52 lines
1.5 KiB
Factor
52 lines
1.5 KiB
Factor
! Copyright (C) 2008 Slava Pestov.
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! See http://factorcode.org/license.txt for BSD license.
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USING: accessors math namespaces sequences kernel fry
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compiler.cfg compiler.cfg.registers compiler.cfg.instructions ;
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IN: compiler.cfg.height
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! Combine multiple stack height changes into one at the
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! start of the basic block.
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SYMBOL: ds-height
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SYMBOL: rs-height
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GENERIC: compute-heights ( insn -- )
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M: ##inc-d compute-heights n>> ds-height [ + ] change ;
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M: ##inc-r compute-heights n>> rs-height [ + ] change ;
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M: insn compute-heights drop ;
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GENERIC: normalize-height* ( insn -- insn' )
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: normalize-inc-d/r ( insn stack -- insn' )
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swap n>> '[ _ - ] change f ; inline
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M: ##inc-d normalize-height* ds-height normalize-inc-d/r ;
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M: ##inc-r normalize-height* rs-height normalize-inc-d/r ;
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GENERIC: loc-stack ( loc -- stack )
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M: ds-loc loc-stack drop ds-height ;
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M: rs-loc loc-stack drop rs-height ;
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GENERIC: <loc> ( n stack -- loc )
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M: ds-loc <loc> drop <ds-loc> ;
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M: rs-loc <loc> drop <rs-loc> ;
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: normalize-peek/replace ( insn -- insn' )
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[ [ [ n>> ] [ loc-stack get ] bi + ] keep <loc> ] change-loc ; inline
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M: ##peek normalize-height* normalize-peek/replace ;
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M: ##replace normalize-height* normalize-peek/replace ;
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M: insn normalize-height* ;
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: normalize-height ( insns -- insns' )
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0 ds-height set
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0 rs-height set
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[ [ compute-heights ] each ]
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[ [ [ normalize-height* ] map sift ] with-scope ] bi
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ds-height get dup zero? [ drop ] [ f \ ##inc-d boa prefix ] if
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rs-height get dup zero? [ drop ] [ f \ ##inc-r boa prefix ] if ;
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