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| 2 | pj | 1 | /* |
| 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 | |||
| 12 | /* |
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| 13 | * from: @(#)fdlibm.h 5.1 93/09/24 |
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| 14 | * $\Id: math_private.h,v 1.2 1995/05/30 05:49:17 rgrimes Exp $ |
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| 15 | */ |
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| 16 | |||
| 17 | #ifndef _MATH_PRIVATE_H_ |
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| 18 | #define _MATH_PRIVATE_H_ |
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| 19 | |||
| 20 | #include <machine/endian.h> |
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| 21 | #include <sys/types.h> |
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| 22 | |||
| 23 | /* The original fdlibm code used statements like: |
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| 24 | n0 = ((*(int*)&one)>>29)^1; * index of high word * |
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| 25 | ix0 = *(n0+(int*)&x); * high word of x * |
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| 26 | ix1 = *((1-n0)+(int*)&x); * low word of x * |
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| 27 | to dig two 32 bit words out of the 64 bit IEEE floating point |
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| 28 | value. That is non-ANSI, and, moreover, the gcc instruction |
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| 29 | scheduler gets it wrong. We instead use the following macros. |
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| 30 | Unlike the original code, we determine the endianness at compile |
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| 31 | time, not at run time; I don't see much benefit to selecting |
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| 32 | endianness at run time. */ |
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| 33 | |||
| 34 | /* A union which permits us to convert between a double and two 32 bit |
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| 35 | ints. */ |
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| 36 | |||
| 37 | #if BYTE_ORDER == BIG_ENDIAN |
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| 38 | |||
| 39 | typedef union |
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| 40 | { |
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| 41 | double value; |
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| 42 | struct |
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| 43 | { |
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| 44 | u_int32_t msw; |
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| 45 | u_int32_t lsw; |
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| 46 | } parts; |
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| 47 | } ieee_double_shape_type; |
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| 48 | |||
| 49 | #endif |
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| 50 | |||
| 51 | #if BYTE_ORDER == 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 | u_int32_t lsw; |
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| 59 | u_int32_t msw; |
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| 60 | } parts; |
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| 61 | } ieee_double_shape_type; |
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| 62 | |||
| 63 | #endif |
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| 64 | |||
| 65 | /* Get two 32 bit ints from a double. */ |
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| 66 | |||
| 67 | #define EXTRACT_WORDS(ix0,ix1,d) \ |
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| 68 | do { \ |
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| 69 | ieee_double_shape_type ew_u; \ |
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| 70 | ew_u.value = (d); \ |
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| 71 | (ix0) = ew_u.parts.msw; \ |
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| 72 | (ix1) = ew_u.parts.lsw; \ |
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| 73 | } while (0) |
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| 74 | |||
| 75 | /* Get the more significant 32 bit int from a double. */ |
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| 76 | |||
| 77 | #define GET_HIGH_WORD(i,d) \ |
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| 78 | do { \ |
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| 79 | ieee_double_shape_type gh_u; \ |
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| 80 | gh_u.value = (d); \ |
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| 81 | (i) = gh_u.parts.msw; \ |
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| 82 | } while (0) |
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| 83 | |||
| 84 | /* Get the less significant 32 bit int from a double. */ |
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| 85 | |||
| 86 | #define GET_LOW_WORD(i,d) \ |
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| 87 | do { \ |
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| 88 | ieee_double_shape_type gl_u; \ |
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| 89 | gl_u.value = (d); \ |
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| 90 | (i) = gl_u.parts.lsw; \ |
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| 91 | } while (0) |
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| 92 | |||
| 93 | /* Set a double from two 32 bit ints. */ |
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| 94 | |||
| 95 | #define INSERT_WORDS(d,ix0,ix1) \ |
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| 96 | do { \ |
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| 97 | ieee_double_shape_type iw_u; \ |
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| 98 | iw_u.parts.msw = (ix0); \ |
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| 99 | iw_u.parts.lsw = (ix1); \ |
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| 100 | (d) = iw_u.value; \ |
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| 101 | } while (0) |
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| 102 | |||
| 103 | /* Set the more significant 32 bits of a double from an int. */ |
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| 104 | |||
| 105 | #define SET_HIGH_WORD(d,v) \ |
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| 106 | do { \ |
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| 107 | ieee_double_shape_type sh_u; \ |
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| 108 | sh_u.value = (d); \ |
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| 109 | sh_u.parts.msw = (v); \ |
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| 110 | (d) = sh_u.value; \ |
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| 111 | } while (0) |
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| 112 | |||
| 113 | /* Set the less significant 32 bits of a double from an int. */ |
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| 114 | |||
| 115 | #define SET_LOW_WORD(d,v) \ |
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| 116 | do { \ |
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| 117 | ieee_double_shape_type sl_u; \ |
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| 118 | sl_u.value = (d); \ |
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| 119 | sl_u.parts.lsw = (v); \ |
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| 120 | (d) = sl_u.value; \ |
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| 121 | } while (0) |
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| 122 | |||
| 123 | /* A union which permits us to convert between a float and a 32 bit |
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| 124 | int. */ |
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| 125 | |||
| 126 | typedef union |
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| 127 | { |
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| 128 | float value; |
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| 129 | /* FIXME: Assumes 32 bit int. */ |
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| 130 | unsigned int word; |
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| 131 | } ieee_float_shape_type; |
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| 132 | |||
| 133 | /* Get a 32 bit int from a float. */ |
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| 134 | |||
| 135 | #define GET_FLOAT_WORD(i,d) \ |
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| 136 | do { \ |
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| 137 | ieee_float_shape_type gf_u; \ |
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| 138 | gf_u.value = (d); \ |
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| 139 | (i) = gf_u.word; \ |
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| 140 | } while (0) |
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| 141 | |||
| 142 | /* Set a float from a 32 bit int. */ |
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| 143 | |||
| 144 | #define SET_FLOAT_WORD(d,i) \ |
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| 145 | do { \ |
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| 146 | ieee_float_shape_type sf_u; \ |
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| 147 | sf_u.word = (i); \ |
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| 148 | (d) = sf_u.value; \ |
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| 149 | } while (0) |
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| 150 | |||
| 151 | /* ieee style elementary functions */ |
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| 152 | extern double __ieee754_sqrt __P((double)); |
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| 153 | extern double __ieee754_acos __P((double)); |
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| 154 | extern double __ieee754_acosh __P((double)); |
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| 155 | extern double __ieee754_log __P((double)); |
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| 156 | extern double __ieee754_atanh __P((double)); |
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| 157 | extern double __ieee754_asin __P((double)); |
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| 158 | extern double __ieee754_atan2 __P((double,double)); |
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| 159 | extern double __ieee754_exp __P((double)); |
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| 160 | extern double __ieee754_cosh __P((double)); |
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| 161 | extern double __ieee754_fmod __P((double,double)); |
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| 162 | extern double __ieee754_pow __P((double,double)); |
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| 163 | extern double __ieee754_lgamma_r __P((double,int *)); |
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| 164 | extern double __ieee754_gamma_r __P((double,int *)); |
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| 165 | extern double __ieee754_lgamma __P((double)); |
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| 166 | extern double __ieee754_gamma __P((double)); |
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| 167 | extern double __ieee754_log10 __P((double)); |
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| 168 | extern double __ieee754_sinh __P((double)); |
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| 169 | extern double __ieee754_hypot __P((double,double)); |
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| 170 | extern double __ieee754_j0 __P((double)); |
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| 171 | extern double __ieee754_j1 __P((double)); |
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| 172 | extern double __ieee754_y0 __P((double)); |
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| 173 | extern double __ieee754_y1 __P((double)); |
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| 174 | extern double __ieee754_jn __P((int,double)); |
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| 175 | extern double __ieee754_yn __P((int,double)); |
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| 176 | extern double __ieee754_remainder __P((double,double)); |
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| 177 | extern int __ieee754_rem_pio2 __P((double,double*)); |
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| 178 | extern double __ieee754_scalb __P((double,double)); |
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| 179 | |||
| 180 | /* fdlibm kernel function */ |
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| 181 | extern double __kernel_standard __P((double,double,int)); |
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| 182 | extern double __kernel_sin __P((double,double,int)); |
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| 183 | extern double __kernel_cos __P((double,double)); |
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| 184 | extern double __kernel_tan __P((double,double,int)); |
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| 185 | extern int __kernel_rem_pio2 __P((double*,double*,int,int,int,const int*)); |
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| 186 | |||
| 187 | |||
| 188 | /* ieee style elementary float functions */ |
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| 189 | extern float __ieee754_sqrtf __P((float)); |
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| 190 | extern float __ieee754_acosf __P((float)); |
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| 191 | extern float __ieee754_acoshf __P((float)); |
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| 192 | extern float __ieee754_logf __P((float)); |
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| 193 | extern float __ieee754_atanhf __P((float)); |
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| 194 | extern float __ieee754_asinf __P((float)); |
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| 195 | extern float __ieee754_atan2f __P((float,float)); |
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| 196 | extern float __ieee754_expf __P((float)); |
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| 197 | extern float __ieee754_coshf __P((float)); |
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| 198 | extern float __ieee754_fmodf __P((float,float)); |
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| 199 | extern float __ieee754_powf __P((float,float)); |
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| 200 | extern float __ieee754_lgammaf_r __P((float,int *)); |
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| 201 | extern float __ieee754_gammaf_r __P((float,int *)); |
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| 202 | extern float __ieee754_lgammaf __P((float)); |
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| 203 | extern float __ieee754_gammaf __P((float)); |
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| 204 | extern float __ieee754_log10f __P((float)); |
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| 205 | extern float __ieee754_sinhf __P((float)); |
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| 206 | extern float __ieee754_hypotf __P((float,float)); |
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| 207 | extern float __ieee754_j0f __P((float)); |
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| 208 | extern float __ieee754_j1f __P((float)); |
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| 209 | extern float __ieee754_y0f __P((float)); |
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| 210 | extern float __ieee754_y1f __P((float)); |
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| 211 | extern float __ieee754_jnf __P((int,float)); |
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| 212 | extern float __ieee754_ynf __P((int,float)); |
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| 213 | extern float __ieee754_remainderf __P((float,float)); |
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| 214 | extern int __ieee754_rem_pio2f __P((float,float*)); |
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| 215 | extern float __ieee754_scalbf __P((float,float)); |
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| 216 | |||
| 217 | /* float versions of fdlibm kernel functions */ |
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| 218 | extern float __kernel_sinf __P((float,float,int)); |
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| 219 | extern float __kernel_cosf __P((float,float)); |
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| 220 | extern float __kernel_tanf __P((float,float,int)); |
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| 221 | extern int __kernel_rem_pio2f __P((float*,float*,int,int,int,const int*)); |
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| 222 | |||
| 223 | #endif /* _MATH_PRIVATE_H_ */ |