[all-commits] [llvm/llvm-project] 4125af: [MemCpyOpt] Fix handling of readnone byval arguments

[Nikita Popov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4125afc35723b490556f7a38f7835f0914f70292
      https://github.com/llvm/llvm-project/commit/4125afc35723b490556f7a38f7835f0914f70292
  Author: Nikita Popov <nikita.ppv at gmail.com>
  Date:   2021-02-22 (Mon, 22 Feb 2021)

  Changed paths:
    M llvm/lib/Transforms/Scalar/MemCpyOptimizer.cpp
    A llvm/test/Transforms/MemCpyOpt/byval-readnone.ll

  Log Message:
  -----------
  [MemCpyOpt] Fix handling of readnone byval arguments

If the call is readnone, then there may not be any MemoryAccess
associated with the call. Bail out in that case.

This fixes the issue reported at
https://reviews.llvm.org/D94376#2578312.