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230 | cejka | 1 | /* |
2 | * Copyright (C) 2005 Josef Cejka |
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3 | * All rights reserved. |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * |
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9 | * - Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * - Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * - The name of the author may not be used to endorse or promote products |
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15 | * derived from this software without specific prior written permission. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |||
29 | #include <arch/types.h> |
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30 | |||
31 | #define FMATH_EXPONENT_BIAS 1023 |
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32 | |||
33 | typedef unsigned char fmath_ld_descr_t[8]; |
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34 | |||
35 | typedef union { double bf; unsigned char ldd[8]; } fmath_ld_union_t; |
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36 | |||
37 | int fmath_is_negative(double num); |
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38 | //int fmath_is_exponent_negative(double num); |
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39 | |||
40 | /**returns exponent in binary encoding*/ |
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41 | signed short fmath_get_binary_exponent(double num); |
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42 | |||
43 | /**returns exponent in decimal encoding*/ |
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44 | double fmath_get_decimal_exponent(double num); |
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45 | |||
46 | /**returns mantisa in binary encoding */ |
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47 | __u64 fmath_get_binary_mantisa(double num) ; |
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48 | |||
49 | /** Function for extract integer part from double |
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50 | * @param num input value |
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51 | * @param intp integer part of num |
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52 | * @return non-integer part |
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53 | */ |
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54 | double fmath_fint(double num, double *intp); |
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55 | |||
56 | /** Return absolute value from num */ |
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57 | double fmath_abs(double num); |
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58 | |||
59 | double fmath_set_sign(double num,__u8 sign); |
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60 | |||
61 | /** count base^exponent from positive exponent |
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62 | * @param base |
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63 | * @param exponent - Must be > 0.0 |
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64 | * @return base^exponent or 0.0 (if exponent <=0.0) |
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65 | */ |
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66 | double fmath_dpow(double base, double exponent) ; |
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67 |