StdLib/Include/Aarch64/machine/byte_swap.h

   1 /*-
   2  * Copyright (c) 1997, 1999, 2002 The NetBSD Foundation, Inc.
   3  * All rights reserved.
   4  *
   5  * This code is derived from software contributed to The NetBSD Foundation
   6  * by Charles M. Hannum, Neil A. Carson, and Jason R. Thorpe.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  18  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  19  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  20  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  21  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  22  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  23  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  25  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  26  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  27  * POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30 #ifndef _AARCH64_BYTE_SWAP_H_
  31 #define _AARCH64_BYTE_SWAP_H_
  32
  33 #ifdef __GNUC__
  34 #include <sys/types.h>
  35 __BEGIN_DECLS
  36
  37 #define __BYTE_SWAP_U32_VARIABLE __byte_swap_u32_variable
  38 static __inline uint32_t
  39 __byte_swap_u32_variable(uint32_t v)
  40 {
  41         uint32_t t1;
  42
  43         t1 = v ^ ((v << 16) | (v >> 16));
  44         t1 &= 0xff00ffffU;
  45         v = (v >> 8) | (v << 24);
  46         v ^= (t1 >> 8);
  47         return (v);
  48 }
  49
  50 #define __BYTE_SWAP_U16_VARIABLE __byte_swap_u16_variable
  51 static __inline uint16_t
  52 __byte_swap_u16_variable(uint16_t v)
  53 {
  54
  55         v &= 0xffff;
  56         v = (v >> 8) | (v << 8);
  57         return (v);
  58 }
  59
  60 __END_DECLS
  61 #endif
  62
  63 #endif /* _AARCH64_BYTE_SWAP_H_ */