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 * $NetBSD: math_private.h,v 1.12 2005/07/21 12:55:58 christos Exp $ 15 */ 16 17 #ifndef _MATH_PRIVATE_H_ 18 #define _MATH_PRIVATE_H_ 19 20 #include <sys/types.h> 21 22 /* The original fdlibm code used statements like: 23 n0 = ((*(int*)&one)>>29)^1; * index of high word * 24 ix0 = *(n0+(int*)&x); * high word of x * 25 ix1 = *((1-n0)+(int*)&x); * low word of x * 26 to dig two 32 bit words out of the 64 bit IEEE floating point 27 value. That is non-ANSI, and, moreover, the gcc instruction 28 scheduler gets it wrong. We instead use the following macros. 29 Unlike the original code, we determine the endianness at compile 30 time, not at run time; I don't see much benefit to selecting 31 endianness at run time. */ 32 33 /* A union which permits us to convert between a double and two 32 bit 34 ints. */ 35 36 /* 37 * The ARM ports are little endian except for the FPA word order which is 38 * big endian. 39 */ 40 41 #if (BYTE_ORDER == BIG_ENDIAN) || (defined(__arm__) && !defined(__VFP_FP__)) 42 43 typedef union 44 { 45 double value; 46 struct 47 { 48 u_int32_t msw; 49 u_int32_t lsw; 50 } parts; 51 } ieee_double_shape_type; 52 53 #endif 54 55 #if (BYTE_ORDER == LITTLE_ENDIAN) && \ 56 !(defined(__arm__) && !defined(__VFP_FP__)) 57 58 typedef union 59 { 60 double value; 61 struct 62 { 63 u_int32_t lsw; 64 u_int32_t msw; 65 } parts; 66 } ieee_double_shape_type; 67 68 #endif 69 70 /* Get two 32 bit ints from a double. */ 71 72 #define EXTRACT_WORDS(ix0,ix1,d) \ 73 do { \ 74 ieee_double_shape_type ew_u; \ 75 ew_u.value = (d); \ 76 (ix0) = ew_u.parts.msw; \ 77 (ix1) = ew_u.parts.lsw; \ 78 } while (0) 79 80 /* Get the more significant 32 bit int from a double. */ 81 82 #define GET_HIGH_WORD(i,d) \ 83 do { \ 84 ieee_double_shape_type gh_u; \ 85 gh_u.value = (d); \ 86 (i) = gh_u.parts.msw; \ 87 } while (0) 88 89 /* Get the less significant 32 bit int from a double. */ 90 91 #define GET_LOW_WORD(i,d) \ 92 do { \ 93 ieee_double_shape_type gl_u; \ 94 gl_u.value = (d); \ 95 (i) = gl_u.parts.lsw; \ 96 } while (0) 97 98 /* Set a double from two 32 bit ints. */ 99 100 #define INSERT_WORDS(d,ix0,ix1) \ 101 do { \ 102 ieee_double_shape_type iw_u; \ 103 iw_u.parts.msw = (ix0); \ 104 iw_u.parts.lsw = (ix1); \ 105 (d) = iw_u.value; \ 106 } while (0) 107 108 /* Set the more significant 32 bits of a double from an int. */ 109 110 #define SET_HIGH_WORD(d,v) \ 111 do { \ 112 ieee_double_shape_type sh_u; \ 113 sh_u.value = (d); \ 114 sh_u.parts.msw = (v); \ 115 (d) = sh_u.value; \ 116 } while (0) 117 118 /* Set the less significant 32 bits of a double from an int. */ 119 120 #define SET_LOW_WORD(d,v) \ 121 do { \ 122 ieee_double_shape_type sl_u; \ 123 sl_u.value = (d); \ 124 sl_u.parts.lsw = (v); \ 125 (d) = sl_u.value; \ 126 } while (0) 127 128 /* A union which permits us to convert between a float and a 32 bit 129 int. */ 130 131 typedef union 132 { 133 float value; 134 u_int32_t word; 135 } ieee_float_shape_type; 136 137 /* Get a 32 bit int from a float. */ 138 139 #define GET_FLOAT_WORD(i,d) \ 140 do { \ 141 ieee_float_shape_type gf_u; \ 142 gf_u.value = (d); \ 143 (i) = gf_u.word; \ 144 } while (0) 145 146 /* Set a float from a 32 bit int. */ 147 148 #define SET_FLOAT_WORD(d,i) \ 149 do { \ 150 ieee_float_shape_type sf_u; \ 151 sf_u.word = (i); \ 152 (d) = sf_u.value; \ 153 } while (0) 154 155 /* ieee style elementary functions */ 156 extern double __ieee754_sqrt (double); 157 extern double __ieee754_acos (double); 158 extern double __ieee754_acosh (double); 159 extern double __ieee754_log (double); 160 extern double __ieee754_atanh (double); 161 extern double __ieee754_asin (double); 162 extern double __ieee754_atan2 (double, double); 163 extern double __ieee754_exp (double); 164 extern double __ieee754_cosh (double); 165 extern double __ieee754_fmod (double, double); 166 extern double __ieee754_pow (double, double); 167 extern double __ieee754_lgamma_r (double, int *); 168 extern double __ieee754_gamma_r (double, int *); 169 extern double __ieee754_lgamma (double); 170 extern double __ieee754_gamma (double); 171 extern double __ieee754_log10 (double); 172 extern double __ieee754_log2 (double); 173 extern double __ieee754_sinh (double); 174 extern double __ieee754_hypot (double, double); 175 extern double __ieee754_j0 (double); 176 extern double __ieee754_j1 (double); 177 extern double __ieee754_y0 (double); 178 extern double __ieee754_y1 (double); 179 extern double __ieee754_jn (int, double); 180 extern double __ieee754_yn (int, double); 181 extern double __ieee754_remainder (double, double); 182 extern int __ieee754_rem_pio2 (double,double*); 183 extern double __ieee754_scalb (double, double); 184 185 /* fdlibm kernel function */ 186 extern double __kernel_standard (double, double, int); 187 extern double __kernel_sin (double, double, int); 188 extern double __kernel_cos (double, double); 189 extern double __kernel_tan (double, double, int); 190 extern int __kernel_rem_pio2 (double*,double*,int,int,int,const int*); 191 192 193 ///* ieee style elementary float functions */ 194 //extern float __ieee754_sqrtf __P((float)); 195 //extern float __ieee754_acosf __P((float)); 196 //extern float __ieee754_acoshf __P((float)); 197 //extern float __ieee754_logf __P((float)); 198 //extern float __ieee754_atanhf __P((float)); 199 //extern float __ieee754_asinf __P((float)); 200 //extern float __ieee754_atan2f __P((float,float)); 201 //extern float __ieee754_expf __P((float)); 202 //extern float __ieee754_coshf __P((float)); 203 //extern float __ieee754_fmodf __P((float,float)); 204 //extern float __ieee754_powf __P((float,float)); 205 //extern float __ieee754_lgammaf_r __P((float,int *)); 206 //extern float __ieee754_gammaf_r __P((float,int *)); 207 //extern float __ieee754_lgammaf __P((float)); 208 //extern float __ieee754_gammaf __P((float)); 209 //extern float __ieee754_log10f __P((float)); 210 //extern float __ieee754_log2f __P((float)); 211 //extern float __ieee754_sinhf __P((float)); 212 //extern float __ieee754_hypotf __P((float,float)); 213 //extern float __ieee754_j0f __P((float)); 214 //extern float __ieee754_j1f __P((float)); 215 //extern float __ieee754_y0f __P((float)); 216 //extern float __ieee754_y1f __P((float)); 217 //extern float __ieee754_jnf __P((int,float)); 218 //extern float __ieee754_ynf __P((int,float)); 219 //extern float __ieee754_remainderf __P((float,float)); 220 //extern int __ieee754_rem_pio2f __P((float,float*)); 221 //extern float __ieee754_scalbf __P((float,float)); 222 223 ///* float versions of fdlibm kernel functions */ 224 //extern float __kernel_sinf __P((float,float,int)); 225 //extern float __kernel_cosf __P((float,float)); 226 //extern float __kernel_tanf __P((float,float,int)); 227 //extern int __kernel_rem_pio2f __P((float*,float*,int,int,int,const int*)); 228 229 #endif /* _MATH_PRIVATE_H_ */ 230
