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cs: repairs for old vector-based HAMT

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Sync the old implementation with some repairs for `equal?/recur` and
key replacement.
This commit is contained in:
Matthew Flatt 2020-09-29 08:38:35 -06:00
parent c4df79b38d
commit 58deff8b6f
1 changed files with 7 additions and 3 deletions
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10
racket/src/cs/rumble/hamt-vector.ss
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@ -394,7 +394,8 @@
[v (val-ref node ki)])
(cond
[(key=? node key k)
(if (eq? val v)
(if (and (eq? val v)
(eq? key k))
node
;; for consistency, we're required to keep the new key:
(bnode-replace-val node ki val key (not (eq? key k))))]
@ -480,6 +481,7 @@
(node=? ak bk eql? (down shift))]
[else
(and (key=? a ak bk)
(eql? ak bk) ; needed for `equal?/recur`
(eql? (val-ref a i) (val-ref b i)))])
(loop (fx1+ i))))])))))
@ -857,9 +859,11 @@
[(fx= i alen) #t]
[else
(let* ([akey (key-ref a i)]
[bval (cnode-ref b akey none2)])
[bi (cnode-index b akey)])
(and
(eql? (val-ref a i) bval)
bi
(eql? akey (key-ref b bi)) ; needed for `equal?/recur`
(eql? (val-ref a i) (val-ref b bi))
(loop (fx1+ i))))]))))))
(define (cnode-keys-subset? a b shift)