[PATCH] D24253: [SelectionDAG] Add basic vector support to computeKnownBits and SimplifyDemandedBits

[Simon Pilgrim via llvm-commits]

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RKSimon added reviewers: bogner, arsenm, niravd, zvi, andreadb, spatel.
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Add the ability to computeKnownBits and SimplifyDemandedBits to extract the known zero/one bits from a BUILD_VECTOR, returning the known bits that are shared by every vector element.

This is an initial step towards determining the sign bits of a vector (PR29079).



Repository:
  rL LLVM

https://reviews.llvm.org/D24253

Files:
  lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  lib/CodeGen/SelectionDAG/TargetLowering.cpp
  test/CodeGen/AMDGPU/load-constant-i16.ll
  test/CodeGen/AMDGPU/load-global-i16.ll

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