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

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon updated this revision to Diff 162720.
RKSimon added a comment.

On pre-SSE41 targets use PSLLQ+PSRLQ to zero-extend v16i8/v8i16 splat shift amounts - this affects a number of extra tests - if accepted I'll push the PSLLQ+PSRLQ change before the vXi8 support.


Repository:
  rL LLVM

https://reviews.llvm.org/D51263

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/lower-vec-shift-2.ll
  test/CodeGen/X86/vector-rotate-128.ll
  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
  test/CodeGen/X86/vshift-1.ll
  test/CodeGen/X86/vshift-2.ll
  test/CodeGen/X86/vshift-3.ll
  test/CodeGen/X86/vshift-4.ll

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