Re: LONG, LONG math - aka 64bit math....

[Don <dr2@xxxxxxxxxxxx>]

Agreed that this is the MI list and the concern arose from a crypto
routine written in C and ported to the 400...but the question still stands
and also, it would be interesting as to how far down this implementation
actually went in the MI vs simulating 64 bit math with 32bit op codes..:)

Thanks Leif....


DOn




On Wed, 4 Jul 2001, Leif Svalgaard wrote:

> From: Don <dr2@cssas400.com>
> > Dumb question:
> > 
> > I told that in effect we didn't have 64bit math ops on this machine until
> > v4r5/v5r1.  This is to say that "long long" variables didn't exist until
> > they finally wokeup and got serious about terabyte space and gave us 64bit
> > math....   
> > 
> > Can anyone confirm this for me?
> 
> dumb answer:
> MI only had BIN(2) and BIN(4) (i.e. 16-bit and 32-bit) binary variables
> at least through v4r5; don't know about v5R1, but I doubt it.
> Packed and zoned variables go to 31 digits (much beyond 64-bit).
> Float has always had FLT(4) (32-bit) and FLT(8) (64-bit), but
> since floats are IEEE standard, that's no news.
> Other languages may vary.
> But this is the MI list, right?
> 
> 
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