On Thu, Sep 10, 2020 at 5:12 PM Segher Boessenkool <seg...@kernel.crashing.org> wrote: > > Hi! > > On Thu, Sep 10, 2020 at 04:33:30PM +0200, Richard Biener wrote: > > On Thu, Sep 10, 2020 at 4:22 PM Aaron Sawdey <acsaw...@linux.ibm.com> wrote: > > > If it feels like a hack, that would because it is a hack. > > > > > > What I’d really like to discuss is how to accomplish the real goal: keep > > > anything from trying to do other operations (zero/sign extend for one) to > > > POImode. > > > > > > Is there an existing mechanism for this? > > > > Not that I know, but somehow x86 gets away with OImode and XImode without > > providing too many patterns for those. > > What we were seeing is DSE (of all things!) tries to extract a DImode > from a POImode (and expects that insn to exist!) That is no good.
Maybe. I don't know what kind of operations have to exist if a mode is present and what not. But are you sure this will be the only case you'll run into? Richard. > > Segher
