<a...@codesourcery.com> writes: > GCN uses V64BImode to represent vector masks in the middle-end, and DImode > bit-masks to represent them in the back-end. These must be converted at > expand > time and the most convenient way is to simply use a SUBREG. > > This works fine except that simplify_subreg needs to be able to convert > immediates, mostly for REG_EQUAL and REG_EQUIV, and currently does not know > how > to convert vectors to integers where there is more than one element per byte. > > This patch implements such conversions for the cases that we need. > > I don't know why this is not a problem for other targets that use BImode > vectors, such as ARM SVE, so it's possible I missed some magic somewhere?
FWIW, SVE never converts predicates to integers: they stay as V..BImode. Richard
