PR for llvm/llvm-project#54033 #102
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Based on original tests from D119839. See llvm#53853
…nge comparison and branch until after at least the IPSCCP That transformation is lossy, as discussed in llvm#53853 and rust-lang/rust#85133 (comment) This is an alternative to D119839, which would add a limited IPSCCP into SimplifyCFG. Unlike lowering switch to lookup, we still want this transformation to happen relatively early, but after giving a chance for the things like CVP to do their thing. It seems like deferring it just until the IPSCCP is enough for the tests at hand, but perhaps we need to be more aggressive and disable it until CVP. Fixes llvm#53853 Refs. rust-lang/rust#85133 Reviewed By: nikic Differential Revision: https://reviews.llvm.org/D119854
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resolves llvm#54033