[all-commits] [llvm/llvm-project] 3351e1: [AArch64] Enable AvoidLDAPUR for cpu=generic betwe...

[David Green via All-commits]

  Branch: refs/heads/release/20.x
  Home:   https://github.com/llvm/llvm-project
  Commit: 3351e1b142a8ef097f15766e363c2ecb5b8f7e5f
      https://github.com/llvm/llvm-project/commit/3351e1b142a8ef097f15766e363c2ecb5b8f7e5f
  Author: David Green <david.green at arm.com>
  Date:   2025-02-07 (Fri, 07 Feb 2025)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64Subtarget.cpp
    M llvm/lib/Target/AArch64/AArch64Subtarget.h
    M llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
    M llvm/test/CodeGen/AArch64/Atomics/aarch64-atomic-load-rcpc_immo.ll

  Log Message:
  -----------
  [AArch64] Enable AvoidLDAPUR for cpu=generic between armv8.4 and armv9.3. (#125261)

As added in #124274, CPUs in this range can suffer from performance
issues with ldapur. As the gain from ldar->ldapr is expected to be
greater than the minor gain from ldapr->ldapur, this opts to avoid the
instruction under the default -mcpu=generic when the -march is less that
armv8.8 / armv9.3.

I renamed AArch64Subtarget::Others to AArch64Subtarget::Generic to be
clearer what it means.

(cherry picked from commit 6424abcd6c9c6aa8171c79d0fe0369d3a10da3d5)



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