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Forum: Operation Billion Digits 2005-11-09, 14:25
Replies: 27
Views: 20,904
Posted By fatphil
Too late :-) Last night I came up with 3...

Too late :-)

Last night I came up with 3 slightly different routines, including one looking identical to yours, each of which could possibly be fastest depending on quantity of unrolling and...
Forum: Operation Billion Digits 2005-11-08, 14:41
Replies: 27
Views: 20,904
Posted By fatphil
This is MADD! I love it. It changes _everything_!...

This is MADD! I love it. It changes _everything_!
(OK, everything that was on my next 2 or 3 weeks' to-do list.)

I better ask - does it guarantee <0.5 ulp?

Phil
Forum: Operation Billion Digits 2005-11-08, 10:36
Replies: 27
Views: 20,904
Posted By fatphil
D'oh! 3*2^50 works, you're right. My mistake. I...

D'oh! 3*2^50 works, you're right. My mistake. I was getting confused by the more general case of non-power-of-2 radices. (the kinds of bignums I normally deal with, where the carries need to be...
Forum: Operation Billion Digits 2005-11-08, 09:50
Replies: 27
Views: 20,904
Posted By fatphil
Call me old-fashioned, but I like fingers at the...

Call me old-fashioned, but I like fingers at the ends of my limbs!
For limbs a,b,c, it's nice to be able to exactly represent (2*a*c+b^2) without exceeding the precision of the FPU.



FP is...
Forum: Operation Billion Digits 2005-11-07, 08:20
Replies: 27
Views: 20,904
Posted By fatphil
I pulled up 'shark' for the first time yesterday,...

I pulled up 'shark' for the first time yesterday, and it seems quite informative. I have no idea if it can be used over an SSH session, as it seems gooey only. Perhaps Mark can enlighten us.
I think...
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