101 lines
2.6 KiB
Factor
101 lines
2.6 KiB
Factor
! Copyright (C) 2009, 2010 Daniel Ehrenberg.
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! See http://factorcode.org/license.txt for BSD license.
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USING: accessors arrays assocs fry kernel locals make math
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namespaces sequences sets combinators.short-circuit
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compiler.cfg.def-use compiler.cfg.dependence
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compiler.cfg.instructions compiler.cfg.rpo cpu.architecture ;
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IN: compiler.cfg.scheduling
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! Instruction scheduling to reduce register pressure, from:
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! "Register-sensitive selection, duplication, and
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! sequencing of instructions"
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! by Vivek Sarkar, et al.
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! http://portal.acm.org/citation.cfm?id=377849
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ERROR: bad-delete-at key assoc ;
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: check-delete-at ( key assoc -- )
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2dup key? [ delete-at ] [ bad-delete-at ] if ;
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: set-parent-indices ( node -- )
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children>> building get length
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'[ _ >>parent-index drop ] each ;
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: remove-node ( node -- )
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[ follows>> members ] keep
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'[ [ precedes>> _ swap check-delete-at ] each ]
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[ [ ready? ] filter roots get push-all ] bi ;
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: score ( insn -- n )
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[ parent-index>> ] [ registers>> neg ] [ insn>> insn#>> ] tri 3array ;
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: pull-out-nth ( n seq -- elt )
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[ nth ] [ remove-nth! drop ] 2bi ;
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: select ( vector quot -- elt )
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! This could be sped up by a constant factor
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[ dup <enum> ] dip '[ _ call( insn -- score ) ] assoc-map
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dup values supremum '[ nip _ = ] assoc-find
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2drop swap pull-out-nth ; inline
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: select-instruction ( -- insn/f )
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roots get [ f ] [
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[ score ] select
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[ insn>> ]
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[ set-parent-indices ]
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[ remove-node ] tri
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] if-empty ;
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: (reorder) ( -- )
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select-instruction [
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, (reorder)
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] when* ;
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UNION: initial-insn ##phi ##inc-d ##inc-r ##callback-inputs ;
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UNION: final-insn
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##branch
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##dispatch
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conditional-branch-insn
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##safepoint
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##epilogue ##return
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##callback-outputs ;
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: initial-insn-end ( insns -- n )
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[ initial-insn? not ] find drop 0 or ;
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: final-insn-start ( insns -- n )
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[ final-insn? not ] find-last drop [ 1 + ] [ 0 ] if* ;
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:: split-3-ways ( insns -- first middle last )
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insns initial-insn-end :> a
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insns final-insn-start :> b
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insns a head-slice
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a b insns <slice>
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insns b tail-slice ;
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: reorder ( insns -- insns' )
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split-3-ways [
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build-dependence-graph
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build-fan-in-trees
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[ (reorder) ] V{ } make reverse
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] dip 3append ;
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: number-insns ( insns -- )
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[ >>insn# drop ] each-index ;
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: clear-numbers ( insns -- )
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[ f >>insn# drop ] each ;
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: schedule-block ( bb -- )
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[
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[ number-insns ]
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[ reorder ]
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[ clear-numbers ] tri
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] change-instructions drop ;
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: schedule-instructions ( cfg -- cfg' )
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dup [
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dup kill-block?>> [ drop ] [ schedule-block ] if
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] each-basic-block ;
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