[PATCH] D71696: [CodeGen] WIP MachinePostRAUpdater

[Sam Parker via Phabricator via llvm-commits]

samparker created this revision.
Herald added subscribers: hiraditya, kristof.beyls, mgorny.
Herald added a project: LLVM.

Introduce a new class that acts as a wrapper around ReachingDefAnalysis that can be used to track changes and still query use-def chains. It's primary purpose is to enable the insertion, removal and movement of machine instructions.

This replaces how we were using RDA in ARMLowOverheadLoops. The test changes are because the updater is capable of finding more redundant instructions.


https://reviews.llvm.org/D71696

Files:
  llvm/include/llvm/CodeGen/MachinePostRAUpdater.h
  llvm/include/llvm/CodeGen/ReachingDefAnalysis.h
  llvm/lib/CodeGen/CMakeLists.txt
  llvm/lib/CodeGen/MachinePostRAUpdater.cpp
  llvm/lib/CodeGen/ReachingDefAnalysis.cpp
  llvm/lib/Target/ARM/ARMLowOverheadLoops.cpp
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/dont-remove-loop-update2.mir
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/mve-tail-data-types.ll
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/wlstp.mir

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