Hi! On Wed, Aug 11, 2021 at 12:29:06PM +0100, Iain Sandoe wrote: > > On 11 Aug 2021, at 11:55, Segher Boessenkool <seg...@kernel.crashing.org> > > wrote: > > On Tue, Aug 10, 2021 at 04:46:11PM -0600, Sandra Loosemore wrote: > >> OK. I used your wording verbatim for the first one. For the second > >> one, I'm still pretty confused as I think it is at least theoretically > >> possible on PowerPC to have a target with 64-bit long double (AIX?) that > > > > Some embedded and embedded-like subtargets use 64-bit long double by > > default. You can also configure this on any Power target (not that it > > will necessarily work ;-) ) > > > > I don't know if any subtarget with default 64-bit long double supports > > Fortran. > > I realize that this is not directly relevant to unscrambling the PPC 128bit > stuff, > but aarch64-apple-darwin2x has only 64b long double and supports gfortran. > (on both the new M1 desktop macOS and embedded iOS)
Yes, but aarch64-apple-darwin2x is not an rs6000 subtarget :-) There certainly are many targets with a 64b long double. > - it is not clear to me yet if there will at some point be a transition to a > 128b > long double for at least the desktop version. Yeah. I recommend any new target (or target for which this is new) to use an IEEE QP float as long double, even if just as soft float -- the advantages are just too great. > So the permutation definitely exists for at least one non-legacy, non-embedded > platform (and gfortran is very much in demand from the new M1 users). M1 is not embedded? :-) Segher
