[all-commits] [llvm/llvm-project] 6c2581: [DSE] Look through memory PHI arguments when remov...

[Zoe Carver via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 6c25816d7b68e794a04ba0d7659178ab17252637
      https://github.com/llvm/llvm-project/commit/6c25816d7b68e794a04ba0d7659178ab17252637
  Author: zoecarver <z.zoelec2 at gmail.com>
  Date:   2020-10-01 (Thu, 01 Oct 2020)

  Changed paths:
    M llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp
    M llvm/test/Transforms/DeadStoreElimination/MSSA/noop-stores.ll
    R llvm/test/Transforms/DeadStoreElimination/MSSA/simple-todo.ll

  Log Message:
  -----------
  [DSE] Look through memory PHI arguments when removing noop stores in MSSA.

Summary:
Adds support for "following" memory through MSSA PHI arguments. This will help catch more noop stores that exist between blocks.

Originally part of D79391.

Reviewers: fhahn, jfb, asbirlea

Differential Revision: https://reviews.llvm.org/D82588