35 lines
1.1 KiB
Factor
35 lines
1.1 KiB
Factor
! Copyright (C) 2008, 2010 Slava Pestov.
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! See http://factorcode.org/license.txt for BSD license.
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USING: kernel accessors sequences math combinators
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combinators.short-circuit vectors compiler.cfg
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compiler.cfg.instructions compiler.cfg.rpo
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compiler.cfg.utilities ;
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IN: compiler.cfg.useless-conditionals
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: delete-conditional? ( bb -- ? )
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{
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[
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instructions>> last {
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[ ##compare-branch? ]
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[ ##compare-imm-branch? ]
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[ ##compare-integer-branch? ]
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[ ##compare-integer-imm-branch? ]
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[ ##compare-float-ordered-branch? ]
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[ ##compare-float-unordered-branch? ]
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} 1||
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]
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[ successors>> first2 [ skip-empty-blocks ] bi@ eq? ]
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} 1&& ;
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: delete-conditional ( bb -- )
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[ first skip-empty-blocks 1vector ] change-successors
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instructions>> [ pop* ] [ [ ##branch new-insn ] dip push ] bi ;
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: delete-useless-conditionals ( cfg -- )
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[
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[
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dup delete-conditional? [ delete-conditional ] [ drop ] if
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] each-basic-block
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]
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[ cfg-changed ] [ predecessors-changed ] tri ;
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