[all-commits] [llvm/llvm-project] f00941: [DSE] Support opaque pointers

[Nikita Popov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f00941e061f39646b05fcab93f892fc793845da1
      https://github.com/llvm/llvm-project/commit/f00941e061f39646b05fcab93f892fc793845da1
  Author: Nikita Popov <nikita.ppv at gmail.com>
  Date:   2021-06-27 (Sun, 27 Jun 2021)

  Changed paths:
    M llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp
    M llvm/test/Transforms/DeadStoreElimination/OverwriteStoreBegin.ll

  Log Message:
  -----------
  [DSE] Support opaque pointers

For the start shortening optimization, always use a i8 type for
the GEP, as it is a raw offset calculation.

Handling of non-i8* memset/memcpy arguments requires insertion
of casts. These cases were previously miscompiled, as the offset
calculation was performed on the wrong type.