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Add bitvector->intset.

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* module/language/cps/intset.scm (bitvector->intset): New interface.
This commit is contained in:
Andy Wingo 2014-07-03 10:37:20 +02:00
parent 4296c36ec8
commit 7f6aafa5ae
1 changed files with 19 additions and 1 deletions
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20
module/language/cps/intset.scm
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@ -36,7 +36,8 @@
intset-next
intset-union
intset-intersect
intset-subtract))
intset-subtract
bitvector->intset))
(define-syntax-rule (define-inline name val)
(define-syntax name (identifier-syntax val)))
@ -536,3 +537,20 @@
(if (eq? old new)
a-root
(clone-branch-and-set a-root a-idx new)))))))))))
(define (bitvector->intset bv)
(define (finish-tail out min tail)
(if (zero? tail)
out
(intset-union out (make-intset min *leaf-bits* tail))))
(let lp ((out empty-intset) (min 0) (pos 0) (tail 0))
(let ((pos (bit-position #t bv pos)))
(cond
((not pos)
(finish-tail out min tail))
((< pos (+ min *leaf-size*))
(lp out min (1+ pos) (logior tail (ash 1 (- pos min)))))
(else
(let ((min* (round-down pos *leaf-bits*)))
(lp (finish-tail out min tail)
min* pos (ash 1 (- pos min*)))))))))