[all-commits] [llvm/llvm-project] 2a4645: [AArch64][GlobalISel] Optimize conjunctions of com...

[Amara Emerson via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 2a46450849de6904fc64f9a65303b20ca7fc9dbd
      https://github.com/llvm/llvm-project/commit/2a46450849de6904fc64f9a65303b20ca7fc9dbd
  Author: Amara Emerson <amara at apple.com>
  Date:   2022-02-20 (Sun, 20 Feb 2022)

  Changed paths:
    M llvm/include/llvm/CodeGen/GlobalISel/GenericMachineInstrs.h
    M llvm/lib/Target/AArch64/GISel/AArch64InstructionSelector.cpp
    M llvm/test/CodeGen/AArch64/arm64-ccmp.ll

  Log Message:
  -----------
  [AArch64][GlobalISel] Optimize conjunctions of compares to conditional compares.

This is a partial port of the same optimization from AArch64ISelLowering,
although the original handles more cases when generating regular compares
instead of this one which just does it when selecting G_SELECTs.

For more detailed comments see the original comments for
emitConditionalComparison() in AArch64ISelLowering.

Gives minor code size improvements.

Differential Revision: https://reviews.llvm.org/D117166