Alexandre Savard | 0a32ed7 | 2012-08-07 19:26:46 -0400 | [diff] [blame] | 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 |