[PATCH] D37680: [X86][SSE] Add support for X86ISD::PACKSS to ComputeNumSignBitsForTargetNode

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.

Helps improve combineLogicBlendIntoPBLENDV support by allowing us to peek into through PACKSS truncations of vector comparison results


Repository:
  rL LLVM

https://reviews.llvm.org/D37680

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/bitcast-and-setcc-512.ll
  test/CodeGen/X86/vselect-packss.ll

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