/usr/include/root/Byteswap.h is in libroot-core-dev 5.34.14-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 | /* @(#)root/base:$Id$ */
/*************************************************************************
* Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *
* All rights reserved. *
* *
* For the licensing terms see $ROOTSYS/LICENSE. *
* For the list of contributors see $ROOTSYS/README/CREDITS. *
*************************************************************************/
#ifndef ROOT_Byteswap
#define ROOT_Byteswap
/* Copyright (C) 1997 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#if (defined(__linux) || defined(__APPLE__)) && \
(defined(__i386__) || defined(__x86_64__)) && \
(defined(__GNUC__) && __GNUC__ >= 2)
#ifndef R__USEASMSWAP
#define R__USEASMSWAP
#endif
#endif
/* Get the machine specific, optimized definitions. */
/* The following is copied from <bits/byteswap.h> (only from RH6.0 and above) */
/* Swap bytes in 16 bit value. */
#define R__bswap_constant_16(x) \
((((x) >> 8) & 0xff) | (((x) & 0xff) << 8))
#if defined R__USEASMSWAP
# define R__bswap_16(x) \
(__extension__ \
({ register unsigned short int __v; \
if (__builtin_constant_p (x)) \
__v = R__bswap_constant_16 (x); \
else \
__asm__ __volatile__ ("rorw $8, %w0" \
: "=r" (__v) \
: "0" ((unsigned short int) (x)) \
: "cc"); \
__v; }))
#else
/* This is better than nothing. */
# define R__bswap_16(x) R__bswap_constant_16 (x)
#endif
/* Swap bytes in 32 bit value. */
#define R__bswap_constant_32(x) \
((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) | \
(((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24))
#if defined R__USEASMSWAP
/* To swap the bytes in a word the i486 processors and up provide the
`bswap' opcode. On i386 we have to use three instructions. */
# if !defined __i486__ && !defined __pentium__ && !defined __pentiumpro__ && \
!defined __pentium4__ && !defined __x86_64__
# define R__bswap_32(x) \
(__extension__ \
({ register unsigned int __v; \
if (__builtin_constant_p (x)) \
__v = R__bswap_constant_32 (x); \
else \
__asm__ __volatile__ ("rorw $8, %w0;" \
"rorl $16, %0;" \
"rorw $8, %w0" \
: "=r" (__v) \
: "0" ((unsigned int) (x)) \
: "cc"); \
__v; }))
# else
# define R__bswap_32(x) \
(__extension__ \
({ register unsigned int __v; \
if (__builtin_constant_p (x)) \
__v = R__bswap_constant_32 (x); \
else \
__asm__ __volatile__ ("bswap %0" \
: "=r" (__v) \
: "0" ((unsigned int) (x))); \
__v; }))
# endif
#else
# define R__bswap_32(x) R__bswap_constant_32 (x)
#endif
#if defined __GNUC__ && __GNUC__ >= 2
/* Swap bytes in 64 bit value. */
# define R__bswap_64(x) \
(__extension__ \
({ union { __extension__ unsigned long long int __ll; \
UInt_t __l[2]; } __w, __r; \
__w.__ll = (x); \
__r.__l[0] = R__bswap_32 (__w.__l[1]); \
__r.__l[1] = R__bswap_32 (__w.__l[0]); \
__r.__ll; }))
#endif /* bits/byteswap.h */
/* The following definitions must all be macros since otherwise some
of the possible optimizations are not possible. */
/* Return a value with all bytes in the 16 bit argument swapped. */
#define Rbswap_16(x) R__bswap_16 (x)
/* Return a value with all bytes in the 32 bit argument swapped. */
#define Rbswap_32(x) R__bswap_32 (x)
#if defined __GNUC__ && __GNUC__ >= 2
/* Return a value with all bytes in the 64 bit argument swapped. */
# define Rbswap_64(x) R__bswap_64 (x)
#endif
#endif /* Byteswap.h */
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