[all-commits] [llvm/llvm-project] b7fcf6: [GISel] Add new combines for G_ADD

[Michael Kitzan via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b7fcf6632fe30cdb89493b6c6b59cf1741a00dfc
      https://github.com/llvm/llvm-project/commit/b7fcf6632fe30cdb89493b6c6b59cf1741a00dfc
  Author: Michael Kitzan <mkitzan at apple.com>
  Date:   2022-06-06 (Mon, 06 Jun 2022)

  Changed paths:
    M llvm/include/llvm/CodeGen/GlobalISel/CombinerHelper.h
    M llvm/include/llvm/Target/GlobalISel/Combine.td
    M llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
    A llvm/test/CodeGen/AArch64/GlobalISel/combine-add.mir

  Log Message:
  -----------
  [GISel] Add new combines for G_ADD

Patch adds new GICombineRules for G_ADD:

G_ADD(x, G_SUB(y, x)) -> y
G_ADD(G_SUB(y, x), x) -> y

Patch additionally adds new combine tests for AArch64 target for
these new rules.

Reviewed by: paquette

Differential Revision: https://reviews.llvm.org/D87936