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49 lines
1.5 KiB
C
49 lines
1.5 KiB
C
/* Software floating-point emulation.
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Return !a
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Copyright (C) 1997-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Richard Henderson (rth@cygnus.com) and
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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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#include "soft-fp.h"
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#include "quad.h"
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long double _Q_neg(const long double a)
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{
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union {
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long double ldbl;
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UWtype words[4];
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} c;
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c.ldbl = a;
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#if (__BYTE_ORDER == __BIG_ENDIAN)
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c.words[0] ^= (((UWtype)1) << (W_TYPE_SIZE - 1));
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#elif (__BYTE_ORDER == __LITTLE_ENDIAN) && (W_TYPE_SIZE == 64)
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c.words[1] ^= (((UWtype)1) << (W_TYPE_SIZE - 1));
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#elif (__BYTE_ORDER == __LITTLE_ENDIAN) && (W_TYPE_SIZE == 32)
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c.words[3] ^= (((UWtype)1) << (W_TYPE_SIZE - 1));
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#else
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FP_DECL_Q(A); FP_DECL_Q(C);
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FP_UNPACK_RAW_Q(A, a);
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FP_NEG_Q(C, A);
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FP_PACK_RAW_Q(c.ldbl, C);
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#endif
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return c.ldbl;
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}
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