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4349 | Serge | 1 | #ifndef _IEEE_FP_H_ |
2 | #define _IEEE_FP_H_ |
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3 | |||
4 | #include "_ansi.h" |
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5 | |||
6 | #include |
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7 | |||
8 | _BEGIN_STD_C |
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9 | |||
10 | /* FIXME FIXME FIXME: |
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11 | Neither of __ieee_{float,double}_shape_tape seem to be used anywhere |
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12 | except in libm/test. If that is the case, please delete these from here. |
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13 | If that is not the case, please insert documentation here describing why |
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14 | they're needed. */ |
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15 | |||
16 | #ifdef __IEEE_BIG_ENDIAN |
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17 | |||
18 | typedef union |
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19 | { |
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20 | double value; |
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21 | struct |
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22 | { |
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23 | unsigned int sign : 1; |
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24 | unsigned int exponent: 11; |
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25 | unsigned int fraction0:4; |
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26 | unsigned int fraction1:16; |
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27 | unsigned int fraction2:16; |
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28 | unsigned int fraction3:16; |
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29 | |||
30 | } number; |
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31 | struct |
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32 | { |
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33 | unsigned int sign : 1; |
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34 | unsigned int exponent: 11; |
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35 | unsigned int quiet:1; |
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36 | unsigned int function0:3; |
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37 | unsigned int function1:16; |
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38 | unsigned int function2:16; |
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39 | unsigned int function3:16; |
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40 | } nan; |
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41 | struct |
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42 | { |
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43 | unsigned long msw; |
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44 | unsigned long lsw; |
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45 | } parts; |
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46 | long aslong[2]; |
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47 | } __ieee_double_shape_type; |
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48 | |||
49 | #endif |
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50 | |||
51 | #ifdef __IEEE_LITTLE_ENDIAN |
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52 | |||
53 | typedef union |
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54 | { |
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55 | double value; |
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56 | struct |
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57 | { |
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58 | #ifdef __SMALL_BITFIELDS |
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59 | unsigned int fraction3:16; |
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60 | unsigned int fraction2:16; |
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61 | unsigned int fraction1:16; |
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62 | unsigned int fraction0: 4; |
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63 | #else |
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64 | unsigned int fraction1:32; |
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65 | unsigned int fraction0:20; |
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66 | #endif |
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67 | unsigned int exponent :11; |
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68 | unsigned int sign : 1; |
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69 | } number; |
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70 | struct |
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71 | { |
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72 | #ifdef __SMALL_BITFIELDS |
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73 | unsigned int function3:16; |
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74 | unsigned int function2:16; |
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75 | unsigned int function1:16; |
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76 | unsigned int function0:3; |
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77 | #else |
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78 | unsigned int function1:32; |
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79 | unsigned int function0:19; |
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80 | #endif |
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81 | unsigned int quiet:1; |
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82 | unsigned int exponent: 11; |
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83 | unsigned int sign : 1; |
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84 | } nan; |
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85 | struct |
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86 | { |
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87 | unsigned long lsw; |
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88 | unsigned long msw; |
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89 | } parts; |
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90 | |||
91 | long aslong[2]; |
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92 | |||
93 | } __ieee_double_shape_type; |
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94 | |||
95 | #endif |
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96 | |||
97 | #ifdef __IEEE_BIG_ENDIAN |
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98 | |||
99 | typedef union |
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100 | { |
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101 | float value; |
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102 | struct |
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103 | { |
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104 | unsigned int sign : 1; |
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105 | unsigned int exponent: 8; |
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106 | unsigned int fraction0: 7; |
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107 | unsigned int fraction1: 16; |
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108 | } number; |
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109 | struct |
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110 | { |
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111 | unsigned int sign:1; |
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112 | unsigned int exponent:8; |
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113 | unsigned int quiet:1; |
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114 | unsigned int function0:6; |
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115 | unsigned int function1:16; |
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116 | } nan; |
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117 | long p1; |
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118 | |||
119 | } __ieee_float_shape_type; |
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120 | |||
121 | #endif |
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122 | |||
123 | #ifdef __IEEE_LITTLE_ENDIAN |
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124 | |||
125 | typedef union |
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126 | { |
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127 | float value; |
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128 | struct |
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129 | { |
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130 | unsigned int fraction0: 7; |
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131 | unsigned int fraction1: 16; |
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132 | unsigned int exponent: 8; |
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133 | unsigned int sign : 1; |
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134 | } number; |
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135 | struct |
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136 | { |
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137 | unsigned int function1:16; |
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138 | unsigned int function0:6; |
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139 | unsigned int quiet:1; |
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140 | unsigned int exponent:8; |
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141 | unsigned int sign:1; |
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142 | } nan; |
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143 | long p1; |
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144 | |||
145 | } __ieee_float_shape_type; |
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146 | |||
147 | #endif |
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148 | |||
149 | |||
150 | |||
151 | |||
152 | |||
153 | /* FLOATING ROUNDING */ |
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154 | |||
155 | typedef int fp_rnd; |
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156 | #define FP_RN 0 /* Round to nearest */ |
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157 | #define FP_RM 1 /* Round down */ |
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158 | #define FP_RP 2 /* Round up */ |
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159 | #define FP_RZ 3 /* Round to zero (trunate) */ |
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160 | |||
161 | fp_rnd _EXFUN(fpgetround,(void)); |
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162 | fp_rnd _EXFUN(fpsetround, (fp_rnd)); |
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163 | |||
164 | /* EXCEPTIONS */ |
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165 | |||
166 | typedef int fp_except; |
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167 | #define FP_X_INV 0x10 /* Invalid operation */ |
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168 | #define FP_X_DX 0x80 /* Divide by zero */ |
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169 | #define FP_X_OFL 0x04 /* Overflow exception */ |
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170 | #define FP_X_UFL 0x02 /* Underflow exception */ |
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171 | #define FP_X_IMP 0x01 /* imprecise exception */ |
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172 | |||
173 | fp_except _EXFUN(fpgetmask,(void)); |
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174 | fp_except _EXFUN(fpsetmask,(fp_except)); |
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175 | fp_except _EXFUN(fpgetsticky,(void)); |
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176 | fp_except _EXFUN(fpsetsticky, (fp_except)); |
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177 | |||
178 | /* INTEGER ROUNDING */ |
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179 | |||
180 | typedef int fp_rdi; |
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181 | #define FP_RDI_TOZ 0 /* Round to Zero */ |
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182 | #define FP_RDI_RD 1 /* Follow float mode */ |
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183 | |||
184 | fp_rdi _EXFUN(fpgetroundtoi,(void)); |
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185 | fp_rdi _EXFUN(fpsetroundtoi,(fp_rdi)); |
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186 | |||
187 | #undef isnan |
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188 | #undef isinf |
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189 | |||
190 | int _EXFUN(isnan, (double)); |
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191 | int _EXFUN(isinf, (double)); |
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192 | int _EXFUN(finite, (double)); |
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193 | |||
194 | |||
195 | |||
196 | int _EXFUN(isnanf, (float)); |
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197 | int _EXFUN(isinff, (float)); |
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198 | int _EXFUN(finitef, (float)); |
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199 | |||
200 | #define __IEEE_DBL_EXPBIAS 1023 |
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201 | #define __IEEE_FLT_EXPBIAS 127 |
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202 | |||
203 | #define __IEEE_DBL_EXPLEN 11 |
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204 | #define __IEEE_FLT_EXPLEN 8 |
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205 | |||
206 | |||
207 | #define __IEEE_DBL_FRACLEN (64 - (__IEEE_DBL_EXPLEN + 1)) |
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208 | #define __IEEE_FLT_FRACLEN (32 - (__IEEE_FLT_EXPLEN + 1)) |
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209 | |||
210 | #define __IEEE_DBL_MAXPOWTWO ((double)(1L << 32 - 2) * (1L << (32-11) - 32 + 1)) |
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211 | #define __IEEE_FLT_MAXPOWTWO ((float)(1L << (32-8) - 1)) |
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212 | |||
213 | #define __IEEE_DBL_NAN_EXP 0x7ff |
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214 | #define __IEEE_FLT_NAN_EXP 0xff |
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215 | |||
216 | #ifndef __ieeefp_isnanf |
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217 | #define __ieeefp_isnanf(x) (((*(long *)&(x) & 0x7f800000L)==0x7f800000L) && \ |
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218 | ((*(long *)&(x) & 0x007fffffL)!=0000000000L)) |
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219 | #endif |
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220 | #define isnanf(x) __ieeefp_isnanf(x) |
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221 | |||
222 | #ifndef __ieeefp_isinff |
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223 | #define __ieeefp_isinff(x) (((*(long *)&(x) & 0x7f800000L)==0x7f800000L) && \ |
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224 | ((*(long *)&(x) & 0x007fffffL)==0000000000L)) |
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225 | #endif |
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226 | #define isinff(x) __ieeefp_isinff(x) |
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227 | |||
228 | #ifndef __ieeefp_finitef |
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229 | #define __ieeefp_finitef(x) (((*(long *)&(x) & 0x7f800000L)!=0x7f800000L)) |
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230 | #endif |
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231 | #define finitef(x) __ieeefp_finitef(x) |
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232 | |||
233 | #ifdef _DOUBLE_IS_32BITS |
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234 | #undef __IEEE_DBL_EXPBIAS |
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235 | #define __IEEE_DBL_EXPBIAS __IEEE_FLT_EXPBIAS |
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236 | |||
237 | #undef __IEEE_DBL_EXPLEN |
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238 | #define __IEEE_DBL_EXPLEN __IEEE_FLT_EXPLEN |
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239 | |||
240 | #undef __IEEE_DBL_FRACLEN |
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241 | #define __IEEE_DBL_FRACLEN __IEEE_FLT_FRACLEN |
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242 | |||
243 | #undef __IEEE_DBL_MAXPOWTWO |
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244 | #define __IEEE_DBL_MAXPOWTWO __IEEE_FLT_MAXPOWTWO |
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245 | |||
246 | #undef __IEEE_DBL_NAN_EXP |
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247 | #define __IEEE_DBL_NAN_EXP __IEEE_FLT_NAN_EXP |
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248 | |||
249 | #undef __ieee_double_shape_type |
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250 | #define __ieee_double_shape_type __ieee_float_shape_type |
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251 | |||
252 | #endif /* _DOUBLE_IS_32BITS */ |
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253 | |||
254 | _END_STD_C |
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255 | |||
256 | #endif /* _IEEE_FP_H_ */><>><>><> |