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36437f14e8
This is mainly intended to allow 64 bit compiles on any system and avoid to crash when the binary, compiled on a box where POPCNT is not supported, is run on a Core i7 system or similar CPU. What could happen is that when compiled in a standard 64 bit system, because the correct headers for the POPCNT intrinsic are not found, the compiler creates dummy bit count functions instead, these are never called at runtime on the machine where Stockfish has been compiled. But if we run the same binary on a Core i7 system, because POPCNT is detected at run time, the dummy bitcount functions will be called giving false results that will crash the application. Note that would be possible to fallback on software bit count in these cases, but this is even more subtle because POPCNT path is not optimized so that we have an application working but at sub-optimal speed, so better to crash, at least user is loudly warned that there is something wrong. If, instead, Stockfish is compiled on a Core i7 system with POPCNT enabled, then if the PGO compile has been done properly, the same binary will run at optimal speed _both_ on the Core i7 machine and on any other 64 bit standard machine. This is the ideal mode for binary distribution. Finally this patch disables bsfq support under Windows, because it seems inline assembly is not supported both by MSVC and by Intel Windows version. Signed-off-by: Marco Costalba <mcostalba@gmail.com>
70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
/*
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Stockfish, a UCI chess playing engine derived from Glaurung 2.1
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Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
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Copyright (C) 2008-2009 Marco Costalba
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Stockfish is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Stockfish is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#if !defined(TYPES_H_INCLUDED)
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#define TYPES_H_INCLUDED
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#if !defined(_MSC_VER)
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#include <inttypes.h>
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#else
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typedef __int8 int8_t;
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typedef unsigned __int8 uint8_t;
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typedef __int16 int16;
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typedef unsigned __int16 uint16_t;
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typedef __int32 int32;
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typedef unsigned __int32 uint32_t;
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typedef __int64 int64;
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typedef unsigned __int64 uint64_t;
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typedef __int16 int16_t;
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typedef __int64 int64_t;
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#endif // !defined(_MSC_VER)
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// Hash keys
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typedef uint64_t Key;
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// Bitboard type
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typedef uint64_t Bitboard;
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////
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//// Compiler specific defines
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////
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// Quiet a warning on Intel compiler
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#if !defined(__SIZEOF_INT__ )
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#define __SIZEOF_INT__ 0
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#endif
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// Check for 64 bits for different compilers: Intel, MSVC and gcc
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#if defined(__x86_64) || defined(_M_X64) || defined(_WIN64) || (__SIZEOF_INT__ > 4)
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#define IS_64BIT
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#endif
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#if defined(IS_64BIT) && !defined(_WIN64) && (defined(__GNUC__) || defined(__INTEL_COMPILER))
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#define USE_BSFQ
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#endif
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#endif // !defined(TYPES_H_INCLUDED)
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