On June 5, 2018 6:50:22 PM GMT+02:00, Segher Boessenkool <seg...@kernel.crashing.org> wrote: >On Fri, Jun 01, 2018 at 04:36:54PM -0400, Michael Meissner wrote: >> As I mentioned previously, the initialization process needs to go >through all >> of the widening tables in order to initialize all FP types, so we >can't just >> arbitrarily eliminate IFmode from the widening table. > >Or change the initialisation process. There is no wider mode for >IFmode, >and IFmode can not be used as a wider mode for any other mode. > >> I could imagine having an alternative *_FLOAT_MODE that essentially >marks which >> modes shouldn't be widened to/from and binop/unop could use. Or I >could >> imagine making two widening tables, one for initialization, and one >for >> binop/unop, or other possibilities. > >For integer types there are the partial int types, maybe we want >something >similar for float?
Are there other targets with similar kind of (FP) modes or is ppc the only one with this 'legacy'? Also keep in mind that you intended to backport this... Why not simply make IBM and IEEE double mutually exclusive inside a TU? Richard. > >Segher
