From: Bryan C. Warnock [mailto:[EMAIL PROTECTED]] > On Tue, 2003-01-28 at 17:12, Garrett Goebel wrote: > > > > There are 3 standard binary IEEE 754 derived formats: > > > > Single Precision: 4 bytes > > Double Precision: 8 bytes > > Quadruple Precision: 16 bytes > > Actually, Quads aren't standard. 'long doubles' and the ilk > are double extended, and require at least 10 bytes. (Which, > coincidentally, is the size of the x86 fp registers.)
I think what I read with regard to 754 is that they are defacto standard. And that they're slated for 754R. > In memory, they're padded to 12 or 16 bytes to preserve word > boundaries. Again, just aping back what I'm reading... http://www.validlab.com/754R/proposals/formats/formats.pdf It looks like double precision is a member of the single extended family and quad precision of the double extended family, but the terms are not interchangable. double extended require >= 79 bits, but quads specifically require 128 bits.
