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annotate src/libm/math_private.h @ 5029:5d7d48157be7

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Greg Jandl to SDL I did some digging, and I think I've found a better solution. By including some additional .m4 macros in the acinclude directory (http://www.gnu.org/software/autoconf-archive/ax_check_compiler_flags.html, http://www.gnu.org/software/autoconf-archive/ax_gcc_archflag.html and http://www.gnu.org/software/autoconf-archive/ax_gcc_x86_cpuid.html) then using the patch below (same as previous patch + one line change to configure.in), SDL will build correctly out of the box. The arch can then be overridden by --with-gcc-arch=<arch> (most will probably want to build with i686 there for general distribution) or --without-gcc-arch, to disable setting the arch all together. On my Atom netbook, I get -march=PentiumPro by default, which works great, as does --with-gcc-arch=i686.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 18 Jan 2011 22:40:45 -0800
parents fd40b483d489
children c2539ff054c8
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 "SDL_endian.h"
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22 #include <sys/types.h>
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23
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24 #define attribute_hidden
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25 #define libm_hidden_proto(x)
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26 #define libm_hidden_def(x)
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27
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28 typedef unsigned int u_int32_t;
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29
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30 /* The original fdlibm code used statements like:
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31 n0 = ((*(int*)&one)>>29)^1; * index of high word *
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32 ix0 = *(n0+(int*)&x); * high word of x *
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33 ix1 = *((1-n0)+(int*)&x); * low word of x *
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34 to dig two 32 bit words out of the 64 bit IEEE floating point
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35 value. That is non-ANSI, and, moreover, the gcc instruction
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36 scheduler gets it wrong. We instead use the following macros.
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37 Unlike the original code, we determine the endianness at compile
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38 time, not at run time; I don't see much benefit to selecting
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39 endianness at run time. */
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40
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41 /* A union which permits us to convert between a double and two 32 bit
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42 ints. */
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43
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44 /*
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45 * Math on arm is special:
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46 * For FPA, float words are always big-endian.
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47 * For VFP, floats words follow the memory system mode.
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48 */
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49
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50 #if (SDL_BYTEORDER == SDL_BIG_ENDIAN)
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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_ */