gcc/d/d-longdouble.cc

   1 /* d-longdouble.cc -- Software floating-point emulation for the frontend.
   2    Copyright (C) 2006-2018 Free Software Foundation, Inc.
   3
   4 GCC is free software; you can redistribute it and/or modify
   5 it under the terms of the GNU General Public License as published by
   6 the Free Software Foundation; either version 3, or (at your option)
   7 any later version.
   8
   9 GCC is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU General Public License for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with GCC; see the file COPYING3.  If not see
  16 <http://www.gnu.org/licenses/>.  */
  17
  18 #include "config.h"
  19 #include "system.h"
  20 #include "coretypes.h"
  21
  22 #include "dmd/mtype.h"
  23
  24 #include "tree.h"
  25 #include "fold-const.h"
  26 #include "diagnostic.h"
  27 #include "stor-layout.h"
  28
  29 #include "d-tree.h"
  30 #include "longdouble.h"
  31
  32
  33 /* Constant real values 0, 1, -1 and 0.5.  */
  34 real_t CTFloat::zero;
  35 real_t CTFloat::one;
  36 real_t CTFloat::minusone;
  37 real_t CTFloat::half;
  38
  39 /* Truncate longdouble to the highest precision supported by target.  */
  40
  41 longdouble
  42 longdouble::normalize (void)
  43 {
  44   const machine_mode mode = TYPE_MODE (long_double_type_node);
  45   real_convert (&this->rv (), mode, &this->rv ());
  46   return *this;
  47 }
  48
  49 /* Assign a real_value to a longdouble type.  */
  50
  51 void
  52 longdouble::set (real_value& d)
  53 {
  54   real_convert (&this->rv (), TYPE_MODE (long_double_type_node), &d);
  55 }
  56
  57 /* Conversion routines between longdouble and integer types.  */
  58
  59 void
  60 longdouble::set (int32_t d)
  61 {
  62   real_from_integer (&this->rv (), TYPE_MODE (double_type_node), d, SIGNED);
  63 }
  64
  65 void
  66 longdouble::set (int64_t d)
  67 {
  68   real_from_integer (&this->rv (), TYPE_MODE (long_double_type_node), d,
  69                      SIGNED);
  70 }
  71
  72 int64_t
  73 longdouble::to_int (void) const
  74 {
  75   bool overflow;
  76   wide_int wi = real_to_integer (&this->rv (), &overflow, 64);
  77   return wi.to_shwi ();
  78 }
  79
  80 /* Unsigned variants of the same conversion routines.  */
  81
  82 void
  83 longdouble::set (uint32_t d)
  84 {
  85   real_from_integer (&this->rv (), TYPE_MODE (double_type_node), d, UNSIGNED);
  86 }
  87
  88 void
  89 longdouble::set (uint64_t d)
  90 {
  91   real_from_integer (&this->rv (), TYPE_MODE (long_double_type_node), d,
  92                      UNSIGNED);
  93 }
  94
  95 uint64_t
  96 longdouble::to_uint (void) const
  97 {
  98   bool overflow;
  99   wide_int wi = real_to_integer (&this->rv (), &overflow, 64);
 100   return wi.to_uhwi ();
 101 }
 102
 103 /* For conversion between boolean, only need to check if is zero.  */
 104
 105 void
 106 longdouble::set (bool d)
 107 {
 108   this->rv () = (d == false) ? dconst0 : dconst1;
 109 }
 110
 111 bool
 112 longdouble::to_bool (void) const
 113 {
 114   return this->rv ().cl != rvc_zero;
 115 }
 116
 117 /* Overload numeric operators for longdouble types.  */
 118
 119 longdouble
 120 longdouble::add (const longdouble& r) const
 121 {
 122   longdouble x;
 123   real_arithmetic (&x.rv (), PLUS_EXPR, &this->rv (), &r.rv ());
 124   return x.normalize ();
 125 }
 126
 127 longdouble
 128 longdouble::sub (const longdouble& r) const
 129 {
 130   longdouble x;
 131   real_arithmetic (&x.rv (), MINUS_EXPR, &this->rv (), &r.rv ());
 132   return x.normalize ();
 133 }
 134
 135 longdouble
 136 longdouble::mul (const longdouble& r) const
 137 {
 138   longdouble x;
 139   real_arithmetic (&x.rv (), MULT_EXPR, &this->rv (), &r.rv ());
 140   return x.normalize ();
 141 }
 142
 143 longdouble
 144 longdouble::div (const longdouble& r) const
 145 {
 146   longdouble x;
 147   real_arithmetic (&x.rv (), RDIV_EXPR, &this->rv (), &r.rv ());
 148   return x.normalize ();
 149 }
 150
 151 longdouble
 152 longdouble::mod (const longdouble& r) const
 153 {
 154   longdouble x;
 155   real_value q;
 156
 157   if (r.rv ().cl == rvc_zero || REAL_VALUE_ISINF (this->rv ()))
 158     {
 159       real_nan (&x.rv (), "", 1, TYPE_MODE (long_double_type_node));
 160       return x;
 161     }
 162
 163   if (this->rv ().cl == rvc_zero)
 164     return *this;
 165
 166   if (REAL_VALUE_ISINF (r.rv ()))
 167     return *this;
 168
 169   /* Need to check for NaN?  */
 170   real_arithmetic (&q, RDIV_EXPR, &this->rv (), &r.rv ());
 171   real_arithmetic (&q, FIX_TRUNC_EXPR, &q, NULL);
 172   real_arithmetic (&q, MULT_EXPR, &q, &r.rv ());
 173   real_arithmetic (&x.rv (), MINUS_EXPR, &this->rv (), &q);
 174
 175   return x.normalize ();
 176 }
 177
 178 longdouble
 179 longdouble::neg (void) const
 180 {
 181   longdouble x;
 182   real_arithmetic (&x.rv (), NEGATE_EXPR, &this->rv (), NULL);
 183   return x.normalize ();
 184 }
 185
 186 /* Overload equality operators for longdouble types.  */
 187
 188 int
 189 longdouble::cmp (const longdouble& r) const
 190 {
 191   if (real_compare (LT_EXPR, &this->rv (), &r.rv ()))
 192     return -1;
 193
 194   if (real_compare (GT_EXPR, &this->rv (), &r.rv ()))
 195     return 1;
 196
 197   return 0;
 198 }
 199
 200 int
 201 longdouble::equals (const longdouble& r) const
 202 {
 203   return real_compare (EQ_EXPR, &this->rv (), &r.rv ());
 204 }