pre-commit (diff): llvm/llvm-project/compare/main...fhahn:scev-howmanlessthans-no-overflow-2 - #1195
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pre-commit (diff): llvm/llvm-project/compare/main...fhahn:scev-howmanlessthans-no-overflow-2#1195zyw-bot wants to merge 3 commits into
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Follow-up to Re-use AddingStrideMinusOneMayOverflow (was MayAddOverflow) when Start - Stride < RHS. This is a generalization of using !IVMayOverflow (was added in llvm#218694). This handles 2 additional cases when Start < RHS: * Stride is known power-of-2: * Start == Stride and Start == Stride -1. This moves up the existing MayAddOverflow with comments, and clarifies the name to AddingStrideMinusOneMayOverflow. This improves trip count computations in a number of real-world cases: dtcxzyw/llvm-opt-benchmark-nightly#1195. End-to-end Alive2 Proofs for both cases in unsigned: https://alive2.llvm.org/ce/z/MQ2YLf
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cc @fhahn
Current: llvm/llvm-project@main...fhahn:scev-howmanlessthans-no-overflow-2
Baseline commit: llvm/llvm-project@230ba12
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