[PATCH] D121139: [AArch64] TBL uses zero for out of range elements.

[Dave Green via Phabricator via llvm-commits]

dmgreen created this revision.
dmgreen added reviewers: SjoerdMeijer, sdesmalen, samtebbs, jaykang10, fhahn.
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A TBL instruction will use zero for any out of range values. We can use this in GenerateTBL to help turn a TBL2 into a TBL1, avoiding the need to materialise the zero.


https://reviews.llvm.org/D121139

Files:
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/test/CodeGen/AArch64/neon-bitwise-instructions.ll
  llvm/test/CodeGen/AArch64/vselect-ext.ll

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