[PATCH] D65700: [Transforms] Do not drop !preserve.access.index metadata

[Yonghong Song via Phabricator via llvm-commits]

yonghong-song created this revision.
yonghong-song added a reviewer: ast.
Herald added subscribers: llvm-commits, arphaman, hiraditya.
Herald added a project: LLVM.

Currently, when a GVN or CSE optimization happens,
the llvm.preserve.access.index metadata is dropped.
This caused a problem for BPF AbstructMemberOffset phase
as it relies on the metadata (debuginfo types).

This patch added proper hooks in lib/Transforms to
preserve !preserve.access.index metadata. A test
case is added to ensure metadata is preserved under CSE.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D65700

Files:
  llvm/lib/Transforms/Utils/Local.cpp
  llvm/lib/Transforms/Utils/SimplifyCFG.cpp
  llvm/test/CodeGen/BPF/CORE/intrinsic-transforms.ll

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