Renamed stuff and added comments. The aim is to make more
readable, at least by me ;-) , this newly added part of code.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
It is more correct and specific. Another naming
improvement while reading Critter sources.
No functional changes.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Now that HasPopCnt is a compile time constant we can
centralize and unify the BitCountType selection.
Also rename count_1s() in the more standard popcount()
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
It was meant to build a single binary optimized
for any kind of CPU: with and without hardware POPCNT.
This is a nice idea but in practice was never used, or
people builds binary with popcnt enabled or not, mainly
according to their type of CPU. And it was also never
used in the official Jim's builds where, in case, would
be easier for a number of reasons, do build two different
versions: with and without SEE42 support.
So retire this feature and simplify the code.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Follow the suggested Qt style:
http://doc.qt.nokia.com/qq/qq13-apis.html
It seems to me simpler and easier to read.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
It's only necessary to do the checking at the end of every non-const
member (including the constructors and from_fen()) of class Position.
Once the post-condition of every modifier guarantees the class invariant,
we don't need to verify sanity of the position as preconditions for outside
callers such as movegen, search etc. For non-class types such as Move and
Square we still need to assert of course.
Suggested by Rein Halbersma.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
No functional change also in faked split mode
To be sure verified in real games with 4 threads TC 2"+0.1
After 11125 games 2497 - 2469 - 6159 ELO +0 (+- 4.4)
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Almost useless for the user and now is in sync with
the material value that is already weighted.
A small speedup of 0,4% because we avoid an apply_weight()
call in a fast path.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
The only interesting thing is that a backward or isolated
pawn cannot be a candidate passer, so code this condition.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
It is a redundant boiler plate, just call initialization and
resource release directly from main()
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Language guarantees that c'tor is called, but without any c'tor
it happens to work by accident because OS zeroes out the freshly
allocated pages. The problem is that if I deallocate and allocate
again, the second time pages are no more newly come by the OS and
so could contain stale info.
A practical case could be if we change TT size or numbers of
threads on the fly while already running.
Bug spotted by Justin Blanchard.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Get rid of macros and use templates instead,
this is safer and allows us fix the warning:
ISO C++ forbids braced-groups within expressions
That broke compilation with -pedantic flag under
gcc and POPCNT enabled.
No functional and no performance change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
More then 100 lines of almost useless evaluations. Prefer
code semplification to a very small and dubious advantage.
After 7457 games on russian cluster:
Mod - Orig: 1285 - 1334 - 4838 ELO -2 (+- 3.2)
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Plus a bunch of other minor optimizations.
With this power pack we have an increase
of a whopping 1.4% :-)
...and it took 3 good hours of profiling + hacking to get it out !
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Doing the conversion the compiler is now able to
spot two possible ambiguity calls that now we can
easily fix.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Improvement is easily in error bar and there is
some added complexity making future changes more
difficult.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Because not all backward pawns are the same ;-) if the
blocking enemy pawn is near then our pawn is more backward
than another whose enemy pawn is far away so that can advance
for some sqaures.
After 2925 games at 30"+0 on my QUAD
Mod vs Orig +602 =1745 -578 +3 ELO
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
It is more clear and also more correct because we
consider enemy pawns only in fornt of us and not just
on our file.
Very small functional change, almost not measurable, but
keep the patch for documenting purposes.
Spotted by Marek Kwiatkowski.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
It happens that when d == 0 we calculate:
log(double(0 * 0) / 2)
Unfortunately, log(0) is "illegal" and can generate either a
floating point exception or return a nonsense "huge" value
depending on the platform.
This fixs in the proper way the GCC/ICC rounding difference,
bug was from our side, not in the intel compiler.
Also fixed some few other warnings.
Bug spotted by Richard Lloyd.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
It was erroneusly reversed. Bug from Glaurung times.
Probably a full re-tuning is needed anyhow.
Spotted and fixed by Ralph Stoesser.
After 999 games almost no change, but modified anyway
for documentation reasons.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This is a more standard naming (see chessprogramming wiki)
and is more stick to what table is and not what is used for.
Code in pawns.cpp is a bit more readable now, at least for me ;-)
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Avoid a double bitcount in test for candidate passed
pawn when we don't have any supporting pawn.
Also use outpost_mask() instead of build it up on
the fly.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Also fix dimension of UnpairedPawnsTable[] to accomodate the
case in which we have 8 unpaired pawns, i.e. only one side has
pawns, the other side has no pawns.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
The idea is to reduce the score if we have many
pawns opposing an enemy pawn so that the draw
possibility increases.
Just introduced the logic, but no functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
A pawn is candidate to be passed if doesn't have enemy pawns
in just front of him, not also behind !
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Absolutely no useful at all, just code obfuscation so
use real definition instead.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
In this form it is even more evident we have some
issue there to be fixed sooner then later....
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
