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Add perfect hash optimization for poker vocab

db4
Aaron Schaefer 2009-04-05 21:16:57 -04:00
parent 4a229e5205
commit fda3f6d3f0
3 changed files with 529 additions and 760 deletions
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1267
extra/poker/arrays/arrays.factor
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File diff suppressed because it is too large Load Diff

2
extra/poker/poker-tests.factor
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@ -8,9 +8,11 @@ IN: poker.tests
[ 7462 ] [ "7C 5D 4H 3S 2C" <hand> value>> ] unit-test
[ 1601 ] [ "KD QS JC TH 9S" <hand> value>> ] unit-test
[ 11 ] [ "AC AD AH AS KC" <hand> value>> ] unit-test
[ 9 ] [ "6C 5C 4C 3C 2C" <hand> value>> ] unit-test
[ 1 ] [ "AC KC QC JC TC" <hand> value>> ] unit-test
[ "High Card" ] [ "7C 5D 4H 3S 2C" <hand> >value ] unit-test
[ "Straight" ] [ "KD QS JC TH 9S" <hand> >value ] unit-test
[ "Four of a Kind" ] [ "AC AD AH AS KC" <hand> >value ] unit-test
[ "Straight Flush" ] [ "6C 5C 4C 3C 2C" <hand> >value ] unit-test

20
extra/poker/poker.factor
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@ -4,8 +4,10 @@ USING: accessors ascii binary-search combinators kernel locals math
math.bitwise math.order poker.arrays sequences splitting ;
IN: poker
! The algorithm used is based on Cactus Kev's Poker Hand Evaluator:
! The algorithm used is based on Cactus Kev's Poker Hand Evaluator with
! the Senzee Perfect Hash Optimization:
! http://www.suffecool.net/poker/evaluator.html
! http://www.senzee5.com/2006/06/some-perfect-hash.html
<PRIVATE
@ -124,14 +126,22 @@ CONSTANT: VALUE_STR { "" "Straight Flush" "Four of a Kind" "Full House" "Flush"
: prime-bits ( cards -- q )
[ HEX: FF bitand ] map-product ;
: perfect-hash-find ( q -- value )
#! magic to convert a hand's unique identifying bits to the
#! proper index for fast lookup in a table of hand values
HEX: E91AAA35 +
dup -16 shift bitxor
dup 8 shift w+
dup -4 shift bitxor
[ -8 shift HEX: 1FF bitand adjustments-table nth ]
[ dup 2 shift w+ -19 shift ] bi
bitxor values-table nth ;
: hand-value ( cards -- value )
{
{ [ dup flush? ] [ flushes-table lookup ] }
{ [ dup unique5? ] [ unique5-table lookup ] }
[
prime-bits products-table sorted-index
values-table nth
]
[ prime-bits perfect-hash-find ]
} cond ;
: >card-rank ( card -- str )