diff options
Diffstat (limited to 'include/llvm/CodeGen/SelectionDAG.h')
| -rw-r--r-- | include/llvm/CodeGen/SelectionDAG.h | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/include/llvm/CodeGen/SelectionDAG.h b/include/llvm/CodeGen/SelectionDAG.h index d55dd7f..33ebd00 100644 --- a/include/llvm/CodeGen/SelectionDAG.h +++ b/include/llvm/CodeGen/SelectionDAG.h @@ -63,6 +63,10 @@ enum CombineLevel { NoIllegalOperations // Combine may only create legal operations and types. }; +class SelectionDAG; +void checkForCycles(const SDNode *N); +void checkForCycles(const SelectionDAG *DAG); + /// SelectionDAG class - This is used to represent a portion of an LLVM function /// in a low-level Data Dependence DAG representation suitable for instruction /// selection. This DAG is constructed as the first step of instruction @@ -204,7 +208,12 @@ public: const SDValue &setRoot(SDValue N) { assert((!N.getNode() || N.getValueType() == MVT::Other) && "DAG root value is not a chain!"); - return Root = N; + if (N.getNode()) + checkForCycles(N.getNode()); + Root = N; + if (N.getNode()) + checkForCycles(this); + return Root; } /// Combine - This iterates over the nodes in the SelectionDAG, folding |
