106 lines
2.8 KiB
C
106 lines
2.8 KiB
C
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/* This is a software decimal floating point library.
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Copyright (C) 2007 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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In addition to the permissions in the GNU General Public License, the
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Free Software Foundation gives you unlimited permission to link the
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compiled version of this file into combinations with other programs,
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and to distribute those combinations without any restriction coming
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from the use of this file. (The General Public License restrictions
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do apply in other respects; for example, they cover modification of
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the file, and distribution when not linked into a combine
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executable.)
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to the Free
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Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301, USA. */
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/* This implements IEEE 754R decimal floating point arithmetic, but
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does not provide a mechanism for setting the rounding mode, or for
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generating or handling exceptions. Conversions between decimal
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floating point types and other types depend on C library functions.
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Contributed by Ben Elliston <bje@au.ibm.com>. */
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/* The intended way to use this file is to make two copies, add `#define '
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to one copy, then compile both copies and add them to libgcc.a. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <limits.h>
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#include "config.h"
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#include "gstdint.h"
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#include "bid-dpd.h"
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#include "decimal32.h"
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uint32_t __dec_byte_swap (uint32_t);
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void __host_to_ieee_32 (_Decimal32 in, decimal32 *out);
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void __ieee_to_host_32 (decimal32 in, _Decimal32 *out);
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#ifndef WORDS_BIGENDIAN
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#define WORDS_BIGENDIAN 0
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#endif
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uint32_t
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__dec_byte_swap (uint32_t in)
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{
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uint32_t out = 0;
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unsigned char *p = (unsigned char *) &out;
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union {
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uint32_t i;
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unsigned char b[4];
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} u;
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u.i = in;
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p[0] = u.b[3];
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p[1] = u.b[2];
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p[2] = u.b[1];
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p[3] = u.b[0];
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return out;
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}
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void
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__host_to_ieee_32 (_Decimal32 in, decimal32 *out)
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{
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uint32_t t;
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if (!WORDS_BIGENDIAN)
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{
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memcpy (&t, &in, 4);
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t = __dec_byte_swap (t);
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memcpy (out, &t, 4);
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}
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else
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memcpy (out, &in, 4);
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}
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void
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__ieee_to_host_32 (decimal32 in, _Decimal32 *out)
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{
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uint32_t t;
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if (!WORDS_BIGENDIAN)
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{
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memcpy (&t, &in, 4);
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t = __dec_byte_swap (t);
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memcpy (out, &t, 4);
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}
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else
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memcpy (out, &in, 4);
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}
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