55 lines
1.2 KiB
Factor
55 lines
1.2 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: kernel namespaces assocs accessors sequences
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compiler.cfg.rpo compiler.cfg.renaming compiler.cfg.instructions ;
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IN: compiler.cfg.copy-prop
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! The first three definitions are also used in compiler.cfg.alias-analysis.
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SYMBOL: copies
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: resolve ( vreg -- vreg )
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[ copies get at ] keep or ;
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: record-copy ( ##copy -- )
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[ src>> resolve ] [ dst>> ] bi copies get set-at ; inline
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<PRIVATE
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GENERIC: visit-insn ( insn -- )
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M: ##copy visit-insn record-copy ;
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M: ##phi visit-insn inputs>> values [ resolve ] map all-equal? [ "BLAH!" print ] when ;
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M: insn visit-insn drop ;
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: collect-copies ( cfg -- )
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H{ } clone copies set
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[
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instructions>>
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[ visit-insn ] each
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] each-basic-block ;
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GENERIC: update-insn ( insn -- keep? )
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M: ##copy update-insn drop f ;
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M: insn update-insn rename-insn-uses t ;
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: rename-copies ( cfg -- )
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copies get dup assoc-empty? [ 2drop ] [
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renamings set
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[
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instructions>>
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[ update-insn ] filter-here
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] each-basic-block
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] if ;
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PRIVATE>
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: copy-propagation ( cfg -- cfg' )
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[ collect-copies ]
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[ rename-copies ]
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[ ]
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tri ;
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