1 | /* Configuration for math routines. |
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2 | Copyright (c) 2017 ARM Ltd. All rights reserved. |
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3 | |
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4 | Redistribution and use in source and binary forms, with or without |
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5 | modification, are permitted provided that the following conditions |
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6 | are met: |
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7 | 1. Redistributions of source code must retain the above copyright |
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8 | notice, this list of conditions and the following disclaimer. |
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9 | 2. Redistributions in binary form must reproduce the above copyright |
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10 | notice, this list of conditions and the following disclaimer in the |
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11 | documentation and/or other materials provided with the distribution. |
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12 | 3. The name of the company may not be used to endorse or promote |
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13 | products derived from this software without specific prior written |
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14 | permission. |
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15 | |
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16 | THIS SOFTWARE IS PROVIDED BY ARM LTD ``AS IS AND ANY EXPRESS OR IMPLIED |
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17 | WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
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18 | MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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19 | IN NO EVENT SHALL ARM LTD BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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20 | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED |
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21 | TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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22 | PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
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23 | LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
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24 | NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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25 | SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ |
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26 | |
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27 | #ifndef _MATH_CONFIG_H |
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28 | #define _MATH_CONFIG_H |
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29 | |
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30 | #include <math.h> |
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31 | #include <stdint.h> |
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32 | |
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33 | #ifndef WANT_ROUNDING |
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34 | /* Correct special case results in non-nearest rounding modes. */ |
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35 | # define WANT_ROUNDING 1 |
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36 | #endif |
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37 | #ifndef WANT_ERRNO |
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38 | /* Set errno according to ISO C with (math_errhandling & MATH_ERRNO) != 0. */ |
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39 | # define WANT_ERRNO 1 |
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40 | #endif |
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41 | #ifndef WANT_ERRNO_UFLOW |
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42 | /* Set errno to ERANGE if result underflows to 0 (in all rounding modes). */ |
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43 | # define WANT_ERRNO_UFLOW (WANT_ROUNDING && WANT_ERRNO) |
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44 | #endif |
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45 | |
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46 | #ifndef TOINT_INTRINSICS |
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47 | # define TOINT_INTRINSICS 0 |
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48 | #endif |
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49 | #ifndef TOINT_RINT |
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50 | # define TOINT_RINT 0 |
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51 | #endif |
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52 | #ifndef TOINT_SHIFT |
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53 | # define TOINT_SHIFT 1 |
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54 | #endif |
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55 | |
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56 | static inline uint32_t |
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57 | asuint (float f) |
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58 | { |
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59 | union |
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60 | { |
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61 | float f; |
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62 | uint32_t i; |
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63 | } u = {f}; |
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64 | return u.i; |
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65 | } |
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66 | |
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67 | static inline float |
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68 | asfloat (uint32_t i) |
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69 | { |
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70 | union |
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71 | { |
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72 | uint32_t i; |
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73 | float f; |
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74 | } u = {i}; |
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75 | return u.f; |
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76 | } |
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77 | |
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78 | static inline uint64_t |
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79 | asuint64 (double f) |
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80 | { |
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81 | union |
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82 | { |
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83 | double f; |
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84 | uint64_t i; |
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85 | } u = {f}; |
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86 | return u.i; |
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87 | } |
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88 | |
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89 | static inline double |
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90 | asdouble (uint64_t i) |
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91 | { |
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92 | union |
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93 | { |
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94 | uint64_t i; |
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95 | double f; |
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96 | } u = {i}; |
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97 | return u.f; |
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98 | } |
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99 | |
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100 | #ifndef IEEE_754_2008_SNAN |
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101 | # define IEEE_754_2008_SNAN 1 |
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102 | #endif |
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103 | static inline int |
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104 | issignalingf_inline (float x) |
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105 | { |
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106 | uint32_t ix = asuint (x); |
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107 | if (!IEEE_754_2008_SNAN) |
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108 | return (ix & 0x7fc00000) == 0x7fc00000; |
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109 | return 2 * (ix ^ 0x00400000) > 2u * 0x7fc00000; |
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110 | } |
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111 | |
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112 | #ifdef __GNUC__ |
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113 | # define HIDDEN __attribute__ ((__visibility__ ("hidden"))) |
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114 | # define NOINLINE __attribute__ ((noinline)) |
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115 | #else |
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116 | # define HIDDEN |
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117 | # define NOINLINE |
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118 | #endif |
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119 | |
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120 | HIDDEN float __math_oflowf (unsigned long); |
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121 | HIDDEN float __math_uflowf (unsigned long); |
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122 | HIDDEN float __math_may_uflowf (unsigned long); |
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123 | HIDDEN float __math_divzerof (unsigned long); |
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124 | HIDDEN float __math_invalidf (float); |
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125 | |
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126 | /* Shared between expf, exp2f and powf. */ |
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127 | #define EXP2F_TABLE_BITS 5 |
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128 | #define EXP2F_POLY_ORDER 3 |
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129 | extern const struct exp2f_data |
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130 | { |
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131 | uint64_t tab[1 << EXP2F_TABLE_BITS]; |
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132 | double shift_scaled; |
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133 | double poly[EXP2F_POLY_ORDER]; |
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134 | double shift; |
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135 | double invln2_scaled; |
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136 | double poly_scaled[EXP2F_POLY_ORDER]; |
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137 | } __exp2f_data HIDDEN; |
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138 | |
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139 | #define LOGF_TABLE_BITS 4 |
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140 | #define LOGF_POLY_ORDER 4 |
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141 | extern const struct logf_data |
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142 | { |
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143 | struct |
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144 | { |
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145 | double invc, logc; |
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146 | } tab[1 << LOGF_TABLE_BITS]; |
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147 | double ln2; |
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148 | double poly[LOGF_POLY_ORDER - 1]; /* First order coefficient is 1. */ |
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149 | } __logf_data HIDDEN; |
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150 | |
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151 | #define LOG2F_TABLE_BITS 4 |
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152 | #define LOG2F_POLY_ORDER 4 |
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153 | extern const struct log2f_data |
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154 | { |
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155 | struct |
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156 | { |
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157 | double invc, logc; |
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158 | } tab[1 << LOG2F_TABLE_BITS]; |
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159 | double poly[LOG2F_POLY_ORDER]; |
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160 | } __log2f_data HIDDEN; |
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161 | |
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162 | #define POWF_LOG2_TABLE_BITS 4 |
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163 | #define POWF_LOG2_POLY_ORDER 5 |
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164 | #if TOINT_INTRINSICS |
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165 | # define POWF_SCALE_BITS EXP2F_TABLE_BITS |
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166 | #else |
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167 | # define POWF_SCALE_BITS 0 |
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168 | #endif |
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169 | #define POWF_SCALE ((double) (1 << POWF_SCALE_BITS)) |
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170 | extern const struct powf_log2_data |
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171 | { |
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172 | struct |
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173 | { |
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174 | double invc, logc; |
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175 | } tab[1 << POWF_LOG2_TABLE_BITS]; |
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176 | double poly[POWF_LOG2_POLY_ORDER]; |
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177 | } __powf_log2_data HIDDEN; |
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178 | |
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179 | #endif |
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