[PATCH] D86815: [LangRef] Remove non-overlapping guarantee from memcpy.

[Florian Hahn via Phabricator via llvm-commits]

fhahn created this revision.
Herald added subscribers: danielkiss, asbirlea, jfb, george.burgess.iv, hiraditya.
Herald added a reviewer: jdoerfert.
Herald added a project: LLVM.
fhahn requested review of this revision.

This adjusts the description of `llvm.memcpy` to not guarantee that the
pointer operands do not overlap. This is in line with what Clang
currently expects.

This change is intended to be temporary and followed by re-introduce
a variant with the non-overlapping guarantee for cases where we can
actually ensure that property in the front-end.

See the links below for more details:
http://lists.llvm.org/pipermail/cfe-dev/2020-August/066614.html
and PR11763.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D86815

Files:
  llvm/docs/LangRef.rst
  llvm/lib/Analysis/BasicAliasAnalysis.cpp
  llvm/test/Analysis/BasicAA/assume.ll
  llvm/test/Analysis/BasicAA/cs-cs.ll
  llvm/test/Analysis/BasicAA/guards.ll
  llvm/test/Analysis/MemorySSA/basicaa-memcpy.ll
  llvm/test/Transforms/DeadStoreElimination/MSSA/memset-and-memcpy.ll

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