[PATCH] D38506: [X86][SSE] Improve shuffling combining with horizontal operations

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.

Recognise cases when we can merge the shuffles with their horizontal (HADD/HSUB/PACK) instruction inputs.

Replaces an older implementation which performed some of this during lowering, expanding an existing target shuffle combine stage instead.


Repository:
  rL LLVM

https://reviews.llvm.org/D38506

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/bitcast-and-setcc-256.ll
  test/CodeGen/X86/bitcast-and-setcc-512.ll
  test/CodeGen/X86/horizontal-shuffle.ll
  test/CodeGen/X86/psubus.ll
  test/CodeGen/X86/vector-compare-results.ll
  test/CodeGen/X86/vector-trunc.ll

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