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Related folds were added in: rL125734 ...the code comment about register pressure is discussed in more detail in: https://bugs.llvm.org/show_bug.cgi?id=2698 But 10 years later, perf testing bzip2 with this change now shows a slight (0.2% average) improvement on Haswell although that's probably within test noise. 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. 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. rL371940 and rL371981 are related patches in this series. llvm-svn: 372007
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