nsz Git - musl/blob - src/internal/libm.h

   1 /* origin: FreeBSD /usr/src/lib/msun/src/math_private.h */
   2 /*
   3  * ====================================================
   4  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
   5  *
   6  * Developed at SunPro, a Sun Microsystems, Inc. business.
   7  * Permission to use, copy, modify, and distribute this
   8  * software is freely granted, provided that this notice
   9  * is preserved.
  10  * ====================================================
  11  */
  12
  13 #ifndef _LIBM_H
  14 #define _LIBM_H
  15
  16 #include <stdint.h>
  17 #include <float.h>
  18 #include <math.h>
  19 #include <complex.h>
  20 #include <endian.h>
  21
  22 #include "libc.h"
  23
  24 #if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
  25 #elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384 && __BYTE_ORDER == __LITTLE_ENDIAN
  26 union ldshape {
  27         long double f;
  28         struct {
  29                 uint64_t m;
  30                 uint16_t se;
  31         } i;
  32 };
  33 #elif LDBL_MANT_DIG == 113 && LDBL_MAX_EXP == 16384 && __BYTE_ORDER == __LITTLE_ENDIAN
  34 union ldshape {
  35         long double f;
  36         struct {
  37                 uint64_t lo;
  38                 uint32_t mid;
  39                 uint16_t top;
  40                 uint16_t se;
  41         } i;
  42         struct {
  43                 uint64_t lo;
  44                 uint64_t hi;
  45         } i2;
  46 };
  47 #else
  48 #error Unsupported long double representation
  49 #endif
  50
  51 #define FORCE_EVAL(x) do {                        \
  52         if (sizeof(x) == sizeof(float)) {         \
  53                 volatile float __x;               \
  54                 __x = (x);                        \
  55         } else if (sizeof(x) == sizeof(double)) { \
  56                 volatile double __x;              \
  57                 __x = (x);                        \
  58         } else {                                  \
  59                 volatile long double __x;         \
  60                 __x = (x);                        \
  61         }                                         \
  62 } while(0)
  63
  64 /* Get two 32 bit ints from a double.  */
  65 #define EXTRACT_WORDS(hi,lo,d)                    \
  66 do {                                              \
  67   union {double f; uint64_t i;} __u;              \
  68   __u.f = (d);                                    \
  69   (hi) = __u.i >> 32;                             \
  70   (lo) = (uint32_t)__u.i;                         \
  71 } while (0)
  72
  73 /* Get the more significant 32 bit int from a double.  */
  74 #define GET_HIGH_WORD(hi,d)                       \
  75 do {                                              \
  76   union {double f; uint64_t i;} __u;              \
  77   __u.f = (d);                                    \
  78   (hi) = __u.i >> 32;                             \
  79 } while (0)
  80
  81 /* Get the less significant 32 bit int from a double.  */
  82 #define GET_LOW_WORD(lo,d)                        \
  83 do {                                              \
  84   union {double f; uint64_t i;} __u;              \
  85   __u.f = (d);                                    \
  86   (lo) = (uint32_t)__u.i;                         \
  87 } while (0)
  88
  89 /* Set a double from two 32 bit ints.  */
  90 #define INSERT_WORDS(d,hi,lo)                     \
  91 do {                                              \
  92   union {double f; uint64_t i;} __u;              \
  93   __u.i = ((uint64_t)(hi)<<32) | (uint32_t)(lo);  \
  94   (d) = __u.f;                                    \
  95 } while (0)
  96
  97 /* Set the more significant 32 bits of a double from an int.  */
  98 #define SET_HIGH_WORD(d,hi)                       \
  99 do {                                              \
 100   union {double f; uint64_t i;} __u;              \
 101   __u.f = (d);                                    \
 102   __u.i &= 0xffffffff;                            \
 103   __u.i |= (uint64_t)(hi) << 32;                  \
 104   (d) = __u.f;                                    \
 105 } while (0)
 106
 107 /* Set the less significant 32 bits of a double from an int.  */
 108 #define SET_LOW_WORD(d,lo)                        \
 109 do {                                              \
 110   union {double f; uint64_t i;} __u;              \
 111   __u.f = (d);                                    \
 112   __u.i &= 0xffffffff00000000ull;                 \
 113   __u.i |= (uint32_t)(lo);                        \
 114   (d) = __u.f;                                    \
 115 } while (0)
 116
 117 /* Get a 32 bit int from a float.  */
 118 #define GET_FLOAT_WORD(w,d)                       \
 119 do {                                              \
 120   union {float f; uint32_t i;} __u;               \
 121   __u.f = (d);                                    \
 122   (w) = __u.i;                                    \
 123 } while (0)
 124
 125 /* Set a float from a 32 bit int.  */
 126 #define SET_FLOAT_WORD(d,w)                       \
 127 do {                                              \
 128   union {float f; uint32_t i;} __u;               \
 129   __u.i = (w);                                    \
 130   (d) = __u.f;                                    \
 131 } while (0)
 132
 133 /* fdlibm kernel functions */
 134
 135 int    __rem_pio2_large(double*,double*,int,int,int);
 136
 137 int    __rem_pio2(double,double*);
 138 double __sin(double,double,int);
 139 double __cos(double,double);
 140 double __tan(double,double,int);
 141 double __expo2(double);
 142 double complex __ldexp_cexp(double complex,int);
 143
 144 int    __rem_pio2f(float,double*);
 145 float  __sindf(double);
 146 float  __cosdf(double);
 147 float  __tandf(double,int);
 148 float  __expo2f(float);
 149 float complex __ldexp_cexpf(float complex,int);
 150
 151 int __rem_pio2l(long double, long double *);
 152 long double __sinl(long double, long double, int);
 153 long double __cosl(long double, long double);
 154 long double __tanl(long double, long double, int);
 155
 156 /* polynomial evaluation */
 157 long double __polevll(long double, const long double *, int);
 158 long double __p1evll(long double, const long double *, int);
 159
 160 #if 0
 161 /* Attempt to get strict C99 semantics for assignment with non-C99 compilers. */
 162 #define STRICT_ASSIGN(type, lval, rval) do {    \
 163         volatile type __v = (rval);             \
 164         (lval) = __v;                           \
 165 } while (0)
 166 #else
 167 /* Should work with -fexcess-precision=standard (>=gcc-4.5) or -ffloat-store */
 168 #define STRICT_ASSIGN(type, lval, rval) ((lval) = (type)(rval))
 169 #endif
 170
 171 #endif