[PATCH] D159186: [AArch64][SME] Enable TPIDR2 lazy-save for za_preserved

[Matt Devereau via Phabricator via llvm-commits]

MattDevereau created this revision.
MattDevereau added reviewers: sdesmalen, kmclaughlin.
Herald added subscribers: jdoerfert, hiraditya, kristof.beyls.
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MattDevereau requested review of this revision.
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This change makes callees with the __arm_preserves_za
type attribute comply with the dormant state requirements
when it's caller has the __arm_shared_za type attribute

https://github.com/ARM-software/abi-aa/blob/5e67092434b50c04f8ad178a9c272ce3c6ada7fd/aapcs64/aapcs64.rst?plain=1#L1381


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D159186

Files:
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/lib/Target/AArch64/Utils/AArch64SMEAttributes.cpp
  llvm/lib/Target/AArch64/Utils/AArch64SMEAttributes.h
  llvm/test/CodeGen/AArch64/sme-lazy-save-call.ll
  llvm/unittests/Target/AArch64/SMEAttributesTest.cpp

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