libdecnumber/decLibrary.c

   1 /* Temporary library support for decimal floating point.
   2    Copyright (C) 2005, 2006 Free Software Foundation, Inc.
   3
   4    This file is part of GCC.
   5
   6    GCC is free software; you can redistribute it and/or modify it
   7    under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2, or (at your option)
   9    any later version.
  10
  11    GCC is distributed in the hope that it will be useful, but WITHOUT
  12    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  13    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  14    License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with GCC; see the file COPYING.  If not, write to the Free
  18    Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
  19    02110-1301, USA.  */
  20
  21 #include "config.h"
  22 #include "decContext.h"
  23 #include "decimal128.h"
  24 #include "decimal64.h"
  25 #include "decimal32.h"
  26
  27 void __host_to_ieee_32 (_Decimal32, decimal32 *);
  28 void __host_to_ieee_64 (_Decimal64, decimal64 *);
  29 void __host_to_ieee_128 (_Decimal128, decimal128 *);
  30
  31 extern int isinfd32 (_Decimal32);
  32 extern int isinfd64 (_Decimal64);
  33 extern int isinfd128 (_Decimal128);
  34 uint32_t __dec_byte_swap (uint32_t);
  35
  36 int
  37 isinfd32 (_Decimal32 arg)
  38 {
  39   decNumber dn;
  40   decimal32 d32;
  41
  42   __host_to_ieee_32 (arg, &d32);
  43   decimal32ToNumber (&d32, &dn);
  44   return (decNumberIsInfinite (&dn));
  45 }
  46
  47 int
  48 isinfd64 (_Decimal64 arg)
  49 {
  50   decNumber dn;
  51   decimal64 d64;
  52
  53   __host_to_ieee_64 (arg, &d64);
  54   decimal64ToNumber (&d64, &dn);
  55   return (decNumberIsInfinite (&dn));
  56 }
  57
  58 int
  59 isinfd128 (_Decimal128 arg)
  60 {
  61   decNumber dn;
  62   decimal128 d128;
  63
  64   __host_to_ieee_128 (arg, &d128);
  65   decimal128ToNumber (&d128, &dn);
  66   return (decNumberIsInfinite (&dn));
  67 }
  68
  69 uint32_t
  70 __dec_byte_swap (uint32_t in)
  71 {
  72   uint32_t out = 0;
  73   unsigned char *p = (unsigned char *) &out;
  74   union {
  75     uint32_t i;
  76     unsigned char b[4];
  77   } u;
  78
  79   u.i = in;
  80   p[0] = u.b[3];
  81   p[1] = u.b[2];
  82   p[2] = u.b[1];
  83   p[3] = u.b[0];
  84
  85   return out;
  86 }