[PATCH] D66167: MemTag: stack initializer merging.

[Evgenii Stepanov via Phabricator via llvm-commits]

eugenis created this revision.
eugenis added reviewers: pcc, vitalybuka, ostannard.
Herald added subscribers: hiraditya, javed.absar, srhines.
Herald added a project: LLVM.

MTE provides instructions to update memory tags and data at the same
time. This change makes use of those to generate more compact code for
stack variable tagging + initialization.

We collect memory store and memset instructions following an alloca or a
lifetime.start call, and replace them with the corresponding MTE
intrinsics. Since the intrinsics work on 16-byte aligned chunks, the
stored values are combined as necessary.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D66167

Files:
  llvm/lib/Target/AArch64/AArch64.h
  llvm/lib/Target/AArch64/AArch64StackTagging.cpp
  llvm/lib/Target/AArch64/AArch64TargetMachine.cpp
  llvm/test/CodeGen/AArch64/O3-pipeline.ll
  llvm/test/CodeGen/AArch64/stack-tagging-initializer-merge.ll

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