Hi, On Wed, May 23, 2018 at 08:35:49PM +0000, Joseph Myers wrote: > On Wed, 23 May 2018, Michael Meissner wrote: > > > One of the problems I've faced over the years is the assumption that there > > is > > only one type for a given size, and that isn't true for IF/KF/TFmode. > > I think that's a different problem. > > The problem here is that "wider" is only a partial ordering between > floating-point modes; neither IFmode nor KFmode is wider than the other. > (While TFmode has the same set of values as whichever of IFmode and KFmode > it corresponds to. And though IFmode is in some sense wider than DFmode, > it's probably not a good idea to treat it as such given that it doesn't > have the IEEE semantics of DFmode.)
Which semantics doesn't it have? (Other than the lack of non-default rounding modes, or is that what you meant?) Segher
