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 ;
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 -- use )
40 uses>> 2dup last-use? dup [ 2nip ] [ drop new-use ] if ;
42 GENERIC: covers? ( insn# obj -- ? )
44 M: f covers? 2drop f ;
46 M: live-range covers? [ from>> ] [ to>> ] bi between? ;
48 M: live-interval covers? ( insn# live-interval -- ? )
53 [ drop ] [ [ from>> <=> ] with search nip ] 2bi
57 : (find-use) ( insn# live-interval -- vreg-use )
58 uses>> [ n>> <=> ] with search nip ;
60 :: find-use ( insn# live-interval -- vreg-use )
61 insn# live-interval (find-use)
62 dup [ dup n>> insn# = [ drop f ] unless ] when ;
64 : add-new-range ( from to live-interval -- )
65 [ <live-range> ] dip ranges>> push ;
67 : shorten-range ( n live-interval -- )
69 [ dupd add-new-range ] [ ranges>> last from<< ] if ;
71 : extend-range ( from to live-range -- )
77 : extend-range? ( to live-interval -- ? )
78 ranges>> [ drop f ] [ last from>> >= ] if-empty ;
80 : add-range ( from to live-interval -- )
82 [ extend-range ] [ add-new-range ] if ;
84 : <live-interval> ( vreg reg-class -- live-interval )
91 : block-from ( bb -- n ) instructions>> first insn#>> 1 - ;
93 : block-to ( bb -- n ) instructions>> last insn#>> ;
97 ! Mapping from vreg to live-interval
98 SYMBOL: live-intervals
100 : live-interval ( vreg -- live-interval )
101 leader live-intervals get
102 [ dup rep-of reg-class-of <live-interval> ] cache ;
104 GENERIC: compute-live-intervals* ( insn -- )
106 M: insn compute-live-intervals* drop ;
108 :: record-def ( vreg n -- )
109 vreg live-interval :> live-interval
111 n live-interval shorten-range
112 n live-interval (add-use) vreg rep-of >>def-rep drop ;
114 :: record-use ( vreg n -- )
115 vreg live-interval :> live-interval
117 from get n live-interval add-range
118 n live-interval (add-use) vreg rep-of >>use-rep drop ;
120 :: record-temp ( vreg n -- )
121 vreg live-interval :> live-interval
123 n n live-interval add-range
124 n live-interval (add-use) vreg rep-of >>def-rep drop ;
126 M: vreg-insn compute-live-intervals* ( insn -- )
128 [ [ defs-vregs ] dip '[ _ record-def ] each ]
129 [ [ uses-vregs ] dip '[ _ record-use ] each ]
130 [ [ temp-vregs ] dip '[ _ record-temp ] each ]
133 : handle-live-out ( bb -- )
134 live-out dup assoc-empty? [ drop ] [
135 [ from get to get ] dip keys
136 [ live-interval add-range ] with with each
139 ! A location where all registers have to be spilled
140 TUPLE: sync-point n keep-dst? ;
142 C: <sync-point> sync-point
144 ! Sequence of sync points
147 GENERIC: compute-sync-points* ( insn -- )
149 M: hairy-clobber-insn compute-sync-points*
150 insn#>> f <sync-point> sync-points get push ;
152 M: clobber-insn compute-sync-points*
153 insn#>> t <sync-point> sync-points get push ;
155 M: insn compute-sync-points* drop ;
157 : compute-live-intervals-step ( bb -- )
159 [ block-from from set ]
163 instructions>> <reversed> [
164 [ compute-live-intervals* ]
165 [ compute-sync-points* ]
171 : init-live-intervals ( -- )
172 H{ } clone live-intervals set
173 V{ } clone sync-points set ;
175 : compute-start/end ( live-interval -- )
176 dup ranges>> [ first from>> ] [ last to>> ] bi
177 [ >>start ] [ >>end ] bi* drop ;
179 ERROR: bad-live-interval live-interval ;
181 : check-start ( live-interval -- )
182 dup start>> -1 = [ bad-live-interval ] [ drop ] if ;
184 : finish-live-intervals ( live-intervals -- seq )
185 ! Since live intervals are computed in a backward order, we have
186 ! to reverse some sequences, and compute the start and end.
189 [ [ { } like reverse! ] change-ranges drop ]
190 [ [ { } like reverse! ] change-uses drop ]
191 [ compute-start/end ]
196 : compute-live-intervals ( cfg -- live-intervals sync-points )
198 linearization-order <reversed> [ compute-live-intervals-step ] each
199 live-intervals get finish-live-intervals
202 : relevant-ranges ( interval1 interval2 -- ranges1 ranges2 )
203 [ [ ranges>> ] bi@ ] [ nip start>> ] 2bi '[ to>> _ >= ] filter ;
205 : intersect-live-range ( range1 range2 -- n/f )
206 2dup [ from>> ] bi@ > [ swap ] when
207 2dup [ to>> ] [ from>> ] bi* >= [ nip from>> ] [ 2drop f ] if ;
209 : intersect-live-ranges ( ranges1 ranges2 -- n )
211 { [ over empty? ] [ 2drop f ] }
212 { [ dup empty? ] [ 2drop f ] }
214 2dup [ first ] bi@ intersect-live-range dup [ 2nip ] [
216 2dup [ first from>> ] bi@ <
217 [ [ rest-slice ] dip ] [ rest-slice ] if
218 intersect-live-ranges
223 : intervals-intersect? ( interval1 interval2 -- ? )
224 relevant-ranges intersect-live-ranges >boolean ; inline