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Restore correct 64 bit version of pop_1st_bit()

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Was erroneusly changed with the 32bit in recent
patch "Retire USE_COMPACT_ROOK_ATTACKS...".

Also another clean up of define magics. Move compiler
specific definitions in types.h and remove redundant cruft.

Now this macro ugly mess seems more reasonable.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2009-07-03 08:40:41 +01:00
parent a87ea9846d
commit 5d79af9e0d
4 changed files with 65 additions and 91 deletions
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40
src/bitboard.h
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@@ -22,25 +22,6 @@
#if !defined(BITBOARD_H_INCLUDED)
#define BITBOARD_H_INCLUDED
////
//// Defines
////
// Quiet a warning on Intel compiler
#if !defined(__SIZEOF_INT__ )
#define __SIZEOF_INT__ 0
#endif
// Check for 64 bits for different compilers: Intel, MSVC and gcc
#if defined(__x86_64) || defined(_WIN64) || (__SIZEOF_INT__ > 4)
#define IS_64BIT
#endif
#if defined(IS_64BIT) && (defined(__GNUC__) || defined(__INTEL_COMPILER))
#define USE_BSFQ
#endif
////
//// Includes
////
@@ -51,13 +32,6 @@
#include "types.h"
////
//// Types
////
typedef uint64_t Bitboard;
////
//// Constants and variables
////
@@ -132,13 +106,6 @@ const Bitboard InFrontBB[2][8] = {
}
};
const int BitTable[64] = {
63, 30, 3, 32, 25, 41, 22, 33, 15, 50, 42, 13, 11, 53, 19, 34, 61, 29, 2,
51, 21, 43, 45, 10, 18, 47, 1, 54, 9, 57, 0, 35, 62, 31, 40, 4, 49, 5, 52,
26, 60, 6, 23, 44, 46, 27, 56, 16, 7, 39, 48, 24, 59, 14, 12, 55, 38, 28,
58, 20, 37, 17, 36, 8
};
extern Bitboard SetMaskBB[65];
extern Bitboard ClearMaskBB[65];
@@ -407,12 +374,7 @@ inline Square __attribute__((always_inline)) pop_1st_bit(Bitboard* b) {
#else // if !defined(USE_BSFQ)
inline Square first_1(Bitboard b) {
b ^= (b - 1);
uint32_t fold = int(b) ^ int(b >> 32);
return Square(BitTable[(fold * 0x783a9b23) >> 26]);
}
extern Square first_1(Bitboard b);
extern Square pop_1st_bit(Bitboard* b);
#endif