[PATCH] D132185: [TTI][AArch64] Update vector extract cost for Neoverse-N1.

[Vasileios Porpodas via Phabricator via llvm-commits]

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According to the ARM Neoverse-N1 Software Optimization Guide the
extract instructions have a latency of 2 and a throughput of 2.
TTI returns a cost of 3, which seems too high.

PEXTR in x86 has a latency of 3 and throughput of 1, according to
https://www.agner.org/optimize/instruction_tables.pdf for Skylake,
yet TTI returns 1.

This patch sets the vector extract cost to 1.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D132185

Files:
  llvm/lib/Target/AArch64/AArch64Subtarget.cpp
  llvm/test/Analysis/CostModel/AArch64/vector-extract.ll

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