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Introduce bitcount.h
It will be used for POPCNT intrinsics. For now no bianry and functional change. Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
parent
1b0888708d
commit
3376c68f4b
8 changed files with 192 additions and 90 deletions
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@ -35,6 +35,7 @@
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#include <iostream>
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#include "bitboard.h"
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#include "bitcount.h"
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#include "direction.h"
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@ -460,7 +461,7 @@ namespace {
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Bitboard index_to_bitboard(int index, Bitboard mask) {
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int i, j, bits = count_1s(mask);
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int i, j, bits = count_1s<false>(mask);
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Bitboard result = 0ULL;
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for(i = 0; i < bits; i++) {
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j = pop_1st_bit(&mask);
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@ -22,7 +22,6 @@
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#if !defined(BITBOARD_H_INCLUDED)
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#define BITBOARD_H_INCLUDED
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////
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//// Defines
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////
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@ -47,15 +46,10 @@
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//#define USE_32BIT_ATTACKS
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#define USE_FOLDED_BITSCAN
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#define BITCOUNT_SWAR_64
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//#define BITCOUNT_SWAR_32
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//#define BITCOUNT_LOOP
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#else
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#define USE_32BIT_ATTACKS
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#define USE_FOLDED_BITSCAN
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#define BITCOUNT_SWAR_32
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#endif
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@ -429,65 +423,6 @@ inline Bitboard isolated_pawn_mask(Square s) {
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}
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/// count_1s() counts the number of nonzero bits in a bitboard.
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#if defined(BITCOUNT_LOOP)
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inline int count_1s(Bitboard b) {
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int r;
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for(r = 0; b; r++, b &= b - 1);
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return r;
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}
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inline int count_1s_max_15(Bitboard b) {
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return count_1s(b);
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}
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#elif defined(BITCOUNT_SWAR_32)
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inline int count_1s(Bitboard b) {
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unsigned w = unsigned(b >> 32), v = unsigned(b);
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v -= (v >> 1) & 0x55555555; // 0-2 in 2 bits
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w -= (w >> 1) & 0x55555555;
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v = ((v >> 2) & 0x33333333) + (v & 0x33333333); // 0-4 in 4 bits
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w = ((w >> 2) & 0x33333333) + (w & 0x33333333);
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v = ((v >> 4) + v) & 0x0F0F0F0F; // 0-8 in 8 bits
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v += (((w >> 4) + w) & 0x0F0F0F0F); // 0-16 in 8 bits
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v *= 0x01010101; // mul is fast on amd procs
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return int(v >> 24);
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}
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inline int count_1s_max_15(Bitboard b) {
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unsigned w = unsigned(b >> 32), v = unsigned(b);
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v -= (v >> 1) & 0x55555555; // 0-2 in 2 bits
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w -= (w >> 1) & 0x55555555;
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v = ((v >> 2) & 0x33333333) + (v & 0x33333333); // 0-4 in 4 bits
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w = ((w >> 2) & 0x33333333) + (w & 0x33333333);
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v += w; // 0-8 in 4 bits
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v *= 0x11111111;
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return int(v >> 28);
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}
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#elif defined(BITCOUNT_SWAR_64)
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inline int count_1s(Bitboard b) {
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b -= ((b>>1) & 0x5555555555555555ULL);
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b = ((b>>2) & 0x3333333333333333ULL) + (b & 0x3333333333333333ULL);
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b = ((b>>4) + b) & 0x0F0F0F0F0F0F0F0FULL;
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b *= 0x0101010101010101ULL;
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return int(b >> 56);
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}
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inline int count_1s_max_15(Bitboard b) {
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b -= (b>>1) & 0x5555555555555555ULL;
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b = ((b>>2) & 0x3333333333333333ULL) + (b & 0x3333333333333333ULL);
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b *= 0x1111111111111111ULL;
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return int(b >> 60);
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}
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#endif // BITCOUNT
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////
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//// Prototypes
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////
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162
src/bitcount.h
Normal file
162
src/bitcount.h
Normal file
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@ -0,0 +1,162 @@
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/*
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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(BITCOUNT_H_INCLUDED)
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#define BITCOUNT_H_INCLUDED
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#include "bitboard.h"
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// Select type of software bit count function to use
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#if !defined(AUTO_CONFIGURATION) || defined(IS_64BIT)
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//#define USE_COMPACT_ROOK_ATTACKS
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//#define USE_32BIT_ATTACKS
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#define USE_FOLDED_BITSCAN
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#define BITCOUNT_SWAR_64
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//#define BITCOUNT_SWAR_32
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//#define BITCOUNT_LOOP
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#else
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#define USE_32BIT_ATTACKS
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#define USE_FOLDED_BITSCAN
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#define BITCOUNT_SWAR_32
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#endif
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// Select type of intrinsic bit count instruction to use
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#if defined(_MSC_VER) // Microsoft compiler
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#include <intrin.h>
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inline bool cpu_has_popcnt() {
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int CPUInfo[4] = {-1};
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__cpuid(CPUInfo, 0x00000001);
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return (CPUInfo[2] >> 23) & 1;
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}
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#define POPCNT_INTRINSIC(x) __popcnt64(x)
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#elif defined(__INTEL_COMPILER) && (defined(__x86_64) || defined(_M_X64)) // Intel compiler
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#include <nmmintrin.h>
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inline bool cpu_has_popcnt() {
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int CPUInfo[4] = {-1};
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__cpuid(CPUInfo, 0x00000001);
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return (CPUInfo[2] >> 23) & 1;
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}
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#define POPCNT_INTRINSIC(x) _mm_popcnt_u64(x)
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#else // Safe fallback for unsupported compilers
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inline bool cpu_has_popcnt() { return false; }
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#define POPCNT_INTRINSIC(x) sw_count_1s(x)
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#endif
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/// Software implementation of bit count functions
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#if defined(BITCOUNT_LOOP)
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inline int sw_count_1s(Bitboard b) {
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int r;
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for(r = 0; b; r++, b &= b - 1);
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return r;
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}
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inline int sw_count_1s_max_15(Bitboard b) {
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return count_1s(b);
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}
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#elif defined(BITCOUNT_SWAR_32)
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inline int sw_count_1s(Bitboard b) {
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unsigned w = unsigned(b >> 32), v = unsigned(b);
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v -= (v >> 1) & 0x55555555; // 0-2 in 2 bits
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w -= (w >> 1) & 0x55555555;
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v = ((v >> 2) & 0x33333333) + (v & 0x33333333); // 0-4 in 4 bits
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w = ((w >> 2) & 0x33333333) + (w & 0x33333333);
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v = ((v >> 4) + v) & 0x0F0F0F0F; // 0-8 in 8 bits
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v += (((w >> 4) + w) & 0x0F0F0F0F); // 0-16 in 8 bits
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v *= 0x01010101; // mul is fast on amd procs
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return int(v >> 24);
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}
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inline int sw_count_1s_max_15(Bitboard b) {
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unsigned w = unsigned(b >> 32), v = unsigned(b);
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v -= (v >> 1) & 0x55555555; // 0-2 in 2 bits
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w -= (w >> 1) & 0x55555555;
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v = ((v >> 2) & 0x33333333) + (v & 0x33333333); // 0-4 in 4 bits
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w = ((w >> 2) & 0x33333333) + (w & 0x33333333);
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v += w; // 0-8 in 4 bits
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v *= 0x11111111;
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return int(v >> 28);
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}
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#elif defined(BITCOUNT_SWAR_64)
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inline int sw_count_1s(Bitboard b) {
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b -= ((b>>1) & 0x5555555555555555ULL);
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b = ((b>>2) & 0x3333333333333333ULL) + (b & 0x3333333333333333ULL);
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b = ((b>>4) + b) & 0x0F0F0F0F0F0F0F0FULL;
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b *= 0x0101010101010101ULL;
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return int(b >> 56);
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}
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inline int sw_count_1s_max_15(Bitboard b) {
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b -= (b>>1) & 0x5555555555555555ULL;
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b = ((b>>2) & 0x3333333333333333ULL) + (b & 0x3333333333333333ULL);
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b *= 0x1111111111111111ULL;
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return int(b >> 60);
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}
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#endif // BITCOUNT
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/// count_1s() counts the number of nonzero bits in a bitboard.
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/// If template parameter is true an intrinsic is called, otherwise
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/// we fallback on a software implementation.
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template<bool UseIntrinsic>
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inline int count_1s(Bitboard b) {
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return UseIntrinsic ? POPCNT_INTRINSIC(b) : sw_count_1s(b);
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}
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template<bool UseIntrinsic>
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inline int count_1s_max_15(Bitboard b) {
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return UseIntrinsic ? POPCNT_INTRINSIC(b) : sw_count_1s_max_15(b);
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}
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#endif // !defined(BITCOUNT_H_INCLUDED)
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@ -25,6 +25,7 @@
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#include <cassert>
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#include "bitbase.h"
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#include "bitcount.h"
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#include "endgame.h"
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@ -377,7 +378,7 @@ Value EvaluationFunction<KBBKN>::apply(const Position& pos) {
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result += Value(square_distance(bksq, nsq) * 32);
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// Bonus for restricting the knight's mobility
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result += Value((8 - count_1s_max_15(pos.piece_attacks<KNIGHT>(nsq))) * 8);
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result += Value((8 - count_1s_max_15<false>(pos.piece_attacks<KNIGHT>(nsq))) * 8);
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return (strongerSide == pos.side_to_move() ? result : -result);
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}
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@ -25,6 +25,7 @@
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#include <cassert>
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#include <cstring>
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#include "bitcount.h"
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#include "evaluate.h"
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#include "material.h"
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#include "pawns.h"
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@ -339,8 +340,8 @@ Value evaluate(const Position &pos, EvalInfo &ei, int threadID) {
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// Initialize pawn attack bitboards for both sides
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ei.attackedBy[WHITE][PAWN] = ((pos.pawns(WHITE) << 9) & ~FileABB) | ((pos.pawns(WHITE) << 7) & ~FileHBB);
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ei.attackedBy[BLACK][PAWN] = ((pos.pawns(BLACK) >> 7) & ~FileABB) | ((pos.pawns(BLACK) >> 9) & ~FileHBB);
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ei.kingAttackersCount[WHITE] = count_1s_max_15(ei.attackedBy[WHITE][PAWN] & ei.attackedBy[BLACK][KING])/2;
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ei.kingAttackersCount[BLACK] = count_1s_max_15(ei.attackedBy[BLACK][PAWN] & ei.attackedBy[WHITE][KING])/2;
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ei.kingAttackersCount[WHITE] = count_1s_max_15<false>(ei.attackedBy[WHITE][PAWN] & ei.attackedBy[BLACK][KING])/2;
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ei.kingAttackersCount[BLACK] = count_1s_max_15<false>(ei.attackedBy[BLACK][PAWN] & ei.attackedBy[WHITE][KING])/2;
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// Evaluate pieces
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for (Color c = WHITE; c <= BLACK; c++)
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@ -481,8 +482,8 @@ void init_eval(int threads) {
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for (Bitboard b = 0ULL; b < 256ULL; b++)
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{
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assert(count_1s(b) == int(uint8_t(count_1s(b))));
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BitCount8Bit[b] = (uint8_t)count_1s(b);
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assert(count_1s<false>(b) == int(uint8_t(count_1s<false>(b))));
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BitCount8Bit[b] = (uint8_t)count_1s<false>(b);
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}
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}
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@ -547,15 +548,15 @@ namespace {
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ei.kingAttackersWeight[us] += AttackWeight[Piece];
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Bitboard bb = (b & ei.attackedBy[them][KING]);
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if (bb)
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ei.kingAdjacentZoneAttacksCount[us] += count_1s_max_15(bb);
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ei.kingAdjacentZoneAttacksCount[us] += count_1s_max_15<false>(bb);
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}
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// Remove squares protected by enemy pawns
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Bitboard bb = (b & ~ei.attackedBy[them][PAWN]);
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// Mobility
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int mob = (Piece != QUEEN ? count_1s_max_15(bb & ~p.pieces_of_color(us))
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: count_1s(bb & ~p.pieces_of_color(us)));
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int mob = (Piece != QUEEN ? count_1s_max_15<false>(bb & ~p.pieces_of_color(us))
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: count_1s<false>(bb & ~p.pieces_of_color(us)));
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ei.mgMobility += Sign[us] * MgBonus[Piece][mob];
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ei.egMobility += Sign[us] * EgBonus[Piece][mob];
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@ -744,7 +745,7 @@ namespace {
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// quality of the pawn shelter.
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int attackUnits =
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Min((ei.kingAttackersCount[them] * ei.kingAttackersWeight[them]) / 2, 25)
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+ (ei.kingAdjacentZoneAttacksCount[them] + count_1s_max_15(undefended)) * 3
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+ (ei.kingAdjacentZoneAttacksCount[them] + count_1s_max_15<false>(undefended)) * 3
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+ InitKingDanger[relative_square(us, s)] - (shelter >> 5);
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// Analyse safe queen contact checks
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@ -760,7 +761,7 @@ namespace {
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{
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// The bitboard b now contains the squares available for safe queen
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// contact checks.
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int count = count_1s_max_15(b);
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int count = count_1s_max_15<false>(b);
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attackUnits += QueenContactCheckBonus * count * (sente ? 2 : 1);
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// Is there a mate threat?
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@ -800,12 +801,12 @@ namespace {
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// Queen checks
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b2 = b & ei.attacked_by(them, QUEEN);
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if( b2)
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attackUnits += QueenCheckBonus * count_1s_max_15(b2);
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attackUnits += QueenCheckBonus * count_1s_max_15<false>(b2);
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// Rook checks
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b2 = b & ei.attacked_by(them, ROOK);
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if (b2)
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attackUnits += RookCheckBonus * count_1s_max_15(b2);
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attackUnits += RookCheckBonus * count_1s_max_15<false>(b2);
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}
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if (QueenCheckBonus > 0 || BishopCheckBonus > 0)
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{
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@ -814,12 +815,12 @@ namespace {
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// Queen checks
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b2 = b & ei.attacked_by(them, QUEEN);
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if (b2)
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attackUnits += QueenCheckBonus * count_1s_max_15(b2);
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attackUnits += QueenCheckBonus * count_1s_max_15<false>(b2);
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// Bishop checks
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b2 = b & ei.attacked_by(them, BISHOP);
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if (b2)
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attackUnits += BishopCheckBonus * count_1s_max_15(b2);
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attackUnits += BishopCheckBonus * count_1s_max_15<false>(b2);
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}
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if (KnightCheckBonus > 0)
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{
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@ -828,7 +829,7 @@ namespace {
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// Knight checks
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b2 = b & ei.attacked_by(them, KNIGHT);
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if (b2)
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attackUnits += KnightCheckBonus * count_1s_max_15(b2);
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attackUnits += KnightCheckBonus * count_1s_max_15<false>(b2);
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}
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// Analyse discovered checks (only for non-pawns right now, consider
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@ -837,7 +838,7 @@ namespace {
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{
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b = p.discovered_check_candidates(them) & ~p.pawns();
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if (b)
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attackUnits += DiscoveredCheckBonus * count_1s_max_15(b) * (sente? 2 : 1);
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attackUnits += DiscoveredCheckBonus * count_1s_max_15<false>(b) * (sente? 2 : 1);
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}
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// Has a mate threat been found? We don't do anything here if the
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@ -972,7 +973,7 @@ namespace {
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if (d < 0)
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{
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int mtg = RANK_8 - relative_rank(us, s);
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int blockerCount = count_1s_max_15(squares_in_front_of(us,s) & pos.occupied_squares());
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int blockerCount = count_1s_max_15<false>(squares_in_front_of(us,s) & pos.occupied_squares());
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mtg += blockerCount;
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d += blockerCount;
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if (d < 0)
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@ -1133,8 +1134,8 @@ namespace {
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behindFriendlyPawns |= (behindFriendlyPawns << 16);
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}
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int space = count_1s_max_15(safeSquares)
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+ count_1s_max_15(behindFriendlyPawns & safeSquares);
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int space = count_1s_max_15<false>(safeSquares)
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||||
+ count_1s_max_15<false>(behindFriendlyPawns & safeSquares);
|
||||
|
||||
ei.mgValue += Sign[us] * apply_weight(Value(space * ei.mi->space_weight()), WeightSpace);
|
||||
}
|
||||
|
|
|
|||
|
|
@ -18,7 +18,7 @@
|
|||
*/
|
||||
|
||||
// To profile with callgrind uncomment following line
|
||||
//#define USE_CALLGRIND
|
||||
#define USE_CALLGRIND
|
||||
|
||||
|
||||
////
|
||||
|
|
|
|||
|
|
@ -25,6 +25,7 @@
|
|||
#include <cassert>
|
||||
#include <cstring>
|
||||
|
||||
#include "bitcount.h"
|
||||
#include "pawns.h"
|
||||
#include "position.h"
|
||||
|
||||
|
|
@ -329,8 +330,8 @@ PawnInfo *PawnInfoTable::get_pawn_info(const Position &pos) {
|
|||
// Test for candidate passed pawn
|
||||
candidate = !passed
|
||||
&& pos.file_is_half_open(them, f)
|
||||
&& ( count_1s_max_15(neighboring_files_bb(f) & (behind_bb(us, r) | rank_bb(r)) & ourPawns)
|
||||
- count_1s_max_15(neighboring_files_bb(f) & in_front_bb(us, r) & theirPawns)
|
||||
&& ( count_1s_max_15<false>(neighboring_files_bb(f) & (behind_bb(us, r) | rank_bb(r)) & ourPawns)
|
||||
- count_1s_max_15<false>(neighboring_files_bb(f) & in_front_bb(us, r) & theirPawns)
|
||||
>= 0);
|
||||
|
||||
// In order to prevent doubled passed pawns from receiving a too big
|
||||
|
|
|
|||
|
|
@ -27,6 +27,7 @@
|
|||
#include <fstream>
|
||||
#include <iostream>
|
||||
|
||||
#include "bitcount.h"
|
||||
#include "mersenne.h"
|
||||
#include "movegen.h"
|
||||
#include "movepick.h"
|
||||
|
|
@ -2090,7 +2091,7 @@ bool Position::is_ok(int* failedStep) const {
|
|||
|
||||
// Is there more than 2 checkers?
|
||||
if (failedStep) (*failedStep)++;
|
||||
if (debugCheckerCount && count_1s(st->checkersBB) > 2)
|
||||
if (debugCheckerCount && count_1s<false>(st->checkersBB) > 2)
|
||||
return false;
|
||||
|
||||
// Bitboards OK?
|
||||
|
|
@ -2165,7 +2166,7 @@ bool Position::is_ok(int* failedStep) const {
|
|||
if (debugPieceCounts)
|
||||
for (Color c = WHITE; c <= BLACK; c++)
|
||||
for (PieceType pt = PAWN; pt <= KING; pt++)
|
||||
if (pieceCount[c][pt] != count_1s(pieces_of_color_and_type(c, pt)))
|
||||
if (pieceCount[c][pt] != count_1s<false>(pieces_of_color_and_type(c, pt)))
|
||||
return false;
|
||||
|
||||
if (failedStep) (*failedStep)++;
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue