1 /* 2 * ==================================================== 3 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 4 * 5 * Developed at SunPro, a Sun Microsystems, Inc. business. 6 * Permission to use, copy, modify, and distribute this 7 * software is freely granted, provided that this notice 8 * is preserved. 9 * ==================================================== 10 */ 11 12 /* 13 * from: @(#)fdlibm.h 5.1 93/09/24 14 */ 15 16 #ifndef _MATH_PRIVATE_H_ 17 #define _MATH_PRIVATE_H_ 18 19 #include <endian.h> 20 #include <stdbool.h> 21 #include <stdint.h> 22 #include <sys/types.h> 23 24 /* Gather machine dependent _Floatn support. */ 25 #include <bits/floatn.h> 26 27 /* The original fdlibm code used statements like: 28 n0 = ((*(int*)&one)>>29)^1; * index of high word * 29 ix0 = *(n0+(int*)&x); * high word of x * 30 ix1 = *((1-n0)+(int*)&x); * low word of x * 31 to dig two 32 bit words out of the 64 bit IEEE floating point 32 value. That is non-ANSI, and, moreover, the gcc instruction 33 scheduler gets it wrong. We instead use the following macros. 34 Unlike the original code, we determine the endianness at compile 35 time, not at run time; I don't see much benefit to selecting 36 endianness at run time. */ 37 38 /* A union which permits us to convert between a double and two 32 bit 39 ints. */ 40 41 #if __FLOAT_WORD_ORDER == __BIG_ENDIAN 42 43 typedef union 44 { 45 double value; 46 struct 47 { 48 uint32_t msw; 49 uint32_t lsw; 50 } parts; 51 uint64_t word; 52 } ieee_double_shape_type; 53 54 #endif 55 56 #if __FLOAT_WORD_ORDER == __LITTLE_ENDIAN 57 58 typedef union 59 { 60 double value; 61 struct 62 { 63 uint32_t lsw; 64 uint32_t msw; 65 } parts; 66 uint64_t word; 67 } ieee_double_shape_type; 68 69 #endif 70 71 /* Get two 32 bit ints from a double. */ 72 73 #define EXTRACT_WORDS(ix0,ix1,d) \ 74 do { \ 75 ieee_double_shape_type ew_u; \ 76 ew_u.value = (d); \ 77 (ix0) = ew_u.parts.msw; \ 78 (ix1) = ew_u.parts.lsw; \ 79 } while (0) 80 81 /* Get the more significant 32 bit int from a double. */ 82 83 #ifndef GET_HIGH_WORD 84 # define GET_HIGH_WORD(i,d) \ 85 do { \ 86 ieee_double_shape_type gh_u; \ 87 gh_u.value = (d); \ 88 (i) = gh_u.parts.msw; \ 89 } while (0) 90 #endif 91 92 /* Get the less significant 32 bit int from a double. */ 93 94 #ifndef GET_LOW_WORD 95 # define GET_LOW_WORD(i,d) \ 96 do { \ 97 ieee_double_shape_type gl_u; \ 98 gl_u.value = (d); \ 99 (i) = gl_u.parts.lsw; \ 100 } while (0) 101 #endif 102 103 /* Get all in one, efficient on 64-bit machines. */ 104 #ifndef EXTRACT_WORDS64 105 # define EXTRACT_WORDS64(i,d) \ 106 do { \ 107 ieee_double_shape_type gh_u; \ 108 gh_u.value = (d); \ 109 (i) = gh_u.word; \ 110 } while (0) 111 #endif 112 113 /* Set a double from two 32 bit ints. */ 114 #ifndef INSERT_WORDS 115 # define INSERT_WORDS(d,ix0,ix1) \ 116 do { \ 117 ieee_double_shape_type iw_u; \ 118 iw_u.parts.msw = (ix0); \ 119 iw_u.parts.lsw = (ix1); \ 120 (d) = iw_u.value; \ 121 } while (0) 122 #endif 123 124 /* Get all in one, efficient on 64-bit machines. */ 125 #ifndef INSERT_WORDS64 126 # define INSERT_WORDS64(d,i) \ 127 do { \ 128 ieee_double_shape_type iw_u; \ 129 iw_u.word = (i); \ 130 (d) = iw_u.value; \ 131 } while (0) 132 #endif 133 134 /* Set the more significant 32 bits of a double from an int. */ 135 #ifndef SET_HIGH_WORD 136 #define SET_HIGH_WORD(d,v) \ 137 do { \ 138 ieee_double_shape_type sh_u; \ 139 sh_u.value = (d); \ 140 sh_u.parts.msw = (v); \ 141 (d) = sh_u.value; \ 142 } while (0) 143 #endif 144 145 /* Set the less significant 32 bits of a double from an int. */ 146 #ifndef SET_LOW_WORD 147 # define SET_LOW_WORD(d,v) \ 148 do { \ 149 ieee_double_shape_type sl_u; \ 150 sl_u.value = (d); \ 151 sl_u.parts.lsw = (v); \ 152 (d) = sl_u.value; \ 153 } while (0) 154 #endif 155 156 /* We need to guarantee an expansion of name when building 157 ldbl-128 files as another type (e.g _Float128). */ 158 #define mathx_hidden_def(name) hidden_def(name) 159 160 /* Get long double macros from a separate header. */ 161 #include <math_ldbl.h> 162 163 /* Include function declarations for each floating-point. */ 164 #define _Mdouble_ double 165 #define _MSUF_ 166 #include <math_private_calls.h> 167 #undef _MSUF_ 168 #undef _Mdouble_ 169 170 #define _Mdouble_ float 171 #define _MSUF_ f 172 #define __MATH_DECLARING_FLOAT 173 #include <math_private_calls.h> 174 #undef __MATH_DECLARING_FLOAT 175 #undef _MSUF_ 176 #undef _Mdouble_ 177 178 #define _Mdouble_ long double 179 #define _MSUF_ l 180 #define __MATH_DECLARING_LONG_DOUBLE 181 #include <math_private_calls.h> 182 #undef __MATH_DECLARING_LONG_DOUBLE 183 #undef _MSUF_ 184 #undef _Mdouble_ 185 186 #if __HAVE_DISTINCT_FLOAT128 187 # define _Mdouble_ _Float128 188 # define _MSUF_ f128 189 # define __MATH_DECLARING_FLOATN 190 # include <math_private_calls.h> 191 # undef __MATH_DECLARING_FLOATN 192 # undef _MSUF_ 193 # undef _Mdouble_ 194 #endif 195 196 197 198 /* Prototypes for functions of the IBM Accurate Mathematical Library. */ 199 extern double __sin (double __x); 200 extern double __cos (double __x); 201 extern int __branred (double __x, double *__a, double *__aa); 202 203 #endif /* _MATH_PRIVATE_H_ */ 204