diff options
Diffstat (limited to 'lib/CodeGen/SelectionDAG/SelectionDAG.cpp')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/SelectionDAG.cpp | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp index 75e07ca762..8a34a59a15 100644 --- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp +++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp @@ -1183,12 +1183,17 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT, if (N2.getOpcode() == ISD::SUB && isa<ConstantSDNode>(N2.getOperand(0)) && cast<ConstantSDNode>(N2.getOperand(0))->getValue() == 0) return getNode(ISD::SUB, VT, N1, N2.getOperand(1)); // A+(0-B) -> A-B + if (N2.getOpcode() == ISD::SUB && N1 == N2.Val->getOperand(1) && + !MVT::isFloatingPoint(N2.getValueType())) + return N2.Val->getOperand(0); // A+(B-A) -> B break; case ISD::SUB: if (N1.getOpcode() == ISD::ADD) { - if (N1.Val->getOperand(0) == N2) + if (N1.Val->getOperand(0) == N2 && + !MVT::isFloatingPoint(N2.getValueType())) return N1.Val->getOperand(1); // (A+B)-A == B - if (N1.Val->getOperand(1) == N2) + if (N1.Val->getOperand(1) == N2 && + !MVT::isFloatingPoint(N2.getValueType())) return N1.Val->getOperand(0); // (A+B)-B == A } if (N2.getOpcode() == ISD::FNEG) // (A- (-B) -> A+B |