[all-commits] [llvm/llvm-project] 4baf29: [DAG] Handle cases where a shift amount is larger ...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4baf29e81e30e6ebc1da56b9e5c338014961acf9
      https://github.com/llvm/llvm-project/commit/4baf29e81e30e6ebc1da56b9e5c338014961acf9
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2024-08-27 (Tue, 27 Aug 2024)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
    A llvm/test/CodeGen/SystemZ/pr106202.ll

  Log Message:
  -----------
  [DAG] Handle cases where a shift amount is larger than the pre-extended value bitwidth

In the (zext (shl (zext x), cst)) -> (shl (zext x), cst) fold, don't use a bitmask / MaskedValueIsZero as we can't guarantee that the shift amount is in bounds.

Fixes #106202



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