height-changes ( #shuffle -- height-changes )
Final stage of compilation generates machine code from dataflow IR
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Vocabulary
compiler.cfg.builder

Inputs
#shufflea #shuffle


Outputs
height-changesa pair


Word description
Returns a two-tuple which represents how much the #shuffle node increases or decreases the data and retainstacks.

Examples
USING: compiler.cfg.builder compiler.tree prettyprint ; T{ #shuffle { in-d { 37 81 92 } } { out-d { 20 } } } height-changes .
{ -2 0 }


Definition
USING: accessors arrays combinators kernel math sequences ;

IN: compiler.cfg.builder

: height-changes ( #shuffle -- height-changes )
{ [ out-d>> ] [ in-d>> ] [ out-r>> ] [ in-r>> ] } cleave
4array [ length ] map first4 [ - ] 2bi@ 2array ;