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/* Floating point multiply and add (x * y + z)
Copyright (C) 2006 IBM Corporation.
Copyright (C) 2007-2015 Free Software Foundation, Inc.
This file is part of the Decimal Floating Point C Library.
Author(s): Joseph Kerian <jkerian@us.ibm.com>
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., 59 Temple Place,
Suite 330, Boston, MA 02111-1307 USA.
Please see libdfp/COPYING.txt for more information. */
#ifndef _DECIMAL_SIZE
# include <decimal32.h>
# define _DECIMAL_SIZE 32
#endif
#include <decContext.h>
#include <decNumber.h>
#include <math.h>
#include <errno.h>
#include <ieee754r_private.h>
#include <decNumberMath.h>
#define FUNCTION_NAME fma
#include <dfpmacro.h>
static DEC_TYPE
IEEE_FUNCTION_NAME (DEC_TYPE x, DEC_TYPE y, DEC_TYPE z)
{
decContext context;
decNumber dn_result;
DEC_TYPE result;
decNumber dn_x;
decNumber dn_y;
decNumber dn_product;
decNumber dn_z;
FUNC_CONVERT_TO_DN (&x, &dn_x);
FUNC_CONVERT_TO_DN (&y, &dn_y);
FUNC_CONVERT_TO_DN (&z, &dn_z);
/* If x or y is NaN, return NaN */
if (decNumberIsNaN (&dn_x) || decNumberIsNaN (&dn_y))
return x+y;
/* Domain error if x or y is Inf, the other is 0 */
if ( (decNumberIsInfinite (&dn_x) && decNumberIsZero (&dn_y)) ||
(decNumberIsInfinite (&dn_y) && decNumberIsZero (&dn_x)) )
{
DFP_EXCEPT (FE_INVALID);
return DFP_NAN;
}
/* If x and y are not 0,Inf or Inf,0, and z is NaN, return NaN */
if (decNumberIsNaN (&dn_z))
return z+z;
decContextDefault (&context, DEFAULT_CONTEXT);
decNumberMultiply (&dn_product, &dn_x, &dn_y, &context);
/* Domain error if x*y = Inf and z=Inf (with opposite signs) */
if (decNumberIsInfinite (&dn_product) && decNumberIsInfinite (&dn_z) &&
(decNumberIsNegative (&dn_product) != decNumberIsNegative (&dn_z)))
{
DFP_EXCEPT (FE_INVALID);
return DFP_NAN;
}
decNumberAdd (&dn_result, &dn_product, &dn_z, &context);
FUNC_CONVERT_FROM_DN (&dn_result, &result, &context);
return result;
}
DEC_TYPE
INTERNAL_FUNCTION_NAME (DEC_TYPE x, DEC_TYPE y, DEC_TYPE z)
{
DEC_TYPE r = IEEE_FUNCTION_NAME (x, y, z);
if ( (FUNC_D(__isinf) (x) && y == DFP_CONSTANT(0.0)) ||
(FUNC_D(__isinf) (y) && x == DFP_CONSTANT(0.0)) )
DFP_ERRNO(EDOM);
else if (FUNC_D (__isinf) (z))
{
int isneg = FUNC_D(__signbit) (x) ^ FUNC_D(__signbit) (y);
int inf = FUNC_D(__isinf) (x) | FUNC_D(__isinf) (y);
if ( inf && FUNC_D (__signbit) (z) != isneg)
DFP_ERRNO (EDOM);
}
return r;
}
weak_alias (INTERNAL_FUNCTION_NAME, EXTERNAL_FUNCTION_NAME)
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