diff options
Diffstat (limited to 'llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp b/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp index 411d146e2ab..9027bea0390 100644 --- a/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp @@ -1700,6 +1700,11 @@ bool TargetLowering::SimplifyDemandedBits( return true; Known = Known.trunc(BitWidth); + // Attempt to avoid multi-use ops if we don't need anything from them. + if (SDValue NewSrc = SimplifyMultipleUseDemandedBits( + Src, TruncMask, DemandedElts, TLO.DAG, Depth + 1)) + return TLO.CombineTo(Op, TLO.DAG.getNode(ISD::TRUNCATE, dl, VT, NewSrc)); + // If the input is only used by this truncate, see if we can shrink it based // on the known demanded bits. if (Src.getNode()->hasOneUse()) { |
