[PATCH] D51263: [X86][SSE] Improve variable scalar shift of vXi8 vectors (PR34694)

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: craig.topper, lebedev.ri, spatel, pcordes.
RKSimon added a reviewer: efriedma.

As suggested by PR34694, this patch performs the creation of the shift mask as a scalar before splatting back to the vector unit to perform the shift using the vXi16 vector shift ops.


Repository:
  rL LLVM

https://reviews.llvm.org/D51263

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/vector-rotate-512.ll
  test/CodeGen/X86/vector-shift-ashr-128.ll
  test/CodeGen/X86/vector-shift-ashr-256.ll
  test/CodeGen/X86/vector-shift-ashr-512.ll
  test/CodeGen/X86/vector-shift-lshr-128.ll
  test/CodeGen/X86/vector-shift-lshr-256.ll
  test/CodeGen/X86/vector-shift-lshr-512.ll
  test/CodeGen/X86/vector-shift-shl-128.ll
  test/CodeGen/X86/vector-shift-shl-256.ll
  test/CodeGen/X86/vector-shift-shl-512.ll

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