return NULL;
}
-/// findNonImmUse - Return true by reference in "found" if "Use" is an
-/// non-immediate use of "Def". This function recursively traversing
-/// up the operand chain ignoring certain nodes.
-static void findNonImmUse(SDNode *Use, SDNode* Def, SDNode *ImmedUse,
- SDNode *Root, bool &found,
+/// findNonImmUse - Return true if "Use" is a non-immediate use of "Def".
+/// This function recursively traverses up the operand chain, ignoring
+/// certain nodes.
+static bool findNonImmUse(SDNode *Use, SDNode* Def, SDNode *ImmedUse,
+ SDNode *Root,
SmallPtrSet<SDNode*, 16> &Visited) {
- if (found ||
- Use->getNodeId() < Def->getNodeId() ||
+ if (Use->getNodeId() < Def->getNodeId() ||
!Visited.insert(Use))
- return;
-
- for (unsigned i = 0, e = Use->getNumOperands(); !found && i != e; ++i) {
+ return false;
+
+ for (unsigned i = 0, e = Use->getNumOperands(); i != e; ++i) {
SDNode *N = Use->getOperand(i).getNode();
if (N == Def) {
if (Use == ImmedUse || Use == Root)
continue; // We are not looking for immediate use.
assert(N != Root);
- found = true;
- break;
+ return true;
}
// Traverse up the operand chain.
- findNonImmUse(N, Def, ImmedUse, Root, found, Visited);
+ if (findNonImmUse(N, Def, ImmedUse, Root, Visited))
+ return true;
}
+ return false;
}
/// isNonImmUse - Start searching from Root up the DAG to check is Def can
/// its chain operand.
static inline bool isNonImmUse(SDNode *Root, SDNode *Def, SDNode *ImmedUse) {
SmallPtrSet<SDNode*, 16> Visited;
- bool found = false;
- findNonImmUse(Root, Def, ImmedUse, Root, found, Visited);
- return found;
+ return findNonImmUse(Root, Def, ImmedUse, Root, Visited);
}