libquadmath/quadmath-imp.h

   1 /* GCC Quad-Precision Math Library
   2    Copyright (C) 2010 Free Software Foundation, Inc.
   3    Written by Francois-Xavier Coudert  <fxcoudert@gcc.gnu.org>
   4
   5 This file is part of the libiberty library.
   6 Libiberty is free software; you can redistribute it and/or
   7 modify it under the terms of the GNU Library General Public
   8 License as published by the Free Software Foundation; either
   9 version 2 of the License, or (at your option) any later version.
  10
  11 Libiberty is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 Library General Public License for more details.
  15
  16 You should have received a copy of the GNU Library General Public
  17 License along with libiberty; see the file COPYING.LIB.  If
  18 not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
  19 Boston, MA 02110-1301, USA.  */
  20
  21 #ifndef QUADMATH_IMP_H
  22 #define QUADMATH_IMP_H
  23
  24 #include <stdint.h>
  25 #include <stdlib.h>
  26 #include "quadmath.h"
  27
  28
  29 // Prototypes for internal functions
  30 extern int32_t __quadmath_rem_pio2q (__float128, __float128 *);
  31 extern void __quadmath_kernel_sincosq (__float128, __float128, __float128 *,
  32                                        __float128 *, int);
  33 extern __float128 __quadmath_kernel_sinq (__float128, __float128, int);
  34 extern __float128 __quadmath_kernel_cosq (__float128, __float128);
  35
  36
  37
  38 // Frankly, if you have __float128, you have 64-bit integers, right?
  39 #ifndef UINT64_C
  40 # error "No way!"
  41 #endif
  42
  43
  44 // If we don't have macros to know endianess, assume little endian
  45 #if !defined(__BIG_ENDIAN__) && !defined(__LITTLE_ENDIAN__)
  46 # define __LITTLE_ENDIAN__ 1
  47 #endif
  48
  49
  50 // Main union type we use to manipulate the floating-point type
  51 typedef union
  52 {
  53   __float128 value;
  54
  55   struct
  56   {
  57 #if __BIG_ENDIAN__
  58     unsigned negative:1;
  59     unsigned exponent:15;
  60     uint64_t mant_high:48;
  61     uint64_t mant_low:64;
  62 #endif
  63 #if __LITTLE_ENDIAN__
  64     uint64_t mant_low:64;
  65     uint64_t mant_high:48;
  66     unsigned exponent:15;
  67     unsigned negative:1;
  68 #endif
  69   } ieee;
  70
  71   struct
  72   {
  73 #if __BIG_ENDIAN__
  74     uint64_t high;
  75     uint64_t low;
  76 #endif
  77 #if __LITTLE_ENDIAN__
  78     uint64_t low;
  79     uint64_t high;
  80 #endif
  81   } words64;
  82
  83   struct
  84   {
  85 #if __BIG_ENDIAN__
  86     uint32_t w0;
  87     uint32_t w1;
  88     uint32_t w2;
  89     uint32_t w3;
  90 #endif
  91 #if __LITTLE_ENDIAN__
  92     uint32_t w3;
  93     uint32_t w2;
  94     uint32_t w1;
  95     uint32_t w0;
  96 #endif
  97   } words32;
  98
  99   struct
 100   {
 101 #if __BIG_ENDIAN__
 102     unsigned negative:1;
 103     unsigned exponent:15;
 104     unsigned quiet_nan:1;
 105     uint64_t mant_high:47;
 106     uint64_t mant_low:64;
 107 #endif
 108 #if __LITTLE_ENDIAN__
 109     uint64_t mant_low:64;
 110     uint64_t mant_high:47;
 111     unsigned quiet_nan:1;
 112     unsigned exponent:15;
 113     unsigned negative:1;
 114 #endif
 115   } nan;
 116
 117 } ieee854_float128;
 118
 119
 120 /* Get two 64 bit ints from a long double.  */
 121 #define GET_FLT128_WORDS64(ix0,ix1,d)  \
 122 do {                                   \
 123   ieee854_float128 u;                  \
 124   u.value = (d);                       \
 125   (ix0) = u.words64.high;              \
 126   (ix1) = u.words64.low;               \
 127 } while (0)
 128
 129 /* Set a long double from two 64 bit ints.  */
 130 #define SET_FLT128_WORDS64(d,ix0,ix1)  \
 131 do {                                   \
 132   ieee854_float128 u;                  \
 133   u.words64.high = (ix0);              \
 134   u.words64.low = (ix1);               \
 135   (d) = u.value;                       \
 136 } while (0)
 137
 138 /* Get the more significant 64 bits of a long double mantissa.  */
 139 #define GET_FLT128_MSW64(v,d)          \
 140 do {                                   \
 141   ieee854_float128 u;                  \
 142   u.value = (d);                       \
 143   (v) = u.words64.high;                \
 144 } while (0)
 145
 146 /* Set the more significant 64 bits of a long double mantissa from an int.  */
 147 #define SET_FLT128_MSW64(d,v)          \
 148 do {                                   \
 149   ieee854_float128 u;                  \
 150   u.value = (d);                       \
 151   u.words64.high = (v);                \
 152   (d) = u.value;                       \
 153 } while (0)
 154
 155 /* Get the least significant 64 bits of a long double mantissa.  */
 156 #define GET_FLT128_LSW64(v,d)          \
 157 do {                                   \
 158   ieee854_float128 u;                  \
 159   u.value = (d);                       \
 160   (v) = u.words64.low;                 \
 161 } while (0)
 162
 163
 164 #define IEEE854_FLOAT128_BIAS 0x3fff
 165
 166
 167 #endif