[PATCH] D118973: [NVPTX] Eliminate StoreRetval instructions with undef operand

[Daniil Kovalev via Phabricator via llvm-commits]

kovdan01 created this revision.
kovdan01 added reviewers: tra, jholewinski, jlebar.
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Previously a lot of StoreRetval instructions with undef operand were generated
on NVPTX target when a big struct was returned by value. It resulted in a lot
of unneeded st.param.* instructions in final assembly. The patch solves the
issue by implementing the logic in NVPTX-specific part of DAG combiner.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D118973

Files:
  llvm/lib/Target/NVPTX/NVPTXISelLowering.cpp
  llvm/test/CodeGen/NVPTX/store-retval.ll

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