[SelectionDAG][X86] CombineBT - more aggressively determine demanded bits
This patch is in 2 parts:
1 - replace combineBT's use of SimplifyDemandedBits (hasOneUse only) with SelectionDAG::GetDemandedBits to more aggressively determine the lower bits used by BT.
2 - update SelectionDAG::GetDemandedBits to support ANY_EXTEND - if the demanded bits are only in the non-extended portion, then peek through and demand from the source value and then ANY_EXTEND that if we found a match.
Differential Revision: https://reviews.llvm.org/D35896
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@309486 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed