1 ! Copyright (C) 2008, 2010 Slava Pestov.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: accessors arrays assocs combinators compiler.cfg
4 compiler.cfg.linearization compiler.cfg.liveness compiler.cfg.registers
5 compiler.cfg.instructions compiler.cfg.linear-scan.allocation.state
6 compiler.cfg.linear-scan.live-intervals compiler.cfg.renaming.functor
7 compiler.cfg.ssa.destruction.leaders cpu.architecture
8 fry heaps kernel locals make math namespaces sequences sets ;
9 FROM: namespaces => set ;
10 IN: compiler.cfg.linear-scan.assignment
12 ! This contains both active and inactive intervals; any interval
13 ! such that start <= insn# <= end is in this set.
14 SYMBOL: pending-interval-heap
15 SYMBOL: pending-interval-assoc
17 : add-pending ( live-interval -- )
18 [ dup end>> pending-interval-heap get heap-push ]
19 [ [ reg>> ] [ vreg>> ] bi pending-interval-assoc get set-at ]
22 : remove-pending ( live-interval -- )
23 vreg>> pending-interval-assoc get delete-at ;
25 :: vreg>reg ( vreg -- reg/spill-slot )
27 leader pending-interval-assoc get at* [
28 drop leader vreg rep-of lookup-spill-slot
31 ERROR: not-spilled-error vreg ;
33 : vreg>spill-slot ( vreg -- spill-slot )
34 dup vreg>reg dup spill-slot? [ nip ] [ drop leader not-spilled-error ] if ;
36 : vregs>regs ( vregs -- assoc )
37 [ dup vreg>reg ] H{ } map>assoc ;
39 SYMBOL: unhandled-intervals
41 SYMBOL: machine-live-ins
43 : machine-live-in ( bb -- assoc )
44 machine-live-ins get at ;
46 : compute-live-in ( bb -- )
47 [ live-in keys vregs>regs ] keep machine-live-ins get set-at ;
49 SYMBOL: machine-edge-live-ins
51 : machine-edge-live-in ( predecessor bb -- assoc )
52 machine-edge-live-ins get at at ;
54 : compute-edge-live-in ( bb -- )
55 [ edge-live-ins get at [ keys vregs>regs ] assoc-map ] keep
56 machine-edge-live-ins get set-at ;
58 SYMBOL: machine-live-outs
60 : machine-live-out ( bb -- assoc )
61 machine-live-outs get at ;
63 : compute-live-out ( bb -- )
64 [ live-out keys vregs>regs ] keep machine-live-outs get set-at ;
66 : heap-pop-while ( heap quot: ( key -- ? ) -- values )
67 '[ dup heap-empty? [ f f ] [ dup heap-peek @ ] if ]
68 [ over heap-pop* ] produce 2nip ; inline
70 : insert-spill ( live-interval -- )
71 [ reg>> ] [ spill-rep>> ] [ spill-to>> ] tri ##spill, ;
73 : handle-spill ( live-interval -- )
74 dup spill-to>> [ insert-spill ] [ drop ] if ;
76 : expire-interval ( live-interval -- )
77 [ remove-pending ] [ handle-spill ] bi ;
79 : expire-old-intervals ( n -- )
80 pending-interval-heap get swap '[ _ < ] heap-pop-while
81 [ expire-interval ] each ;
83 : insert-reload ( live-interval -- )
84 [ reg>> ] [ reload-rep>> ] [ reload-from>> ] tri ##reload, ;
86 : handle-reload ( live-interval -- )
87 dup reload-from>> [ insert-reload ] [ drop ] if ;
89 : activate-interval ( live-interval -- )
90 [ add-pending ] [ handle-reload ] bi ;
92 : activate-new-intervals ( n -- )
93 unhandled-intervals get swap '[ _ = ] heap-pop-while
94 [ activate-interval ] each ;
96 : prepare-insn ( n -- )
97 [ expire-old-intervals ] [ activate-new-intervals ] bi ;
99 GENERIC: assign-registers-in-insn ( insn -- )
101 RENAMING: assign [ vreg>reg ] [ vreg>reg ] [ vreg>reg ]
103 M: vreg-insn assign-registers-in-insn
104 [ assign-insn-defs ] [ assign-insn-uses ] [ assign-insn-temps ] tri ;
106 : assign-gc-roots ( gc-map -- )
107 [ [ vreg>spill-slot ] map ] change-gc-roots drop ;
109 : assign-derived-roots ( gc-map -- )
110 [ [ [ vreg>spill-slot ] bi@ ] assoc-map ] change-derived-roots drop ;
112 M: gc-map-insn assign-registers-in-insn
113 [ [ assign-insn-defs ] [ assign-insn-uses ] [ assign-insn-temps ] tri ]
114 [ gc-map>> [ assign-gc-roots ] [ assign-derived-roots ] bi ]
117 M: insn assign-registers-in-insn drop ;
119 : begin-block ( bb -- )
122 [ block-from activate-new-intervals ]
123 [ compute-edge-live-in ]
127 :: assign-registers-in-block ( bb -- )
133 [ insn#>> 1 - prepare-insn ]
134 [ insn#>> prepare-insn ]
135 [ assign-registers-in-insn ]
140 ] change-instructions drop
142 bb compute-live-out ;
144 : init-assignment ( live-intervals -- )
145 [ [ start>> ] map ] keep zip >min-heap unhandled-intervals set
146 <min-heap> pending-interval-heap set
147 H{ } clone pending-interval-assoc set
148 H{ } clone machine-live-ins set
149 H{ } clone machine-edge-live-ins set
150 H{ } clone machine-live-outs set ;
152 : assign-registers ( cfg live-intervals -- )
154 linearization-order [ kill-block?>> not ] filter
155 [ assign-registers-in-block ] each ;