57 lines
1.5 KiB
Factor
57 lines
1.5 KiB
Factor
! Copyright (C) 2008, 2009 Slava Pestov.
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! See http://factorcode.org/license.txt for BSD license.
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USING: accessors assocs combinators combinators.short-circuit
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cpu.architecture kernel layouts locals make math namespaces sequences
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sets vectors fry compiler.cfg compiler.cfg.instructions
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compiler.cfg.rpo ;
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IN: compiler.cfg.utilities
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PREDICATE: kill-block < basic-block
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instructions>> {
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[ length 2 = ]
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[ first kill-vreg-insn? ]
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} 1&& ;
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: back-edge? ( from to -- ? )
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[ number>> ] bi@ >= ;
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: empty-block? ( bb -- ? )
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instructions>> {
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[ length 1 = ]
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[ first ##branch? ]
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} 1&& ;
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SYMBOL: visited
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: (skip-empty-blocks) ( bb -- bb' )
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dup visited get key? [
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dup empty-block? [
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dup visited get conjoin
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successors>> first (skip-empty-blocks)
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] when
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] unless ;
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: skip-empty-blocks ( bb -- bb' )
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H{ } clone visited [ (skip-empty-blocks) ] with-variable ;
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:: insert-basic-block ( from to bb -- )
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bb from 1vector >>predecessors drop
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bb to 1vector >>successors drop
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to predecessors>> [ dup from eq? [ drop bb ] when ] change-each
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from successors>> [ dup to eq? [ drop bb ] when ] change-each ;
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: <simple-block> ( insns -- bb )
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<basic-block>
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swap >vector
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\ ##branch new-insn over push
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>>instructions ;
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: has-phis? ( bb -- ? )
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instructions>> first ##phi? ;
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: cfg-has-phis? ( cfg -- )
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post-order [ has-phis? ] any? ;
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: if-has-phis ( bb quot: ( bb -- ) -- )
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[ dup has-phis? ] dip [ drop ] if ; inline
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