On Mon, Nov 30, 2020 at 11:08:22AM +0800, HAO CHEN GUI wrote: > This patch adds a new pattern(combine 4 insns to 3 insns) in 4-insn > combine. In the patch, newpat is split twice. The newpat, newi2pat and
As I said before, that has a lot of problems, and is only suitable for stage 1 (after many fixes!) I don't think this is a good idea at all, fwiw. Before we even should think about doing 4->3 combinations, we should stop severely limiting what combinations of 4 insns we allow; and we do that because it will slow down the compiler a lot, for no big gain. Segher
