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38 lines
1.5 KiB
C
38 lines
1.5 KiB
C
/* Copyright (C) 2011-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
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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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#if !defined _BYTESWAP_H && !defined _NETINET_IN_H && !defined _ENDIAN_H
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# error "Never use <bits/byteswap.h> directly; include <byteswap.h> instead."
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#endif
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#ifndef _BITS_BYTESWAP_H
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#define _BITS_BYTESWAP_H 1
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#include <bits/types.h>
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/* gcc __builtin_bswap64() can constant-fold, etc, so always use it. */
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#define __bswap_16(x) ((unsigned short)(__builtin_bswap32(x) >> 16))
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#define __bswap_32(x) ((unsigned int)__builtin_bswap32(x))
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#define __bswap_64(x) ((__uint64_t)__builtin_bswap64(x))
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#define __bswap_constant_16(x) __bswap_16(x)
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#define __bswap_constant_32(x) __bswap_32(x)
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#define __bswap_constant_64(x) __bswap_64(x)
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#endif /* _BITS_BYTESWAP_H */
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