[PATCH] D15310: [X86][AVX] Fold loads + splats into broadcast instructions

[Simon Pilgrim via llvm-commits]

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On AVX and AVX2, BROADCAST instructions can load a scalar into all elements of a target vector.

This patch improves the lowering of 'splat' shuffles of a loaded vector into a broadcast - currently the lowering only works for cases where we are splatting the zero'th element, which is now generalised to any element.

Fix for PR23022

Repository:
  rL LLVM

http://reviews.llvm.org/D15310

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/avx-splat.ll
  test/CodeGen/X86/avx-vbroadcast.ll
  test/CodeGen/X86/avx2-vbroadcast.ll
  test/CodeGen/X86/vector-shuffle-256-v4.ll

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