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| author | Simon Pilgrim <llvm-dev@redking.me.uk> | 2019-08-12 10:56:05 +0000 |
|---|---|---|
| committer | Simon Pilgrim <llvm-dev@redking.me.uk> | 2019-08-12 10:56:05 +0000 |
| commit | 05e8209e3347f636e93af9182c913259ec2bbffa (patch) | |
| tree | 96ff6221c7582dcec6d7fc409b58f7bf40b34a2b /llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp | |
| parent | ef58804ebc196fe54731e31d7db817471038084c (diff) | |
| download | bcm5719-llvm-05e8209e3347f636e93af9182c913259ec2bbffa.tar.gz bcm5719-llvm-05e8209e3347f636e93af9182c913259ec2bbffa.zip | |
[TargetLowering] SimplifyDemandedBits - call SimplifyMultipleUseDemandedBits for ISD::TRUNCATE
llvm-svn: 368553
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()) { |
