mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-23 05:20:06 +00:00
53 lines
1.4 KiB
C
53 lines
1.4 KiB
C
/* 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;
|
|
}
|