lib/msun/src/math_private.h

   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  * $FreeBSD: src/lib/msun/src/math_private.h,v 1.6 1999/08/28 00:06:43 peter Exp $
  15  * $DragonFly: src/lib/msun/src/Attic/math_private.h,v 1.2 2003/06/17 04:26:53 dillon Exp $
  16  */
  17
  18 #ifndef _MATH_PRIVATE_H_
  19 #define _MATH_PRIVATE_H_
  20
  21 #include <machine/endian.h>
  22 #include <sys/types.h>
  23
  24 /* The original fdlibm code used statements like:
  25         n0 = ((*(int*)&one)>>29)^1;             * index of high word *
  26         ix0 = *(n0+(int*)&x);                   * high word of x *
  27         ix1 = *((1-n0)+(int*)&x);               * low word of x *
  28    to dig two 32 bit words out of the 64 bit IEEE floating point
  29    value.  That is non-ANSI, and, moreover, the gcc instruction
  30    scheduler gets it wrong.  We instead use the following macros.
  31    Unlike the original code, we determine the endianness at compile
  32    time, not at run time; I don't see much benefit to selecting
  33    endianness at run time.  */
  34
  35 /* A union which permits us to convert between a double and two 32 bit
  36    ints.  */
  37
  38 #if BYTE_ORDER == BIG_ENDIAN
  39
  40 typedef union
  41 {
  42   double value;
  43   struct
  44   {
  45     u_int32_t msw;
  46     u_int32_t lsw;
  47   } parts;
  48 } ieee_double_shape_type;
  49
  50 #endif
  51
  52 #if BYTE_ORDER == LITTLE_ENDIAN
  53
  54 typedef union
  55 {
  56   double value;
  57   struct
  58   {
  59     u_int32_t lsw;
  60     u_int32_t msw;
  61   } parts;
  62 } ieee_double_shape_type;
  63
  64 #endif
  65
  66 /* Get two 32 bit ints from a double.  */
  67
  68 #define EXTRACT_WORDS(ix0,ix1,d)                                \
  69 do {                                                            \
  70   ieee_double_shape_type ew_u;                                  \
  71   ew_u.value = (d);                                             \
  72   (ix0) = ew_u.parts.msw;                                       \
  73   (ix1) = ew_u.parts.lsw;                                       \
  74 } while (0)
  75
  76 /* Get the more significant 32 bit int from a double.  */
  77
  78 #define GET_HIGH_WORD(i,d)                                      \
  79 do {                                                            \
  80   ieee_double_shape_type gh_u;                                  \
  81   gh_u.value = (d);                                             \
  82   (i) = gh_u.parts.msw;                                         \
  83 } while (0)
  84
  85 /* Get the less significant 32 bit int from a double.  */
  86
  87 #define GET_LOW_WORD(i,d)                                       \
  88 do {                                                            \
  89   ieee_double_shape_type gl_u;                                  \
  90   gl_u.value = (d);                                             \
  91   (i) = gl_u.parts.lsw;                                         \
  92 } while (0)
  93
  94 /* Set a double from two 32 bit ints.  */
  95
  96 #define INSERT_WORDS(d,ix0,ix1)                                 \
  97 do {                                                            \
  98   ieee_double_shape_type iw_u;                                  \
  99   iw_u.parts.msw = (ix0);                                       \
 100   iw_u.parts.lsw = (ix1);                                       \
 101   (d) = iw_u.value;                                             \
 102 } while (0)
 103
 104 /* Set the more significant 32 bits of a double from an int.  */
 105
 106 #define SET_HIGH_WORD(d,v)                                      \
 107 do {                                                            \
 108   ieee_double_shape_type sh_u;                                  \
 109   sh_u.value = (d);                                             \
 110   sh_u.parts.msw = (v);                                         \
 111   (d) = sh_u.value;                                             \
 112 } while (0)
 113
 114 /* Set the less significant 32 bits of a double from an int.  */
 115
 116 #define SET_LOW_WORD(d,v)                                       \
 117 do {                                                            \
 118   ieee_double_shape_type sl_u;                                  \
 119   sl_u.value = (d);                                             \
 120   sl_u.parts.lsw = (v);                                         \
 121   (d) = sl_u.value;                                             \
 122 } while (0)
 123
 124 /* A union which permits us to convert between a float and a 32 bit
 125    int.  */
 126
 127 typedef union
 128 {
 129   float value;
 130   /* FIXME: Assumes 32 bit int.  */
 131   unsigned int word;
 132 } ieee_float_shape_type;
 133
 134 /* Get a 32 bit int from a float.  */
 135
 136 #define GET_FLOAT_WORD(i,d)                                     \
 137 do {                                                            \
 138   ieee_float_shape_type gf_u;                                   \
 139   gf_u.value = (d);                                             \
 140   (i) = gf_u.word;                                              \
 141 } while (0)
 142
 143 /* Set a float from a 32 bit int.  */
 144
 145 #define SET_FLOAT_WORD(d,i)                                     \
 146 do {                                                            \
 147   ieee_float_shape_type sf_u;                                   \
 148   sf_u.word = (i);                                              \
 149   (d) = sf_u.value;                                             \
 150 } while (0)
 151
 152 /* ieee style elementary functions */
 153 extern double __ieee754_sqrt __P((double));
 154 extern double __ieee754_acos __P((double));
 155 extern double __ieee754_acosh __P((double));
 156 extern double __ieee754_log __P((double));
 157 extern double __ieee754_atanh __P((double));
 158 extern double __ieee754_asin __P((double));
 159 extern double __ieee754_atan2 __P((double,double));
 160 extern double __ieee754_exp __P((double));
 161 extern double __ieee754_cosh __P((double));
 162 extern double __ieee754_fmod __P((double,double));
 163 extern double __ieee754_pow __P((double,double));
 164 extern double __ieee754_lgamma_r __P((double,int *));
 165 extern double __ieee754_gamma_r __P((double,int *));
 166 extern double __ieee754_lgamma __P((double));
 167 extern double __ieee754_gamma __P((double));
 168 extern double __ieee754_log10 __P((double));
 169 extern double __ieee754_sinh __P((double));
 170 extern double __ieee754_hypot __P((double,double));
 171 extern double __ieee754_j0 __P((double));
 172 extern double __ieee754_j1 __P((double));
 173 extern double __ieee754_y0 __P((double));
 174 extern double __ieee754_y1 __P((double));
 175 extern double __ieee754_jn __P((int,double));
 176 extern double __ieee754_yn __P((int,double));
 177 extern double __ieee754_remainder __P((double,double));
 178 extern int    __ieee754_rem_pio2 __P((double,double*));
 179 extern double __ieee754_scalb __P((double,double));
 180
 181 /* fdlibm kernel function */
 182 extern double __kernel_standard __P((double,double,int));
 183 extern double __kernel_sin __P((double,double,int));
 184 extern double __kernel_cos __P((double,double));
 185 extern double __kernel_tan __P((double,double,int));
 186 extern int    __kernel_rem_pio2 __P((double*,double*,int,int,int,const int*));
 187
 188
 189 /* ieee style elementary float functions */
 190 extern float __ieee754_sqrtf __P((float));
 191 extern float __ieee754_acosf __P((float));
 192 extern float __ieee754_acoshf __P((float));
 193 extern float __ieee754_logf __P((float));
 194 extern float __ieee754_atanhf __P((float));
 195 extern float __ieee754_asinf __P((float));
 196 extern float __ieee754_atan2f __P((float,float));
 197 extern float __ieee754_expf __P((float));
 198 extern float __ieee754_coshf __P((float));
 199 extern float __ieee754_fmodf __P((float,float));
 200 extern float __ieee754_powf __P((float,float));
 201 extern float __ieee754_lgammaf_r __P((float,int *));
 202 extern float __ieee754_gammaf_r __P((float,int *));
 203 extern float __ieee754_lgammaf __P((float));
 204 extern float __ieee754_gammaf __P((float));
 205 extern float __ieee754_log10f __P((float));
 206 extern float __ieee754_sinhf __P((float));
 207 extern float __ieee754_hypotf __P((float,float));
 208 extern float __ieee754_j0f __P((float));
 209 extern float __ieee754_j1f __P((float));
 210 extern float __ieee754_y0f __P((float));
 211 extern float __ieee754_y1f __P((float));
 212 extern float __ieee754_jnf __P((int,float));
 213 extern float __ieee754_ynf __P((int,float));
 214 extern float __ieee754_remainderf __P((float,float));
 215 extern int   __ieee754_rem_pio2f __P((float,float*));
 216 extern float __ieee754_scalbf __P((float,float));
 217
 218 /* float versions of fdlibm kernel functions */
 219 extern float __kernel_sinf __P((float,float,int));
 220 extern float __kernel_cosf __P((float,float));
 221 extern float __kernel_tanf __P((float,float,int));
 222 extern int   __kernel_rem_pio2f __P((float*,float*,int,int,int,const int*));
 223
 224 #ifdef  __alpha__
 225 #define __generic___ieee754_acos        __ieee754_acos
 226 #define __generic___ieee754_asin        __ieee754_asin
 227 #define __generic___ieee754_atan2       __ieee754_atan2
 228 #define __generic___ieee754_exp         __ieee754_exp
 229 #define __generic___ieee754_fmod        __ieee754_fmod
 230 #define __generic___ieee754_log         __ieee754_log
 231 #define __generic___ieee754_log10       __ieee754_log10
 232 #define __generic___ieee754_remainder   __ieee754_remainder
 233 #define __generic___ieee754_scalb       __ieee754_scalb
 234 #define __generic___ieee754_sqrt        __ieee754_sqrt
 235 #define __generic_atan                  atan
 236 #define __generic_ceil                  ceil
 237 #define __generic_copysign              copysign
 238 #define __generic_cos                   cos
 239 #define __generic_finite                finite
 240 #define __generic_floor                 floor
 241 #define __generic_ilogb                 ilogb
 242 #define __generic_log1p                 log1p
 243 #define __generic_logb                  logb
 244 #define __generic_rint                  rint
 245 #define __generic_scalbn                scalbn
 246 #define __generic_significand           significand
 247 #define __generic_sin                   sin
 248 #define __generic_tan                   tan
 249 #endif
 250
 251 #endif /* _MATH_PRIVATE_H_ */