34 lines
1.1 KiB
Factor
34 lines
1.1 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: accessors assocs kernel locals fry sequences
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cpu.architecture
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compiler.cfg.rpo
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compiler.cfg.def-use
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compiler.cfg.utilities
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compiler.cfg.registers
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compiler.cfg.instructions ;
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IN: compiler.cfg.ssa.cssa
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! Convert SSA to conventional SSA. This pass runs after representation
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! selection, so it must keep track of representations when introducing
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! new values.
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: insert-copy? ( bb vreg -- ? )
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! If the last instruction defines a value (which means it is
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! ##fixnum-add, ##fixnum-sub or ##fixnum-mul) then we don't
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! need to insert a copy since in fact doing so will result
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! in incorrect code.
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[ instructions>> last defs-vreg ] dip eq? not ;
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:: insert-copy ( bb src rep -- bb dst )
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bb src insert-copy? [
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rep next-vreg-rep :> dst
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bb [ dst src rep ##copy ] add-instructions
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bb dst
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] [ bb src ] if ;
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: convert-phi ( ##phi -- )
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dup dst>> rep-of '[ [ _ insert-copy ] assoc-map ] change-inputs drop ;
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: construct-cssa ( cfg -- )
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[ [ convert-phi ] each-phi ] each-basic-block ; |