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/* Returns x * FLT_RADIX^y without computing the right side directly
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>
#define FUNCTION_NAME scalbn
#include <dfpmacro.h>
#include <stdio.h>
static DEC_TYPE
IEEE_FUNCTION_NAME (DEC_TYPE x, int y)
{
decContext context;
DEC_TYPE result;
decNumber dn_x, dn_y;
/* long int sum = 0L; */
/* uint32_t temp2 = 0; */
/* Otherwise this may pass a bad residue to decFinalize which can result in
* rounding error. */
/* int32_t temp =0; */
FUNC_CONVERT_TO_DN(&x, &dn_x);
if (decNumberIsNaN (&dn_x))
return x+x;
if (decNumberIsInfinite (&dn_x) || decNumberIsZero (&dn_x) || y==0L)
return x;
decContextDefault(&context, DEFAULT_CONTEXT);
// sum = dn_x.exponent + y;
// if(sum >= 1000000000L || sum <= -2000000000LL)
// ; /** definite overflow */
// else
// dn_x.exponent = sum;
//
// decFinalize(&dn_x, &context, &temp, &temp2);
decNumberFromInt32(&dn_y, y);
decNumberScaleB(&dn_x, &dn_x, &dn_y, &context);
FUNC_CONVERT_FROM_DN(&dn_x, &result, &context);
if (context.status & DEC_Overflow)
DFP_EXCEPT (FE_OVERFLOW);
return result;
}
DEC_TYPE
INTERNAL_FUNCTION_NAME (DEC_TYPE x, int y)
{
DEC_TYPE z = IEEE_FUNCTION_NAME (x, y);
if (!FUNC_D(__isfinite) (z) && FUNC_D(__isfinite) (x))
DFP_ERRNO (ERANGE);
return z;
}
weak_alias (INTERNAL_FUNCTION_NAME, EXTERNAL_FUNCTION_NAME)
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