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On Aug 18, 2010, at 10:27 AM, Bob Wilson wrote: >> I tend to think that it isn't worth the compile time to try to microoptimize out every compare, but I could be convinced otherwise if there are important use cases we're failing to handle. I also do think that whole-function selection dags will solve a lot of grossness (e.g. much of codegen prepare) with a very clean model. >

On Aug 18, 2010, at 9:56 AM, Chris Lattner wrote: > On Aug 18, 2010, at 9:22 AM, Bob Wilson wrote: >> I'm looking at llvm-generated ARM code that has some unnecessary UXTB (zero extend) instructions, and it seems to me that doing type legalization as an entirely local transformation is not the best approach. > > That's true, but doing isel as a purely local approach