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compiler.cfg.alias-analysis: fix bug in lazy alias class instantiation

db4
Slava Pestov 2010-09-26 21:16:50 -07:00 committed by Slava Pestov
parent e48c28359e
commit 53aed0805a
1 changed files with 4 additions and 3 deletions
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7
basis/compiler/cfg/alias-analysis/alias-analysis.factor
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@ -14,7 +14,8 @@ compiler.cfg.representations.preferred ;
FROM: namespaces => set ;
IN: compiler.cfg.alias-analysis
! We try to eliminate redundant slot operations using some simple heuristics.
! We try to eliminate redundant slot operations using some
! simple heuristics.
!
! All heap-allocated objects which are loaded from the stack, or
! other object slots are pessimistically assumed to belong to
@ -108,7 +109,7 @@ SYMBOL: heap-ac
2dup eq? [ 2drop ] [
[ ac>vregs ] dip
[ vregs>acs get '[ [ _ ] dip _ set-at ] each ]
[ acs>vregs get at push-all ]
[ ac>vregs push-all ]
2bi
] if ;
@ -129,7 +130,7 @@ ERROR: vreg-not-new vreg ;
#! Set alias class of newly-seen vreg.
vreg vregs>acs get key? [ vreg vreg-not-new ] when
ac vreg vregs>acs get set-at
vreg ac acs>vregs get push-at ;
vreg ac ac>vregs push ;
: live-slot ( slot#/f vreg -- vreg' )
#! If the slot number is unknown, we never reuse a previous