On Thu, Dec 31, 2020 at 9:40 AM Segher Boessenkool <seg...@kernel.crashing.org> wrote: > > Hi Uros, > > On Wed, Dec 30, 2020 at 05:44:50PM +0100, Uros Bizjak via Gcc-patches wrote: > > There is no need for combine splitters to emit insn patterns with clobbers, > > the pass is smart enough to add clobbers to patterns as necessary. > > Nice. Just one thing: in principle the splitters can be used outside of > combine, too? This can lead to insns that do not recog() then? Is > there anything that prevents that from happening?
No, combine splitters can't be used outside combine pass. These splitters only split non-recognizable (non-existing) instructions, and this is how they are told apart from general split insns. Also, most of these combine splitters were added recently, but for those I added, I was not aware of the clobber adding detail (which simplifies some patterns quite nicely). Uros.
