73 lines
1.8 KiB
C
73 lines
1.8 KiB
C
/* Copy sign into another 'long double' number.
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Copyright (C) 2011-2024 Free Software Foundation, Inc.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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This file 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
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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#include <config.h>
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/* Specification. */
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#include <math.h>
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#if HAVE_SAME_LONG_DOUBLE_AS_DOUBLE
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long double
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copysignl (long double x, long double y)
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{
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return copysign (x, y);
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}
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#else
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# if defined __hpux && !defined __GNUC__
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# include <float.h>
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/* HP cc on HP-UX 10.20 has a bug with the constant expression -0.0L. */
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static long double
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compute_minus_zerol (void)
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{
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return -LDBL_MIN * LDBL_MIN;
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}
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# define minus_zerol compute_minus_zerol ()
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/* HP cc on HP-UX 11 has a bug: When x is a positive zero, - x comes out
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as a positive zero, rather than as a minus zero. Work around it. */
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static long double
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unary_minus (long double x)
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{
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if (x == 0.0L)
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{
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if (signbit (x))
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return 0.0L;
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else
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return minus_zerol;
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}
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else
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return - x;
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}
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# endif
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long double
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copysignl (long double x, long double y)
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{
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# if defined __hpux && !defined __GNUC__
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return (signbit (x) != signbit (y) ? unary_minus (x) : x);
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# else
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return (signbit (x) != signbit (y) ? - x : x);
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# endif
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}
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#endif
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