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Added AssignTopologicalOrder() to assign each node an unique id based on their topological order.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29431 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2006-08-01 08:20:41 +00:00
parent db3cc3d7d6
commit e6f35d8a5c
2 changed files with 45 additions and 4 deletions
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9
include/llvm/CodeGen/SelectionDAG.h
View File

@ -422,10 +422,15 @@ public:
/// have no referrers.
void DeleteNode(SDNode *N);
/// AssignNodeIds - Assign a unique node id for each node in the DAG. It
/// returns the maximum id.
/// AssignNodeIds - Assign a unique node id for each node in the DAG based on
/// their allnodes order. It returns the maximum id.
unsigned AssignNodeIds();
/// AssignTopologicalOrder - Assign a unique node id for each node in the DAG
/// based on their topological order. It returns a vector of the SDNodes* in
/// assigned order.
std::vector<SDNode*> AssignTopologicalOrder();
void dump() const;
/// InsertISelMapEntry - A helper function to insert a key / element pair

40
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
View File

@ -28,6 +28,7 @@
#include <set>
#include <cmath>
#include <algorithm>
#include <deque>
using namespace llvm;
static bool isCommutativeBinOp(unsigned Opcode) {
@ -2698,8 +2699,8 @@ void SelectionDAG::ReplaceAllUsesOfValueWith(SDOperand From, SDOperand To,
}
/// AssignNodeIds - Assign a unique node id for each node in the DAG. It returns
/// the maximum id.
/// AssignNodeIds - Assign a unique node id for each node in the DAG based on
/// their allnodes order. It returns the maximum id.
unsigned SelectionDAG::AssignNodeIds() {
unsigned Id = 0;
for (allnodes_iterator I = allnodes_begin(), E = allnodes_end(); I != E; ++I){
@ -2709,6 +2710,41 @@ unsigned SelectionDAG::AssignNodeIds() {
return Id;
}
/// AssignTopologicalOrder - Assign a unique node id for each node in the DAG
/// based on their topological order. It returns a vector of the SDNodes* in
/// assigned order.
std::vector<SDNode*> SelectionDAG::AssignTopologicalOrder() {
unsigned DAGSize = AllNodes.size();
std::vector<SDNode*> TopOrder;
std::map<SDNode*, unsigned> InDegree;
std::deque<SDNode*> Sources;
for (allnodes_iterator I = allnodes_begin(),E = allnodes_end(); I != E; ++I){
SDNode *N = I;
unsigned Degree = N->use_size();
InDegree[N] = Degree;
if (Degree == 0)
Sources.push_back(I);
}
int Id = 0;
while (!Sources.empty()) {
SDNode *N = Sources.front();
Sources.pop_front();
TopOrder.push_back(N);
N->setNodeId(Id++);
for (SDNode::op_iterator I = N->op_begin(), E = N->op_end(); I != E; ++I) {
SDNode *P = I->Val;
unsigned Degree = InDegree[P] - 1;
if (Degree == 0)
Sources.push_back(P);
InDegree[P] = Degree;
}
}
return TopOrder;
}
//===----------------------------------------------------------------------===//
// SDNode Class