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Eli Friedman
ea67fb768b
This gets rid of a bunch of weird special cases; instead, just use SCEV rewriting for everything. In addition to being simpler, this fixes a bug where we would use the wrong stride in certain edge cases. The one bit I'm not quite sure about is the trip count handling, specifically the FIXME about overflow. In general, I think we need to widen the exit condition, but that's probably not profitable if the new type isn't legal, so we probably need a check somewhere. That said, I don't think I'm making the existing problem any worse. As a followup to this, a bunch of IV-related code in root-finding could be cleaned up; with SCEV-based rewriting, there isn't any reason to assume a loop will have exactly one or two PHI nodes. Differential Revision: https://reviews.llvm.org/D45191 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@335400 91177308-0d34-0410-b5e6-96231b3b80d8
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