> These enhance patterns are generated in complicate combining situations.
Yes, that's clear. One strategy is to look through combine's output and see which combination results make sense for a particular backend. I was wondering where the unspec-less patterns originate (when we expand everything to predicated, unspec insns). > Splitters can not work in complicate case, you could try my testcase. > I am 100% it should be define_insn_and_split. I didn't mean to say that splitters should be used, just that I had similary "ugly" patterns with splitters and there will be more in the future. Regards Robin
