diff options
| -rw-r--r-- | lib/CodeGen/SelectionDAG/SelectionDAG.cpp | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp index 3fdc7fe995..25ec8ff052 100644 --- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp +++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp @@ -428,6 +428,15 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT, if (Operand.getValueType() == VT) return Operand; // noop truncate if (OpOpcode == ISD::TRUNCATE) return getNode(ISD::TRUNCATE, VT, Operand.Val->getOperand(0)); + else if (OpOpcode == ISD::ZERO_EXTEND || OpOpcode == ISD::SIGN_EXTEND) { + // If the source is smaller than the dest, we still need an extend. + if (Operand.Val->getOperand(0).getValueType() < VT) + return getNode(OpOpcode, VT, Operand.Val->getOperand(0)); + else if (Operand.Val->getOperand(0).getValueType() > VT) + return getNode(ISD::TRUNCATE, VT, Operand.Val->getOperand(0)); + else + return Operand.Val->getOperand(0); + } break; } |