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Calculate the portion of reachbility matrix on demand.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29366 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2006-07-27 22:10:00 +00:00
parent 8cbc93aadb
commit 5fa5de80e2
1 changed files with 42 additions and 11 deletions
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47
lib/Target/X86/X86ISelDAGToDAG.cpp
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@ -124,7 +124,7 @@ namespace {
private:
void DetermineTopologicalOrdering();
void DeterminReachibility();
void DeterminReachibility(SDNode *f, SDNode *t);
void Select(SDOperand &Result, SDOperand N);
@ -186,7 +186,15 @@ namespace {
/// TopOrder - Topological ordering of all nodes in the DAG.
///
std::vector<SDNode*> TopOrder;
SDNode* *TopOrder;
/// IdToOrder - Node id to topological order map.
///
unsigned *IdToOrder;
/// RMRange - The range of reachibility information available for the
/// particular source node.
unsigned *RMRange;
/// ReachibilityMatrix - A N x N matrix representing all pairs reachibility
/// information. One bit per potential edge.
@ -221,8 +229,7 @@ bool X86DAGToDAGISel::IsFoldableBy(SDNode *N, SDNode *U) {
// / [X]
// | ^
// [U]--------|
if (!ReachibilityMatrix)
DeterminReachibility();
DeterminReachibility(U, N);
assert(isReachable(U, N) && "Attempting to fold a non-operand node?");
for (SDNode::op_iterator I = U->op_begin(), E = U->op_end(); I != E; ++I) {
SDNode *P = I->Val;
@ -236,7 +243,11 @@ bool X86DAGToDAGISel::IsFoldableBy(SDNode *N, SDNode *U) {
/// in the DAG.
void X86DAGToDAGISel::DetermineTopologicalOrdering() {
DAGSize = CurDAG->AssignNodeIds();
TopOrder.reserve(DAGSize);
TopOrder = new SDNode*[DAGSize];
IdToOrder = new unsigned[DAGSize];
memset(IdToOrder, 0, DAGSize * sizeof(unsigned));
RMRange = new unsigned[DAGSize];
memset(RMRange, 0, DAGSize * sizeof(unsigned));
std::vector<unsigned> InDegree(DAGSize);
std::list<SDNode*> Sources;
@ -254,6 +265,7 @@ void X86DAGToDAGISel::DetermineTopologicalOrdering() {
SDNode *N = Sources.front();
Sources.pop_front();
TopOrder[Order] = N;
IdToOrder[N->getNodeId()] = Order;
Order++;
for (SDNode::op_iterator I = N->op_begin(), E = N->op_end(); I != E; ++I) {
SDNode *P = I->Val;
@ -266,19 +278,31 @@ void X86DAGToDAGISel::DetermineTopologicalOrdering() {
}
}
void X86DAGToDAGISel::DeterminReachibility() {
void X86DAGToDAGISel::DeterminReachibility(SDNode *f, SDNode *t) {
if (!ReachibilityMatrix) {
DetermineTopologicalOrdering();
ReachibilityMatrix = new unsigned char[DAGSize * DAGSize];
memset(ReachibilityMatrix, 0, DAGSize * DAGSize * sizeof(unsigned char));
}
for (unsigned i = 0; i < DAGSize; ++i) {
int Idf = f->getNodeId();
int Idt = t->getNodeId();
unsigned Orderf = IdToOrder[Idf];
unsigned Ordert = IdToOrder[Idt];
unsigned Range = RMRange[Idf];
if (Range >= Ordert)
return;
if (Range < Orderf)
Range = Orderf;
for (unsigned i = Range; i < Ordert; ++i) {
SDNode *N = TopOrder[i];
setReachable(N, N);
// If N is a leaf node, there is nothing more to do.
if (N->getNumOperands() == 0)
continue;
for (unsigned i2 = 0; ; ++i2) {
for (unsigned i2 = Orderf; ; ++i2) {
SDNode *M = TopOrder[i2];
if (isReachable(M, N)) {
// Update reachibility from M to N's operands.
@ -288,6 +312,8 @@ void X86DAGToDAGISel::DeterminReachibility() {
if (M == N) break;
}
}
RMRange[Idf] = Ordert;
}
/// InstructionSelectBasicBlock - This callback is invoked by SelectionDAGISel
@ -308,7 +334,12 @@ void X86DAGToDAGISel::InstructionSelectBasicBlock(SelectionDAG &DAG) {
#endif
if (ReachibilityMatrix) {
delete[] ReachibilityMatrix;
delete[] TopOrder;
delete[] IdToOrder;
delete[] RMRange;
ReachibilityMatrix = NULL;
TopOrder = NULL;
IdToOrder = RMRange = NULL;
}
CodeGenMap.clear();
HandleMap.clear();