1 ! Copyright (C) 2008, 2010 Slava Pestov.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: accessors assocs binary-search combinators
4 compiler.cfg.def-use compiler.cfg.instructions
5 compiler.cfg.linearization compiler.cfg.liveness
6 compiler.cfg.registers compiler.cfg.ssa.destruction.leaders cpu.architecture
7 fry kernel locals math math.intervals math.order namespaces sequences ;
8 IN: compiler.cfg.linear-scan.live-intervals
10 TUPLE: live-range from to ;
12 C: <live-range> live-range
14 TUPLE: vreg-use n def-rep use-rep spill-slot? ;
16 : <vreg-use> ( n -- vreg-use ) vreg-use new swap >>n ;
18 TUPLE: live-interval-state
20 reg spill-to spill-rep reload-from reload-rep
24 : first-use ( live-interval -- use ) uses>> first ; inline
26 : last-use ( live-interval -- use ) uses>> last ; inline
28 : new-use ( insn# uses -- use )
29 [ <vreg-use> dup ] dip push ;
31 : last-use? ( insn# uses -- use/f )
32 [ drop f ] [ last [ n>> = ] keep and ] if-empty ;
34 :: (add-use) ( insn# live-interval spill-slot? -- use )
35 live-interval uses>> :> uses
36 insn# uses last-use? [ insn# uses new-use ] unless*
37 spill-slot? [ t >>spill-slot? ] when ;
39 GENERIC: covers? ( insn# obj -- ? )
41 M: f covers? 2drop f ;
43 M: live-range covers? [ from>> ] [ to>> ] bi between? ;
45 M: live-interval-state covers? ( insn# live-interval -- ? )
50 [ drop ] [ [ from>> <=> ] with search nip ] 2bi
54 : (find-use) ( insn# live-interval -- vreg-use )
55 uses>> [ n>> <=> ] with search nip ;
57 :: find-use ( insn# live-interval -- vreg-use )
58 insn# live-interval (find-use)
59 dup [ dup n>> insn# = [ drop f ] unless ] when ;
61 : add-new-range ( from to live-interval -- )
62 [ <live-range> ] dip ranges>> push ;
64 : shorten-range ( n live-interval -- )
66 [ dupd add-new-range ] [ ranges>> last from<< ] if ;
68 : extend-range ( from to live-range -- )
74 : extend-range? ( to live-interval -- ? )
75 ranges>> [ drop f ] [ last from>> >= ] if-empty ;
77 : add-range ( from to live-interval -- )
79 [ extend-range ] [ add-new-range ] if ;
81 : <live-interval> ( vreg reg-class -- live-interval )
82 \ live-interval-state new
88 : block-from ( bb -- n ) instructions>> first insn#>> 1 - ;
90 : block-to ( bb -- n ) instructions>> last insn#>> ;
94 SYMBOL: live-intervals
96 : live-interval ( vreg -- live-interval )
97 leader live-intervals get
98 [ dup rep-of reg-class-of <live-interval> ] cache ;
100 GENERIC: compute-live-intervals* ( insn -- )
102 M: insn compute-live-intervals* drop ;
104 :: record-def ( vreg n spill-slot? -- )
105 vreg live-interval :> live-interval
107 n live-interval shorten-range
108 n live-interval spill-slot? (add-use) vreg rep-of >>def-rep drop ;
110 :: record-use ( vreg n spill-slot? -- )
111 vreg live-interval :> live-interval
113 from get n live-interval add-range
114 n live-interval spill-slot? (add-use) vreg rep-of >>use-rep drop ;
116 :: record-temp ( vreg n -- )
117 vreg live-interval :> live-interval
119 n n live-interval add-range
120 n live-interval f (add-use) vreg rep-of >>def-rep drop ;
122 M: vreg-insn compute-live-intervals* ( insn -- )
124 [ [ defs-vregs ] dip '[ _ f record-def ] each ]
125 [ [ uses-vregs ] dip '[ _ f record-use ] each ]
126 [ [ temp-vregs ] dip '[ _ record-temp ] each ]
129 ! Extend lifetime intervals of base pointers, so that their
130 ! values are available even if the base pointer is never used
133 GENERIC: uses-vregs* ( insn -- seq )
135 M: gc-map-insn uses-vregs*
136 [ uses-vregs ] [ gc-map>> derived-roots>> values ] bi append ;
138 M: vreg-insn uses-vregs* uses-vregs ;
140 M: insn uses-vregs* drop f ;
142 M: clobber-insn compute-live-intervals* ( insn -- )
144 [ [ defs-vregs ] dip '[ _ f record-def ] each ]
145 [ [ uses-vregs* ] dip '[ _ t record-use ] each ]
146 [ [ temp-vregs ] dip '[ _ record-temp ] each ]
149 M: hairy-clobber-insn compute-live-intervals* ( insn -- )
151 [ [ defs-vregs ] dip '[ _ t record-def ] each ]
152 [ [ uses-vregs* ] dip '[ _ t record-use ] each ]
153 [ [ temp-vregs ] dip '[ _ record-temp ] each ]
156 : handle-live-out ( bb -- )
157 live-out dup assoc-empty? [ drop ] [
158 [ from get to get ] dip keys
159 [ live-interval add-range ] 2with each
162 TUPLE: sync-point n keep-dst? ;
164 C: <sync-point> sync-point
168 GENERIC: compute-sync-points* ( insn -- )
170 M: hairy-clobber-insn compute-sync-points*
171 insn#>> f <sync-point> sync-points get push ;
173 M: clobber-insn compute-sync-points*
174 insn#>> t <sync-point> sync-points get push ;
176 M: insn compute-sync-points* drop ;
178 : compute-live-intervals-step ( bb -- )
180 [ block-from from set ]
184 instructions>> <reversed> [
185 [ compute-live-intervals* ]
186 [ compute-sync-points* ]
192 : init-live-intervals ( -- )
193 H{ } clone live-intervals set
194 V{ } clone sync-points set ;
196 : compute-start/end ( live-interval -- )
197 dup ranges>> [ first from>> ] [ last to>> ] bi
198 [ >>start ] [ >>end ] bi* drop ;
200 ERROR: bad-live-interval live-interval ;
202 : check-start ( live-interval -- )
203 dup start>> -1 = [ bad-live-interval ] [ drop ] if ;
205 : finish-live-intervals ( live-intervals -- seq )
208 [ [ { } like reverse! ] change-ranges drop ]
209 [ [ { } like reverse! ] change-uses drop ]
210 [ compute-start/end ]
215 : compute-live-intervals ( cfg -- live-intervals sync-points )
217 linearization-order <reversed> [ kill-block?>> ] reject
218 [ compute-live-intervals-step ] each
219 live-intervals get finish-live-intervals
222 : relevant-ranges ( interval1 interval2 -- ranges1 ranges2 )
223 [ [ ranges>> ] bi@ ] [ nip start>> ] 2bi '[ to>> _ >= ] filter ;
225 : intersect-live-range ( range1 range2 -- n/f )
226 2dup [ from>> ] bi@ > [ swap ] when
227 2dup [ to>> ] [ from>> ] bi* >= [ nip from>> ] [ 2drop f ] if ;
229 : intersect-live-ranges ( ranges1 ranges2 -- n )
231 { [ over empty? ] [ 2drop f ] }
232 { [ dup empty? ] [ 2drop f ] }
234 2dup [ first ] bi@ intersect-live-range dup [ 2nip ] [
236 2dup [ first from>> ] bi@ <
237 [ [ rest-slice ] dip ] [ rest-slice ] if
238 intersect-live-ranges
243 : intervals-intersect? ( interval1 interval2 -- ? )
244 relevant-ranges intersect-live-ranges >boolean ; inline