[PATCH] D82407: [DSE,MSSA] Remove dead stores to stack-allocated locations

[Whitney Tsang via Phabricator via llvm-commits]

Whitney created this revision.
Whitney added reviewers: fhahn, chrisjackson, bkramer, serge-sans-paille, zoecarver, eli.friedman, etiotto, bmahjour.
Whitney added a project: LLVM.
Herald added subscribers: llvm-commits, hiraditya, Prazek.

This patch adds the support to remove dead stores to stack-allocated locations when `-enable-dse-memoryssa=true`.
For example:

  %A = alloca i32
  ...
  store i32 1, i32* %A
  ret void

Note that dead stores to stack-allocated locations in end blocks can already be removed when `-enable-dse-memoryssa=false`.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D82407

Files:
  llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp
  llvm/test/Transforms/DeadStoreElimination/MSSA/mda-with-dbg-values.ll
  llvm/test/Transforms/DeadStoreElimination/MSSA/multiblock-captures.ll
  llvm/test/Transforms/DeadStoreElimination/MSSA/multiblock-exceptions.ll
  llvm/test/Transforms/DeadStoreElimination/MSSA/multiblock-memintrinsics.ll
  llvm/test/Transforms/DeadStoreElimination/MSSA/multiblock-multipath.ll
  llvm/test/Transforms/DeadStoreElimination/MSSA/multiblock-simple.ll
  llvm/test/Transforms/DeadStoreElimination/MSSA/simple.ll

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