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Fix type of n-ary * to handle NaN properly.

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Vincent St-Amour 2012-06-06 18:05:47 -04:00
parent c0b978f71f
commit 0f346601f4
1 changed files with 10 additions and 8 deletions
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18
collects/typed-racket/base-env/base-env-numeric.rkt
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@ -988,49 +988,51 @@
(-> -NegRat -NegRat -NegRat -NegRat)
(-> -NonPosRat -NonPosRat -NonPosRat -NonPosRat)
(map varop (list -Rat -FlonumZero))
(varop-1+ -PosFlonum -NonNegFlonum) ; possible underflow
; no pos * -> pos, possible underflow
; no pos * -> non-neg, possible NaN: (* small small +inf.0)
(-> -PosFlonum -PosFlonum -NonNegFlonum)
(-> -NonNegFlonum -NonNegFlonum)
(varop-1+ (Un -NonNegFlonum -FlonumNan)) ; (* +inf.0 0.0) -> +nan.o
(-> -NegFlonum -NegFlonum)
(-> -NonPosFlonum -NonPosFlonum)
;; can't do NonPos NonPos -> NonNeg: (* -1.0 0.0) -> NonPos!
(-> -NegFlonum -NegFlonum -NonNegFlonum) ; possible underflow, so no neg neg -> pos
(-> -NegFlonum -NegFlonum -NegFlonum -NonPosFlonum)
(-> -NegFlonum -NegFlonum -NegFlonum (Un -NonPosFlonum -FlonumNan)) ; see above
;; limited flonum contagion rules
;; (* <float> 0) is exact 0 (i.e. not a float)
(commutative-case -NonNegFlonum -PosReal (Un -NonNegFlonum -FlonumNan)) ; real args don't include 0
(commutative-case -Flonum (Un -PosReal -NegReal) -Flonum)
(map varop (list -Flonum -SingleFlonumZero))
(varop-1+ -PosSingleFlonum -NonNegSingleFlonum)
(-> -PosSingleFlonum -PosSingleFlonum -NonNegSingleFlonum)
(-> -NonNegSingleFlonum -NonNegSingleFlonum)
(varop-1+ (Un -NonNegSingleFlonum -FlonumNan))
;; we could add contagion rules for negatives, but we haven't for now
(-> -NegSingleFlonum -NegSingleFlonum)
(-> -NonPosSingleFlonum -NonPosSingleFlonum)
(-> -NegSingleFlonum -NegSingleFlonum -NonNegSingleFlonum) ; possible underflow, so no neg neg -> pos
(-> -NegSingleFlonum -NegSingleFlonum -NegSingleFlonum -NonPosSingleFlonum)
(-> -NegSingleFlonum -NegSingleFlonum -NegSingleFlonum (Un -NonPosSingleFlonum -SingleFlonumNan))
(commutative-case -NonNegSingleFlonum (Un -PosRat -NonNegSingleFlonum) (Un -NonNegSingleFlonum -SingleFlonumNan))
(commutative-case -SingleFlonum (Un -PosRat -NegRat -SingleFlonum) -SingleFlonum)
(map varop (list -SingleFlonum -InexactRealZero))
(varop-1+ -PosInexactReal -NonNegInexactReal)
(-> -PosInexactReal -PosInexactReal -NonNegInexactReal)
(-> -NonNegInexactReal -NonNegInexactReal)
(varop-1+ (Un -NonNegInexactReal -InexactRealNan))
(-> -NegInexactReal -NegInexactReal)
(-> -NonPosInexactReal -NonPosInexactReal)
(-> -NegInexactReal -NegInexactReal -NonNegInexactReal)
(-> -NegInexactReal -NegInexactReal -NegInexactReal -NonPosInexactReal)
(-> -NegInexactReal -NegInexactReal -NegInexactReal (Un -NonPosInexactReal -InexactRealNan))
(commutative-case -NonNegInexactReal (Un -PosRat -NonNegInexactReal) (Un -NonNegInexactReal -SingleFlonumNan))
(commutative-case -InexactReal (Un -PosRat -NegRat -InexactReal) -InexactReal)
(varop -InexactReal)
;; reals
(varop-1+ -PosReal -NonNegReal)
(-> -PosReal -PosReal -NonNegReal)
(-> -NonNegReal -NonNegReal)
(varop-1+ (Un -NonNegReal -InexactRealNan)) ; (* +inf.0 0.0) -> +nan.0
(-> -NegReal -NegReal)
(-> -NonPosReal -NonPosReal)
(-> -NegReal -NegReal -NonNegReal)
(commutative-binop -NegReal -PosReal -NonPosReal)
(-> -NegReal -NegReal -NegReal -NonPosReal)
(-> -NegReal -NegReal -NegReal (Un -NonPosReal -InexactRealNan))
(varop -Real)
;; complexes
(commutative-case -FloatComplex (Un -InexactComplex -InexactReal -PosRat -NegRat) -FloatComplex)