[all-commits] [llvm/llvm-project] f849b1: Reland "[ObjCARC][Contract] Optimize bundled Retai...

[Marina Taylor via All-commits]

  Branch: refs/heads/users/citymarina/objc-claim-3b-reland
  Home:   https://github.com/llvm/llvm-project
  Commit: f849b10e97161ad55415cdf6a48091058c4968e2
      https://github.com/llvm/llvm-project/commit/f849b10e97161ad55415cdf6a48091058c4968e2
  Author: Marina Taylor <marina_taylor at apple.com>
  Date:   2025-05-14 (Wed, 14 May 2025)

  Changed paths:
    M llvm/lib/Transforms/ObjCARC/ARCRuntimeEntryPoints.h
    M llvm/lib/Transforms/ObjCARC/CMakeLists.txt
    M llvm/lib/Transforms/ObjCARC/ObjCARC.cpp
    M llvm/lib/Transforms/ObjCARC/ObjCARC.h
    M llvm/lib/Transforms/ObjCARC/ObjCARCContract.cpp
    M llvm/lib/Transforms/ObjCARC/ObjCARCOpts.cpp
    A llvm/test/Transforms/ObjCARC/contract-attached-call-retain-to-claim.ll

  Log Message:
  -----------
  Reland "[ObjCARC][Contract] Optimize bundled RetainRV to ClaimRV"

This teaches ObjCARCContract to transform attachedcall bundles
referencing objc_retainAutoreleasedReturnValue to instead
reference objc_claimAutoreleasedReturnValue.

The only distinction between the two is that the latter is required
to be guaranteed to immediately follow the call it's attached to,
and, by construction, the bundles always achieve that by:
- not being separable from the call through IR and the backend
- not getting the marker emitted when claimARV is the attachedcall.

This is enabled only for arm64, arm64e, and arm64_32 on
macOS13/iOS16 and related operating systems.

Co-authored-by: Ahmed Bougacha <ahmed at bougacha.org>



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