1 ! Copyright (C) 2008, 2010 Slava Pestov.
2 ! See https://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.linear-scan.ranges compiler.cfg.linearization
6 compiler.cfg.liveness compiler.cfg.registers
7 compiler.cfg.ssa.destruction.leaders cpu.architecture kernel
8 math math.order namespaces sequences vectors ;
9 IN: compiler.cfg.linear-scan.live-intervals
11 TUPLE: vreg-use n def-rep use-rep spill-slot? ;
13 : <vreg-use> ( n -- vreg-use ) vreg-use new swap >>n ;
15 TUPLE: live-interval-state
17 reg spill-to spill-rep reload-from reload-rep
18 { ranges vector } { uses vector } ;
20 : first-use ( live-interval -- use ) uses>> first ; inline
22 : last-use ( live-interval -- use ) uses>> last ; inline
24 : new-use ( insn# uses -- use )
25 [ <vreg-use> dup ] dip push ;
27 : last-use? ( insn# uses -- use/f )
28 [ drop f ] [ last [ n>> = ] keep and ] if-empty ;
30 :: (add-use) ( insn# live-interval spill-slot? -- use )
31 live-interval uses>> :> uses
32 insn# uses last-use? [ insn# uses new-use ] unless*
33 spill-slot? [ t >>spill-slot? ] when ;
35 : (find-use) ( insn# live-interval -- vreg-use )
36 uses>> [ n>> <=> ] with search nip ;
38 :: find-use ( insn# live-interval -- vreg-use/f )
39 insn# live-interval (find-use)
40 [ dup n>> insn# = [ drop f ] unless ] ?call ;
42 : <live-interval> ( vreg -- live-interval )
43 \ live-interval-state new
48 : block-from ( bb -- n ) instructions>> first insn#>> 1 - ;
50 : block-to ( bb -- n ) instructions>> last insn#>> ;
54 SYMBOL: live-intervals
56 : vreg>live-interval ( vreg -- live-interval )
57 leader live-intervals get [ <live-interval> ] cache ;
59 : interval-reg-class ( live-interval -- reg-class )
60 vreg>> rep-of reg-class-of ;
62 GENERIC: compute-live-intervals* ( insn -- )
64 M: insn compute-live-intervals* drop ;
66 :: record-def ( vreg n spill-slot? -- )
67 vreg vreg>live-interval :> live-interval
69 n live-interval ranges>> shorten-ranges
70 n live-interval spill-slot? (add-use) vreg rep-of >>def-rep drop ;
72 :: record-use ( vreg n spill-slot? -- )
73 vreg vreg>live-interval :> live-interval
75 from get n live-interval ranges>> add-range
76 n live-interval spill-slot? (add-use) vreg rep-of >>use-rep drop ;
78 :: record-temp ( vreg n -- )
79 vreg vreg>live-interval :> live-interval
81 n n live-interval ranges>> add-range
82 n live-interval f (add-use) vreg rep-of >>def-rep drop ;
84 : uses-vregs* ( insn -- seq )
86 [ uses-vregs ] [ gc-map>> derived-roots>> values ] bi append
89 UNION: hairy-clobber-insn
101 M: vreg-insn compute-live-intervals* ( insn -- )
103 [ [ defs-vregs ] dip '[ _ f record-def ] each ]
104 [ [ uses-vregs* ] dip '[ _ f record-use ] each ]
105 [ [ temp-vregs ] dip '[ _ record-temp ] each ]
108 M: clobber-insn compute-live-intervals* ( insn -- )
110 [ [ defs-vregs ] dip '[ _ f record-def ] each ]
111 [ [ uses-vregs* ] dip '[ _ t record-use ] each ]
112 [ [ temp-vregs ] dip '[ _ record-temp ] each ]
115 M: hairy-clobber-insn compute-live-intervals* ( insn -- )
117 [ [ defs-vregs ] dip '[ _ t record-def ] each ]
118 [ [ uses-vregs* ] dip '[ _ t record-use ] each ]
119 [ [ temp-vregs ] dip '[ _ record-temp ] each ]
122 : handle-live-out ( bb -- )
123 [ from get to get ] dip live-out keys
124 [ vreg>live-interval ranges>> add-range ] 2with each ;
126 : compute-live-intervals-step ( bb -- )
128 [ block-from from set ]
131 [ instructions>> <reversed> [ compute-live-intervals* ] each ]
134 : live-interval-start ( live-interval -- n )
135 ranges>> first first ; inline
137 : live-interval-end ( live-interval -- n )
138 ranges>> last last ; inline
140 ERROR: bad-live-interval live-interval ;
142 : check-start ( live-interval -- )
143 dup live-interval-start -1 = [ bad-live-interval ] [ drop ] if ;
145 : finish-live-interval ( live-interval -- )
146 [ ranges>> reverse! ] [ uses>> reverse! ] [ check-start ] tri 2drop ;
148 TUPLE: sync-point n keep-dst? ;
150 GENERIC: insn>sync-point ( insn -- sync-point/f )
152 M: clobber-insn insn>sync-point
153 [ insn#>> ] [ hairy-clobber-insn? not ] bi sync-point boa ;
155 M: insn insn>sync-point drop f ;
157 : cfg>sync-points ( cfg -- sync-points )
158 cfg>insns [ insn>sync-point ] map sift ;
160 : cfg>live-intervals ( cfg -- live-intervals )
161 H{ } clone live-intervals set
162 linearization-order <reversed> [ compute-live-intervals-step ] each
163 live-intervals get values dup [ finish-live-interval ] each ;
165 : compute-live-intervals ( cfg -- intervals/sync-points )
166 [ cfg>live-intervals ] [ cfg>sync-points ] bi append ;
168 : intersect-intervals ( interval1 interval2 -- n/f )
169 [ ranges>> ] bi@ intersect-ranges ;
171 : intervals-intersect? ( interval1 interval2 -- ? )
172 intersect-intervals >boolean ; inline