[PATCH] D28604: [X86][AVX512] Add support for variable ASHR v2i64/v4i64 support without VLX

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: mkuper, craig.topper, delena, igorb.
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Use v8i64 variable ASHR instructions if we don't have VLX.

This is a reduced version of https://reviews.llvm.org/D28537 that just adds support for variable shifts - I'll continue with that patch (for just constant/uniform shifts) once I've fixed the type legalization issue in avx512-cvt.ll, but this is ready to go now.


Repository:
  rL LLVM

https://reviews.llvm.org/D28604

Files:
  lib/Target/X86/X86ISelLowering.cpp
  lib/Target/X86/X86InstrAVX512.td
  test/CodeGen/X86/vector-shift-ashr-128.ll
  test/CodeGen/X86/vector-shift-ashr-256.ll

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