diff options
Diffstat (limited to 'lib/CodeGen/SelectionDAG/SelectionDAG.cpp')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/SelectionDAG.cpp | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp index fe33ff5ed4..4c21eff3a6 100644 --- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp +++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp @@ -2534,7 +2534,8 @@ bool SDNode::hasNUsesOfValue(unsigned NUses, unsigned Value) const { } -// isOnlyUse - Return true if this node is the only use of N. +/// isOnlyUse - Return true if this node is the only use of N. +/// bool SDNode::isOnlyUse(SDNode *N) const { bool Seen = false; for (SDNode::use_iterator I = N->use_begin(), E = N->use_end(); I != E; ++I) { @@ -2548,7 +2549,8 @@ bool SDNode::isOnlyUse(SDNode *N) const { return Seen; } -// isOperand - Return true if this node is an operand of N. +/// isOperand - Return true if this node is an operand of N. +/// bool SDOperand::isOperand(SDNode *N) const { for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) if (*this == N->getOperand(i)) @@ -2578,7 +2580,10 @@ static void findPredecessor(SDNode *N, const SDNode *P, bool &found, } } -// isPredecessor - Return true if this node is a predecessor of N. +/// isPredecessor - Return true if this node is a predecessor of N. This node +/// is either an operand of N or it can be reached by recursively traversing +/// up the operands. +/// NOTE: this is an expensive method. Use it carefully. bool SDNode::isPredecessor(SDNode *N) const { std::set<SDNode *> Visited; bool found = false; |