On Mon, May 20, 2019 at 01:31:10PM -0600, Jeff Law wrote: > On 5/15/19 10:44 AM, Segher Boessenkool wrote: > > But we can be allocated a floating point register, or memory, instead. > > That is heavily discouraged (by making it more expensive), but it can > > still happen. This is a jump_insn so it cannot get any reloads, either; > > but even if it could, that is an *expensive* thing to do. > RIght. ANd that's consistent with what other architectures have needed > to do. I can't describe the pain of what happens on the PA when you > find out that the loop counter got allocated to the shift amount > register or a floating point register. It's rare, but you had to handle > it. Ugh.
Maybe it's time to finally allow output reloads on jump insns. In LRA only, if that helps? Segher
