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Better annotate unlikely conditions

Browse source 
And in case of gcc we win also a small
speed optimization due to better branch
prediction.

No functional change.
This commit is contained in:
Marco Costalba 2013-07-15 20:50:24 +02:00
parent a6c5f60caa
commit cbb1a8ed31
3 changed files with 10 additions and 2 deletions
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2
src/evaluate.cpp
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@ -823,7 +823,7 @@ Value do_evaluate(const Position& pos, Value& margin) {
// If there is an enemy rook or queen attacking the pawn from behind, // If there is an enemy rook or queen attacking the pawn from behind,
// add all X-ray attacks by the rook or queen. Otherwise consider only // add all X-ray attacks by the rook or queen. Otherwise consider only
// the squares in the pawn's path attacked or occupied by the enemy. // the squares in the pawn's path attacked or occupied by the enemy.
if ( (forward_bb(Them, s) & pos.pieces(Them, ROOK, QUEEN)) // Unlikely if ( unlikely(forward_bb(Them, s) & pos.pieces(Them, ROOK, QUEEN))
&& (forward_bb(Them, s) & pos.pieces(Them, ROOK, QUEEN) & pos.attacks_from<ROOK>(s))) && (forward_bb(Them, s) & pos.pieces(Them, ROOK, QUEEN) & pos.attacks_from<ROOK>(s)))
unsafeSquares = squaresToQueen; unsafeSquares = squaresToQueen;
else else

2
src/search.cpp
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@ -1454,7 +1454,7 @@ moves_loop: // When in check and at SpNode search starts from here
| (attacks_bb<BISHOP>(m2to, occ) & pos.pieces(color_of(pc), QUEEN, BISHOP)); | (attacks_bb<BISHOP>(m2to, occ) & pos.pieces(color_of(pc), QUEEN, BISHOP));
// Verify attackers are triggered by our move and not already existing // Verify attackers are triggered by our move and not already existing
if (xray && (xray & ~pos.attacks_from<QUEEN>(m2to))) // Unlikely xray if (unlikely(xray) && (xray & ~pos.attacks_from<QUEEN>(m2to)))
return true; return true;
} }

8
src/types.h
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@ -71,6 +71,14 @@
# define FORCE_INLINE inline # define FORCE_INLINE inline
#endif #endif
#ifdef __GNUC__
# define likely(x) __builtin_expect(!!(x), 1)
# define unlikely(x) __builtin_expect(!!(x), 0)
#else
# define likely(x) (x)
# define unlikely(x) (x)
#endif
#if defined(USE_POPCNT) #if defined(USE_POPCNT)
const bool HasPopCnt = true; const bool HasPopCnt = true;
#else #else