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  * $FreeBSD$
  15  */
  16
  17 #ifndef _MATH_PRIVATE_H_
  18 #define _MATH_PRIVATE_H_
  19
  20 #include <sys/types.h>
  21 #include <machine/endian.h>
  22
  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
  36 /*
  37  * A union which permits us to convert between a double and two 32 bit
  38  * ints.
  39  */
  40
  41 #if BYTE_ORDER == BIG_ENDIAN
  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
  57 typedef union
  58 {
  59   double value;
  60   struct
  61   {
  62     u_int32_t lsw;
  63     u_int32_t msw;
  64   } parts;
  65 } ieee_double_shape_type;
  66
  67 #endif
  68
  69 /* Get two 32 bit ints from a double.  */
  70
  71 #define EXTRACT_WORDS(ix0,ix1,d)                                \
  72 do {                                                            \
  73   ieee_double_shape_type ew_u;                                  \
  74   ew_u.value = (d);                                             \
  75   (ix0) = ew_u.parts.msw;                                       \
  76   (ix1) = ew_u.parts.lsw;                                       \
  77 } while (0)
  78
  79 /* Get the more significant 32 bit int from a double.  */
  80
  81 #define GET_HIGH_WORD(i,d)                                      \
  82 do {                                                            \
  83   ieee_double_shape_type gh_u;                                  \
  84   gh_u.value = (d);                                             \
  85   (i) = gh_u.parts.msw;                                         \
  86 } while (0)
  87
  88 /* Get the less significant 32 bit int from a double.  */
  89
  90 #define GET_LOW_WORD(i,d)                                       \
  91 do {                                                            \
  92   ieee_double_shape_type gl_u;                                  \
  93   gl_u.value = (d);                                             \
  94   (i) = gl_u.parts.lsw;                                         \
  95 } while (0)
  96
  97 /* Set a double from two 32 bit ints.  */
  98
  99 #define INSERT_WORDS(d,ix0,ix1)                                 \
 100 do {                                                            \
 101   ieee_double_shape_type iw_u;                                  \
 102   iw_u.parts.msw = (ix0);                                       \
 103   iw_u.parts.lsw = (ix1);                                       \
 104   (d) = iw_u.value;                                             \
 105 } while (0)
 106
 107 /* Set the more significant 32 bits of a double from an int.  */
 108
 109 #define SET_HIGH_WORD(d,v)                                      \
 110 do {                                                            \
 111   ieee_double_shape_type sh_u;                                  \
 112   sh_u.value = (d);                                             \
 113   sh_u.parts.msw = (v);                                         \
 114   (d) = sh_u.value;                                             \
 115 } while (0)
 116
 117 /* Set the less significant 32 bits of a double from an int.  */
 118
 119 #define SET_LOW_WORD(d,v)                                       \
 120 do {                                                            \
 121   ieee_double_shape_type sl_u;                                  \
 122   sl_u.value = (d);                                             \
 123   sl_u.parts.lsw = (v);                                         \
 124   (d) = sl_u.value;                                             \
 125 } while (0)
 126
 127 /*
 128  * A union which permits us to convert between a float and a 32 bit
 129  * int.
 130  */
 131
 132 typedef union
 133 {
 134   float value;
 135   /* FIXME: Assumes 32 bit int.  */
 136   unsigned int word;
 137 } ieee_float_shape_type;
 138
 139 /* Get a 32 bit int from a float.  */
 140
 141 #define GET_FLOAT_WORD(i,d)                                     \
 142 do {                                                            \
 143   ieee_float_shape_type gf_u;                                   \
 144   gf_u.value = (d);                                             \
 145   (i) = gf_u.word;                                              \
 146 } while (0)
 147
 148 /* Set a float from a 32 bit int.  */
 149
 150 #define SET_FLOAT_WORD(d,i)                                     \
 151 do {                                                            \
 152   ieee_float_shape_type sf_u;                                   \
 153   sf_u.word = (i);                                              \
 154   (d) = sf_u.value;                                             \
 155 } while (0)
 156
 157 /* ieee style elementary functions */
 158 double  __ieee754_sqrt(double);
 159 double  __ieee754_acos(double);
 160 double  __ieee754_acosh(double);
 161 double  __ieee754_log(double);
 162 double  __ieee754_atanh(double);
 163 double  __ieee754_asin(double);
 164 double  __ieee754_atan2(double,double);
 165 double  __ieee754_exp(double);
 166 double  __ieee754_cosh(double);
 167 double  __ieee754_fmod(double,double);
 168 double  __ieee754_pow(double,double);
 169 double  __ieee754_lgamma_r(double,int *);
 170 double  __ieee754_gamma_r(double,int *);
 171 double  __ieee754_lgamma(double);
 172 double  __ieee754_gamma(double);
 173 double  __ieee754_log10(double);
 174 double  __ieee754_sinh(double);
 175 double  __ieee754_hypot(double,double);
 176 double  __ieee754_j0(double);
 177 double  __ieee754_j1(double);
 178 double  __ieee754_y0(double);
 179 double  __ieee754_y1(double);
 180 double  __ieee754_jn(int,double);
 181 double  __ieee754_yn(int,double);
 182 double  __ieee754_remainder(double,double);
 183 int     __ieee754_rem_pio2(double,double*);
 184 double  __ieee754_scalb(double,double);
 185
 186 /* fdlibm kernel function */
 187 double  __kernel_standard(double,double,int);
 188 double  __kernel_sin(double,double,int);
 189 double  __kernel_cos(double,double);
 190 double  __kernel_tan(double,double,int);
 191 int     __kernel_rem_pio2(double*,double*,int,int,int,const int*);
 192
 193 /* ieee style elementary float functions */
 194 float   __ieee754_sqrtf(float);
 195 float   __ieee754_acosf(float);
 196 float   __ieee754_acoshf(float);
 197 float   __ieee754_logf(float);
 198 float   __ieee754_atanhf(float);
 199 float   __ieee754_asinf(float);
 200 float   __ieee754_atan2f(float,float);
 201 float   __ieee754_expf(float);
 202 float   __ieee754_coshf(float);
 203 float   __ieee754_fmodf(float,float);
 204 float   __ieee754_powf(float,float);
 205 float   __ieee754_lgammaf_r(float,int *);
 206 float   __ieee754_gammaf_r(float,int *);
 207 float   __ieee754_lgammaf(float);
 208 float   __ieee754_gammaf(float);
 209 float   __ieee754_log10f(float);
 210 float   __ieee754_sinhf(float);
 211 float   __ieee754_hypotf(float,float);
 212 float   __ieee754_j0f(float);
 213 float   __ieee754_j1f(float);
 214 float   __ieee754_y0f(float);
 215 float   __ieee754_y1f(float);
 216 float   __ieee754_jnf(int,float);
 217 float   __ieee754_ynf(int,float);
 218 float   __ieee754_remainderf(float,float);
 219 int     __ieee754_rem_pio2f(float,float*);
 220 float   __ieee754_scalbf(float,float);
 221
 222 /* float versions of fdlibm kernel functions */
 223 float   __kernel_sinf(float,float,int);
 224 float   __kernel_cosf(float,float);
 225 float   __kernel_tanf(float,float,int);
 226 int     __kernel_rem_pio2f(float*,float*,int,int,int,const int*);
 227
 228 #endif /* !_MATH_PRIVATE_H_ */