[all-commits] [llvm/llvm-project] 3e3754: [MemCpyOpt] Move GEP during call slot optimization

[Nikita Popov via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 3e37543111f40c3fa2430a80eb0293ae3b814dd3
      https://github.com/llvm/llvm-project/commit/3e37543111f40c3fa2430a80eb0293ae3b814dd3
  Author: Nikita Popov <nikita.ppv at gmail.com>
  Date:   2020-10-22 (Thu, 22 Oct 2020)

  Changed paths:
    M llvm/lib/Transforms/Scalar/MemCpyOptimizer.cpp
    M llvm/test/Transforms/MemCpyOpt/callslot.ll

  Log Message:
  -----------
  [MemCpyOpt] Move GEP during call slot optimization

When performing a call slot optimization to a GEP destination, it
will currently usually fail, because the GEP is directly before the
memcpy and as such does not dominate the call. We should move it
above the call if that satisfies the domination requirement.

I think that a constant-index GEP is the only useful thing to move
here, as otherwise isDereferenceablePointer couldn't look through
it anyway. As such I'm not trying to generalize this further.

Differential Revision: https://reviews.llvm.org/D89623