diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/LegalizeDAG.cpp | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp index adb88bf9b1..020a373844 100644 --- a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp +++ b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp @@ -1534,6 +1534,34 @@ SDOperand SelectionDAGLegalize::PromoteOp(SDOperand Op) { AddLegalizedOperand(Op.getValue(1), Result.getValue(1)); break; } + case ISD::CTPOP: + case ISD::CTTZ: + case ISD::CTLZ: + Tmp1 = Node->getOperand(0); + //Zero extend the argument + Tmp1 = DAG.getNode(ISD::ZERO_EXTEND, NVT, Tmp1); + // Perform the larger operation, then subtract if needed. + Tmp1 = DAG.getNode(Node->getOpcode(), NVT, Tmp1); + switch(Node->getOpcode()) + { + case ISD::CTPOP: + Result = Tmp1; + break; + case ISD::CTTZ: + //if Tmp1 == sizeinbits(NVT) then Tmp1 = sizeinbits(Old VT) + Tmp2 = DAG.getSetCC(ISD::SETEQ, MVT::i1, Tmp1, + DAG.getConstant(getSizeInBits(NVT), NVT)); + Result = DAG.getNode(ISD::SELECT, NVT, Tmp2, + DAG.getConstant(getSizeInBits(VT),NVT), Tmp1); + break; + case ISD::CTLZ: + //Tmp1 = Tmp1 - (sizeinbits(NVT) - sizeinbits(Old VT)) + Result = DAG.getNode(ISD::SUB, NVT, Tmp1, + DAG.getConstant(getSizeInBits(NVT) - + getSizeInBits(VT), NVT)); + break; + } + break; } assert(Result.Val && "Didn't set a result!"); |