1 ! Copyright (C) 2008, 2010 Slava Pestov.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: namespaces kernel assocs accessors locals sequences math
4 math.order fry combinators binary-search
5 compiler.cfg.instructions
9 compiler.cfg.linearization
10 compiler.cfg.ssa.destruction
13 IN: compiler.cfg.linear-scan.live-intervals
15 TUPLE: live-range from to ;
17 C: <live-range> live-range
19 TUPLE: vreg-use n def-rep use-rep spill-slot? ;
21 : <vreg-use> ( n -- vreg-use ) vreg-use new swap >>n ;
25 reg spill-to spill-rep reload-from reload-rep
29 : first-use ( live-interval -- use ) uses>> first ; inline
31 : last-use ( live-interval -- use ) uses>> last ; inline
33 : new-use ( insn# uses -- use )
34 [ <vreg-use> dup ] dip push ;
36 : last-use? ( insn# uses -- use/f )
37 [ drop f ] [ last [ n>> = ] keep and ] if-empty ;
39 :: (add-use) ( insn# live-interval spill-slot? -- use )
40 live-interval uses>> :> uses
41 insn# uses last-use? [ insn# uses new-use ] unless*
42 spill-slot? [ t >>spill-slot? ] when ;
44 GENERIC: covers? ( insn# obj -- ? )
46 M: f covers? 2drop f ;
48 M: live-range covers? [ from>> ] [ to>> ] bi between? ;
50 M: live-interval covers? ( insn# live-interval -- ? )
55 [ drop ] [ [ from>> <=> ] with search nip ] 2bi
59 : (find-use) ( insn# live-interval -- vreg-use )
60 uses>> [ n>> <=> ] with search nip ;
62 :: find-use ( insn# live-interval -- vreg-use )
63 insn# live-interval (find-use)
64 dup [ dup n>> insn# = [ drop f ] unless ] when ;
66 : add-new-range ( from to live-interval -- )
67 [ <live-range> ] dip ranges>> push ;
69 : shorten-range ( n live-interval -- )
71 [ dupd add-new-range ] [ ranges>> last from<< ] if ;
73 : extend-range ( from to live-range -- )
79 : extend-range? ( to live-interval -- ? )
80 ranges>> [ drop f ] [ last from>> >= ] if-empty ;
82 : add-range ( from to live-interval -- )
84 [ extend-range ] [ add-new-range ] if ;
86 : <live-interval> ( vreg reg-class -- live-interval )
93 : block-from ( bb -- n ) instructions>> first insn#>> 1 - ;
95 : block-to ( bb -- n ) instructions>> last insn#>> ;
99 ! Mapping from vreg to live-interval
100 SYMBOL: live-intervals
102 : live-interval ( vreg -- live-interval )
103 leader live-intervals get
104 [ dup rep-of reg-class-of <live-interval> ] cache ;
106 GENERIC: compute-live-intervals* ( insn -- )
108 M: insn compute-live-intervals* drop ;
110 :: record-def ( vreg n spill-slot? -- )
111 vreg live-interval :> live-interval
113 n live-interval shorten-range
114 n live-interval spill-slot? (add-use) vreg rep-of >>def-rep drop ;
116 :: record-use ( vreg n spill-slot? -- )
117 vreg live-interval :> live-interval
119 from get n live-interval add-range
120 n live-interval spill-slot? (add-use) vreg rep-of >>use-rep drop ;
122 :: record-temp ( vreg n -- )
123 vreg live-interval :> live-interval
125 n n live-interval add-range
126 n live-interval f (add-use) vreg rep-of >>def-rep drop ;
128 M: vreg-insn compute-live-intervals* ( insn -- )
130 [ [ defs-vregs ] dip '[ _ f record-def ] each ]
131 [ [ uses-vregs ] dip '[ _ f record-use ] each ]
132 [ [ temp-vregs ] dip '[ _ record-temp ] each ]
135 ! Extend lifetime intervals of base pointers, so that their
136 ! values are available even if the base pointer is never used
139 GENERIC: uses-vregs* ( insn -- seq )
141 M: gc-map-insn uses-vregs* ( insn -- )
142 [ uses-vregs ] [ gc-map>> derived-roots>> values ] bi append ;
144 M: vreg-insn uses-vregs* uses-vregs ;
146 M: insn uses-vregs* drop f ;
148 M: clobber-insn compute-live-intervals* ( insn -- )
150 [ [ defs-vregs ] dip '[ _ f record-def ] each ]
151 [ [ uses-vregs* ] dip '[ _ t record-use ] each ]
152 [ [ temp-vregs ] dip '[ _ record-temp ] each ]
155 M: hairy-clobber-insn compute-live-intervals* ( insn -- )
157 [ [ defs-vregs ] dip '[ _ t record-def ] each ]
158 [ [ uses-vregs* ] dip '[ _ t record-use ] each ]
159 [ [ temp-vregs ] dip '[ _ record-temp ] each ]
162 : handle-live-out ( bb -- )
163 live-out dup assoc-empty? [ drop ] [
164 [ from get to get ] dip keys
165 [ live-interval add-range ] with with each
168 ! A location where all registers have to be spilled
169 TUPLE: sync-point n keep-dst? ;
171 C: <sync-point> sync-point
173 ! Sequence of sync points
176 GENERIC: compute-sync-points* ( insn -- )
178 M: hairy-clobber-insn compute-sync-points*
179 insn#>> f <sync-point> sync-points get push ;
181 M: clobber-insn compute-sync-points*
182 insn#>> t <sync-point> sync-points get push ;
184 M: insn compute-sync-points* drop ;
186 : compute-live-intervals-step ( bb -- )
187 dup kill-block?>> [ drop ] [
189 [ block-from from set ]
193 instructions>> <reversed> [
194 [ compute-live-intervals* ]
195 [ compute-sync-points* ]
202 : init-live-intervals ( -- )
203 H{ } clone live-intervals set
204 V{ } clone sync-points set ;
206 : compute-start/end ( live-interval -- )
207 dup ranges>> [ first from>> ] [ last to>> ] bi
208 [ >>start ] [ >>end ] bi* drop ;
210 ERROR: bad-live-interval live-interval ;
212 : check-start ( live-interval -- )
213 dup start>> -1 = [ bad-live-interval ] [ drop ] if ;
215 : finish-live-intervals ( live-intervals -- seq )
216 ! Since live intervals are computed in a backward order, we have
217 ! to reverse some sequences, and compute the start and end.
220 [ [ { } like reverse! ] change-ranges drop ]
221 [ [ { } like reverse! ] change-uses drop ]
222 [ compute-start/end ]
227 : compute-live-intervals ( cfg -- live-intervals sync-points )
229 linearization-order <reversed> [ compute-live-intervals-step ] each
230 live-intervals get finish-live-intervals
233 : relevant-ranges ( interval1 interval2 -- ranges1 ranges2 )
234 [ [ ranges>> ] bi@ ] [ nip start>> ] 2bi '[ to>> _ >= ] filter ;
236 : intersect-live-range ( range1 range2 -- n/f )
237 2dup [ from>> ] bi@ > [ swap ] when
238 2dup [ to>> ] [ from>> ] bi* >= [ nip from>> ] [ 2drop f ] if ;
240 : intersect-live-ranges ( ranges1 ranges2 -- n )
242 { [ over empty? ] [ 2drop f ] }
243 { [ dup empty? ] [ 2drop f ] }
245 2dup [ first ] bi@ intersect-live-range dup [ 2nip ] [
247 2dup [ first from>> ] bi@ <
248 [ [ rest-slice ] dip ] [ rest-slice ] if
249 intersect-live-ranges
254 : intervals-intersect? ( interval1 interval2 -- ? )
255 relevant-ranges intersect-live-ranges >boolean ; inline