/// node list.
SelectionDAG::allnodes_iterator ISelPosition;
-/// IsChainCompatible - Returns true if Chain is Op or Chain does
-/// not reach Op.
-static bool IsChainCompatible(SDNode *Chain, SDNode *Op) {
+/// ChainNotReachable - Returns true if Chain does not reach Op.
+static bool ChainNotReachable(SDNode *Chain, SDNode *Op) {
if (Chain->getOpcode() == ISD::EntryToken)
return true;
if (Chain->getOpcode() == ISD::TokenFactor)
if (Chain->getNumOperands() > 0) {
SDValue C0 = Chain->getOperand(0);
if (C0.getValueType() == MVT::Other)
- return C0.getNode() != Op && IsChainCompatible(C0.getNode(), Op);
+ return C0.getNode() != Op && ChainNotReachable(C0.getNode(), Op);
}
return true;
}
+/// IsChainCompatible - Returns true if Chain is Op or Chain does not reach Op.
+/// This is used to ensure that there are no nodes trapped between Chain, which
+/// is the first chain node discovered in a pattern and Op, a later node, that
+/// will not be selected into the pattern.
+static bool IsChainCompatible(SDNode *Chain, SDNode *Op) {
+ return Chain == Op || ChainNotReachable(Chain, Op);
+}
+
+
/// ISelUpdater - helper class to handle updates of the
/// instruciton selection graph.
class VISIBILITY_HIDDEN ISelUpdater : public SelectionDAG::DAGUpdateListener {