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53 lines
1.5 KiB
C
53 lines
1.5 KiB
C
/* Software floating-point emulation.
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scalblnl(x, exp)
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Copyright (C) 1999-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Jakub Jelinek (jj@ultra.linux.cz).
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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/*
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* scalblnl (long double x, long int n)
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* scalblnl(x,n) returns x* 2**n computed by exponent
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* manipulation rather than by actually performing an
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* exponentiation or a multiplication.
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*/
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#include "soft-fp.h"
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#include "quad.h"
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long double __scalblnl(long double arg, int exp)
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{
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FP_DECL_EX;
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FP_DECL_Q(A);
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long double r;
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FP_UNPACK_Q(A, arg);
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switch (A_c)
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{
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case FP_CLS_ZERO:
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return arg;
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case FP_CLS_NAN:
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case FP_CLS_INF:
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FP_HANDLE_EXCEPTIONS;
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return arg;
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}
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A_e += exp;
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FP_PACK_Q(r, A);
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FP_HANDLE_EXCEPTIONS;
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return r;
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}
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