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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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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: