[all-commits] [llvm/llvm-project] 6ec2c5: GC-parseable element atomic memcpy/memmove

[arpilipe via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 6ec2c5e402a724ba99bce82a9cac7a3006d660f4
      https://github.com/llvm/llvm-project/commit/6ec2c5e402a724ba99bce82a9cac7a3006d660f4
  Author: Artur Pilipenko <apilipenko at azul.com>
  Date:   2020-10-23 (Fri, 23 Oct 2020)

  Changed paths:
    M llvm/docs/LangRef.rst
    M llvm/docs/Statepoints.rst
    M llvm/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp
    M llvm/lib/Transforms/Utils/Local.cpp
    A llvm/test/Transforms/RewriteStatepointsForGC/unordered-atomic-memcpy-no-deopt.ll
    A llvm/test/Transforms/RewriteStatepointsForGC/unordered-atomic-memcpy.ll

  Log Message:
  -----------
  GC-parseable element atomic memcpy/memmove

This change introduces a GC parseable lowering for element atomic
memcpy/memmove intrinsics. This way runtime can provide an
implementation which can take a safepoint during copy operation.

See "GC-parseable element atomic memcpy/memmove" thread on llvm-dev
for the background and details:
https://groups.google.com/g/llvm-dev/c/NnENHzmX-b8/m/3PyN8Y2pCAAJ

Differential Revision: https://reviews.llvm.org/D88861