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This fold and several others were added in: rL125734 ...with no explanation for the one-use checks other than the code comments about register pressure. Given that this is IR canonicalization, we shouldn't be worried about register pressure though; the backend should be able to adjust for that as needed. There are similar checks as noted with the TODO comments. I'm hoping to remove those restrictions too, but if any of these does cause a regression, it should be easier to correct by making small, individual commits. This is part of solving PR43310 the theoretically right way: https://bugs.llvm.org/show_bug.cgi?id=43310 ...ie, if we don't cripple basic transforms, then we won't need to add special-case code to detect larger patterns. llvm-svn: 371940
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