[all-commits] [llvm/llvm-project] fc47fa: [MLIR][Mem2Reg] Improve performance by avoiding re...

[Christian Ulmann via All-commits]

  Branch: refs/heads/users/dinistro/change-memory-slot-interface-to-builders
  Home:   https://github.com/llvm/llvm-project
  Commit: fc47fa926fc8b9f55ea5635e3b94afadf4767002
      https://github.com/llvm/llvm-project/commit/fc47fa926fc8b9f55ea5635e3b94afadf4767002
  Author: Christian Ulmann <christian.ulmann at nextsilicon.com>
  Date:   2024-05-08 (Wed, 08 May 2024)

  Changed paths:
    M mlir/include/mlir/Transforms/Mem2Reg.h
    M mlir/lib/Transforms/Mem2Reg.cpp

  Log Message:
  -----------
  [MLIR][Mem2Reg] Improve performance by avoiding recomputations

This commit ensures that Mem2Reg reuses the `DominanceInfo` as well as
block index maps to avoid expensive recomputations. Due to the recent
migration to `OpBuilder`, the promotion of a slot does no longer replace
blocks. Having stable blocks makes the `DominanceInfo` preservable and
additionally allows to cache block index maps between different
promotions.

Performance measurements on very large functions show an up to 4x
speedup by these changes.



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