[PATCH] D93832: [AArch64] Handle any extend whilst lowering mull

[Dave Green via Phabricator via llvm-commits]

dmgreen created this revision.
dmgreen added reviewers: RKSimon, efriedma, SjoerdMeijer, NickGuy.
Herald added subscribers: danielkiss, hiraditya, kristof.beyls.
dmgreen requested review of this revision.
Herald added a project: LLVM.

Demanded bits may turn a sext or zext into an anyext if the top bits are not needed. This currently prevents the lowering to instructions like mull, addl and addw. This patch fixes the mull generation by keeping it simple and treating them like zextends.


https://reviews.llvm.org/D93832

Files:
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/test/CodeGen/AArch64/aarch64-smull.ll
  llvm/test/CodeGen/AArch64/lowerMUL-newload.ll

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