Amara Emerson d8ba622209 [AArch64][GlobalISel] Selection support for vector DUP[X]lane instructions. ...

In future, we'd like to use the perfect-shuffle mechanism to deal with these
shuffle permutations. For now, this improves performance by avoiding the
super-expensive const-pool load + tbl instruction.

Differential Revision: https://reviews.llvm.org/D84866

2020-07-29 11:41:37 -07:00

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