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@@ -29,19 +29,19 @@ using namespace llvm;
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// State represents the usage of machine resources if the packet contains
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// a set of instruction classes.
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//
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-// Specifically, currentState is a set of bit-masks
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+// Specifically, currentState is a set of bit-masks.
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// The nth bit in a bit-mask indicates whether the nth resource is being used
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// by this state. The set of bit-masks in a state represent the different
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// possible outcomes of transitioning to this state.
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-// For example: Consider a two resource architecture: Resource L and Resource M
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-// with three instruction classes: L, M, and L_or_M
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+// For example: consider a two resource architecture: resource L and resource M
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+// with three instruction classes: L, M, and L_or_M.
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// From the initial state (currentState = 0x00), if we add instruction class
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// L_or_M we will transition to a state with currentState = [0x01, 0x10]. This
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// represents the possible resource states that can result from adding a L_or_M
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// instruction
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//
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// Another way of thinking about this transition is we are mapping a NDFA with
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-// two states [0x01] and [0x10] into a DFA with a single state [0x01, 0x10]
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+// two states [0x01] and [0x10] into a DFA with a single state [0x01, 0x10].
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//
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//
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namespace {
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@@ -57,15 +57,15 @@ class State {
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//
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// canAddInsnClass - Returns true if an instruction of type InsnClass is a
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- // valid transition from this state i.e., can an instruction of type InsnClass
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- // be added to the packet represented by this state
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+ // valid transition from this state, i.e., can an instruction of type InsnClass
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+ // be added to the packet represented by this state.
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//
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// PossibleStates is the set of valid resource states that ensue from valid
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- // transitions
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+ // transitions.
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//
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bool canAddInsnClass(unsigned InsnClass, std::set<unsigned>& PossibleStates);
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};
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-} // End anonymous namespace
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+} // End anonymous namespace.
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namespace {
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@@ -79,39 +79,39 @@ struct Transition {
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Transition(State* from_, unsigned input_, State* to_);
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};
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-} // End anonymous namespace
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+} // End anonymous namespace.
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//
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-// Comparators to keep set of states sorted
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+// Comparators to keep set of states sorted.
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//
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namespace {
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struct ltState {
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bool operator()(const State* s1, const State* s2) const;
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};
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-} // End anonymous namespace
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+} // End anonymous namespace.
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//
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-// class DFA: deterministic finite automaton for processor resource tracking
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+// class DFA: deterministic finite automaton for processor resource tracking.
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//
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namespace {
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class DFA {
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public:
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DFA();
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- // Set of states. Need to keep this sorted to emit the transition table
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+ // Set of states. Need to keep this sorted to emit the transition table.
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std::set<State*, ltState> states;
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- // Map from a state to the list of transitions with that state as source
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+ // Map from a state to the list of transitions with that state as source.
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std::map<State*, SmallVector<Transition*, 16>, ltState> stateTransitions;
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State* currentState;
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- // Highest valued Input seen
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+ // Highest valued Input seen.
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unsigned LargestInput;
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//
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- // Modify the DFA
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+ // Modify the DFA.
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//
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void initialize();
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void addState(State*);
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@@ -119,22 +119,22 @@ public:
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//
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// getTransition - Return the state when a transition is made from
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- // State From with Input I. If a transition is not found, return NULL
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+ // State From with Input I. If a transition is not found, return NULL.
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//
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State* getTransition(State*, unsigned);
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//
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// isValidTransition: Predicate that checks if there is a valid transition
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- // from state From on input InsnClass
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+ // from state From on input InsnClass.
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//
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bool isValidTransition(State* From, unsigned InsnClass);
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//
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- // writeTable: Print out a table representing the DFA
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+ // writeTable: Print out a table representing the DFA.
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//
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void writeTableAndAPI(raw_ostream &OS, const std::string& ClassName);
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};
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-} // End anonymous namespace
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+} // End anonymous namespace.
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//
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@@ -166,15 +166,15 @@ bool ltState::operator()(const State* s1, const State* s2) const {
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//
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// canAddInsnClass - Returns true if an instruction of type InsnClass is a
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// valid transition from this state i.e., can an instruction of type InsnClass
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-// be added to the packet represented by this state
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+// be added to the packet represented by this state.
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//
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// PossibleStates is the set of valid resource states that ensue from valid
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-// transitions
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+// transitions.
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//
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bool State::canAddInsnClass(unsigned InsnClass,
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std::set<unsigned>& PossibleStates) {
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//
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- // Iterate over all resource states in currentState
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+ // Iterate over all resource states in currentState.
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//
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bool AddedState = false;
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@@ -183,8 +183,8 @@ bool State::canAddInsnClass(unsigned InsnClass,
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unsigned thisState = *SI;
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//
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- // Iterate over all possible resources used in InsnClass
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- // For ex: for InsnClass = 0x11, all resources = {0x01, 0x10}
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+ // Iterate over all possible resources used in InsnClass.
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+ // For ex: for InsnClass = 0x11, all resources = {0x01, 0x10}.
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//
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DenseSet<unsigned> VisitedResourceStates;
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@@ -192,18 +192,18 @@ bool State::canAddInsnClass(unsigned InsnClass,
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if ((0x1 << j) & InsnClass) {
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//
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// For each possible resource used in InsnClass, generate the
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- // resource state if that resource was used
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+ // resource state if that resource was used.
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//
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unsigned ResultingResourceState = thisState | (0x1 << j);
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//
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// Check if the resulting resource state can be accommodated in this
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- // packet
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- // We compute ResultingResourceState OR thisState
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+ // packet.
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+ // We compute ResultingResourceState OR thisState.
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// If the result of the OR is different than thisState, it implies
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// that there is at least one resource that can be used to schedule
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- // InsnClass in the current packet
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+ // InsnClass in the current packet.
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// Insert ResultingResourceState into PossibleStates only if we haven't
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- // processed ResultingResourceState before
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+ // processed ResultingResourceState before.
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//
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if ((ResultingResourceState != thisState) &&
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(VisitedResourceStates.count(ResultingResourceState) == 0)) {
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@@ -231,18 +231,18 @@ void DFA::addState(State* S) {
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void DFA::addTransition(Transition* T) {
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- // Update LargestInput
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+ // Update LargestInput.
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if (T->input > LargestInput)
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LargestInput = T->input;
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- // Add the new transition
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+ // Add the new transition.
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stateTransitions[T->from].push_back(T);
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}
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//
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// getTransition - Return the state when a transition is made from
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-// State From with Input I. If a transition is not found, return NULL
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+// State From with Input I. If a transition is not found, return NULL.
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//
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State* DFA::getTransition(State* From, unsigned I) {
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// Do we have a transition from state From?
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@@ -275,26 +275,26 @@ DFAGen::DFAGen(RecordKeeper& R):
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//
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// writeTableAndAPI - Print out a table representing the DFA and the
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-// associated API to create a DFA packetizer
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+// associated API to create a DFA packetizer.
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//
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// Format:
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// DFAStateInputTable[][2] = pairs of <Input, Transition> for all valid
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-// transitions
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+// transitions.
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// DFAStateEntryTable[i] = Index of the first entry in DFAStateInputTable for
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-// the ith state
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+// the ith state.
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//
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//
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void DFA::writeTableAndAPI(raw_ostream &OS, const std::string& TargetName) {
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std::set<State*, ltState>::iterator SI = states.begin();
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// This table provides a map to the beginning of the transitions for State s
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- // in DFAStateInputTable i.e.,
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+ // in DFAStateInputTable.
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std::vector<int> StateEntry(states.size());
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OS << "namespace llvm {\n\n";
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OS << "const int " << TargetName << "DFAStateInputTable[][2] = {\n";
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// Tracks the total valid transitions encountered so far. It is used
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- // to construct the StateEntry table
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+ // to construct the StateEntry table.
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int ValidTransitions = 0;
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for (unsigned i = 0; i < states.size(); ++i, ++SI) {
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StateEntry[i] = ValidTransitions;
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@@ -309,8 +309,8 @@ void DFA::writeTableAndAPI(raw_ostream &OS, const std::string& TargetName) {
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++ValidTransitions;
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}
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- /* If there are no valid transitions from this stage, we need a sentinel
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- transition */
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+ // If there are no valid transitions from this stage, we need a sentinel
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+ // transition.
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if (ValidTransitions == StateEntry[i])
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OS << "{-1, -1},";
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@@ -320,7 +320,7 @@ void DFA::writeTableAndAPI(raw_ostream &OS, const std::string& TargetName) {
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OS << "const unsigned int " << TargetName << "DFAStateEntryTable[] = {\n";
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// Multiply i by 2 since each entry in DFAStateInputTable is a set of
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- // two numbers
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+ // two numbers.
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for (unsigned i = 0; i < states.size(); ++i)
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OS << StateEntry[i] << ", ";
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@@ -329,7 +329,7 @@ void DFA::writeTableAndAPI(raw_ostream &OS, const std::string& TargetName) {
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//
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- // Emit DFA Packetizer tables if the target is a VLIW machine
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+ // Emit DFA Packetizer tables if the target is a VLIW machine.
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//
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std::string SubTargetClassName = TargetName + "GenSubtargetInfo";
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OS << "\n" << "#include \"llvm/CodeGen/DFAPacketizer.h\"\n";
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@@ -350,11 +350,11 @@ void DFAGen::collectAllInsnClasses(const std::string &Name,
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Record *ItinData,
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unsigned &NStages,
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raw_ostream &OS) {
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- // Collect processor itineraries
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+ // Collect processor itineraries.
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std::vector<Record*> ProcItinList =
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- Records.getAllDerivedDefinitions("ProcessorItineraries");
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+ Records.getAllDerivedDefinitions("ProcessorItineraries");
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- // If just no itinerary then don't bother
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+ // If just no itinerary then don't bother.
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if (ProcItinList.size() < 2)
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return;
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std::map<std::string, unsigned> NameToBitsMap;
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@@ -364,7 +364,7 @@ void DFAGen::collectAllInsnClasses(const std::string &Name,
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Record *Proc = ProcItinList[i];
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std::vector<Record*> FUs = Proc->getValueAsListOfDefs("FU");
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- // Convert macros to bits for each stage
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+ // Convert macros to bits for each stage.
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for (unsigned i = 0, N = FUs.size(); i < N; ++i)
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NameToBitsMap[FUs[i]->getName()] = (unsigned) (1U << i);
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}
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@@ -372,22 +372,22 @@ void DFAGen::collectAllInsnClasses(const std::string &Name,
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const std::vector<Record*> &StageList =
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ItinData->getValueAsListOfDefs("Stages");
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- // The number of stages
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+ // The number of stages.
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NStages = StageList.size();
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- // For each unit
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+ // For each unit.
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unsigned UnitBitValue = 0;
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- // Compute the bitwise or of each unit used in this stage
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+ // Compute the bitwise or of each unit used in this stage.
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for (unsigned i = 0; i < NStages; ++i) {
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const Record *Stage = StageList[i];
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- // Get unit list
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+ // Get unit list.
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const std::vector<Record*> &UnitList =
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Stage->getValueAsListOfDefs("Units");
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for (unsigned j = 0, M = UnitList.size(); j < M; ++j) {
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- // Conduct bitwise or
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+ // Conduct bitwise or.
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std::string UnitName = UnitList[j]->getName();
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assert(NameToBitsMap.count(UnitName));
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UnitBitValue |= NameToBitsMap[UnitName];
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@@ -400,38 +400,38 @@ void DFAGen::collectAllInsnClasses(const std::string &Name,
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//
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-// Run the worklist algorithm to generate the DFA
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+// Run the worklist algorithm to generate the DFA.
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//
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void DFAGen::run(raw_ostream &OS) {
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EmitSourceFileHeader("Target DFA Packetizer Tables", OS);
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- // Collect processor iteraries
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+ // Collect processor iteraries.
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std::vector<Record*> ProcItinList =
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Records.getAllDerivedDefinitions("ProcessorItineraries");
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//
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- // Collect the instruction classes
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+ // Collect the instruction classes.
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//
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for (unsigned i = 0, N = ProcItinList.size(); i < N; i++) {
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Record *Proc = ProcItinList[i];
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- // Get processor itinerary name
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+ // Get processor itinerary name.
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const std::string &Name = Proc->getName();
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- // Skip default
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+ // Skip default.
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if (Name == "NoItineraries")
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continue;
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- // Sanity check for at least one instruction itinerary class
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+ // Sanity check for at least one instruction itinerary class.
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unsigned NItinClasses =
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Records.getAllDerivedDefinitions("InstrItinClass").size();
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if (NItinClasses == 0)
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return;
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- // Get itinerary data list
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+ // Get itinerary data list.
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std::vector<Record*> ItinDataList = Proc->getValueAsListOfDefs("IID");
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- // Collect instruction classes for all itinerary data
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+ // Collect instruction classes for all itinerary data.
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for (unsigned j = 0, M = ItinDataList.size(); j < M; j++) {
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Record *ItinData = ItinDataList[j];
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unsigned NStages;
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@@ -441,7 +441,7 @@ void DFAGen::run(raw_ostream &OS) {
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//
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- // Run a worklist algorithm to generate the DFA
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+ // Run a worklist algorithm to generate the DFA.
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//
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DFA D;
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State* Initial = new State;
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@@ -454,7 +454,7 @@ void DFAGen::run(raw_ostream &OS) {
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WorkList.push_back(Initial);
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//
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- // Worklist algorithm to create a DFA for processor resource tracking
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+ // Worklist algorithm to create a DFA for processor resource tracking.
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// C = {set of InsnClasses}
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// Begin with initial node in worklist. Initial node does not have
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// any consumed resources,
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@@ -479,14 +479,14 @@ void DFAGen::run(raw_ostream &OS) {
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std::set<unsigned> NewStateResources;
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//
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// If we haven't already created a transition for this input
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- // and the state can accommodate this InsnClass, create a transition
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+ // and the state can accommodate this InsnClass, create a transition.
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//
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if (!D.getTransition(current, InsnClass) &&
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current->canAddInsnClass(InsnClass, NewStateResources)) {
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State* NewState = NULL;
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//
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- // If we have seen this state before, then do not create a new state
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+ // If we have seen this state before, then do not create a new state.
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//
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//
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std::map<std::set<unsigned>, State*>::iterator VI;
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@@ -507,6 +507,6 @@ void DFAGen::run(raw_ostream &OS) {
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}
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}
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- // Print out the table
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+ // Print out the table.
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D.writeTableAndAPI(OS, TargetName);
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}
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