[all-commits] [llvm/llvm-project] a4635e: [ConstraintElim] Support `add nsw` for unsigned pr...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a4635ec7108c57adc248d203a39e809918a9d028
      https://github.com/llvm/llvm-project/commit/a4635ec7108c57adc248d203a39e809918a9d028
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2022-10-16 (Sun, 16 Oct 2022)

  Changed paths:
    M llvm/lib/Transforms/Scalar/ConstraintElimination.cpp
    M llvm/test/Transforms/ConstraintElimination/add-nsw.ll

  Log Message:
  -----------
  [ConstraintElim] Support `add nsw` for unsigned preds with positive ops.

If both operands of an `add nsw` are known positive, it can be treated
the same as `add nuw` and added to the unsigned system.

https://alive2.llvm.org/ce/z/6gprff