2 This file is a part of libcds - Concurrent Data Structures library
4 (C) Copyright Maxim Khizhinsky (libcds.dev@gmail.com) 2006-2017
6 Source code repo: http://github.com/khizmax/libcds/
7 Download: http://sourceforge.net/projects/libcds/files/
9 Redistribution and use in source and binary forms, with or without
10 modification, are permitted provided that the following conditions are met:
12 * Redistributions of source code must retain the above copyright notice, this
13 list of conditions and the following disclaimer.
15 * Redistributions in binary form must reproduce the above copyright notice,
16 this list of conditions and the following disclaimer in the documentation
17 and/or other materials provided with the distribution.
19 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
20 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
22 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
23 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
25 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
26 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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28 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 #ifndef CDSLIB_COMPILER_VC_X86_BITOP_H
32 #define CDSLIB_COMPILER_VC_X86_BITOP_H
35 #pragma intrinsic(_BitScanReverse)
36 #pragma intrinsic(_BitScanForward)
40 namespace bitop { namespace platform { namespace vc { namespace x86 {
41 // MSB - return index (1..32) of most significant bit in nArg. If nArg == 0 return 0
42 # define cds_bitop_msb32_DEFINED
43 static inline int msb32( uint32_t nArg )
46 if ( _BitScanReverse( &nIndex, nArg ))
47 return (int) nIndex + 1;
51 # define cds_bitop_msb32nz_DEFINED
52 static inline int msb32nz( uint32_t nArg )
56 _BitScanReverse( &nIndex, nArg );
60 // LSB - return index (1..32) of least significant bit in nArg. If nArg == 0 return -1U
61 # define cds_bitop_lsb32_DEFINED
62 static inline int lsb32( uint32_t nArg )
65 if ( _BitScanForward( &nIndex, nArg ))
66 return (int) nIndex + 1;
70 # define cds_bitop_lsb32nz_DEFINED
71 static inline int lsb32nz( uint32_t nArg )
75 _BitScanForward( &nIndex, nArg );
79 // bswap - Reverses the byte order of a 32-bit word
80 # define cds_bitop_bswap32_DEFINED
81 static inline uint32_t bswap32( uint32_t nArg )
89 # define cds_bitop_complement32_DEFINED
90 static inline bool complement32( uint32_t * pArg, unsigned int nBit )
92 return _bittestandcomplement( reinterpret_cast<long *>( pArg ), nBit ) != 0;
95 # define cds_bitop_complement64_DEFINED
96 static inline bool complement64( uint64_t * pArg, unsigned int nBit )
99 return _bittestandcomplement( reinterpret_cast<long *>( pArg ), nBit ) != 0;
101 return _bittestandcomplement( reinterpret_cast<long *>( pArg ) + 1, nBit - 32 ) != 0;
104 }} // namespace vc::x86
106 using namespace vc::x86;
108 }}} // namespace cds::bitop::platform
111 #endif // #ifndef CDSLIB_COMPILER_VC_X86_BITOP_H