[all-commits] [llvm/llvm-project] bc7ea6: [MemCpyOpt] handle memcpy from memset for non-cons...

[Jameson Nash via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: bc7ea63e9c885fbe71dec29581a206bc0543d22a
      https://github.com/llvm/llvm-project/commit/bc7ea63e9c885fbe71dec29581a206bc0543d22a
  Author: Jameson Nash <vtjnash at gmail.com>
  Date:   2025-06-11 (Wed, 11 Jun 2025)

  Changed paths:
    M llvm/lib/Transforms/Scalar/MemCpyOptimizer.cpp
    M llvm/test/Transforms/MemCpyOpt/variable-sized-memset-memcpy.ll

  Log Message:
  -----------
  [MemCpyOpt] handle memcpy from memset for non-constant sizes (#143727)

Allows forwarding memset to memcpy for mismatching unknown sizes if
overread has undef contents. In that case we can refine the undef bytes
to the memset value.

Refs #140954 which laid some of the groundwork for this.



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