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Retire USE_COMPACT_ROOK_ATTACKS and USE_FOLDED_BITSCAN defines

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This greatly simplifies bitboard.cpp that now has only two setups,
respectively for 32 and 64 bits CPU according to IS_64BIT define
that is automatically set but can be tweaked manually in
bitboard.h

No functional change both in 32 and in 64 bits.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2009-07-02 16:49:41 +02:00
parent b45936a8c7
commit 063e2441b1
3 changed files with 164 additions and 309 deletions
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Readme.txt
+2 -21
View File
@@ -45,7 +45,6 @@ PolyGlot documentation. The book file can be selected by setting the
UCI parameter "Book File".
4. Compiling it yourself
------------------------
@@ -54,27 +53,9 @@ Stockfish directly from the source code with the included Makefile.
The exception is computer with big-endian CPUs, like PowerPC
Macintoshes. Some of the bitboard routines in the current version of
Stockfish are endianness-sensitive, and won't work on a big-endian CPU.
Ensuring that the line with #define USE_32BIT_ATTACKS" near the top
of bitboard.h is commented out should solve this problem.
Commenting out the line with "#define USE_32BIT_ATTACKS" near the
There is also a problem with compiling Stockfish on certain 64-bit
systems, regardless of the endianness. If Stockfish segfaults
immediately after startup, try to comment out the line with
"#define USE_FOLDED_BITSCAN" near the beginning of bitboard.h and
recompile.
Finally, even if Stockfish does work without any changes on your
computer, it might be possible to improve the performance by changing
some of the #define directives in bitboard.h. The default settings
are optimized for 64-bit CPUs. On 32-bit CPUs, it is probably better
to switch on USE_32BIT_ATTACKS, and to use BITCOUNT_SWAR_32 instead of
BITCOUNT_SWAR_64. For computers with very little memory (like
handheld devices), it is possible to conserve memory by defining
USE_COMPACT_ROOK_ATTACKS.
6. Terms of use
5. Terms of use
---------------
Stockfish is free, and distributed under the GNU General Public License
@@ -93,7 +74,7 @@ For full details, read the copy of the GPL found in the file named
Copying.txt.
7. Feedback
6. Feedback
-----------
The author's e-mail address is mcostalba@gmail.com