[PATCH] D143786: [X86] Add `TuningPreferShiftShuffle` for when Shifts are preferable to shuffles.

[Noah Goldstein via Phabricator via llvm-commits]

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SKX has an objectively faster shift than shuffle, on all other targets
the two have equal performance (with maybe a slight preference for
shifts because p5 is a more common bottleneck).


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D143786

Files:
  llvm/lib/Target/X86/X86.td
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/lib/Target/X86/X86Subtarget.h
  llvm/lib/Target/X86/X86TargetTransformInfo.h
  llvm/test/CodeGen/X86/avx512-hadd-hsub.ll
  llvm/test/CodeGen/X86/min-legal-vector-width.ll
  llvm/test/CodeGen/X86/pr57340.ll

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