[all-commits] [llvm/llvm-project] 831ab3: [ARM][AArch64] generate subtarget feature flags

[tmatheson-arm via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 831ab35b2fc7ce2815a96e866b89ec4a0b8c2829
      https://github.com/llvm/llvm-project/commit/831ab35b2fc7ce2815a96e866b89ec4a0b8c2829
  Author: Tomas Matheson <tomas.matheson at arm.com>
  Date:   2022-03-18 (Fri, 18 Mar 2022)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64.td
    M llvm/lib/Target/AArch64/AArch64Subtarget.h
    M llvm/lib/Target/ARM/ARM.td
    M llvm/lib/Target/ARM/ARMISelLowering.cpp
    M llvm/lib/Target/ARM/ARMSubtarget.cpp
    M llvm/lib/Target/ARM/ARMSubtarget.h
    M llvm/utils/TableGen/SubtargetEmitter.cpp

  Log Message:
  -----------
  [ARM][AArch64] generate subtarget feature flags

Reland of D120906 after sanitizer failures.

This patch aims to reduce a lot of the boilerplate around adding new subtarget
features. From the SubtargetFeatures tablegen definitions, a series of calls to
the macro GET_SUBTARGETINFO_MACRO are generated in
ARM/AArch64GenSubtargetInfo.inc.  ARMSubtarget/AArch64Subtarget can then use
this macro to define bool members and the corresponding getter methods.

Some naming inconsistencies have been fixed to allow this, and one unused
member removed.

This implementation only applies to boolean members; in future both BitVector
and enum members could also be generated.

Differential Revision: https://reviews.llvm.org/D120906