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/* Conversions between _Float128 and _DecimalN types
Copyright (C) 2020 Free Software Foundation, Inc.
This file is part of the Decimal Floating Point C Library.
The Decimal Floating Point C Library is free software; you can
redistribute it and/or modify it under the terms of the GNU Lesser
General Public License version 2.1.
The Decimal Floating Point C Library is distributed in the hope that
it will be useful, but WITHOUT ANY WARRANTY; without even the implied
warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
the GNU Lesser General Public License version 2.1 for more details.
You should have received a copy of the GNU Lesser General Public
License version 2.1 along with the Decimal Floating Point C Library;
if not, write to the Free Software Foundation, Inc., 51 Franklin
Street, Fifth Floor, Boston, MA 02110-1301 USA.
Please see libdfp/COPYING.txt for more information. */
#define _GNU_SOURCE
#define __STDC_WANT_IEC_60559_TYPES_EXT__
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
/* Order matters to ensure decNumber object is sufficiently large. */
#include <decimal128.h>
#include <decimal64.h>
#include <decimal32.h>
#include <convert.h>
#define BUFMAX 128
#define DECL_TO_F128(fmode,dmode,N,func) \
_Float128 \
func ## dmode ## fmode ## 2 (_Decimal ## N a); \
_Float128 \
func ## dmode ## fmode ## 2 (_Decimal ## N a) \
{ \
char buf[BUFMAX]; \
decNumber n; \
decContext context; \
decContextDefault (&context, DEC_INIT_DECIMAL ## N); \
decimal ## N ## ToNumber ((decimal ## N *)&a, &n); \
decNumberToString (&n, buf); \
return strtof128 (buf, NULL); \
}
DECL_TO_F128 (kf, sd, 32, __dpd_extend);
DECL_TO_F128 (kf, dd, 64, __dpd_extend);
DECL_TO_F128 (td, kf, 128, __dpd_trunc);
#define DECL_FROM_F128(fmode,dmode,N,func) \
_Decimal ## N \
func ## fmode ## dmode ## 2 (_Float128 a); \
_Decimal ## N \
func ## fmode ## dmode ## 2 (_Float128 a) \
{ \
_Decimal ## N f;\
char buf[BUFMAX]; \
decContext context; \
strfromf128 (buf, BUFMAX, "%.35e", a); \
decContextDefault (&context, DEC_INIT_DECIMAL ## N); \
decimal ## N ## FromString( (decimal ## N *) &f, buf, &context); \
if (context.status != 0) { \
int dec_flags = context.status & \
(DEC_IEEE_854_Inexact|DEC_IEEE_854_Invalid_operation|DEC_IEEE_854_Overflow); \
DFP_HANDLE_EXCEPTIONS(DFP_IEEE_FLAGS(dec_flags)); \
} \
return f; \
}
DECL_FROM_F128 (kf, sd, 32, __dpd_trunc);
DECL_FROM_F128 (kf, dd, 64, __dpd_trunc);
DECL_FROM_F128 (td, kf, 128, __dpd_extend);
/* Note, each function has an alias to the GCC 9+ name of the
intrinsic. GCC < 9 named these differently. Also note the
naming of KF <-> TD functions was reversed too. */
strong_alias (__dpd_extendsdkf2, __dpd_extendsdkf);
strong_alias (__dpd_extendddkf2, __dpd_extendddkf);
strong_alias (__dpd_trunckftd2, __dpd_trunctdkf);
strong_alias (__dpd_trunckfsd2, __dpd_trunckfsd);
strong_alias (__dpd_trunckfdd2, __dpd_trunckfdd);
strong_alias (__dpd_extendtdkf2, __dpd_extendkftd);
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