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
38 drop vreg vreg rep-of lookup-spill-slot
41 : vreg>reg ( vreg -- reg )
42 pending-interval-assoc get (vreg>reg) ;
44 : vregs>regs ( vregs -- assoc )
46 pending-interval-assoc get
47 '[ _ (vreg>reg) ] assoc-map
50 ! Minheap of live intervals which still need a register allocation
51 SYMBOL: unhandled-intervals
53 : add-unhandled ( live-interval -- )
54 dup start>> unhandled-intervals get heap-push ;
56 : init-unhandled ( live-intervals -- )
57 [ add-unhandled ] each ;
59 ! Mapping from basic blocks to values which are live at the start
60 SYMBOL: register-live-ins
62 ! Mapping from basic blocks to values which are live at the end
63 SYMBOL: register-live-outs
65 : init-assignment ( live-intervals -- )
66 <min-heap> pending-interval-heap set
67 H{ } clone pending-interval-assoc set
68 <min-heap> unhandled-intervals set
69 H{ } clone register-live-ins set
70 H{ } clone register-live-outs set
73 : insert-spill ( live-interval -- )
74 [ reg>> ] [ first-use 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 : insert-reload ( live-interval -- )
94 [ reg>> ] [ first-use rep>> ] [ reload-from>> ] tri ##reload ;
96 : insert-reload? ( live-interval -- ? )
97 ! Don't insert a reload if the register will be written to
98 ! before being read again.
101 [ first-use type>> +use+ eq? ]
104 : handle-reload ( live-interval -- )
105 dup insert-reload? [ insert-reload ] [ drop ] if ;
107 : activate-interval ( live-interval -- )
108 [ add-pending ] [ handle-reload ] bi ;
110 : (activate-new-intervals) ( n heap -- )
111 dup heap-empty? [ 2drop ] [
112 2dup heap-peek nip = [
113 dup heap-pop drop activate-interval
114 (activate-new-intervals)
118 : activate-new-intervals ( n -- )
119 unhandled-intervals get (activate-new-intervals) ;
121 : prepare-insn ( n -- )
122 [ expire-old-intervals ] [ activate-new-intervals ] bi ;
124 GENERIC: assign-registers-in-insn ( insn -- )
126 RENAMING: assign [ vreg>reg ] [ vreg>reg ] [ vreg>reg ]
128 M: vreg-insn assign-registers-in-insn
129 [ assign-insn-defs ] [ assign-insn-uses ] [ assign-insn-temps ] tri ;
131 M: ##call-gc assign-registers-in-insn
133 [ [ vreg>reg ] map ] change-gc-roots drop ;
135 M: insn assign-registers-in-insn drop ;
137 : begin-block ( bb -- )
139 dup block-from activate-new-intervals
140 [ live-in vregs>regs ] keep register-live-ins get set-at ;
142 : end-block ( bb -- )
143 [ live-out vregs>regs ] keep register-live-outs get set-at ;
145 : vreg-at-start ( vreg bb -- state )
146 register-live-ins get at ?at [ bad-vreg ] unless ;
148 : vreg-at-end ( vreg bb -- state )
149 register-live-outs get at ?at [ bad-vreg ] unless ;
151 :: assign-registers-in-block ( bb -- )
157 [ insn#>> 1 - prepare-insn ]
158 [ insn#>> prepare-insn ]
159 [ assign-registers-in-insn ]
165 ] change-instructions drop ;
167 : assign-registers ( live-intervals cfg -- )
168 [ init-assignment ] dip
169 linearization-order [ assign-registers-in-block ] each ;