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    In addition to the permissions in the GNU General Public License,
  12    the Free Software Foundation gives you unlimited permission to link
  13    the compiled version of this file into combinations with other
  14    programs, and to distribute those combinations without any
  15    restriction coming from the use of this file.  (The General Public
  16    License restrictions do apply in other respects; for example, they
  17    cover modification of the file, and distribution when not linked
  18    into a combine executable.)
  19
  20    GCC is distributed in the hope that it will be useful, but WITHOUT
  21    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  22    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  23    License for more details.
  24
  25    You should have received a copy of the GNU General Public License
  26    along with GCC; see the file COPYING.  If not, write to the Free
  27    Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
  28    02110-1301, USA.  */
  29
  30 #include "config.h"
  31 #include "decContext.h"
  32 #include "decimal128.h"
  33 #include "decimal64.h"
  34 #include "decimal32.h"
  35
  36 void __host_to_ieee_32 (_Decimal32, decimal32 *);
  37 void __host_to_ieee_64 (_Decimal64, decimal64 *);
  38 void __host_to_ieee_128 (_Decimal128, decimal128 *);
  39
  40 extern int isinfd32 (_Decimal32);
  41 extern int isinfd64 (_Decimal64);
  42 extern int isinfd128 (_Decimal128);
  43 uint32_t __dec_byte_swap (uint32_t);
  44
  45 int
  46 isinfd32 (_Decimal32 arg)
  47 {
  48   decNumber dn;
  49   decimal32 d32;
  50
  51   __host_to_ieee_32 (arg, &d32);
  52   decimal32ToNumber (&d32, &dn);
  53   return (decNumberIsInfinite (&dn));
  54 }
  55
  56 int
  57 isinfd64 (_Decimal64 arg)
  58 {
  59   decNumber dn;
  60   decimal64 d64;
  61
  62   __host_to_ieee_64 (arg, &d64);
  63   decimal64ToNumber (&d64, &dn);
  64   return (decNumberIsInfinite (&dn));
  65 }
  66
  67 int
  68 isinfd128 (_Decimal128 arg)
  69 {
  70   decNumber dn;
  71   decimal128 d128;
  72
  73   __host_to_ieee_128 (arg, &d128);
  74   decimal128ToNumber (&d128, &dn);
  75   return (decNumberIsInfinite (&dn));
  76 }
  77
  78 uint32_t
  79 __dec_byte_swap (uint32_t in)
  80 {
  81   uint32_t out = 0;
  82   unsigned char *p = (unsigned char *) &out;
  83   union {
  84     uint32_t i;
  85     unsigned char b[4];
  86   } u;
  87
  88   u.i = in;
  89   p[0] = u.b[3];
  90   p[1] = u.b[2];
  91   p[2] = u.b[1];
  92   p[3] = u.b[0];
  93
  94   return out;
  95 }