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Compute SplitPoint::spLevel on the fly

Browse source 
And retire a redundant field. This is important also
from a concept point of view becuase we want to keep
SMP structures as simple as possible with the only
strictly necessary data.

Verified with

dbg_hit_on(sp->spLevel != level)

that the values are 100% the same out of more 50K samples.

No functional change.
This commit is contained in:
Marco Costalba 2015-02-17 10:10:58 +01:00
parent 6656ed8904
commit dccaa145d2
3 changed files with 8 additions and 5 deletions
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9
src/search.cpp
View file

@ -1604,7 +1604,12 @@ void Thread::idle_loop() {
&& sp->slavesCount < MAX_SLAVES_PER_SPLITPOINT
&& available_to(Threads[i]))
{
int score = sp->spLevel * 256 * 256 + sp->slavesCount * 256 - sp->depth * 1;
// Compute the recursive split points chain size
int level = -1;
for (SplitPoint* spp = Threads[i]->activeSplitPoint; spp; spp = spp->parentSplitPoint)
level++;
int score = level * 256 * 256 + sp->slavesCount * 256 - sp->depth * 1;
if (score < bestScore)
{
@ -1618,7 +1623,7 @@ void Thread::idle_loop() {
if (bestSp)
{
sp = bestSp;
// Recheck the conditions under lock protection
Threads.mutex.lock();
sp->mutex.lock();

3
src/thread.cpp
View file

@ -154,7 +154,6 @@ void Thread::split(Position& pos, Stack* ss, Value alpha, Value beta, Value* bes
sp.masterThread = this;
sp.parentSplitPoint = activeSplitPoint;
sp.spLevel = activeSplitPoint ? activeSplitPoint->spLevel + 1 : 0;
sp.slavesMask = 0, sp.slavesMask.set(idx);
sp.slavesCount = 1;
sp.depth = depth;
@ -184,7 +183,7 @@ void Thread::split(Position& pos, Stack* ss, Value alpha, Value beta, Value* bes
Thread* slave;
while ( sp.slavesCount < MAX_SLAVES_PER_SPLITPOINT
while ( sp.slavesCount < MAX_SLAVES_PER_SPLITPOINT
&& (slave = Threads.available_slave(this)) != NULL)
{
sp.slavesMask.set(slave->idx);

1
src/thread.h
View file

@ -73,7 +73,6 @@ struct SplitPoint {
const Position* pos;
Search::Stack* ss;
Thread* masterThread;
int spLevel;
Depth depth;
Value beta;
int nodeType;