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Fix intmap-intersect corner case

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* module/language/cps/intmap.scm (intmap-intersect): Fix a corner case,
  as was recently fixed for intsets.
This commit is contained in:
Andy Wingo 2014-06-29 19:49:41 +02:00
parent 072b5a277c
commit e21dae43fc
1 changed files with 23 additions and 15 deletions
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38
module/language/cps/intmap.scm
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@ -349,23 +349,31 @@
(else
(let* ((lo-shift (- lo-shift *branch-bits*))
(lo-idx (ash (- hi-min lo-min) (- lo-shift))))
(if (>= lo-idx *branch-size*)
;; HI has a lower shift, but it not within LO.
empty-intmap
(let ((lo (make-intmap (+ lo-min (ash lo-idx lo-shift))
lo-shift
(vector-ref lo-root lo-idx))))
(if lo-is-a?
(intmap-intersect lo hi meet)
(intmap-intersect hi lo meet))))))))
(cond
((>= lo-idx *branch-size*)
;; HI has a lower shift, but it not within LO.
empty-intmap)
((vector-ref lo-root lo-idx)
=> (lambda (lo-root)
(let ((lo (make-intmap (+ lo-min (ash lo-idx lo-shift))
lo-shift
lo-root)))
(if lo-is-a?
(intmap-intersect lo hi meet)
(intmap-intersect hi lo meet)))))
(else empty-intmap))))))
(define (different-shifts-same-min min hi-shift hi-root lo lo-is-a?)
(let ((hi (make-intmap min
(- hi-shift *branch-bits*)
(vector-ref hi-root 0))))
(if lo-is-a?
(intmap-intersect lo hi meet)
(intmap-intersect hi lo meet))))
(cond
((vector-ref hi-root 0)
=> (lambda (hi-root)
(let ((hi (make-intmap min
(- hi-shift *branch-bits*)
hi-root)))
(if lo-is-a?
(intmap-intersect lo hi meet)
(intmap-intersect hi lo meet)))))
(else empty-intmap)))
(match (cons a b)
((($ <intmap> a-min a-shift a-root) . ($ <intmap> b-min b-shift b-root))