64 lines
1.9 KiB
Factor
64 lines
1.9 KiB
Factor
! Copyright (C) 2009, 2010 Slava Pestov.
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! See http://factorcode.org/license.txt for BSD license.
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USING: kernel namespaces deques accessors sets sequences assocs fry
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hashtables dlists compiler.cfg.def-use compiler.cfg.instructions
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compiler.cfg.rpo compiler.cfg.liveness compiler.cfg.utilities
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compiler.cfg.predecessors ;
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FROM: namespaces => set ;
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IN: compiler.cfg.liveness.ssa
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! TODO: merge with compiler.cfg.liveness
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! Assoc mapping basic blocks to sequences of sets of vregs; each sequence
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! is in correspondence with a predecessor
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SYMBOL: edge-live-ins
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: edge-live-in ( predecessor basic-block -- set ) edge-live-ins get at at ;
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SYMBOL: work-list
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: add-to-work-list ( basic-blocks -- )
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work-list get '[ _ push-front ] each ;
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: compute-live-in ( basic-block -- live-in )
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[ live-out ] keep instructions>> transfer-liveness ;
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: compute-edge-live-in ( basic-block -- edge-live-in )
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H{ } clone [
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'[ inputs>> [ swap _ conjoin-at ] assoc-each ] each-phi
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] keep ;
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: update-live-in ( basic-block -- changed? )
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[ [ compute-live-in ] keep live-ins get maybe-set-at ]
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[ [ compute-edge-live-in ] keep edge-live-ins get maybe-set-at ]
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bi or ;
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: compute-live-out ( basic-block -- live-out )
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[ successors>> [ live-in ] map ]
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[ dup successors>> [ edge-live-in ] with map ] bi
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append assoc-combine ;
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: update-live-out ( basic-block -- changed? )
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[ compute-live-out ] keep
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live-outs get maybe-set-at ;
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: liveness-step ( basic-block -- )
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dup update-live-out [
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dup update-live-in
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[ predecessors>> add-to-work-list ] [ drop ] if
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] [ drop ] if ;
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: compute-ssa-live-sets ( cfg -- )
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needs-predecessors
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<hashed-dlist> work-list set
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H{ } clone live-ins set
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H{ } clone edge-live-ins set
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H{ } clone live-outs set
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post-order add-to-work-list
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work-list get [ liveness-step ] slurp-deque ;
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: live-in? ( vreg bb -- ? ) live-in key? ;
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: live-out? ( vreg bb -- ? ) live-out key? ;
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