[PATCH] D109528: [AArch64][GlobalISel] Add a new reassociation for G_PTR_ADDs.

[Amara Emerson via Phabricator via llvm-commits]

aemerson created this revision.
aemerson added reviewers: paquette, arsenm, foad.
aemerson added a project: LLVM.
Herald added subscribers: kerbowa, hiraditya, kristof.beyls, rovka, nhaehnle, jvesely.
aemerson requested review of this revision.
Herald added a subscriber: wdng.

G_PTR_ADD (G_PTR_ADD X, C), Y) -> (G_PTR_ADD (G_PTR_ADD(X, Y), C)

Improves CTMark -Os on AArch64:

  Program            before after  diff
             sqlite3 286932 287024  0.0%
                  kc 432512 432508 -0.0%
               SPASS 412788 412764 -0.0%
      pairlocalalign 249460 249416 -0.0%
              bullet 475740 475512 -0.0%
      7zip-benchmark 568864 568356 -0.1%
    consumer-typeset 419088 418648 -0.1%
          tramp3d-v4 367628 367224 -0.1%
            clamscan 383184 382732 -0.1%
              lencod 430028 429284 -0.2%
  Geomean difference               -0.1%


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D109528

Files:
  llvm/include/llvm/CodeGen/GlobalISel/CombinerHelper.h
  llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
  llvm/test/CodeGen/AArch64/GlobalISel/combine-ptradd-reassociation.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/hip.extern.shared.array.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/mubuf-global.ll

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