[all-commits] [llvm/llvm-project] daaea1: [Mem2Reg] Always allow single-store optimization f...

[Nikita Popov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: daaea128bb84f8ed7b9de36aa3a51f33b775c05a
      https://github.com/llvm/llvm-project/commit/daaea128bb84f8ed7b9de36aa3a51f33b775c05a
  Author: Nikita Popov <npopov at redhat.com>
  Date:   2024-07-05 (Fri, 05 Jul 2024)

  Changed paths:
    M llvm/lib/Transforms/Utils/PromoteMemoryToRegister.cpp

  Log Message:
  -----------
  [Mem2Reg] Always allow single-store optimization for dominating stores

In #97711 the single-store optimization was disabled for the case
where the value is potentially poison, as this may produce incorrect
results for loads of uninitialized memory.

However, this resulted in compile-time regressions. Address these
by still allowing the single-store optimization to occur in cases
where the store dominates the load, as we know that such a load
will always read initialized memory.



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