[all-commits] [llvm/llvm-project] c04fc5: [MemCpyOpt] allow some undef contents overread in ...

[Jameson Nash via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c04fc5596ec8c197c75b92a086c31438bfb08faf
      https://github.com/llvm/llvm-project/commit/c04fc5596ec8c197c75b92a086c31438bfb08faf
  Author: Jameson Nash <vtjnash at gmail.com>
  Date:   2025-06-18 (Wed, 18 Jun 2025)

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

  Log Message:
  -----------
  [MemCpyOpt] allow some undef contents overread in processMemCpyMemCpyDependence (#143745)

Allows memcpy to memcpy forwarding in cases where the second memcpy is
larger, but the overread is known to be undef, by shrinking the memcpy
size.

Refs https://github.com/llvm/llvm-project/pull/140954 which laid some of
the groundwork for this.



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