1 ! Copyright (C) 2008, 2010 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.linearization.order
7 IN: compiler.cfg.linear-scan.live-intervals
9 TUPLE: live-range from to ;
11 C: <live-range> live-range
13 SYMBOLS: +def+ +use+ +memory+ ;
15 TUPLE: vreg-use n type ;
17 C: <vreg-use> vreg-use
21 reg spill-to reload-from
22 start end ranges uses ;
24 GENERIC: covers? ( insn# obj -- ? )
26 M: f covers? 2drop f ;
28 M: live-range covers? [ from>> ] [ to>> ] bi between? ;
30 M: live-interval covers? ( insn# live-interval -- ? )
35 [ drop ] [ [ from>> <=> ] with search nip ] 2bi
39 : add-new-range ( from to live-interval -- )
40 [ <live-range> ] dip ranges>> push ;
42 : shorten-range ( n live-interval -- )
44 [ dupd add-new-range ] [ ranges>> last (>>from) ] if ;
46 : extend-range ( from to live-range -- )
52 : extend-range? ( to live-interval -- ? )
53 ranges>> [ drop f ] [ last from>> >= ] if-empty ;
55 : add-range ( from to live-interval -- )
57 [ extend-range ] [ add-new-range ] if ;
59 : add-use ( insn live-interval type -- )
60 dup +memory+ eq? [ 3drop ] [
61 swap [ [ insn#>> ] dip <vreg-use> ] dip
65 : <live-interval> ( vreg -- live-interval )
71 : block-from ( bb -- n ) instructions>> first insn#>> 1 - ;
73 : block-to ( bb -- n ) instructions>> last insn#>> ;
75 ! Mapping from vreg to live-interval
76 SYMBOL: live-intervals
78 : live-interval ( vreg -- live-interval )
79 live-intervals get [ <live-interval> ] cache ;
81 GENERIC: compute-live-intervals* ( insn -- )
83 M: insn compute-live-intervals* drop ;
85 : handle-output ( insn vreg type -- )
87 [ drop [ insn#>> ] dip shorten-range ] [ add-use ] 3bi ;
89 : handle-input ( insn vreg type -- )
91 [ drop [ [ basic-block get block-from ] dip insn#>> ] dip add-range ]
95 : handle-temp ( insn vreg -- )
97 [ [ insn#>> dup ] dip add-range ] [ +def+ add-use ] 2bi ;
99 M: vreg-insn compute-live-intervals*
100 [ dup defs-vreg [ +def+ handle-output ] with when* ]
101 [ dup uses-vregs [ +use+ handle-input ] with each ]
102 [ dup temp-vregs [ handle-temp ] with each ]
105 M: partial-sync-insn compute-live-intervals*
106 [ dup defs-vreg [ +use+ handle-output ] with when* ]
107 [ dup uses-vregs [ +memory+ handle-input ] with each ]
108 [ dup temp-vregs [ handle-temp ] with each ]
111 : handle-live-out ( bb -- )
112 [ block-from ] [ block-to ] [ live-out keys ] tri
113 [ live-interval add-range ] with with each ;
115 ! A location where all registers have to be spilled
116 TUPLE: sync-point n ;
118 C: <sync-point> sync-point
120 ! Sequence of sync points
123 GENERIC: compute-sync-points* ( insn -- )
125 M: partial-sync-insn compute-sync-points*
126 insn#>> <sync-point> sync-points get push ;
128 M: insn compute-sync-points* drop ;
130 : compute-live-intervals-step ( bb -- )
134 instructions>> <reversed> [
135 [ compute-live-intervals* ]
136 [ compute-sync-points* ]
141 : init-live-intervals ( -- )
142 H{ } clone live-intervals set
143 V{ } clone sync-points set ;
145 : compute-start/end ( live-interval -- )
146 dup ranges>> [ first from>> ] [ last to>> ] bi
147 [ >>start ] [ >>end ] bi* drop ;
149 ERROR: bad-live-interval live-interval ;
151 : check-start ( live-interval -- )
152 dup start>> -1 = [ bad-live-interval ] [ drop ] if ;
154 : finish-live-intervals ( live-intervals -- seq )
155 ! Since live intervals are computed in a backward order, we have
156 ! to reverse some sequences, and compute the start and end.
159 [ ranges>> reverse! drop ]
160 [ uses>> reverse! drop ]
161 [ compute-start/end ]
166 : compute-live-intervals ( cfg -- live-intervals sync-points )
168 linearization-order <reversed> [ compute-live-intervals-step ] each
169 live-intervals get finish-live-intervals
172 : relevant-ranges ( interval1 interval2 -- ranges1 ranges2 )
173 [ [ ranges>> ] bi@ ] [ nip start>> ] 2bi '[ to>> _ >= ] filter ;
175 : intersect-live-range ( range1 range2 -- n/f )
176 2dup [ from>> ] bi@ > [ swap ] when
177 2dup [ to>> ] [ from>> ] bi* >= [ nip from>> ] [ 2drop f ] if ;
179 : intersect-live-ranges ( ranges1 ranges2 -- n )
181 { [ over empty? ] [ 2drop f ] }
182 { [ dup empty? ] [ 2drop f ] }
184 2dup [ first ] bi@ intersect-live-range dup [ 2nip ] [
186 2dup [ first from>> ] bi@ <
187 [ [ rest-slice ] dip ] [ rest-slice ] if
188 intersect-live-ranges
193 : intervals-intersect? ( interval1 interval2 -- ? )
194 relevant-ranges intersect-live-ranges >boolean ; inline