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Fix inference of generic < on NaN values

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* module/language/cps/types.scm (<): Don't infer anything if either
  number could be a flonum.
This commit is contained in:
Andy Wingo 2017-11-22 10:44:34 +01:00
parent 6f3ae92b37
commit e79de9d4b5
1 changed files with 7 additions and 5 deletions
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12
module/language/cps/types.scm
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@ -1051,16 +1051,18 @@ minimum, and maximum."
(restrict! b &bignum -inf.0 (1- (target-most-negative-fixnum)))))
(else
(infer-integer-< a b true?))))
(else
;; Can't include &flonum because of NaN. Perhaps we should model
;; NaN with a separate type bit.
((type<=? types &exact-number)
(let ((min0 (&min a)) (max0 (&max a))
(min1 (&min b)) (max1 (&max b)))
(cond
(true?
(restrict! a &real min0 (min max0 max1))
(restrict! b &real (max min0 min1) max1))
(restrict! a &exact-number min0 (min max0 max1))
(restrict! b &exact-number (max min0 min1) max1))
(else
(restrict! a &real (max min0 min1) max0)
(restrict! b &real min1 (min max0 max1)))))))))
(restrict! a &exact-number (max min0 min1) max0)
(restrict! b &exact-number min1 (min max0 max1)))))))))
(define-=-inferrer (u64-= &u64))
(define-predicate-inferrer (u64-< a b true?)