1 ! Copyright (C) 2008, 2009 Slava Pestov.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: namespaces kernel assocs accessors sequences math math.order fry
4 combinators compiler.cfg.instructions compiler.cfg.registers
5 compiler.cfg.def-use compiler.cfg.liveness compiler.cfg ;
6 IN: compiler.cfg.linear-scan.live-intervals
8 TUPLE: live-range from to ;
10 C: <live-range> live-range
14 reg spill-to reload-from
15 split-before split-after split-next
19 : covers? ( insn# live-interval -- ? )
20 ranges>> [ [ from>> ] [ to>> ] bi between? ] with any? ;
22 : child-interval-at ( insn# interval -- interval' )
24 2dup split-after>> start>> <
25 [ split-before>> ] [ split-after>> ] if
29 ERROR: dead-value-error vreg ;
31 : shorten-range ( n live-interval -- )
33 [ vreg>> dead-value-error ] [ ranges>> last (>>from) ] if ;
35 : extend-range ( from to live-range -- )
41 : add-new-range ( from to live-interval -- )
42 [ <live-range> ] dip ranges>> push ;
44 : extend-range? ( to live-interval -- ? )
45 ranges>> [ drop f ] [ last from>> >= ] if-empty ;
47 : add-range ( from to live-interval -- )
49 [ extend-range ] [ add-new-range ] if ;
51 : add-use ( n live-interval -- )
54 : <live-interval> ( vreg -- live-interval )
60 : block-from ( bb -- n ) instructions>> first insn#>> 1 - ;
62 : block-to ( bb -- n ) instructions>> last insn#>> ;
64 M: live-interval hashcode*
65 nip [ start>> ] [ end>> 1000 * ] bi + ;
67 M: live-interval clone
68 call-next-method [ clone ] change-uses ;
70 ! Mapping from vreg to live-interval
71 SYMBOL: live-intervals
73 : live-interval ( vreg live-intervals -- live-interval )
74 [ <live-interval> ] cache ;
76 GENERIC: compute-live-intervals* ( insn -- )
78 M: insn compute-live-intervals* drop ;
80 : handle-output ( n vreg live-intervals -- )
82 [ add-use ] [ shorten-range ] 2bi ;
84 : handle-input ( n vreg live-intervals -- )
86 [ [ basic-block get block-from ] 2dip add-range ] [ add-use ] 2bi ;
88 : handle-temp ( n vreg live-intervals -- )
90 [ dupd add-range ] [ add-use ] 2bi ;
92 M: vreg-insn compute-live-intervals*
95 [ [ defs-vregs ] 2dip '[ [ _ ] dip _ handle-output ] each ]
96 [ [ uses-vregs ] 2dip '[ [ _ ] dip _ handle-input ] each ]
97 [ [ temp-vregs ] 2dip '[ [ _ ] dip _ handle-temp ] each ]
100 : record-copy ( insn -- )
101 [ dst>> live-intervals get at ] [ src>> ] bi >>copy-from drop ;
103 M: ##copy compute-live-intervals*
104 [ call-next-method ] [ record-copy ] bi ;
106 M: ##copy-float compute-live-intervals*
107 [ call-next-method ] [ record-copy ] bi ;
109 : handle-live-out ( bb -- )
111 basic-block get [ block-from ] [ block-to ] bi
112 live-intervals get '[
113 [ _ _ ] dip _ live-interval add-range
116 : compute-live-intervals-step ( bb -- )
119 [ instructions>> <reversed> [ compute-live-intervals* ] each ] tri ;
121 : compute-start/end ( live-interval -- )
122 dup ranges>> [ first from>> ] [ last to>> ] bi
123 [ >>start ] [ >>end ] bi* drop ;
125 ERROR: bad-live-interval live-interval ;
127 : check-start ( live-interval -- )
128 dup start>> -1 = [ bad-live-interval ] [ drop ] if ;
130 : finish-live-intervals ( live-intervals -- )
131 ! Since live intervals are computed in a backward order, we have
132 ! to reverse some sequences, and compute the start and end.
135 [ ranges>> reverse-here ]
136 [ uses>> reverse-here ]
137 [ compute-start/end ]
142 : compute-live-intervals ( rpo -- live-intervals )
145 <reversed> [ compute-live-intervals-step ] each
146 ] keep values dup finish-live-intervals ;
148 : relevant-ranges ( interval1 interval2 -- ranges1 ranges2 )
149 [ [ ranges>> ] bi@ ] [ nip start>> ] 2bi '[ to>> _ >= ] filter ;
151 : intersect-live-range ( range1 range2 -- n/f )
152 2dup [ from>> ] bi@ > [ swap ] when
153 2dup [ to>> ] [ from>> ] bi* >= [ nip from>> ] [ 2drop f ] if ;
155 : intersect-live-ranges ( ranges1 ranges2 -- n )
157 { [ over empty? ] [ 2drop f ] }
158 { [ dup empty? ] [ 2drop f ] }
160 2dup [ first ] bi@ intersect-live-range dup [ 2nip ] [
162 2dup [ first from>> ] bi@ <
163 [ [ rest-slice ] dip ] [ rest-slice ] if
164 intersect-live-ranges
169 : intervals-intersect? ( interval1 interval2 -- ? )
170 relevant-ranges intersect-live-ranges >boolean ; inline