soft-fp/soft-fp.h

   1 /* Software floating-point emulation.
   2    Copyright (C) 1997,1998,1999,2000,2002,2003,2005
   3         Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5    Contributed by Richard Henderson (rth@cygnus.com),
   6                   Jakub Jelinek (jj@ultra.linux.cz),
   7                   David S. Miller (davem@redhat.com) and
   8                   Peter Maydell (pmaydell@chiark.greenend.org.uk).
   9
  10    The GNU C Library is free software; you can redistribute it and/or
  11    modify it under the terms of the GNU Lesser General Public
  12    License as published by the Free Software Foundation; either
  13    version 2.1 of the License, or (at your option) any later version.
  14
  15    The GNU C Library is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18    Lesser General Public License for more details.
  19
  20    You should have received a copy of the GNU Lesser General Public
  21    License along with the GNU C Library; if not, write to the Free
  22    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  23    02111-1307 USA.  */
  24
  25 #ifndef SOFT_FP_H
  26 #define SOFT_FP_H
  27
  28 #include <sfp-machine.h>
  29
  30 /* Allow sfp-machine to have its own byte order definitions. */
  31 #ifndef __BYTE_ORDER
  32 #include <endian.h>
  33 #endif
  34
  35 #define _FP_WORKBITS            3
  36 #define _FP_WORK_LSB            ((_FP_W_TYPE)1 << 3)
  37 #define _FP_WORK_ROUND          ((_FP_W_TYPE)1 << 2)
  38 #define _FP_WORK_GUARD          ((_FP_W_TYPE)1 << 1)
  39 #define _FP_WORK_STICKY         ((_FP_W_TYPE)1 << 0)
  40
  41 #ifndef FP_RND_NEAREST
  42 # define FP_RND_NEAREST         0
  43 # define FP_RND_ZERO            1
  44 # define FP_RND_PINF            2
  45 # define FP_RND_MINF            3
  46 #endif
  47 #ifndef FP_ROUNDMODE
  48 # define FP_ROUNDMODE           FP_RND_NEAREST
  49 #endif
  50
  51 /* By default don't care about exceptions. */
  52 #ifndef FP_EX_INVALID
  53 #define FP_EX_INVALID           0
  54 #endif
  55 #ifndef FP_EX_OVERFLOW
  56 #define FP_EX_OVERFLOW          0
  57 #endif
  58 #ifndef FP_EX_UNDERFLOW
  59 #define FP_EX_UNDERFLOW         0
  60 #endif
  61 #ifndef FP_EX_DIVZERO
  62 #define FP_EX_DIVZERO           0
  63 #endif
  64 #ifndef FP_EX_INEXACT
  65 #define FP_EX_INEXACT           0
  66 #endif
  67 #ifndef FP_EX_DENORM
  68 #define FP_EX_DENORM            0
  69 #endif
  70
  71 #ifdef _FP_DECL_EX
  72 #define FP_DECL_EX                                      \
  73   int _fex = 0;                                         \
  74   _FP_DECL_EX
  75 #else
  76 #define FP_DECL_EX int _fex = 0
  77 #endif
  78
  79 #ifndef FP_INIT_ROUNDMODE
  80 #define FP_INIT_ROUNDMODE do {} while (0)
  81 #endif
  82
  83 #ifndef FP_HANDLE_EXCEPTIONS
  84 #define FP_HANDLE_EXCEPTIONS do {} while (0)
  85 #endif
  86
  87 #ifndef FP_INHIBIT_RESULTS
  88 /* By default we write the results always.
  89  * sfp-machine may override this and e.g.
  90  * check if some exceptions are unmasked
  91  * and inhibit it in such a case.
  92  */
  93 #define FP_INHIBIT_RESULTS 0
  94 #endif
  95
  96 #define FP_SET_EXCEPTION(ex)                            \
  97   _fex |= (ex)
  98
  99 #define FP_UNSET_EXCEPTION(ex)                          \
 100   _fex &= ~(ex)
 101
 102 #define FP_CLEAR_EXCEPTIONS                             \
 103   _fex = 0
 104
 105 #define _FP_ROUND_NEAREST(wc, X)                        \
 106 do {                                                    \
 107     if ((_FP_FRAC_LOW_##wc(X) & 15) != _FP_WORK_ROUND)  \
 108       _FP_FRAC_ADDI_##wc(X, _FP_WORK_ROUND);            \
 109 } while (0)
 110
 111 #define _FP_ROUND_ZERO(wc, X)           (void)0
 112
 113 #define _FP_ROUND_PINF(wc, X)                           \
 114 do {                                                    \
 115     if (!X##_s && (_FP_FRAC_LOW_##wc(X) & 7))           \
 116       _FP_FRAC_ADDI_##wc(X, _FP_WORK_LSB);              \
 117 } while (0)
 118
 119 #define _FP_ROUND_MINF(wc, X)                           \
 120 do {                                                    \
 121     if (X##_s && (_FP_FRAC_LOW_##wc(X) & 7))            \
 122       _FP_FRAC_ADDI_##wc(X, _FP_WORK_LSB);              \
 123 } while (0)
 124
 125 #define _FP_ROUND(wc, X)                        \
 126 do {                                            \
 127         if (_FP_FRAC_LOW_##wc(X) & 7)           \
 128           FP_SET_EXCEPTION(FP_EX_INEXACT);      \
 129         switch (FP_ROUNDMODE)                   \
 130         {                                       \
 131           case FP_RND_NEAREST:                  \
 132             _FP_ROUND_NEAREST(wc,X);            \
 133             break;                              \
 134           case FP_RND_ZERO:                     \
 135             _FP_ROUND_ZERO(wc,X);               \
 136             break;                              \
 137           case FP_RND_PINF:                     \
 138             _FP_ROUND_PINF(wc,X);               \
 139             break;                              \
 140           case FP_RND_MINF:                     \
 141             _FP_ROUND_MINF(wc,X);               \
 142             break;                              \
 143         }                                       \
 144 } while (0)
 145
 146 #define FP_CLS_NORMAL           0
 147 #define FP_CLS_ZERO             1
 148 #define FP_CLS_INF              2
 149 #define FP_CLS_NAN              3
 150
 151 #define _FP_CLS_COMBINE(x,y)    (((x) << 2) | (y))
 152
 153 #include "op-1.h"
 154 #include "op-2.h"
 155 #include "op-4.h"
 156 #include "op-8.h"
 157 #include "op-common.h"
 158
 159 /* Sigh.  Silly things longlong.h needs.  */
 160 #define UWtype          _FP_W_TYPE
 161 #define W_TYPE_SIZE     _FP_W_TYPE_SIZE
 162
 163 typedef int QItype __attribute__((mode(QI)));
 164 typedef int SItype __attribute__((mode(SI)));
 165 typedef int DItype __attribute__((mode(DI)));
 166 typedef unsigned int UQItype __attribute__((mode(QI)));
 167 typedef unsigned int USItype __attribute__((mode(SI)));
 168 typedef unsigned int UDItype __attribute__((mode(DI)));
 169 #if _FP_W_TYPE_SIZE == 32
 170 typedef unsigned int UHWtype __attribute__((mode(HI)));
 171 #elif _FP_W_TYPE_SIZE == 64
 172 typedef USItype UHWtype;
 173 #endif
 174
 175 #ifndef umul_ppmm
 176 #include <stdlib/longlong.h>
 177 #endif
 178
 179 #include <stdlib.h>
 180
 181 #endif