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path: root/llvm/test/CodeGen/AArch64/concat_vector-truncated-scalar-combine.ll
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* [CodeGen] Combine concat_vector of trunc'd scalar to scalar_to_vector.Ahmed Bougacha2015-04-091-0/+18
We already do: concat_vectors(scalar, undef) -> scalar_to_vector(scalar) When the scalar is legal. When it's not, but is a truncated legal scalar, we can also do: concat_vectors(trunc(scalar), undef) -> scalar_to_vector(scalar) Which is equivalent, since the upper lanes are undef anyway. While there, teach the combine to look at more than 2 operands. Differential Revision: http://reviews.llvm.org/D8883 llvm-svn: 234530