[PATCH] D47339: [GVN,NewGVN] Propagate nonnull if K dominates J.

[Florian Hahn via Phabricator via llvm-commits]

fhahn created this revision.
fhahn added reviewers: dberlin, davide, efriedma.
Herald added a subscriber: Prazek.

In combineMetadata, we should be able to preserve K's nonnull metadata,
if K dominates J. This condition should hold for all replacements by
NewGVN/GVN, but I added a bunch of assertions to verify that.

Fixes PR35038.

There probably are additional kinds of metadata that could be preserved
using similar reasoning. This is follow-up work.


https://reviews.llvm.org/D47339

Files:
  include/llvm/Analysis/Utils/Local.h
  lib/Transforms/Scalar/GVN.cpp
  lib/Transforms/Scalar/NewGVN.cpp
  lib/Transforms/Utils/Local.cpp
  test/Transforms/NewGVN/metadata-nonnull.ll

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