[all-commits] [llvm/llvm-project] 5ec184: [AArch64][GlobalISel] Add a new reassociation for ...

[Amara Emerson via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5ec1845cad9e2bce4eff78b6c7d7c0fca8dfffba
      https://github.com/llvm/llvm-project/commit/5ec1845cad9e2bce4eff78b6c7d7c0fca8dfffba
  Author: Amara Emerson <amara at apple.com>
  Date:   2021-09-14 (Tue, 14 Sep 2021)

  Changed paths:
    M llvm/include/llvm/CodeGen/GlobalISel/CombinerHelper.h
    M llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
    M llvm/test/CodeGen/AArch64/GlobalISel/combine-ptradd-reassociation.mir
    M llvm/test/CodeGen/AMDGPU/GlobalISel/mubuf-global.ll

  Log Message:
  -----------
  [AArch64][GlobalISel] Add a new reassociation for G_PTR_ADDs.

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%

Differential Revision: https://reviews.llvm.org/D109528