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annotate src/libm/math_private.h @ 2756:a98604b691c8

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Expanded the libm support and put it into a separate directory.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 15 Sep 2008 06:33:23 +0000
parents
children 02aa80d7905f
rev   line source
2756
a98604b691c8 Expanded the libm support and put it into a separate directory.
Sam Lantinga <slouken@libsdl.org>
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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 /* The original fdlibm code used statements like:
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28 n0 = ((*(int*)&one)>>29)^1; * index of high word *
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29 ix0 = *(n0+(int*)&x); * high word of x *
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30 ix1 = *((1-n0)+(int*)&x); * low word of x *
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31 to dig two 32 bit words out of the 64 bit IEEE floating point
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32 value. That is non-ANSI, and, moreover, the gcc instruction
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33 scheduler gets it wrong. We instead use the following macros.
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34 Unlike the original code, we determine the endianness at compile
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35 time, not at run time; I don't see much benefit to selecting
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36 endianness at run time. */
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37
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38 /* A union which permits us to convert between a double and two 32 bit
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39 ints. */
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40
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41 /*
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42 * Math on arm is special:
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43 * For FPA, float words are always big-endian.
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44 * For VFP, floats words follow the memory system mode.
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45 */
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46
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47 #if (__BYTE_ORDER == __BIG_ENDIAN) || \
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48 (!defined(__VFP_FP__) && (defined(__arm__) || defined(__thumb__)))
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49
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50 typedef union
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51 {
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52 double value;
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53 struct
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54 {
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55 u_int32_t msw;
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56 u_int32_t lsw;
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57 } parts;
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58 } ieee_double_shape_type;
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59
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60 #else
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61
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62 typedef union
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63 {
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64 double value;
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65 struct
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66 {
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67 u_int32_t lsw;
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68 u_int32_t msw;
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69 } parts;
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70 } ieee_double_shape_type;
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71
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72 #endif
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73
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74 /* Get two 32 bit ints from a double. */
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75
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76 #define EXTRACT_WORDS(ix0,ix1,d) \
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77 do { \
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78 ieee_double_shape_type ew_u; \
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79 ew_u.value = (d); \
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80 (ix0) = ew_u.parts.msw; \
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81 (ix1) = ew_u.parts.lsw; \
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82 } while (0)
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83
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84 /* Get the more significant 32 bit int from a double. */
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85
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86 #define GET_HIGH_WORD(i,d) \
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87 do { \
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88 ieee_double_shape_type gh_u; \
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89 gh_u.value = (d); \
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90 (i) = gh_u.parts.msw; \
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91 } while (0)
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92
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93 /* Get the less significant 32 bit int from a double. */
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94
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95 #define GET_LOW_WORD(i,d) \
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96 do { \
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97 ieee_double_shape_type gl_u; \
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98 gl_u.value = (d); \
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99 (i) = gl_u.parts.lsw; \
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100 } while (0)
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101
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102 /* Set a double from two 32 bit ints. */
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103
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104 #define INSERT_WORDS(d,ix0,ix1) \
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105 do { \
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106 ieee_double_shape_type iw_u; \
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107 iw_u.parts.msw = (ix0); \
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108 iw_u.parts.lsw = (ix1); \
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109 (d) = iw_u.value; \
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110 } while (0)
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111
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112 /* Set the more significant 32 bits of a double from an int. */
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113
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114 #define SET_HIGH_WORD(d,v) \
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115 do { \
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116 ieee_double_shape_type sh_u; \
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117 sh_u.value = (d); \
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118 sh_u.parts.msw = (v); \
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119 (d) = sh_u.value; \
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120 } while (0)
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121
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122 /* Set the less significant 32 bits of a double from an int. */
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123
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124 #define SET_LOW_WORD(d,v) \
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125 do { \
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126 ieee_double_shape_type sl_u; \
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127 sl_u.value = (d); \
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128 sl_u.parts.lsw = (v); \
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129 (d) = sl_u.value; \
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130 } while (0)
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131
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132 /* A union which permits us to convert between a float and a 32 bit
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133 int. */
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134
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135 typedef union
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136 {
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137 float value;
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138 u_int32_t word;
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139 } ieee_float_shape_type;
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140
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141 /* Get a 32 bit int from a float. */
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142
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143 #define GET_FLOAT_WORD(i,d) \
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144 do { \
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145 ieee_float_shape_type gf_u; \
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146 gf_u.value = (d); \
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147 (i) = gf_u.word; \
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148 } while (0)
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149
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150 /* Set a float from a 32 bit int. */
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151
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152 #define SET_FLOAT_WORD(d,i) \
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153 do { \
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154 ieee_float_shape_type sf_u; \
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155 sf_u.word = (i); \
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156 (d) = sf_u.value; \
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157 } while (0)
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158
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159 /* ieee style elementary functions */
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160 extern double
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161 __ieee754_sqrt(double)
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162 attribute_hidden;
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163 extern double __ieee754_acos(double) attribute_hidden;
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164 extern double __ieee754_acosh(double) attribute_hidden;
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165 extern double __ieee754_log(double) attribute_hidden;
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166 extern double __ieee754_atanh(double) attribute_hidden;
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167 extern double __ieee754_asin(double) attribute_hidden;
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168 extern double __ieee754_atan2(double, double) attribute_hidden;
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169 extern double __ieee754_exp(double) attribute_hidden;
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170 extern double __ieee754_cosh(double) attribute_hidden;
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171 extern double __ieee754_fmod(double, double) attribute_hidden;
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172 extern double __ieee754_pow(double, double) attribute_hidden;
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173 extern double __ieee754_lgamma_r(double, int *) attribute_hidden;
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174 extern double __ieee754_gamma_r(double, int *) attribute_hidden;
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175 extern double __ieee754_lgamma(double) attribute_hidden;
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176 extern double __ieee754_gamma(double) attribute_hidden;
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177 extern double __ieee754_log10(double) attribute_hidden;
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178 extern double __ieee754_sinh(double) attribute_hidden;
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179 extern double __ieee754_hypot(double, double) attribute_hidden;
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180 extern double __ieee754_j0(double) attribute_hidden;
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181 extern double __ieee754_j1(double) attribute_hidden;
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182 extern double __ieee754_y0(double) attribute_hidden;
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183 extern double __ieee754_y1(double) attribute_hidden;
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184 extern double __ieee754_jn(int, double) attribute_hidden;
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185 extern double __ieee754_yn(int, double) attribute_hidden;
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186 extern double __ieee754_remainder(double, double) attribute_hidden;
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187 extern int __ieee754_rem_pio2(double, double *) attribute_hidden;
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188 #if defined(_SCALB_INT)
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189 extern double __ieee754_scalb(double, int) attribute_hidden;
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190 #else
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191 extern double __ieee754_scalb(double, double) attribute_hidden;
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192 #endif
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193
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194 /* fdlibm kernel function */
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195 #ifndef _IEEE_LIBM
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196 extern double __kernel_standard(double, double, int) attribute_hidden;
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197 #endif
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198 extern double __kernel_sin(double, double, int) attribute_hidden;
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199 extern double __kernel_cos(double, double) attribute_hidden;
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200 extern double __kernel_tan(double, double, int) attribute_hidden;
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201 extern int __kernel_rem_pio2(double *, double *, int, int, int,
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202 const int *) attribute_hidden;
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203
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204 #endif /* _MATH_PRIVATE_H_ */