[PATCH] D50461: DAG: Don't use ABI copies in some contexts

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added reviewers: sdardis, bogner, nhaehnle.
Herald added subscribers: tpr, wdng.

If an ABI-like value is used in a different block,
the type split used is not necessarily the same as
the call's ABI. The value is used through an intermediate
copy virtual registers from the other block. This
resulted in copies with inconsistent sizes later.

      

Fixes regressions since r338197 when AMDGPU started
splitting vector types for calls.


https://reviews.llvm.org/D50461

Files:
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  test/CodeGen/AMDGPU/cross-block-use-is-not-abi-copy.ll

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