[PATCH] D141275: [AArch64] Sink to umull if we know tops bits are zero.

[Dave Green via Phabricator via llvm-commits]

dmgreen created this revision.
dmgreen added reviewers: bipmis, samtebbs, SjoerdMeijer, fhahn, NickGuy.
Herald added subscribers: StephenFan, hiraditya, kristof.beyls.
Herald added a project: All.
dmgreen requested review of this revision.
Herald added a project: LLVM.

This is an extension to the code for sinking splats to multiplies, where if we can detect that the top bits are known-zero we can treat the instruction like a zext. The existing code was also adjusted in the process to make it more precise about only sink if both operands are zext or sext.


https://reviews.llvm.org/D141275

Files:
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/test/CodeGen/AArch64/aarch64-matrix-umull-smull.ll
  llvm/test/CodeGen/AArch64/sve-loopforms.ll
  llvm/test/Transforms/CodeGenPrepare/AArch64/sink-free-instructions.ll

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