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.linearization.order
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 start end ranges uses ;
18 GENERIC: covers? ( insn# obj -- ? )
20 M: f covers? 2drop f ;
22 M: live-range covers? [ from>> ] [ to>> ] bi between? ;
24 M: live-interval covers? ( insn# live-interval -- ? )
29 [ drop ] [ [ from>> <=> ] with search nip ] 2bi
33 ERROR: dead-value-error vreg ;
35 : add-new-range ( from to live-interval -- )
36 [ <live-range> ] dip ranges>> push ;
38 : shorten-range ( n live-interval -- )
40 [ dupd add-new-range ] [ ranges>> last (>>from) ] if ;
42 : extend-range ( from to live-range -- )
48 : extend-range? ( to live-interval -- ? )
49 ranges>> [ drop f ] [ last from>> >= ] if-empty ;
51 : add-range ( from to live-interval -- )
53 [ extend-range ] [ add-new-range ] if ;
55 GENERIC: operands-in-registers? ( insn -- ? )
57 M: vreg-insn operands-in-registers? drop t ;
59 M: partial-sync-insn operands-in-registers? drop f ;
61 : add-def ( insn live-interval -- )
62 [ insn#>> ] [ uses>> ] bi* push ;
64 : add-use ( insn live-interval -- )
65 ! Every use is a potential def, no SSA here baby!
66 over operands-in-registers? [ add-def ] [ 2drop ] if ;
68 : <live-interval> ( vreg -- live-interval )
74 : block-from ( bb -- n ) instructions>> first insn#>> 1 - ;
76 : block-to ( bb -- n ) instructions>> last insn#>> ;
78 M: live-interval hashcode*
79 nip [ start>> ] [ end>> 1000 * ] bi + ;
81 ! Mapping from vreg to live-interval
82 SYMBOL: live-intervals
84 : live-interval ( vreg -- live-interval )
85 live-intervals get [ <live-interval> ] cache ;
87 GENERIC: compute-live-intervals* ( insn -- )
89 M: insn compute-live-intervals* drop ;
91 : handle-output ( insn vreg -- )
93 [ [ insn#>> ] dip shorten-range ] [ add-def ] 2bi ;
95 : handle-input ( insn vreg -- )
97 [ [ [ basic-block get block-from ] dip insn#>> ] dip add-range ] [ add-use ] 2bi ;
99 : handle-temp ( insn vreg -- )
101 [ [ insn#>> dup ] dip add-range ] [ add-use ] 2bi ;
103 M: vreg-insn compute-live-intervals*
104 [ dup defs-vreg [ handle-output ] with when* ]
105 [ dup uses-vregs [ handle-input ] with each ]
106 [ dup temp-vregs [ handle-temp ] with each ]
109 : handle-live-out ( bb -- )
110 [ block-from ] [ block-to ] [ live-out keys ] tri
111 [ live-interval add-range ] with with each ;
113 ! A location where all registers have to be spilled
114 TUPLE: sync-point n ;
116 C: <sync-point> sync-point
118 ! Sequence of sync points
121 GENERIC: compute-sync-points* ( insn -- )
123 M: partial-sync-insn compute-sync-points*
124 insn#>> <sync-point> sync-points get push ;
126 M: insn compute-sync-points* drop ;
128 : compute-live-intervals-step ( bb -- )
132 instructions>> <reversed> [
133 [ compute-live-intervals* ]
134 [ compute-sync-points* ]
139 : init-live-intervals ( -- )
140 H{ } clone live-intervals set
141 V{ } clone sync-points set ;
143 : compute-start/end ( live-interval -- )
144 dup ranges>> [ first from>> ] [ last to>> ] bi
145 [ >>start ] [ >>end ] bi* drop ;
147 ERROR: bad-live-interval live-interval ;
149 : check-start ( live-interval -- )
150 dup start>> -1 = [ bad-live-interval ] [ drop ] if ;
152 : finish-live-intervals ( live-intervals -- seq )
153 ! Since live intervals are computed in a backward order, we have
154 ! to reverse some sequences, and compute the start and end.
157 [ ranges>> reverse-here ]
158 [ uses>> reverse-here ]
159 [ compute-start/end ]
164 : compute-live-intervals ( cfg -- live-intervals sync-points )
166 linearization-order <reversed> [ compute-live-intervals-step ] each
167 live-intervals get finish-live-intervals
170 : relevant-ranges ( interval1 interval2 -- ranges1 ranges2 )
171 [ [ ranges>> ] bi@ ] [ nip start>> ] 2bi '[ to>> _ >= ] filter ;
173 : intersect-live-range ( range1 range2 -- n/f )
174 2dup [ from>> ] bi@ > [ swap ] when
175 2dup [ to>> ] [ from>> ] bi* >= [ nip from>> ] [ 2drop f ] if ;
177 : intersect-live-ranges ( ranges1 ranges2 -- n )
179 { [ over empty? ] [ 2drop f ] }
180 { [ dup empty? ] [ 2drop f ] }
182 2dup [ first ] bi@ intersect-live-range dup [ 2nip ] [
184 2dup [ first from>> ] bi@ <
185 [ [ rest-slice ] dip ] [ rest-slice ] if
186 intersect-live-ranges
191 : intervals-intersect? ( interval1 interval2 -- ? )
192 relevant-ranges intersect-live-ranges >boolean ; inline