Mercurial > octave
annotate liboctave/numeric/lo-mappers.h @ 21232:b8cf410b5c88
eliminate feature tests from lo-mappers.h
* lo-mappers.h, lo-mappers.cc (xisinf, xisnan, xfinite):
Move feature tests inside functions in lo-mappers.cc.
author | John W. Eaton <jwe@octave.org> |
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date | Tue, 09 Feb 2016 04:55:29 -0500 |
parents | 5f318c8ec634 |
children | 1473547f50f5 |
rev | line source |
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1967 | 1 /* |
2 | |
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3 Copyright (C) 1996-2015 John W. Eaton |
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4 Copyright (C) 2010 VZLU Prague |
1967 | 5 |
6 This file is part of Octave. | |
7 | |
8 Octave is free software; you can redistribute it and/or modify it | |
9 under the terms of the GNU General Public License as published by the | |
7016 | 10 Free Software Foundation; either version 3 of the License, or (at your |
11 option) any later version. | |
1967 | 12 |
13 Octave is distributed in the hope that it will be useful, but WITHOUT | |
14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
16 for more details. | |
17 | |
18 You should have received a copy of the GNU General Public License | |
7016 | 19 along with Octave; see the file COPYING. If not, see |
20 <http://www.gnu.org/licenses/>. | |
1967 | 21 |
22 */ | |
23 | |
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24 #if ! defined (octave_lo_mappers_h) |
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25 #define octave_lo_mappers_h 1 |
1967 | 26 |
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27 #include <limits> |
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28 |
1967 | 29 #include "oct-cmplx.h" |
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30 #include "lo-math.h" |
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31 #include "lo-ieee.h" |
1967 | 32 |
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33 // Double Precision |
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34 extern OCTAVE_API double xtrunc (double x); |
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35 extern OCTAVE_API double xcopysign (double x, double y); |
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36 inline double xceil (double x) { return ceil (x); } |
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37 extern OCTAVE_API double xfloor (double x); |
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38 inline double arg (double x) { return atan2 (0.0, x); } |
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39 inline double conj (double x) { return x; } |
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40 inline double fix (double x) { return xtrunc (x); } |
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41 inline double imag (double) { return 0.0; } |
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42 inline double real (double x) { return x; } |
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43 extern OCTAVE_API double xround (double x); |
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44 extern OCTAVE_API double xroundb (double x); |
6108 | 45 extern OCTAVE_API double signum (double x); |
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46 extern OCTAVE_API double xlog2 (double x); |
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47 extern OCTAVE_API Complex xlog2 (const Complex& x); |
7740 | 48 extern OCTAVE_API double xlog2 (double x, int& exp); |
49 extern OCTAVE_API Complex xlog2 (const Complex& x, int& exp); | |
6108 | 50 extern OCTAVE_API double xexp2 (double x); |
1967 | 51 |
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52 // These are used by the BOOL_OP macros in mx-op-defs.h. |
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53 inline bool xisnan (bool) { return false; } |
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54 inline bool xisnan (char) { return false; } |
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55 |
6108 | 56 extern OCTAVE_API bool xisnan (double x); |
57 extern OCTAVE_API bool xfinite (double x); | |
58 extern OCTAVE_API bool xisinf (double x); | |
3248 | 59 |
6108 | 60 extern OCTAVE_API bool octave_is_NA (double x); |
4025 | 61 |
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62 // Generic xmin, xmax definitions |
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63 template <typename T> |
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64 inline T xmin (T x, T y) |
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65 { |
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66 return x <= y ? x : y; |
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67 } |
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68 |
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69 template <typename T> |
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70 inline T xmax (T x, T y) |
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71 { |
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72 return x >= y ? x : y; |
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73 } |
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74 |
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75 // This form is favorable. GCC will translate (x <= y ? x : y) without a |
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76 // jump, hence the only conditional jump involved will be the first |
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77 // (xisnan), infrequent and hence friendly to branch prediction. |
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78 inline double |
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79 xmin (double x, double y) |
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80 { |
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81 return xisnan (y) ? x : (x <= y ? x : y); |
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82 } |
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83 |
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84 inline double |
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85 xmax (double x, double y) |
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86 { |
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87 return xisnan (y) ? x : (x >= y ? x : y); |
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88 } |
1967 | 89 |
6108 | 90 extern OCTAVE_API Complex acos (const Complex& x); |
91 extern OCTAVE_API Complex asin (const Complex& x); | |
92 extern OCTAVE_API Complex atan (const Complex& x); | |
3777 | 93 |
6108 | 94 extern OCTAVE_API bool octave_is_NA (const Complex& x); |
95 extern OCTAVE_API bool octave_is_NaN_or_NA (const Complex& x); | |
4469 | 96 |
6108 | 97 extern OCTAVE_API Complex xmin (const Complex& x, const Complex& y); |
98 extern OCTAVE_API Complex xmax (const Complex& x, const Complex& y); | |
3248 | 99 |
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100 // Single Precision |
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101 extern OCTAVE_API float xtrunc (float x); |
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102 extern OCTAVE_API float xcopysign (float x, float y); |
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103 inline float xceil (float x) { return ceilf (x); } |
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104 extern OCTAVE_API float xfloor (float x); |
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105 inline float arg (float x) { return atan2f (0.0f, x); } |
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106 inline float conj (float x) { return x; } |
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107 inline float fix (float x) { return xtrunc (x); } |
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108 inline float imag (float) { return 0.0f; } |
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109 inline float real (float x) { return x; } |
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110 extern OCTAVE_API float xround (float x); |
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111 extern OCTAVE_API float xroundb (float x); |
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112 extern OCTAVE_API float signum (float x); |
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113 extern OCTAVE_API float xlog2 (float x); |
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114 extern OCTAVE_API FloatComplex xlog2 (const FloatComplex& x); |
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115 extern OCTAVE_API float xlog2 (float x, int& exp); |
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116 extern OCTAVE_API FloatComplex xlog2 (const FloatComplex& x, int& exp); |
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117 extern OCTAVE_API float xexp2 (float x); |
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118 |
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119 extern OCTAVE_API bool xisnan (float x); |
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120 extern OCTAVE_API bool xfinite (float x); |
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121 extern OCTAVE_API bool xisinf (float x); |
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122 |
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123 extern OCTAVE_API bool octave_is_NA (float x); |
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124 |
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125 inline float |
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126 xmin (float x, float y) |
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127 { |
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128 return xisnan (y) ? x : (x <= y ? x : y); |
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129 } |
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130 |
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131 inline float |
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132 xmax (float x, float y) |
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133 { |
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134 return xisnan (y) ? x : (x >= y ? x : y); |
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135 } |
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136 |
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137 extern OCTAVE_API FloatComplex acos (const FloatComplex& x); |
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138 extern OCTAVE_API FloatComplex asin (const FloatComplex& x); |
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139 extern OCTAVE_API FloatComplex atan (const FloatComplex& x); |
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140 |
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141 extern OCTAVE_API bool octave_is_NA (const FloatComplex& x); |
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142 extern OCTAVE_API bool octave_is_NaN_or_NA (const FloatComplex& x); |
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143 |
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144 extern OCTAVE_API FloatComplex xmin (const FloatComplex& x, |
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145 const FloatComplex& y); |
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146 extern OCTAVE_API FloatComplex xmax (const FloatComplex& x, |
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147 const FloatComplex& y); |
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148 |
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149 // These map reals to Complex. |
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150 |
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151 extern OCTAVE_API Complex rc_acos (double); |
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152 extern OCTAVE_API FloatComplex rc_acos (float); |
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153 extern OCTAVE_API Complex rc_acosh (double); |
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154 extern OCTAVE_API FloatComplex rc_acosh (float); |
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155 extern OCTAVE_API Complex rc_asin (double); |
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156 extern OCTAVE_API FloatComplex rc_asin (float); |
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157 extern OCTAVE_API Complex rc_atanh (double); |
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158 extern OCTAVE_API FloatComplex rc_atanh (float); |
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159 extern OCTAVE_API Complex rc_log (double); |
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160 extern OCTAVE_API FloatComplex rc_log (float); |
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161 extern OCTAVE_API Complex rc_log2 (double); |
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162 extern OCTAVE_API FloatComplex rc_log2 (float); |
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163 extern OCTAVE_API Complex rc_log10 (double); |
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164 extern OCTAVE_API FloatComplex rc_log10 (float); |
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165 extern OCTAVE_API Complex rc_sqrt (double); |
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166 extern OCTAVE_API FloatComplex rc_sqrt (float); |
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167 |
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168 // Some useful tests, that are commonly repeated. |
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169 // Test for a finite integer. |
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170 inline bool |
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171 xisinteger (double x) |
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172 { |
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173 return xfinite (x) && x == xround (x); |
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174 } |
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175 |
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176 inline bool |
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177 xisinteger (float x) |
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178 { |
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179 return xfinite (x) && x == xround (x); |
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180 } |
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181 |
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182 // Test for negative sign. |
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183 extern OCTAVE_API bool xnegative_sign (double x); |
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184 extern OCTAVE_API bool xnegative_sign (float x); |
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185 |
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186 // Test for positive sign. |
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187 inline bool xpositive_sign (double x) { return ! xnegative_sign (x); } |
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188 inline bool xpositive_sign (float x) { return ! xnegative_sign (x); } |
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189 |
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190 // Some old rounding functions. |
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191 |
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192 extern OCTAVE_API octave_idx_type NINTbig (double x); |
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193 extern OCTAVE_API octave_idx_type NINTbig (float x); |
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194 |
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195 extern OCTAVE_API int NINT (double x); |
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196 extern OCTAVE_API int NINT (float x); |
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197 |
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198 template <typename T> |
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199 T |
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200 X_NINT (T x) |
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201 { |
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202 return (xfinite (x) ? xfloor (x + 0.5) : x); |
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203 } |
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204 |
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205 inline OCTAVE_API double D_NINT (double x) { return X_NINT (x); } |
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206 inline OCTAVE_API float F_NINT (float x) { return X_NINT (x); } |
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207 |
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208 // Template functions can have either float or double arguments. |
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209 |
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210 template <typename T> |
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211 bool |
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212 xisnan (const std::complex<T>& x) |
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213 { |
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214 return (xisnan (real (x)) || xisnan (imag (x))); |
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215 } |
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216 |
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217 template <typename T> |
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218 bool |
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219 xfinite (const std::complex<T>& x) |
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220 { |
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221 return (xfinite (real (x)) && xfinite (imag (x))); |
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222 } |
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223 |
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224 template <typename T> |
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225 bool |
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226 xisinf (const std::complex<T>& x) |
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227 { |
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228 return (xisinf (real (x)) || xisinf (imag (x))); |
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229 } |
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230 |
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231 template <typename T> |
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232 std::complex<T> |
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233 fix (const std::complex<T>& x) |
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234 { |
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235 return std::complex<T> (fix (real (x)), fix (imag (x))); |
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236 } |
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237 |
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238 template <typename T> |
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239 std::complex<T> |
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240 ceil (const std::complex<T>& x) |
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241 { |
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242 return std::complex<T> (xceil (real (x)), xceil (imag (x))); |
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243 } |
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244 |
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245 template <typename T> |
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246 std::complex<T> |
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247 floor (const std::complex<T>& x) |
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248 { |
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249 return std::complex<T> (xfloor (real (x)), xfloor (imag (x))); |
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250 } |
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251 |
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252 template <typename T> |
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253 std::complex<T> |
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254 xround (const std::complex<T>& x) |
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255 { |
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256 return std::complex<T> (xround (real (x)), xround (imag (x))); |
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257 } |
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258 |
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259 template <typename T> |
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260 std::complex<T> |
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261 xroundb (const std::complex<T>& x) |
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262 { |
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263 return std::complex<T> (xroundb (real (x)), xroundb (imag (x))); |
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264 } |
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265 |
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266 template <typename T> |
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267 std::complex<T> |
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268 signum (const std::complex<T>& x) |
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269 { |
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270 T tmp = abs (x); |
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271 |
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272 return tmp == 0 ? 0.0 : x / tmp; |
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273 } |
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274 |
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275 template <typename T> |
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276 T |
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277 xmod (T x, T y) |
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278 { |
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279 T retval; |
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280 |
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281 if (y == 0) |
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282 retval = x; |
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283 else |
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284 { |
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285 T q = x / y; |
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286 |
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287 if (X_NINT (y) != y |
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288 && (std::abs ((q - X_NINT (q)) / X_NINT (q)) |
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289 < std::numeric_limits<T>::epsilon ())) |
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290 retval = 0; |
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291 else |
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292 { |
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293 T n = xfloor (q); |
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294 |
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295 // Prevent use of extra precision. |
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296 volatile T tmp = y * n; |
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297 |
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298 retval = x - tmp; |
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299 } |
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300 } |
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301 |
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302 if (x != y && y != 0) |
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303 retval = xcopysign (retval, y); |
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304 |
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305 return retval; |
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306 } |
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307 |
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308 template <typename T> |
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309 T |
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310 xrem (T x, T y) |
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311 { |
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312 T retval; |
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313 |
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314 if (y == 0) |
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315 retval = octave_NaN; |
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316 else |
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317 { |
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318 T q = x / y; |
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319 |
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320 if (X_NINT (y) != y |
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321 && (std::abs ((q - X_NINT (q)) / X_NINT (q)) |
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322 < std::numeric_limits<T>::epsilon ())) |
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323 retval = 0; |
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324 else |
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325 { |
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326 T n = xtrunc (q); |
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327 |
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328 // Prevent use of extra precision. |
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329 volatile T tmp = y * n; |
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330 |
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331 retval = x - tmp; |
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332 } |
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333 } |
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334 |
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335 if (x != y && y != 0) |
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336 retval = xcopysign (retval, x); |
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337 |
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338 return retval; |
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339 } |
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340 |
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341 template <typename T> |
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342 T |
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343 xsignbit (T x) |
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344 { |
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345 return signbit (x); |
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346 } |
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347 |
1967 | 348 #endif |