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 binary-search compiler.cfg.instructions compiler.cfg.registers
5 compiler.cfg.def-use compiler.cfg.liveness compiler.cfg.rpo
7 IN: compiler.cfg.linear-scan.live-intervals
9 TUPLE: live-range from to ;
11 C: <live-range> live-range
15 reg spill-to reload-from
16 split-before split-after split-next
20 GENERIC: covers? ( insn# obj -- ? )
22 M: f covers? 2drop f ;
24 M: live-range covers? [ from>> ] [ to>> ] bi between? ;
26 M: live-interval covers? ( insn# live-interval -- ? )
31 [ drop ] [ [ from>> <=> ] with search nip ] 2bi
35 ERROR: dead-value-error vreg ;
37 : shorten-range ( n live-interval -- )
39 [ vreg>> dead-value-error ] [ ranges>> last (>>from) ] if ;
41 : extend-range ( from to live-range -- )
47 : add-new-range ( from to live-interval -- )
48 [ <live-range> ] dip ranges>> push ;
50 : extend-range? ( to live-interval -- ? )
51 ranges>> [ drop f ] [ last from>> >= ] if-empty ;
53 : add-range ( from to live-interval -- )
55 [ extend-range ] [ add-new-range ] if ;
57 : add-use ( n live-interval -- )
60 : <live-interval> ( vreg -- live-interval )
66 : block-from ( bb -- n ) instructions>> first insn#>> 1 - ;
68 : block-to ( bb -- n ) instructions>> last insn#>> ;
70 M: live-interval hashcode*
71 nip [ start>> ] [ end>> 1000 * ] bi + ;
73 M: live-interval clone
74 call-next-method [ clone ] change-uses ;
76 ! Mapping from vreg to live-interval
77 SYMBOL: live-intervals
79 : live-interval ( vreg live-intervals -- live-interval )
80 [ <live-interval> ] cache ;
82 GENERIC: compute-live-intervals* ( insn -- )
84 M: insn compute-live-intervals* drop ;
86 : handle-output ( n vreg live-intervals -- )
88 [ add-use ] [ shorten-range ] 2bi ;
90 : handle-input ( n vreg live-intervals -- )
92 [ [ basic-block get block-from ] 2dip add-range ] [ add-use ] 2bi ;
94 : handle-temp ( n vreg live-intervals -- )
96 [ dupd add-range ] [ add-use ] 2bi ;
98 M: vreg-insn compute-live-intervals*
101 [ [ defs-vregs ] 2dip '[ [ _ ] dip _ handle-output ] each ]
102 [ [ uses-vregs ] 2dip '[ [ _ ] dip _ handle-input ] each ]
103 [ [ temp-vregs ] 2dip '[ [ _ ] dip _ handle-temp ] each ]
106 : record-copy ( insn -- )
107 [ dst>> live-intervals get at ] [ src>> ] bi >>copy-from drop ;
109 M: ##copy compute-live-intervals*
110 [ call-next-method ] [ record-copy ] bi ;
112 M: ##copy-float compute-live-intervals*
113 [ call-next-method ] [ record-copy ] bi ;
115 : handle-live-out ( bb -- )
117 basic-block get [ block-from ] [ block-to ] bi
118 live-intervals get '[
119 [ _ _ ] dip _ live-interval add-range
122 : compute-live-intervals-step ( bb -- )
125 [ instructions>> <reversed> [ compute-live-intervals* ] each ] tri ;
127 : compute-start/end ( live-interval -- )
128 dup ranges>> [ first from>> ] [ last to>> ] bi
129 [ >>start ] [ >>end ] bi* drop ;
131 ERROR: bad-live-interval live-interval ;
133 : check-start ( live-interval -- )
134 dup start>> -1 = [ bad-live-interval ] [ drop ] if ;
136 : finish-live-intervals ( live-intervals -- )
137 ! Since live intervals are computed in a backward order, we have
138 ! to reverse some sequences, and compute the start and end.
141 [ ranges>> reverse-here ]
142 [ uses>> reverse-here ]
143 [ compute-start/end ]
148 : compute-live-intervals ( cfg -- live-intervals )
151 post-order [ compute-live-intervals-step ] each
152 ] keep values dup finish-live-intervals ;
154 : relevant-ranges ( interval1 interval2 -- ranges1 ranges2 )
155 [ [ ranges>> ] bi@ ] [ nip start>> ] 2bi '[ to>> _ >= ] filter ;
157 : intersect-live-range ( range1 range2 -- n/f )
158 2dup [ from>> ] bi@ > [ swap ] when
159 2dup [ to>> ] [ from>> ] bi* >= [ nip from>> ] [ 2drop f ] if ;
161 : intersect-live-ranges ( ranges1 ranges2 -- n )
163 { [ over empty? ] [ 2drop f ] }
164 { [ dup empty? ] [ 2drop f ] }
166 2dup [ first ] bi@ intersect-live-range dup [ 2nip ] [
168 2dup [ first from>> ] bi@ <
169 [ [ rest-slice ] dip ] [ rest-slice ] if
170 intersect-live-ranges
175 : intervals-intersect? ( interval1 interval2 -- ? )
176 relevant-ranges intersect-live-ranges >boolean ; inline