[PATCH] D118907: [TypePromotion] Allow SExtInst as sink

[Sam Parker via Phabricator via llvm-commits]

samparker created this revision.
samparker added reviewers: dmgreen, avieira, adriantong1024, craig.topper.
Herald added subscribers: hiraditya, kristof.beyls.
samparker requested review of this revision.
Herald added a project: LLVM.

If these instructions are in the tree, then they're almost certainly going to need a sign extend anyway, so having a trunc in the IR to handle them shouldn't cause any harm. I also noticed some significantly better codegen when targeting arm on one of the IR tests.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D118907

Files:
  llvm/lib/CodeGen/TypePromotion.cpp
  llvm/test/Transforms/TypePromotion/ARM/casts.ll

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