[PATCH] D96099: [AArch64][GlobalISel] Support the 'returned' parameter attribute.

[Amara Emerson via Phabricator via llvm-commits]

aemerson created this revision.
aemerson added reviewers: paquette, arsenm, t.p.northover.
aemerson added a project: LLVM.
Herald added subscribers: danielkiss, hiraditya, kristof.beyls, rovka.
aemerson requested review of this revision.
Herald added a subscriber: wdng.

On AArch64 (which seems to be the only target that supports it), this attribute allows codegen to avoid saving/restoring the value in x0 across a call.

Gives a 0.1% geomean -Os code size improvement on CTMark.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D96099

Files:
  llvm/include/llvm/CodeGen/GlobalISel/CallLowering.h
  llvm/include/llvm/CodeGen/TargetCallingConv.h
  llvm/lib/CodeGen/GlobalISel/CallLowering.cpp
  llvm/lib/Target/AArch64/GISel/AArch64CallLowering.cpp
  llvm/test/CodeGen/AArch64/GlobalISel/arm64-irtranslator-switch.ll
  llvm/test/CodeGen/AArch64/arm64-this-return.ll

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