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/* Software floating-point emulation.
scalbnl(x, exp)
Copyright (C) 1999-2017 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Jakub Jelinek (jj@ultra.linux.cz).
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU 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 for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
/*
* scalbnl (long double x, int n)
* scalbnl(x,n) returns x* 2**n computed by exponent
* manipulation rather than by actually performing an
* exponentiation or a multiplication.
*/
#include "soft-fp.h"
#include "quad.h"
long double __scalbnl(long double arg, int exp)
{
FP_DECL_EX;
FP_DECL_Q(A);
long double r;
FP_UNPACK_Q(A, arg);
switch (A_c)
{
case FP_CLS_ZERO:
return arg;
case FP_CLS_NAN:
case FP_CLS_INF:
FP_HANDLE_EXCEPTIONS;
return arg;
}
A_e += exp;
FP_PACK_Q(r, A);
FP_HANDLE_EXCEPTIONS;
return r;
}
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