85 lines
3.1 KiB
C
85 lines
3.1 KiB
C
/* $NetBSD: byte_swap.h,v 1.1 2001/06/19 00:20:10 fvdl Exp $ */
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/*-
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* Copyright (c) 1998 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Charles M. Hannum.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copy of the i386 version. 64 bit versions may be added later.
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*/
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#ifndef _X86_64_BYTE_SWAP_H_
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#define _X86_64_BYTE_SWAP_H_
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#define __byte_swap_long_variable(x) __extension__ \
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({ register in_addr_t __x = (x); \
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__asm ("bswap %1" \
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: "=r" (__x) \
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: "0" (__x)); \
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__x; })
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#define __byte_swap_word_variable(x) __extension__ \
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({ register in_port_t __x = (x); \
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__asm ("rorw $8, %w1" \
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: "=r" (__x) \
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: "0" (__x)); \
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__x; })
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#ifdef __OPTIMIZE__
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#define __byte_swap_long_constant(x) \
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((((x) & 0xff000000) >> 24) | \
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(((x) & 0x00ff0000) >> 8) | \
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(((x) & 0x0000ff00) << 8) | \
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(((x) & 0x000000ff) << 24))
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#define __byte_swap_word_constant(x) \
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((((x) & 0xff00) >> 8) | \
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(((x) & 0x00ff) << 8))
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#define __byte_swap_long(x) \
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(__builtin_constant_p((x)) ? \
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__byte_swap_long_constant(x) : __byte_swap_long_variable(x))
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#define __byte_swap_word(x) \
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(__builtin_constant_p((x)) ? \
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__byte_swap_word_constant(x) : __byte_swap_word_variable(x))
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#else /* __OPTIMIZE__ */
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#define __byte_swap_long(x) __byte_swap_long_variable(x)
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#define __byte_swap_word(x) __byte_swap_word_variable(x)
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#endif /* __OPTIMIZE__ */
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#endif /* !_X86_64_BYTE_SWAP_H_ */
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