mirror of
https://github.com/c64scene-ar/llvm-6502.git
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Finally committing to the new scheduler. Still -sched=none by default.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23702 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Laskey
parent
851a22db2b
commit
fab66f6900
@ -190,13 +190,16 @@ public:
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};
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//===----------------------------------------------------------------------===//
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// Forward
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class NodeInfo;
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typedef std::vector<NodeInfo *> NIVector;
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typedef std::vector<NodeInfo *>::iterator NIIterator;
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//===----------------------------------------------------------------------===//
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///
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/// Node group - This struct is used to manage flagged node groups.
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///
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class NodeInfo;
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class NodeGroup : public std::vector<NodeInfo *> {
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class NodeGroup : public NIVector {
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private:
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int Pending; // Number of visits pending before
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// adding to order
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@ -232,7 +235,10 @@ public:
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unsigned Slot; // Node's time slot
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NodeGroup *Group; // Grouping information
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unsigned VRBase; // Virtual register base
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#ifndef NDEBUG
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unsigned Preorder; // Index before scheduling
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#endif
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// Ctor.
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NodeInfo(SDNode *N = NULL)
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: Pending(0)
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@ -264,7 +270,6 @@ public:
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else return Pending += I;
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}
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};
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typedef std::vector<NodeInfo *>::iterator NIIterator;
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//===----------------------------------------------------------------------===//
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@ -383,10 +388,9 @@ private:
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unsigned NodeCount; // Number of nodes in DAG
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NodeInfo *Info; // Info for nodes being scheduled
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std::map<SDNode *, NodeInfo *> Map; // Map nodes to info
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std::vector<NodeInfo*> Ordering; // Emit ordering of nodes
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NIVector Ordering; // Emit ordering of nodes
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ResourceTally<unsigned> Tally; // Resource usage tally
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unsigned NSlots; // Total latency
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std::map<SDNode *, unsigned> VRMap; // Node to VR map
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static const unsigned NotFound = ~0U; // Search marker
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public:
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@ -396,7 +400,7 @@ public:
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: BB(bb), DAG(D), TM(D.getTarget()), TII(*TM.getInstrInfo()),
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MRI(*TM.getRegisterInfo()), RegMap(BB->getParent()->getSSARegMap()),
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ConstPool(BB->getParent()->getConstantPool()),
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NSlots(0) {
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NodeCount(0), Info(NULL), Map(), Tally(), NSlots(0) {
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assert(&TII && "Target doesn't provide instr info?");
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assert(&MRI && "Target doesn't provide register info?");
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}
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@ -427,7 +431,9 @@ private:
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void IncludeNode(NodeInfo *NI);
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void VisitAll();
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void Schedule();
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void GatherNodeInfo();
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void IdentifyGroups();
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void GatherSchedulingInfo();
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void PrepareNodeInfo();
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bool isStrongDependency(NodeInfo *A, NodeInfo *B);
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bool isWeakDependency(NodeInfo *A, NodeInfo *B);
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void ScheduleBackward();
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@ -439,8 +445,8 @@ private:
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unsigned CreateVirtualRegisters(MachineInstr *MI,
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unsigned NumResults,
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const TargetInstrDescriptor &II);
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unsigned EmitDAG(SDOperand A);
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void printChanges(unsigned Index);
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void printSI(std::ostream &O, NodeInfo *NI) const;
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void print(std::ostream &O) const;
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inline void dump(const char *tag) const { std::cerr << tag; dump(); }
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@ -635,28 +641,34 @@ void SimpleSched::VisitAll() {
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}
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}
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/// GatherNodeInfo - Get latency and resource information about each node.
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///
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void SimpleSched::GatherNodeInfo() {
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// Allocate node information
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Info = new NodeInfo[NodeCount];
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// Get base of all nodes table
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SelectionDAG::allnodes_iterator AllNodes = DAG.allnodes_begin();
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// For each node being scheduled
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/// IdentifyGroups - Put flagged nodes into groups.
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///
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void SimpleSched::IdentifyGroups() {
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for (unsigned i = 0, N = NodeCount; i < N; i++) {
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// Get next node from DAG all nodes table
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SDNode *Node = AllNodes[i];
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// Fast reference to node schedule info
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NodeInfo* NI = &Info[i];
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// Set up map
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Map[Node] = NI;
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// Set node
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NI->Node = Node;
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// Set pending visit count
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NI->setPending(Node->use_size());
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SDNode *Node = NI->Node;
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// For each operand (in reverse to only look at flags)
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for (unsigned N = Node->getNumOperands(); 0 < N--;) {
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// Get operand
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SDOperand Op = Node->getOperand(N);
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// No more flags to walk
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if (Op.getValueType() != MVT::Flag) break;
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// Add to node group
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NodeGroup::Add(getNI(Op.Val), NI);
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}
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}
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}
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/// GatherSchedulingInfo - Get latency and resource information about each node.
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///
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void SimpleSched::GatherSchedulingInfo() {
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for (unsigned i = 0, N = NodeCount; i < N; i++) {
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NodeInfo* NI = &Info[i];
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SDNode *Node = NI->Node;
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MVT::ValueType VT = Node->getValueType(0);
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if (Node->isTargetOpcode()) {
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MachineOpCode TOpc = Node->getTargetOpcode();
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// FIXME: This is an ugly (but temporary!) hack to test the scheduler
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@ -701,21 +713,28 @@ void SimpleSched::GatherNodeInfo() {
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// Sum up all the latencies for max tally size
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NSlots += NI->Latency;
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}
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}
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// Put flagged nodes into groups
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/// PrepareNodeInfo - Set up the basic minimum node info for scheduling.
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///
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void SimpleSched::PrepareNodeInfo() {
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// Allocate node information
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Info = new NodeInfo[NodeCount];
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// Get base of all nodes table
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SelectionDAG::allnodes_iterator AllNodes = DAG.allnodes_begin();
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// For each node being scheduled
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for (unsigned i = 0, N = NodeCount; i < N; i++) {
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// Get next node from DAG all nodes table
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SDNode *Node = AllNodes[i];
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// Fast reference to node schedule info
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NodeInfo* NI = &Info[i];
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SDNode *Node = NI->Node;
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// For each operand (in reverse to only look at flags)
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for (unsigned N = Node->getNumOperands(); 0 < N--;) {
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// Get operand
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SDOperand Op = Node->getOperand(N);
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// No more flags to walk
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if (Op.getValueType() != MVT::Flag) break;
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// Add to node group
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NodeGroup::Add(getNI(Op.Val), NI);
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}
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// Set up map
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Map[Node] = NI;
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// Set node
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NI->Node = Node;
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// Set pending visit count
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NI->setPending(Node->use_size());
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}
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}
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@ -784,7 +803,7 @@ void SimpleSched::ScheduleBackward() {
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for (; j < N; j++) {
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// Get following instruction
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NodeInfo *Other = Ordering[j];
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// Should we look further
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// Should we look further (remember slots are in reverse time)
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if (Slot >= Other->Slot) break;
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// Shuffle other into ordering
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Ordering[j - 1] = Other;
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@ -837,7 +856,7 @@ void SimpleSched::ScheduleForward() {
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// Insert sort based on slot
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j = i;
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for (; 0 < j--;) {
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// Get following instruction
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// Get prior instruction
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NodeInfo *Other = Ordering[j];
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// Should we look further
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if (Slot >= Other->Slot) break;
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@ -856,11 +875,8 @@ void SimpleSched::EmitAll() {
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for (unsigned i = 0, N = Ordering.size(); i < N; i++) {
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// Get the scheduling info
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NodeInfo *NI = Ordering[i];
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#if 0
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// Iterate through nodes
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NodeGroupIterator NGI(Ordering[i]);
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while (NodeInfo *NI = NGI.next()) EmitNode(NI);
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#else
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if (NI->isInGroup()) {
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if (NI->isGroupLeader()) {
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NodeGroupIterator NGI(Ordering[i]);
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@ -869,7 +885,6 @@ void SimpleSched::EmitAll() {
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} else {
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EmitNode(NI);
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}
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#endif
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}
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}
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@ -1055,228 +1070,89 @@ void SimpleSched::EmitNode(NodeInfo *NI) {
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NI->VRBase = VRBase;
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}
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/// EmitDag - Generate machine code for an operand and needed dependencies.
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///
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unsigned SimpleSched::EmitDAG(SDOperand Op) {
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std::map<SDNode *, unsigned>::iterator OpI = VRMap.lower_bound(Op.Val);
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if (OpI != VRMap.end() && OpI->first == Op.Val)
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return OpI->second + Op.ResNo;
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unsigned &OpSlot = VRMap.insert(OpI, std::make_pair(Op.Val, 0))->second;
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unsigned ResultReg = 0;
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if (Op.isTargetOpcode()) {
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unsigned Opc = Op.getTargetOpcode();
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const TargetInstrDescriptor &II = TII.get(Opc);
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unsigned NumResults = CountResults(Op.Val);
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unsigned NodeOperands = CountOperands(Op.Val);
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unsigned NumMIOperands = NodeOperands + NumResults;
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#ifndef NDEBUG
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assert((unsigned(II.numOperands) == NumMIOperands || II.numOperands == -1)&&
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"#operands for dag node doesn't match .td file!");
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#endif
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// Create the new machine instruction.
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MachineInstr *MI = new MachineInstr(Opc, NumMIOperands, true, true);
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// Add result register values for things that are defined by this
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// instruction.
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if (NumResults) ResultReg = CreateVirtualRegisters(MI, NumResults, II);
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// If there is a token chain operand, emit it first, as a hack to get avoid
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// really bad cases.
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if (Op.getNumOperands() > NodeOperands &&
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Op.getOperand(NodeOperands).getValueType() == MVT::Other) {
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EmitDAG(Op.getOperand(NodeOperands));
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}
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// Emit all of the actual operands of this instruction, adding them to the
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// instruction as appropriate.
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for (unsigned i = 0; i != NodeOperands; ++i) {
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if (Op.getOperand(i).isTargetOpcode()) {
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// Note that this case is redundant with the final else block, but we
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// include it because it is the most common and it makes the logic
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// simpler here.
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assert(Op.getOperand(i).getValueType() != MVT::Other &&
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Op.getOperand(i).getValueType() != MVT::Flag &&
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"Chain and flag operands should occur at end of operand list!");
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unsigned VReg = EmitDAG(Op.getOperand(i));
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MI->addRegOperand(VReg, MachineOperand::Use);
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// Verify that it is right.
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assert(MRegisterInfo::isVirtualRegister(VReg) && "Not a vreg?");
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assert(II.OpInfo[i+NumResults].RegClass &&
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"Don't have operand info for this instruction!");
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#ifndef NDEBUG
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if (RegMap->getRegClass(VReg) != II.OpInfo[i+NumResults].RegClass) {
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std::cerr << "OP: ";
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Op.getOperand(i).Val->dump(&DAG); std::cerr << "\nUSE: ";
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Op.Val->dump(&DAG); std::cerr << "\n";
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}
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#endif
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assert(RegMap->getRegClass(VReg) == II.OpInfo[i+NumResults].RegClass &&
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"Register class of operand and regclass of use don't agree!");
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} else if (ConstantSDNode *C =
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dyn_cast<ConstantSDNode>(Op.getOperand(i))) {
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MI->addZeroExtImm64Operand(C->getValue());
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} else if (RegisterSDNode*R =dyn_cast<RegisterSDNode>(Op.getOperand(i))) {
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MI->addRegOperand(R->getReg(), MachineOperand::Use);
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} else if (GlobalAddressSDNode *TGA =
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dyn_cast<GlobalAddressSDNode>(Op.getOperand(i))) {
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MI->addGlobalAddressOperand(TGA->getGlobal(), false, 0);
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} else if (BasicBlockSDNode *BB =
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dyn_cast<BasicBlockSDNode>(Op.getOperand(i))) {
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MI->addMachineBasicBlockOperand(BB->getBasicBlock());
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} else if (FrameIndexSDNode *FI =
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dyn_cast<FrameIndexSDNode>(Op.getOperand(i))) {
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MI->addFrameIndexOperand(FI->getIndex());
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} else if (ConstantPoolSDNode *CP =
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dyn_cast<ConstantPoolSDNode>(Op.getOperand(i))) {
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unsigned Idx = ConstPool->getConstantPoolIndex(CP->get());
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MI->addConstantPoolIndexOperand(Idx);
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} else if (ExternalSymbolSDNode *ES =
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dyn_cast<ExternalSymbolSDNode>(Op.getOperand(i))) {
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MI->addExternalSymbolOperand(ES->getSymbol(), false);
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} else {
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assert(Op.getOperand(i).getValueType() != MVT::Other &&
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Op.getOperand(i).getValueType() != MVT::Flag &&
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"Chain and flag operands should occur at end of operand list!");
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unsigned VReg = EmitDAG(Op.getOperand(i));
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MI->addRegOperand(VReg, MachineOperand::Use);
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// Verify that it is right.
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assert(MRegisterInfo::isVirtualRegister(VReg) && "Not a vreg?");
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assert(II.OpInfo[i+NumResults].RegClass &&
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"Don't have operand info for this instruction!");
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assert(RegMap->getRegClass(VReg) == II.OpInfo[i+NumResults].RegClass &&
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"Register class of operand and regclass of use don't agree!");
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}
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}
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// Finally, if this node has any flag operands, we *must* emit them last, to
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// avoid emitting operations that might clobber the flags.
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if (Op.getNumOperands() > NodeOperands) {
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unsigned i = NodeOperands;
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if (Op.getOperand(i).getValueType() == MVT::Other)
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++i; // the chain is already selected.
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for (unsigned N = Op.getNumOperands(); i < N; i++) {
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assert(Op.getOperand(i).getValueType() == MVT::Flag &&
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"Must be flag operands!");
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EmitDAG(Op.getOperand(i));
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}
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}
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// Now that we have emitted all operands, emit this instruction itself.
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if ((II.Flags & M_USES_CUSTOM_DAG_SCHED_INSERTION) == 0) {
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BB->insert(BB->end(), MI);
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} else {
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// Insert this instruction into the end of the basic block, potentially
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// taking some custom action.
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BB = DAG.getTargetLoweringInfo().InsertAtEndOfBasicBlock(MI, BB);
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}
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} else {
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switch (Op.getOpcode()) {
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default:
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Op.Val->dump();
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assert(0 && "This target-independent node should have been selected!");
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case ISD::EntryToken: break;
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case ISD::TokenFactor:
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for (unsigned i = 0, N = Op.getNumOperands(); i < N; i++) {
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EmitDAG(Op.getOperand(i));
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}
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break;
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case ISD::CopyToReg: {
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SDOperand FlagOp; FlagOp.ResNo = 0;
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if (Op.getNumOperands() == 4) {
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FlagOp = Op.getOperand(3);
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}
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if (Op.getOperand(0).Val != FlagOp.Val) {
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EmitDAG(Op.getOperand(0)); // Emit the chain.
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}
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unsigned Val = EmitDAG(Op.getOperand(2));
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if (FlagOp.Val) {
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EmitDAG(FlagOp);
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}
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MRI.copyRegToReg(*BB, BB->end(),
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cast<RegisterSDNode>(Op.getOperand(1))->getReg(), Val,
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RegMap->getRegClass(Val));
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break;
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}
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case ISD::CopyFromReg: {
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EmitDAG(Op.getOperand(0)); // Emit the chain.
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unsigned SrcReg = cast<RegisterSDNode>(Op.getOperand(1))->getReg();
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// If the input is already a virtual register, just use it.
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if (MRegisterInfo::isVirtualRegister(SrcReg)) {
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ResultReg = SrcReg;
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break;
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}
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// Figure out the register class to create for the destreg.
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const TargetRegisterClass *TRC = 0;
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// Pick the register class of the right type that contains this physreg.
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for (MRegisterInfo::regclass_iterator I = MRI.regclass_begin(),
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E = MRI.regclass_end(); I != E; ++I)
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if ((*I)->getType() == Op.Val->getValueType(0) &&
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(*I)->contains(SrcReg)) {
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TRC = *I;
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break;
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}
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assert(TRC && "Couldn't find register class for reg copy!");
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// Create the reg, emit the copy.
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ResultReg = RegMap->createVirtualRegister(TRC);
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MRI.copyRegToReg(*BB, BB->end(), ResultReg, SrcReg, TRC);
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break;
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}
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}
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}
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OpSlot = ResultReg;
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return ResultReg+Op.ResNo;
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}
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/// Schedule - Order nodes according to selected style.
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///
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void SimpleSched::Schedule() {
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switch (ScheduleStyle) {
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case simpleScheduling:
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// Number the nodes
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NodeCount = DAG.allnodes_size();
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// Don't waste time if is only entry and return
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if (NodeCount > 3) {
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// Get latency and resource requirements
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GatherNodeInfo();
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// Breadth first walk of DAG
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VisitAll();
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DEBUG(dump("Pre-"));
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// Push back long instructions and critical path
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ScheduleBackward();
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DEBUG(dump("Mid-"));
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// Pack instructions to maximize resource utilization
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ScheduleForward();
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DEBUG(dump("Post-"));
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// Emit in scheduled order
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EmitAll();
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break;
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} // fall thru
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case noScheduling:
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// Emit instructions in using a DFS from the exit root
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EmitDAG(DAG.getRoot());
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break;
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// Number the nodes
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NodeCount = DAG.allnodes_size();
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// Set up minimum info for scheduling.
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PrepareNodeInfo();
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// Construct node groups for flagged nodes
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IdentifyGroups();
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// Breadth first walk of DAG
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VisitAll();
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#ifndef NDEBUG
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static unsigned Count = 0;
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Count++;
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for (unsigned i = 0, N = Ordering.size(); i < N; i++) {
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NodeInfo *NI = Ordering[i];
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NI->Preorder = i;
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}
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#endif
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// Don't waste time if is only entry and return
|
||||
if (NodeCount > 3 && ScheduleStyle != noScheduling) {
|
||||
// Get latency and resource requirements
|
||||
GatherSchedulingInfo();
|
||||
|
||||
// Push back long instructions and critical path
|
||||
ScheduleBackward();
|
||||
|
||||
// Pack instructions to maximize resource utilization
|
||||
ScheduleForward();
|
||||
}
|
||||
|
||||
DEBUG(printChanges(Count));
|
||||
|
||||
// Emit in scheduled order
|
||||
EmitAll();
|
||||
}
|
||||
|
||||
/// printChanges - Hilight changes in order caused by scheduling.
|
||||
///
|
||||
void SimpleSched::printChanges(unsigned Index) {
|
||||
#ifndef NDEBUG
|
||||
// Get the ordered node count
|
||||
unsigned N = Ordering.size();
|
||||
// Determine if any changes
|
||||
unsigned i = 0;
|
||||
for (; i < N; i++) {
|
||||
NodeInfo *NI = Ordering[i];
|
||||
if (NI->Preorder != i) break;
|
||||
}
|
||||
|
||||
if (i < N) {
|
||||
std::cerr << Index << ". New Ordering\n";
|
||||
|
||||
for (i = 0; i < N; i++) {
|
||||
NodeInfo *NI = Ordering[i];
|
||||
std::cerr << " " << NI->Preorder << ". ";
|
||||
printSI(std::cerr, NI);
|
||||
std::cerr << "\n";
|
||||
if (NI->isGroupLeader()) {
|
||||
NodeGroup *Group = NI->Group;
|
||||
for (NIIterator NII = Group->begin(), E = Group->end();
|
||||
NII != E; NII++) {
|
||||
std::cerr << " ";
|
||||
printSI(std::cerr, *NII);
|
||||
std::cerr << "\n";
|
||||
}
|
||||
}
|
||||
}
|
||||
} else {
|
||||
std::cerr << Index << ". No Changes\n";
|
||||
}
|
||||
#endif
|
||||
}
|
||||
|
||||
/// printSI - Print schedule info.
|
||||
///
|
||||
void SimpleSched::printSI(std::ostream &O, NodeInfo *NI) const {
|
||||
#ifndef NDEBUG
|
||||
using namespace std;
|
||||
SDNode *Node = NI->Node;
|
||||
O << " "
|
||||
<< hex << Node
|
||||
<< std::hex << Node << std::dec
|
||||
<< ", RS=" << NI->ResourceSet
|
||||
<< ", Lat=" << NI->Latency
|
||||
<< ", Slot=" << NI->Slot
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user