[all-commits] [llvm/llvm-project] 1344b6: [SCEV] Fix incorrect NUW inference (#70521)

[Daniil Suchkov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 1344b65c90507e2368a3d0678df9f179e8890665
      https://github.com/llvm/llvm-project/commit/1344b65c90507e2368a3d0678df9f179e8890665
  Author: Daniil Suchkov <suc-daniil at yandex.ru>
  Date:   2023-10-31 (Tue, 31 Oct 2023)

  Changed paths:
    M llvm/lib/Analysis/ScalarEvolution.cpp
    M llvm/test/Transforms/LoopStrengthReduce/scev-incorrect-nuw-inference.ll

  Log Message:
  -----------
  [SCEV] Fix incorrect NUW inference (#70521)

This patch fixes a miscompile in LSR caused by incorrect inference of
NUW flag for AddRec: we shouldn't infer no-wrap flags based on a
comparison which doesn't fully control the loop exit.