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Eliminate conditional branch from -fast variant of TR: map; 5% improvement on reverse-complement

db4
Slava Pestov 2008-12-05 23:52:47 -06:00
parent 82cf6530c6
commit 6ee523f48f
1 changed files with 18 additions and 5 deletions
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23
basis/tr/tr.factor
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@ -1,13 +1,25 @@
! Copyright (C) 2008 Slava Pestov.
! See http://factorcode.org/license.txt for BSD license.
USING: byte-arrays strings sequences sequences.private
fry kernel words parser lexer assocs math.order ;
fry kernel words parser lexer assocs math math.order summary ;
IN: tr
ERROR: bad-tr ;
M: bad-tr summary
drop "TR: can only be used with ASCII characters" ;
<PRIVATE
: ascii? ( ch -- ? ) 0 127 between? ; inline
: tr-nth ( n mapping -- ch ) nth-unsafe 127 bitand ; inline
: check-tr ( from to -- )
[ [ ascii? ] all? ] both? [ bad-tr ] unless ;
: compute-tr ( quot from to -- mapping )
zip [ 256 ] 2dip '[ [ @ _ at ] keep or ] B{ } map-as ; inline
zip [ 128 ] 2dip '[ [ @ _ at ] keep or ] B{ } map-as ; inline
: tr-hints ( word -- )
{ { byte-array } { string } } "specializer" set-word-prop ;
@ -16,13 +28,13 @@ IN: tr
create-in dup tr-hints ;
: tr-quot ( mapping -- quot )
'[ [ dup 0 255 between? [ _ nth-unsafe ] when ] map ] ;
'[ [ dup ascii? [ _ tr-nth ] when ] map ] ;
: define-tr ( word mapping -- )
tr-quot (( seq -- translated )) define-declared ;
: fast-tr-quot ( mapping -- quot )
'[ [ _ nth-unsafe ] change-each ] ;
'[ [ _ tr-nth ] change-each ] ;
: define-fast-tr ( word mapping -- )
fast-tr-quot (( seq -- )) define-declared ;
@ -32,6 +44,7 @@ PRIVATE>
: TR:
scan parse-definition
unclip-last [ unclip-last ] dip compute-tr
[ check-tr ]
[ [ create-tr ] dip define-tr ]
[ [ "-fast" append create-tr ] dip define-fast-tr ] 2bi ;
[ [ "-fast" append create-tr ] dip define-fast-tr ] 2tri ;
parsing