_word32_t res;
 142    __asm__
 143          (
 144          "%2 <<= 1;\n\t"
 145          "A1 = %1.L*%2.L (M);\n\t"
 146          "A1 = A1 >>> 15;\n\t"
 147          "%0 = (A1 += %1.L*%2.H);\n\t"
 148    : "=W" (res), "=d" (a), "=d" (b)
 149    : "1" (a), "2" (b)
 150    : "A1"
 151          );
 152    return res;
 153 }
 154
 155 #undef MAC16_32_Q14
 156 static inline spx_word32_t MAC16_32_Q14(spx_word32_t c, spx_word16_t a, spx_word32_t b)
 157 {
 158    spx_word32_t res;
 159    __asm__
 160          (
 161          "%1 <<= 1;\n\t"
 162          "A1 = %2.L*%1.L (M);\n\t"
 163          "A1 = A1 >>> 15;\n\t"
 164          "%0 = (A1 += %2.L*%1.H);\n\t"
 165          "%0 = %0 + %4;\n\t"
 166    : "=&W" (res), "=&d" (b)
 167    : "d" (a), "1" (b), "d" (c)
 168    : "A1"
 169          );
 170    return res;
 171 }
 172
 173 #endif