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Implement add:fl and add:rd.

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Jared Hance 2014-06-02 11:51:08 -04:00
parent 652db79338
commit 2e1a4c0f2e
1 changed files with 20 additions and 10 deletions
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30
arvo/hoon.hoon
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@ -1190,7 +1190,7 @@
++ bey |= [a=@ p=@ b=@ c=@]
?: =(b p)
c
$(c (^mul c a), b (add b 1))
$(c (^mul c a), b (^add b 1))
:: convert from sign/whole/frac -> sign/exp/ari w/ precision p
++ cof |= [p=@ s=? h=@ f=@] ^- [s=? e=@ a=@]
@ -1212,25 +1212,25 @@
++ dcl |= [f=@]
?: =(f 0)
0
(add 1 $(f (div f 10)))
(^add 1 $(f (div f 10)))
:: reverse ari, ari -> mantissa
++ ira |= a=@ ^- @
(mix (lsh 0 (dec (met 0 a)) 1) a)
:: limit ari to precision p
:: limit ari to precision p. Rounds if over, lsh if under.
++ lia |= [p=@ a=@] ^- @
?: (lte (met 0 a) (add p 1))
(lsh 0 (sub (add p 1) (met 0 a)) a)
?: (lte (met 0 a) (^add p 1))
(lsh 0 (sub (^add p 1) (met 0 a)) a)
(rnd p a)
:: round to nearest or even based on r (which has length n)
:: n should be the actual length of r, as it exists within a
:: The result is either (rhs 0 n a) or +(rsh 0 n a)
++ rnd |= [p=@ a=@]
?: (lte (met 0 a) (add p 1))
?: (lte (met 0 a) (^add p 1))
a :: avoid overflow
=+ n=(sub (met 0 a) (add p 1))
=+ n=(sub (met 0 a) (^add p 1))
=+ r=(end 0 n a)
(rne p a r n)
@ -1248,14 +1248,23 @@
+(b) :: starts with 1, not even distance
::::::::::::
++ add |= [p=@ n=[s=? e=@ a=@] m=[s=? e=@ a=@]] ^- [s=? e=@ a=@]
?. (gte e.n e.m)
$(n m, m n)
=+ dif=(sub e.n e.m)
=+ a2=(rsh 0 dif a.m) :: p-dif bits
=+ a3=(^add a.n a2) :: at least p bits
=+ dif2=(sub (met 0 a2) p) :: amount to adjust exp
[s=|(s.n s.m) e=(^add dif2 e.n) a=(rnd p a3)]
++ mul |= [p=@ n=[s=? e=@ a=@] m=[s=? e=@ a=@]] ^- [s=? e=@ a=@]
=+ a2=(^mul a.n a.m)
:: =+ a3=(mix (lsh 0 (^mul p 2) 1) (end 0 (^mul p 2) a2))
=+ e2=(met 0 (rsh 0 (add 1 (^mul p 2)) a2))
=+ e2=(met 0 (rsh 0 (^add 1 (^mul p 2)) a2))
:: =+ a4=(rnd p (rsh 0 e2 a3))
=+ a4=(rnd p (rsh 0 e2 a2))
=+ s2=|(s.n s.m)
[s=s2 e=:(add e.n e.m e2) a=a4]
[s=s2 e=:(^add e.n e.m e2) a=a4]
--
:: Real interface for @rd
@ -1283,7 +1292,8 @@
::::::::::::
++ add |= [a=@rd b=@rd] ^- @rd
!!
(bit (add:fl 52 (sea a) (sea b)))
++ mul ~/ %mul
|= [a=@rd b=@rd] ^- @rd
(bit (mul:fl 52 (sea a) (sea b)))