diff options
Diffstat (limited to 'lib/CodeGen/SelectionDAG/DAGCombiner.cpp')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 22 |
1 files changed, 18 insertions, 4 deletions
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index ed026084aa..9ce6a8fa9b 100644 --- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -4159,13 +4159,27 @@ SDOperand DAGCombiner::SimplifySelectCC(SDOperand N0, SDOperand N1, // Check to see if this is an integer abs. select_cc setl[te] X, 0, -X, X -> // Y = sra (X, size(X)-1); xor (add (X, Y), Y) if (N1C && N1C->isNullValue() && (CC == ISD::SETLT || CC == ISD::SETLE) && - N0 == N3 && N2.getOpcode() == ISD::SUB && N0 == N2.getOperand(1)) { - if (ConstantSDNode *SubC = dyn_cast<ConstantSDNode>(N2.getOperand(0))) { + N0 == N3 && N2.getOpcode() == ISD::SUB && N0 == N2.getOperand(1) && + N2.getOperand(0) == N1 && MVT::isInteger(N0.getValueType())) { + MVT::ValueType XType = N0.getValueType(); + SDOperand Shift = DAG.getNode(ISD::SRA, XType, N0, + DAG.getConstant(MVT::getSizeInBits(XType)-1, + TLI.getShiftAmountTy())); + SDOperand Add = DAG.getNode(ISD::ADD, XType, N0, Shift); + AddToWorkList(Shift.Val); + AddToWorkList(Add.Val); + return DAG.getNode(ISD::XOR, XType, Add, Shift); + } + // Check to see if this is an integer abs. select_cc setgt X, -1, X, -X -> + // Y = sra (X, size(X)-1); xor (add (X, Y), Y) + if (N1C && N1C->isAllOnesValue() && CC == ISD::SETGT && + N0 == N2 && N3.getOpcode() == ISD::SUB && N0 == N3.getOperand(1)) { + if (ConstantSDNode *SubC = dyn_cast<ConstantSDNode>(N3.getOperand(0))) { MVT::ValueType XType = N0.getValueType(); if (SubC->isNullValue() && MVT::isInteger(XType)) { SDOperand Shift = DAG.getNode(ISD::SRA, XType, N0, DAG.getConstant(MVT::getSizeInBits(XType)-1, - TLI.getShiftAmountTy())); + TLI.getShiftAmountTy())); SDOperand Add = DAG.getNode(ISD::ADD, XType, N0, Shift); AddToWorkList(Shift.Val); AddToWorkList(Add.Val); @@ -4173,7 +4187,7 @@ SDOperand DAGCombiner::SimplifySelectCC(SDOperand N0, SDOperand N1, } } } - + return SDOperand(); } |