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Use a flag in TT to track null search values

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Add VALUE_TYPE_NS_LO to enum ValueType and use it when
saving in TT a value from a null search.

Currently no action is performed, the next patch will enable
the new type.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2010-04-10 09:53:08 +01:00
parent a9e9746495
commit 06a350f1ae
3 changed files with 12 additions and 9 deletions
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2
src/search.cpp
View file

@ -1388,7 +1388,7 @@ namespace {
{
assert(value_to_tt(nullValue, ply) == nullValue);
TT.store(posKey, nullValue, VALUE_TYPE_LOWER, depth, MOVE_NONE);
TT.store(posKey, nullValue, VALUE_TYPE_NS_LO, depth, MOVE_NONE);
return nullValue;
}
} else {

8
src/tt.h
View file

@ -46,8 +46,8 @@
/// the 32 bits of the data field are so defined
///
/// bit 0-16: move
/// bit 17-19: not used
/// bit 20-22: value type
/// bit 17-18: not used
/// bit 19-22: value type
/// bit 23-31: generation
class TTEntry {
@ -55,14 +55,14 @@ class TTEntry {
public:
TTEntry() {}
TTEntry(uint32_t k, Value v, ValueType t, Depth d, Move m, int generation)
: key_ (k), data((m & 0x1FFFF) | (t << 20) | (generation << 23)),
: key_ (k), data((m & 0x1FFFF) | (t << 19) | (generation << 23)),
value_(int16_t(v)), depth_(int16_t(d)) {}
uint32_t key() const { return key_; }
Depth depth() const { return Depth(depth_); }
Move move() const { return Move(data & 0x1FFFF); }
Value value() const { return Value(value_); }
ValueType type() const { return ValueType((data >> 20) & 7); }
ValueType type() const { return ValueType((data >> 19) & 0xF); }
int generation() const { return (data >> 23); }
private:

11
src/value.h
View file

@ -33,13 +33,16 @@
////
enum ValueType {
VALUE_TYPE_NONE = 0,
VALUE_TYPE_NONE = 0,
VALUE_TYPE_UPPER = 1, // Upper bound
VALUE_TYPE_LOWER = 2, // Lower bound
VALUE_TYPE_EXACT = 3, // Exact score
VALUE_TYPE_EVAL = 4, // Evaluation cache
VALUE_TYPE_EV_UP = 5, // Evaluation cache for upper bound
VALUE_TYPE_EV_LO = 6 // Evaluation cache for lower bound
VALUE_TYPE_EVAL = 4, // Static evaluation value
VALUE_TYPE_NULL = 8, // Null search value
VALUE_TYPE_EV_UP = VALUE_TYPE_EVAL | VALUE_TYPE_UPPER,
VALUE_TYPE_EV_LO = VALUE_TYPE_EVAL | VALUE_TYPE_LOWER,
VALUE_TYPE_NS_LO = VALUE_TYPE_NULL | VALUE_TYPE_LOWER,
};