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4349 | Serge | 1 | /* |
2 | * ==================================================== |
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3 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
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4 | * |
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5 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
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6 | * Permission to use, copy, modify, and distribute this |
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7 | * software is freely granted, provided that this notice |
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8 | * is preserved. |
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9 | * ==================================================== |
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10 | */ |
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11 | |||
12 | /* |
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13 | FUNCTION |
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14 | < |
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15 | |||
16 | INDEX |
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17 | isnan |
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18 | INDEX |
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19 | isinf |
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20 | INDEX |
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21 | finite |
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22 | |||
23 | INDEX |
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24 | isnanf |
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25 | INDEX |
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26 | isinff |
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27 | INDEX |
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28 | finitef |
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29 | |||
30 | ANSI_SYNOPSIS |
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31 | #include |
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32 | int isnan(double <[arg]>); |
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33 | int isinf(double <[arg]>); |
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34 | int finite(double <[arg]>); |
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35 | int isnanf(float <[arg]>); |
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36 | int isinff(float <[arg]>); |
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37 | int finitef(float <[arg]>); |
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38 | |||
39 | TRAD_SYNOPSIS |
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40 | #include |
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41 | int isnan(<[arg]>) |
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42 | double <[arg]>; |
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43 | int isinf(<[arg]>) |
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44 | double <[arg]>; |
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45 | int finite(<[arg]>); |
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46 | double <[arg]>; |
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47 | int isnanf(<[arg]>); |
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48 | float <[arg]>; |
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49 | int isinff(<[arg]>); |
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50 | float <[arg]>; |
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51 | int finitef(<[arg]>); |
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52 | float <[arg]>; |
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53 | |||
54 | |||
55 | DESCRIPTION |
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56 | These functions provide information on the floating-point |
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57 | argument supplied. |
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58 | |||
59 | There are five major number formats: |
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60 | o+ |
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61 | o zero |
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62 | A number which contains all zero bits. |
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63 | o subnormal |
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64 | A number with a zero exponent but a nonzero fraction. |
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65 | o normal |
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66 | A number with an exponent and a fraction. |
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67 | o infinity |
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68 | A number with an all 1's exponent and a zero fraction. |
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69 | o NAN |
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70 | A number with an all 1's exponent and a nonzero fraction. |
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71 | |||
72 | o- |
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73 | |||
74 | < |
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75 | returns 1 if the argument is infinity. < |
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76 | argument is zero, subnormal or normal. |
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77 | |||
78 | Note that by the C99 standard, < |
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79 | taking any type of floating-point and are declared in |
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80 | < |
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81 | < |
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82 | |||
83 | The < |
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84 | operations as their < |
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85 | counterparts, but on single-precision floating-point numbers. |
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86 | |||
87 | QUICKREF |
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88 | isnan - pure |
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89 | QUICKREF |
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90 | isinf - pure |
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91 | QUICKREF |
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92 | finite - pure |
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93 | QUICKREF |
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94 | isnan - pure |
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95 | QUICKREF |
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96 | isinf - pure |
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97 | QUICKREF |
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98 | finite - pure |
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99 | */ |
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100 | |||
101 | /* |
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102 | * __isnand(x) returns 1 is x is nan, else 0; |
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103 | * no branching! |
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104 | */ |
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105 | |||
106 | #include "fdlibm.h" |
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107 | |||
108 | #ifndef _DOUBLE_IS_32BITS |
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109 | |||
110 | int |
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111 | _DEFUN (__isnand, (x), |
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112 | double x) |
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113 | { |
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114 | __int32_t hx,lx; |
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115 | EXTRACT_WORDS(hx,lx,x); |
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116 | hx &= 0x7fffffff; |
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117 | hx |= (__uint32_t)(lx|(-lx))>>31; |
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118 | hx = 0x7ff00000 - hx; |
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119 | return (int)(((__uint32_t)(hx))>>31); |
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120 | } |
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121 | |||
122 | #endif /* _DOUBLE_IS_32BITS */ |