/usr/include/root/Byteswap.h is in libroot-core-dev 5.34.00-2.
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 | /* @(#)root/base:$Id: Byteswap.h 29820 2009-08-19 14:12:40Z rdm $ */
/*************************************************************************
* 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. */
/* 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 __GNUC__ && __GNUC__ >= 2
# 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 __GNUC__ && __GNUC__ >= 2
/* 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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