1 ! Copyright (C) 2008, 2010 Slava Pestov.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: accessors kernel math assocs namespaces sequences heaps
4 fry make combinators combinators.short-circuit sets locals arrays
5 cpu.architecture layouts
10 compiler.cfg.instructions
11 compiler.cfg.renaming.functor
12 compiler.cfg.linearization.order
13 compiler.cfg.linear-scan.allocation
14 compiler.cfg.linear-scan.allocation.state
15 compiler.cfg.linear-scan.live-intervals ;
16 FROM: namespaces => set ;
17 IN: compiler.cfg.linear-scan.assignment
19 ! This contains both active and inactive intervals; any interval
20 ! such that start <= insn# <= end is in this set.
21 SYMBOL: pending-interval-heap
22 SYMBOL: pending-interval-assoc
24 : add-pending ( live-interval -- )
25 [ dup end>> pending-interval-heap get heap-push ]
26 [ [ reg>> ] [ vreg>> ] bi pending-interval-assoc get set-at ]
29 : remove-pending ( live-interval -- )
30 vreg>> pending-interval-assoc get delete-at ;
32 ERROR: bad-vreg vreg ;
34 : (vreg>reg) ( vreg pending -- reg )
35 ! If a live vreg is not in the pending set, then it must
37 ?at [ spill-slots get ?at [ ] [ bad-vreg ] if ] unless ;
39 : vreg>reg ( vreg -- reg )
40 pending-interval-assoc get (vreg>reg) ;
42 : vregs>regs ( vregs -- assoc )
44 pending-interval-assoc get
45 '[ _ (vreg>reg) ] assoc-map
48 ! Minheap of live intervals which still need a register allocation
49 SYMBOL: unhandled-intervals
51 : add-unhandled ( live-interval -- )
52 dup start>> unhandled-intervals get heap-push ;
54 : init-unhandled ( live-intervals -- )
55 [ add-unhandled ] each ;
57 ! Mapping from basic blocks to values which are live at the start
58 SYMBOL: register-live-ins
60 ! Mapping from basic blocks to values which are live at the end
61 SYMBOL: register-live-outs
63 : init-assignment ( live-intervals -- )
64 <min-heap> pending-interval-heap set
65 H{ } clone pending-interval-assoc set
66 <min-heap> unhandled-intervals set
67 H{ } clone register-live-ins set
68 H{ } clone register-live-outs set
71 : spill-rep ( live-interval -- rep ) vreg>> rep-of ;
73 : insert-spill ( live-interval -- )
74 [ reg>> ] [ spill-rep ] [ spill-to>> ] tri ##spill ;
76 : handle-spill ( live-interval -- )
77 dup spill-to>> [ insert-spill ] [ drop ] if ;
79 : expire-interval ( live-interval -- )
80 [ remove-pending ] [ handle-spill ] bi ;
82 : (expire-old-intervals) ( n heap -- )
83 dup heap-empty? [ 2drop ] [
84 2dup heap-peek nip <= [ 2drop ] [
85 dup heap-pop drop expire-interval
86 (expire-old-intervals)
90 : expire-old-intervals ( n -- )
91 pending-interval-heap get (expire-old-intervals) ;
93 : reload-rep ( live-interval -- rep ) vreg>> rep-of ;
95 : insert-reload ( live-interval -- )
96 [ reg>> ] [ reload-rep ] [ reload-from>> ] tri ##reload ;
98 : insert-reload? ( live-interval -- ? )
99 ! Don't insert a reload if the register will be written to
100 ! before being read again.
103 [ first-use type>> +use+ eq? ]
106 : handle-reload ( live-interval -- )
107 dup insert-reload? [ insert-reload ] [ drop ] if ;
109 : activate-interval ( live-interval -- )
110 [ add-pending ] [ handle-reload ] bi ;
112 : (activate-new-intervals) ( n heap -- )
113 dup heap-empty? [ 2drop ] [
114 2dup heap-peek nip = [
115 dup heap-pop drop activate-interval
116 (activate-new-intervals)
120 : activate-new-intervals ( n -- )
121 unhandled-intervals get (activate-new-intervals) ;
123 : prepare-insn ( n -- )
124 [ expire-old-intervals ] [ activate-new-intervals ] bi ;
126 GENERIC: assign-registers-in-insn ( insn -- )
128 RENAMING: assign [ vreg>reg ] [ vreg>reg ] [ vreg>reg ]
130 M: vreg-insn assign-registers-in-insn
131 [ assign-insn-defs ] [ assign-insn-uses ] [ assign-insn-temps ] tri ;
133 M: ##call-gc assign-registers-in-insn
135 [ [ vreg>reg ] map ] change-gc-roots drop ;
137 M: insn assign-registers-in-insn drop ;
139 : begin-block ( bb -- )
141 dup block-from activate-new-intervals
142 [ live-in vregs>regs ] keep register-live-ins get set-at ;
144 : end-block ( bb -- )
145 [ live-out vregs>regs ] keep register-live-outs get set-at ;
147 : vreg-at-start ( vreg bb -- state )
148 register-live-ins get at ?at [ bad-vreg ] unless ;
150 : vreg-at-end ( vreg bb -- state )
151 register-live-outs get at ?at [ bad-vreg ] unless ;
153 :: assign-registers-in-block ( bb -- )
159 [ insn#>> 1 - prepare-insn ]
160 [ insn#>> prepare-insn ]
161 [ assign-registers-in-insn ]
167 ] change-instructions drop ;
169 : assign-registers ( live-intervals cfg -- )
170 [ init-assignment ] dip
171 linearization-order [ assign-registers-in-block ] each ;