Amara Emerson 761ca2e53b [AArch64][GlobalISel] Add an optimization to select vector DUP instructions.
This adds pattern matching for the insert+shufflevector sequence so we can
generate dup instructions instead of the current TBL sequence.

Differential Revision: https://reviews.llvm.org/D59558

llvm-svn: 356526
2019-03-19 21:43:05 +00:00
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