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Fix cleanup of conditionals with no live branches

db4
Slava Pestov 2008-08-29 04:40:53 -05:00
parent c9df16e931
commit 783d0fcabf
1 changed files with 10 additions and 4 deletions
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14
basis/compiler/tree/cleanup/cleanup.factor
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@ -102,8 +102,11 @@ M: #declare cleanup* drop f ;
: fold-only-branch ( #branch -- node/nodes )
#! If only one branch is live we don't need to branch at
#! all; just drop the condition value.
dup live-children sift dup length 1 =
[ first swap in-d>> #drop prefix ] [ drop ] if ;
dup live-children sift dup length {
{ 0 [ 2drop f ] }
{ 1 [ first swap in-d>> #drop prefix ] }
[ 2drop ]
} case ;
SYMBOL: live-branches
@ -118,15 +121,18 @@ M: #branch cleanup*
[ live-branches>> live-branches set ]
} cleave ;
: output-fs ( values -- nodes )
[ f swap #push ] map ;
: eliminate-single-phi ( #phi -- node )
[ phi-in-d>> first ] [ out-d>> ] bi over [ +bottom+ eq? ] all?
[ [ drop ] [ [ f swap #push ] map ] bi* ]
[ [ drop ] [ output-fs ] bi* ]
[ #copy ]
if ;
: eliminate-phi ( #phi -- node )
live-branches get sift length {
{ 0 [ drop f ] }
{ 0 [ out-d>> output-fs ] }
{ 1 [ eliminate-single-phi ] }
[ drop ]
} case ;