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annotate src/libm/math_private.h @ 4639:f5cd4b6231ba

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Added Test Directory. Touch input works in touchSimp for wacom bamboo fun on Ubuntu linux. Not yet integrated into library. Should support other touch devices and other linux distros, but not tested on anything else.
author Jim Grandpre <jim.tla@gmail.com>
date Mon, 24 May 2010 23:44:24 -0400
parents 02aa80d7905f
children fd40b483d489
rev   line source
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1 /*
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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
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12 /*
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13 * from: @(#)fdlibm.h 5.1 93/09/24
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14 * $Id: math_private.h,v 1.3 2004/02/09 07:10:38 andersen Exp $
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15 */
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16
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17 #ifndef _MATH_PRIVATE_H_
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18 #define _MATH_PRIVATE_H_
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19
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20 /*#include <endian.h>*/
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21 #include <sys/types.h>
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22
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23 #define attribute_hidden
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24 #define libm_hidden_proto(x)
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25 #define libm_hidden_def(x)
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26
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27 typedef unsigned int u_int32_t;
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28
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29 /* The original fdlibm code used statements like:
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30 n0 = ((*(int*)&one)>>29)^1; * index of high word *
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31 ix0 = *(n0+(int*)&x); * high word of x *
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32 ix1 = *((1-n0)+(int*)&x); * low word of x *
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33 to dig two 32 bit words out of the 64 bit IEEE floating point
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34 value. That is non-ANSI, and, moreover, the gcc instruction
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35 scheduler gets it wrong. We instead use the following macros.
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36 Unlike the original code, we determine the endianness at compile
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37 time, not at run time; I don't see much benefit to selecting
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38 endianness at run time. */
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39
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40 /* A union which permits us to convert between a double and two 32 bit
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41 ints. */
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42
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43 /*
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44 * Math on arm is special:
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45 * For FPA, float words are always big-endian.
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46 * For VFP, floats words follow the memory system mode.
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47 */
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48
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49 #if (__BYTE_ORDER == __BIG_ENDIAN) || \
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50 (!defined(__VFP_FP__) && (defined(__arm__) || defined(__thumb__)))
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51
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52 typedef union
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53 {
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54 double value;
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55 struct
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56 {
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57 u_int32_t msw;
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58 u_int32_t lsw;
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59 } parts;
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60 } ieee_double_shape_type;
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61
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62 #else
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63
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64 typedef union
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65 {
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66 double value;
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67 struct
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68 {
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69 u_int32_t lsw;
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70 u_int32_t msw;
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71 } parts;
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72 } ieee_double_shape_type;
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73
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74 #endif
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75
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76 /* Get two 32 bit ints from a double. */
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77
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78 #define EXTRACT_WORDS(ix0,ix1,d) \
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79 do { \
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80 ieee_double_shape_type ew_u; \
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81 ew_u.value = (d); \
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82 (ix0) = ew_u.parts.msw; \
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83 (ix1) = ew_u.parts.lsw; \
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84 } while (0)
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85
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86 /* Get the more significant 32 bit int from a double. */
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87
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88 #define GET_HIGH_WORD(i,d) \
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89 do { \
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90 ieee_double_shape_type gh_u; \
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91 gh_u.value = (d); \
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92 (i) = gh_u.parts.msw; \
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93 } while (0)
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94
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95 /* Get the less significant 32 bit int from a double. */
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96
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97 #define GET_LOW_WORD(i,d) \
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98 do { \
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99 ieee_double_shape_type gl_u; \
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100 gl_u.value = (d); \
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101 (i) = gl_u.parts.lsw; \
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102 } while (0)
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103
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104 /* Set a double from two 32 bit ints. */
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105
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106 #define INSERT_WORDS(d,ix0,ix1) \
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107 do { \
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108 ieee_double_shape_type iw_u; \
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109 iw_u.parts.msw = (ix0); \
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110 iw_u.parts.lsw = (ix1); \
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111 (d) = iw_u.value; \
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112 } while (0)
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113
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114 /* Set the more significant 32 bits of a double from an int. */
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115
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116 #define SET_HIGH_WORD(d,v) \
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117 do { \
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118 ieee_double_shape_type sh_u; \
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119 sh_u.value = (d); \
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120 sh_u.parts.msw = (v); \
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121 (d) = sh_u.value; \
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122 } while (0)
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123
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124 /* Set the less significant 32 bits of a double from an int. */
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125
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126 #define SET_LOW_WORD(d,v) \
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127 do { \
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128 ieee_double_shape_type sl_u; \
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129 sl_u.value = (d); \
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130 sl_u.parts.lsw = (v); \
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131 (d) = sl_u.value; \
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132 } while (0)
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133
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134 /* A union which permits us to convert between a float and a 32 bit
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135 int. */
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136
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137 typedef union
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138 {
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139 float value;
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140 u_int32_t word;
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141 } ieee_float_shape_type;
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142
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143 /* Get a 32 bit int from a float. */
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144
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145 #define GET_FLOAT_WORD(i,d) \
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146 do { \
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147 ieee_float_shape_type gf_u; \
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148 gf_u.value = (d); \
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149 (i) = gf_u.word; \
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150 } while (0)
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151
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152 /* Set a float from a 32 bit int. */
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153
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154 #define SET_FLOAT_WORD(d,i) \
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155 do { \
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156 ieee_float_shape_type sf_u; \
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157 sf_u.word = (i); \
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158 (d) = sf_u.value; \
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159 } while (0)
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160
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161 /* ieee style elementary functions */
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162 extern double
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163 __ieee754_sqrt(double)
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164 attribute_hidden;
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165 extern double __ieee754_acos(double) attribute_hidden;
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166 extern double __ieee754_acosh(double) attribute_hidden;
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167 extern double __ieee754_log(double) attribute_hidden;
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168 extern double __ieee754_atanh(double) attribute_hidden;
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169 extern double __ieee754_asin(double) attribute_hidden;
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170 extern double __ieee754_atan2(double, double) attribute_hidden;
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171 extern double __ieee754_exp(double) attribute_hidden;
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172 extern double __ieee754_cosh(double) attribute_hidden;
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173 extern double __ieee754_fmod(double, double) attribute_hidden;
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174 extern double __ieee754_pow(double, double) attribute_hidden;
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175 extern double __ieee754_lgamma_r(double, int *) attribute_hidden;
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176 extern double __ieee754_gamma_r(double, int *) attribute_hidden;
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177 extern double __ieee754_lgamma(double) attribute_hidden;
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178 extern double __ieee754_gamma(double) attribute_hidden;
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179 extern double __ieee754_log10(double) attribute_hidden;
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180 extern double __ieee754_sinh(double) attribute_hidden;
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181 extern double __ieee754_hypot(double, double) attribute_hidden;
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182 extern double __ieee754_j0(double) attribute_hidden;
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183 extern double __ieee754_j1(double) attribute_hidden;
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184 extern double __ieee754_y0(double) attribute_hidden;
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185 extern double __ieee754_y1(double) attribute_hidden;
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186 extern double __ieee754_jn(int, double) attribute_hidden;
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187 extern double __ieee754_yn(int, double) attribute_hidden;
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188 extern double __ieee754_remainder(double, double) attribute_hidden;
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189 extern int __ieee754_rem_pio2(double, double *) attribute_hidden;
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190 #if defined(_SCALB_INT)
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191 extern double __ieee754_scalb(double, int) attribute_hidden;
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192 #else
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193 extern double __ieee754_scalb(double, double) attribute_hidden;
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194 #endif
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195
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196 /* fdlibm kernel function */
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197 #ifndef _IEEE_LIBM
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198 extern double __kernel_standard(double, double, int) attribute_hidden;
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199 #endif
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200 extern double __kernel_sin(double, double, int) attribute_hidden;
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201 extern double __kernel_cos(double, double) attribute_hidden;
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202 extern double __kernel_tan(double, double, int) attribute_hidden;
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203 extern int __kernel_rem_pio2(double *, double *, int, int, int,
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204 const int *) attribute_hidden;
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205
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206 #endif /* _MATH_PRIVATE_H_ */