libquadmath/quadmath-imp.h

   1 /* GCC Quad-Precision Math Library
   2    Copyright (C) 2010, 2011 Free Software Foundation, Inc.
   3    Written by Francois-Xavier Coudert  <fxcoudert@gcc.gnu.org>
   4
   5 This file is part of the libquadmath library.
   6 Libquadmath 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 Libquadmath 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 libquadmath; 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 #include "config.h"
  28
  29
  30 /* Prototypes for internal functions.  */
  31 extern int32_t __quadmath_rem_pio2q (__float128, __float128 *);
  32 extern void __quadmath_kernel_sincosq (__float128, __float128, __float128 *,
  33                                        __float128 *, int);
  34 extern __float128 __quadmath_kernel_sinq (__float128, __float128, int);
  35 extern __float128 __quadmath_kernel_cosq (__float128, __float128);
  36
  37
  38
  39 /* Frankly, if you have __float128, you have 64-bit integers, right?  */
  40 #ifndef UINT64_C
  41 # error "No way!"
  42 #endif
  43
  44
  45 /* Main union type we use to manipulate the floating-point type.  */
  46 typedef union
  47 {
  48   __float128 value;
  49
  50   struct
  51   {
  52 #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
  53     unsigned negative:1;
  54     unsigned exponent:15;
  55     uint64_t mant_high:48;
  56     uint64_t mant_low:64;
  57 #else
  58     uint64_t mant_low:64;
  59     uint64_t mant_high:48;
  60     unsigned exponent:15;
  61     unsigned negative:1;
  62 #endif
  63   } ieee;
  64
  65   struct
  66   {
  67 #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
  68     uint64_t high;
  69     uint64_t low;
  70 #else
  71     uint64_t low;
  72     uint64_t high;
  73 #endif
  74   } words64;
  75
  76   struct
  77   {
  78 #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
  79     uint32_t w0;
  80     uint32_t w1;
  81     uint32_t w2;
  82     uint32_t w3;
  83 #else
  84     uint32_t w3;
  85     uint32_t w2;
  86     uint32_t w1;
  87     uint32_t w0;
  88 #endif
  89   } words32;
  90
  91   struct
  92   {
  93 #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
  94     unsigned negative:1;
  95     unsigned exponent:15;
  96     unsigned quiet_nan:1;
  97     uint64_t mant_high:47;
  98     uint64_t mant_low:64;
  99 #else
 100     uint64_t mant_low:64;
 101     uint64_t mant_high:47;
 102     unsigned quiet_nan:1;
 103     unsigned exponent:15;
 104     unsigned negative:1;
 105 #endif
 106   } nan;
 107
 108 } ieee854_float128;
 109
 110
 111 /* Get two 64 bit ints from a long double.  */
 112 #define GET_FLT128_WORDS64(ix0,ix1,d)  \
 113 do {                                   \
 114   ieee854_float128 u;                  \
 115   u.value = (d);                       \
 116   (ix0) = u.words64.high;              \
 117   (ix1) = u.words64.low;               \
 118 } while (0)
 119
 120 /* Set a long double from two 64 bit ints.  */
 121 #define SET_FLT128_WORDS64(d,ix0,ix1)  \
 122 do {                                   \
 123   ieee854_float128 u;                  \
 124   u.words64.high = (ix0);              \
 125   u.words64.low = (ix1);               \
 126   (d) = u.value;                       \
 127 } while (0)
 128
 129 /* Get the more significant 64 bits of a long double mantissa.  */
 130 #define GET_FLT128_MSW64(v,d)          \
 131 do {                                   \
 132   ieee854_float128 u;                  \
 133   u.value = (d);                       \
 134   (v) = u.words64.high;                \
 135 } while (0)
 136
 137 /* Set the more significant 64 bits of a long double mantissa from an int.  */
 138 #define SET_FLT128_MSW64(d,v)          \
 139 do {                                   \
 140   ieee854_float128 u;                  \
 141   u.value = (d);                       \
 142   u.words64.high = (v);                \
 143   (d) = u.value;                       \
 144 } while (0)
 145
 146 /* Get the least significant 64 bits of a long double mantissa.  */
 147 #define GET_FLT128_LSW64(v,d)          \
 148 do {                                   \
 149   ieee854_float128 u;                  \
 150   u.value = (d);                       \
 151   (v) = u.words64.low;                 \
 152 } while (0)
 153
 154
 155 #define IEEE854_FLOAT128_BIAS 0x3fff
 156
 157 #define QUADFP_NAN              0
 158 #define QUADFP_INFINITE         1
 159 #define QUADFP_ZERO             2
 160 #define QUADFP_SUBNORMAL        3
 161 #define QUADFP_NORMAL           4
 162 #define fpclassifyq(x) \
 163   __builtin_fpclassify (QUADFP_NAN, QUADFP_INFINITE, QUADFP_NORMAL, \
 164                         QUADFP_SUBNORMAL, QUADFP_ZERO, x)
 165
 166 #endif