//===----------------------------------------------------------------------===//
#include "LegalizeTypes.h"
-#include "llvm/Constants.h"
-#include "llvm/DerivedTypes.h"
+#include "llvm/CallingConv.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/ADT/SetVector.h"
#include "llvm/Support/CommandLine.h"
-#include "llvm/Support/MathExtras.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/raw_ostream.h"
using namespace llvm;
-#ifndef NDEBUG
static cl::opt<bool>
-ViewLegalizeTypesDAGs("view-legalize-types-dags", cl::Hidden,
- cl::desc("Pop up a window to show dags before legalize types"));
-#else
-static const bool ViewLegalizeTypesDAGs = 0;
-#endif
+EnableExpensiveChecks("enable-legalize-types-checking", cl::Hidden);
+
+/// PerformExpensiveChecks - Do extensive, expensive, sanity checking.
+void DAGTypeLegalizer::PerformExpensiveChecks() {
+ // If a node is not processed, then none of its values should be mapped by any
+ // of PromotedIntegers, ExpandedIntegers, ..., ReplacedValues.
+
+ // If a node is processed, then each value with an illegal type must be mapped
+ // by exactly one of PromotedIntegers, ExpandedIntegers, ..., ReplacedValues.
+ // Values with a legal type may be mapped by ReplacedValues, but not by any of
+ // the other maps.
+
+ // Note that these invariants may not hold momentarily when processing a node:
+ // the node being processed may be put in a map before being marked Processed.
+
+ // Note that it is possible to have nodes marked NewNode in the DAG. This can
+ // occur in two ways. Firstly, a node may be created during legalization but
+ // never passed to the legalization core. This is usually due to the implicit
+ // folding that occurs when using the DAG.getNode operators. Secondly, a new
+ // node may be passed to the legalization core, but when analyzed may morph
+ // into a different node, leaving the original node as a NewNode in the DAG.
+ // A node may morph if one of its operands changes during analysis. Whether
+ // it actually morphs or not depends on whether, after updating its operands,
+ // it is equivalent to an existing node: if so, it morphs into that existing
+ // node (CSE). An operand can change during analysis if the operand is a new
+ // node that morphs, or it is a processed value that was mapped to some other
+ // value (as recorded in ReplacedValues) in which case the operand is turned
+ // into that other value. If a node morphs then the node it morphed into will
+ // be used instead of it for legalization, however the original node continues
+ // to live on in the DAG.
+ // The conclusion is that though there may be nodes marked NewNode in the DAG,
+ // all uses of such nodes are also marked NewNode: the result is a fungus of
+ // NewNodes growing on top of the useful nodes, and perhaps using them, but
+ // not used by them.
+
+ // If a value is mapped by ReplacedValues, then it must have no uses, except
+ // by nodes marked NewNode (see above).
+
+ // The final node obtained by mapping by ReplacedValues is not marked NewNode.
+ // Note that ReplacedValues should be applied iteratively.
+
+ // Note that the ReplacedValues map may also map deleted nodes (by iterating
+ // over the DAG we never dereference deleted nodes). This means that it may
+ // also map nodes marked NewNode if the deallocated memory was reallocated as
+ // another node, and that new node was not seen by the LegalizeTypes machinery
+ // (for example because it was created but not used). In general, we cannot
+ // distinguish between new nodes and deleted nodes.
+ SmallVector<SDNode*, 16> NewNodes;
+ for (SelectionDAG::allnodes_iterator I = DAG.allnodes_begin(),
+ E = DAG.allnodes_end(); I != E; ++I) {
+ // Remember nodes marked NewNode - they are subject to extra checking below.
+ if (I->getNodeId() == NewNode)
+ NewNodes.push_back(I);
+
+ for (unsigned i = 0, e = I->getNumValues(); i != e; ++i) {
+ SDValue Res(I, i);
+ bool Failed = false;
+
+ unsigned Mapped = 0;
+ if (ReplacedValues.find(Res) != ReplacedValues.end()) {
+ Mapped |= 1;
+ // Check that remapped values are only used by nodes marked NewNode.
+ for (SDNode::use_iterator UI = I->use_begin(), UE = I->use_end();
+ UI != UE; ++UI)
+ if (UI.getUse().getResNo() == i)
+ assert(UI->getNodeId() == NewNode &&
+ "Remapped value has non-trivial use!");
+
+ // Check that the final result of applying ReplacedValues is not
+ // marked NewNode.
+ SDValue NewVal = ReplacedValues[Res];
+ DenseMap<SDValue, SDValue>::iterator I = ReplacedValues.find(NewVal);
+ while (I != ReplacedValues.end()) {
+ NewVal = I->second;
+ I = ReplacedValues.find(NewVal);
+ }
+ assert(NewVal.getNode()->getNodeId() != NewNode &&
+ "ReplacedValues maps to a new node!");
+ }
+ if (PromotedIntegers.find(Res) != PromotedIntegers.end())
+ Mapped |= 2;
+ if (SoftenedFloats.find(Res) != SoftenedFloats.end())
+ Mapped |= 4;
+ if (ScalarizedVectors.find(Res) != ScalarizedVectors.end())
+ Mapped |= 8;
+ if (ExpandedIntegers.find(Res) != ExpandedIntegers.end())
+ Mapped |= 16;
+ if (ExpandedFloats.find(Res) != ExpandedFloats.end())
+ Mapped |= 32;
+ if (SplitVectors.find(Res) != SplitVectors.end())
+ Mapped |= 64;
+ if (WidenedVectors.find(Res) != WidenedVectors.end())
+ Mapped |= 128;
+
+ if (I->getNodeId() != Processed) {
+ // Since we allow ReplacedValues to map deleted nodes, it may map nodes
+ // marked NewNode too, since a deleted node may have been reallocated as
+ // another node that has not been seen by the LegalizeTypes machinery.
+ if ((I->getNodeId() == NewNode && Mapped > 1) ||
+ (I->getNodeId() != NewNode && Mapped != 0)) {
+ dbgs() << "Unprocessed value in a map!";
+ Failed = true;
+ }
+ } else if (isTypeLegal(Res.getValueType()) || IgnoreNodeResults(I)) {
+ if (Mapped > 1) {
+ dbgs() << "Value with legal type was transformed!";
+ Failed = true;
+ }
+ } else {
+ if (Mapped == 0) {
+ dbgs() << "Processed value not in any map!";
+ Failed = true;
+ } else if (Mapped & (Mapped - 1)) {
+ dbgs() << "Value in multiple maps!";
+ Failed = true;
+ }
+ }
+ if (Failed) {
+ if (Mapped & 1)
+ dbgs() << " ReplacedValues";
+ if (Mapped & 2)
+ dbgs() << " PromotedIntegers";
+ if (Mapped & 4)
+ dbgs() << " SoftenedFloats";
+ if (Mapped & 8)
+ dbgs() << " ScalarizedVectors";
+ if (Mapped & 16)
+ dbgs() << " ExpandedIntegers";
+ if (Mapped & 32)
+ dbgs() << " ExpandedFloats";
+ if (Mapped & 64)
+ dbgs() << " SplitVectors";
+ if (Mapped & 128)
+ dbgs() << " WidenedVectors";
+ dbgs() << "\n";
+ llvm_unreachable(0);
+ }
+ }
+ }
+ // Checked that NewNodes are only used by other NewNodes.
+ for (unsigned i = 0, e = NewNodes.size(); i != e; ++i) {
+ SDNode *N = NewNodes[i];
+ for (SDNode::use_iterator UI = N->use_begin(), UE = N->use_end();
+ UI != UE; ++UI)
+ assert(UI->getNodeId() == NewNode && "NewNode used by non-NewNode!");
+ }
+}
/// run - This is the main entry point for the type legalizer. This does a
-/// top-down traversal of the dag, legalizing types as it goes.
-void DAGTypeLegalizer::run() {
+/// top-down traversal of the dag, legalizing types as it goes. Returns "true"
+/// if it made any changes.
+bool DAGTypeLegalizer::run() {
+ bool Changed = false;
+
// Create a dummy node (which is not added to allnodes), that adds a reference
// to the root node, preventing it from being deleted, and tracking any
// changes of the root.
HandleSDNode Dummy(DAG.getRoot());
+ Dummy.setNodeId(Unanalyzed);
// The root of the dag may dangle to deleted nodes until the type legalizer is
// done. Set it to null to avoid confusion.
- DAG.setRoot(SDOperand());
-
- // Walk all nodes in the graph, assigning them a NodeID of 'ReadyToProcess'
- // (and remembering them) if they are leaves and assigning 'NewNode' if
+ DAG.setRoot(SDValue());
+
+ // Walk all nodes in the graph, assigning them a NodeId of 'ReadyToProcess'
+ // (and remembering them) if they are leaves and assigning 'Unanalyzed' if
// non-leaves.
for (SelectionDAG::allnodes_iterator I = DAG.allnodes_begin(),
E = DAG.allnodes_end(); I != E; ++I) {
I->setNodeId(ReadyToProcess);
Worklist.push_back(I);
} else {
- I->setNodeId(NewNode);
+ I->setNodeId(Unanalyzed);
}
}
-
+
// Now that we have a set of nodes to process, handle them all.
while (!Worklist.empty()) {
+#ifndef XDEBUG
+ if (EnableExpensiveChecks)
+#endif
+ PerformExpensiveChecks();
+
SDNode *N = Worklist.back();
Worklist.pop_back();
assert(N->getNodeId() == ReadyToProcess &&
"Node should be ready if on worklist!");
-
+
+ if (IgnoreNodeResults(N))
+ goto ScanOperands;
+
// Scan the values produced by the node, checking to see if any result
// types are illegal.
- unsigned i = 0;
- unsigned NumResults = N->getNumValues();
- do {
- MVT::ValueType ResultVT = N->getValueType(i);
- LegalizeAction Action = getTypeAction(ResultVT);
- if (Action == Promote) {
- PromoteResult(N, i);
+ for (unsigned i = 0, NumResults = N->getNumValues(); i < NumResults; ++i) {
+ EVT ResultVT = N->getValueType(i);
+ switch (getTypeAction(ResultVT)) {
+ default:
+ assert(false && "Unknown action!");
+ case TargetLowering::TypeLegal:
+ break;
+ // The following calls must take care of *all* of the node's results,
+ // not just the illegal result they were passed (this includes results
+ // with a legal type). Results can be remapped using ReplaceValueWith,
+ // or their promoted/expanded/etc values registered in PromotedIntegers,
+ // ExpandedIntegers etc.
+ case TargetLowering::TypePromoteInteger:
+ PromoteIntegerResult(N, i);
+ Changed = true;
goto NodeDone;
- } else if (Action == Expand) {
- // Expand can mean 1) split integer in half 2) scalarize single-element
- // vector 3) split vector in half.
- if (!MVT::isVector(ResultVT))
- ExpandResult(N, i);
- else if (MVT::getVectorNumElements(ResultVT) == 1)
- ScalarizeResult(N, i); // Scalarize the single-element vector.
- else
- SplitResult(N, i); // Split the vector in half.
+ case TargetLowering::TypeExpandInteger:
+ ExpandIntegerResult(N, i);
+ Changed = true;
+ goto NodeDone;
+ case TargetLowering::TypeSoftenFloat:
+ SoftenFloatResult(N, i);
+ Changed = true;
+ goto NodeDone;
+ case TargetLowering::TypeExpandFloat:
+ ExpandFloatResult(N, i);
+ Changed = true;
+ goto NodeDone;
+ case TargetLowering::TypeScalarizeVector:
+ ScalarizeVectorResult(N, i);
+ Changed = true;
+ goto NodeDone;
+ case TargetLowering::TypeSplitVector:
+ SplitVectorResult(N, i);
+ Changed = true;
+ goto NodeDone;
+ case TargetLowering::TypeWidenVector:
+ WidenVectorResult(N, i);
+ Changed = true;
goto NodeDone;
- } else {
- assert(Action == Legal && "Unknown action!");
}
- } while (++i < NumResults);
-
+ }
+
+ScanOperands:
// Scan the operand list for the node, handling any nodes with operands that
// are illegal.
{
unsigned NumOperands = N->getNumOperands();
- bool NeedsRevisit = false;
+ bool NeedsReanalyzing = false;
+ unsigned i;
for (i = 0; i != NumOperands; ++i) {
- MVT::ValueType OpVT = N->getOperand(i).getValueType();
- LegalizeAction Action = getTypeAction(OpVT);
- if (Action == Promote) {
- NeedsRevisit = PromoteOperand(N, i);
+ if (IgnoreNodeResults(N->getOperand(i).getNode()))
+ continue;
+
+ EVT OpVT = N->getOperand(i).getValueType();
+ switch (getTypeAction(OpVT)) {
+ default:
+ assert(false && "Unknown action!");
+ case TargetLowering::TypeLegal:
+ continue;
+ // The following calls must either replace all of the node's results
+ // using ReplaceValueWith, and return "false"; or update the node's
+ // operands in place, and return "true".
+ case TargetLowering::TypePromoteInteger:
+ NeedsReanalyzing = PromoteIntegerOperand(N, i);
+ Changed = true;
break;
- } else if (Action == Expand) {
- // Expand can mean 1) split integer in half 2) scalarize single-element
- // vector 3) split vector in half.
- if (!MVT::isVector(OpVT)) {
- NeedsRevisit = ExpandOperand(N, i);
- } else if (MVT::getVectorNumElements(OpVT) == 1) {
- // Scalarize the single-element vector.
- NeedsRevisit = ScalarizeOperand(N, i);
- } else {
- NeedsRevisit = SplitOperand(N, i); // Split the vector in half.
- }
+ case TargetLowering::TypeExpandInteger:
+ NeedsReanalyzing = ExpandIntegerOperand(N, i);
+ Changed = true;
+ break;
+ case TargetLowering::TypeSoftenFloat:
+ NeedsReanalyzing = SoftenFloatOperand(N, i);
+ Changed = true;
+ break;
+ case TargetLowering::TypeExpandFloat:
+ NeedsReanalyzing = ExpandFloatOperand(N, i);
+ Changed = true;
+ break;
+ case TargetLowering::TypeScalarizeVector:
+ NeedsReanalyzing = ScalarizeVectorOperand(N, i);
+ Changed = true;
+ break;
+ case TargetLowering::TypeSplitVector:
+ NeedsReanalyzing = SplitVectorOperand(N, i);
+ Changed = true;
+ break;
+ case TargetLowering::TypeWidenVector:
+ NeedsReanalyzing = WidenVectorOperand(N, i);
+ Changed = true;
break;
- } else {
- assert(Action == Legal && "Unknown action!");
}
+ break;
}
- // If the node needs revisiting, don't add all users to the worklist etc.
- if (NeedsRevisit)
+ // The sub-method updated N in place. Check to see if any operands are new,
+ // and if so, mark them. If the node needs revisiting, don't add all users
+ // to the worklist etc.
+ if (NeedsReanalyzing) {
+ assert(N->getNodeId() == ReadyToProcess && "Node ID recalculated?");
+ N->setNodeId(NewNode);
+ // Recompute the NodeId and correct processed operands, adding the node to
+ // the worklist if ready.
+ SDNode *M = AnalyzeNewNode(N);
+ if (M == N)
+ // The node didn't morph - nothing special to do, it will be revisited.
+ continue;
+
+ // The node morphed - this is equivalent to legalizing by replacing every
+ // value of N with the corresponding value of M. So do that now.
+ assert(N->getNumValues() == M->getNumValues() &&
+ "Node morphing changed the number of results!");
+ for (unsigned i = 0, e = N->getNumValues(); i != e; ++i)
+ // Replacing the value takes care of remapping the new value.
+ ReplaceValueWith(SDValue(N, i), SDValue(M, i));
+ assert(N->getNodeId() == NewNode && "Unexpected node state!");
+ // The node continues to live on as part of the NewNode fungus that
+ // grows on top of the useful nodes. Nothing more needs to be done
+ // with it - move on to the next node.
continue;
-
- if (i == NumOperands)
- DEBUG(cerr << "Legally typed node: "; N->dump(&DAG); cerr << "\n");
+ }
+
+ if (i == NumOperands) {
+ DEBUG(dbgs() << "Legally typed node: "; N->dump(&DAG); dbgs() << "\n");
+ }
}
NodeDone:
// If we reach here, the node was processed, potentially creating new nodes.
// Mark it as processed and add its users to the worklist as appropriate.
+ assert(N->getNodeId() == ReadyToProcess && "Node ID recalculated?");
N->setNodeId(Processed);
-
+
for (SDNode::use_iterator UI = N->use_begin(), E = N->use_end();
UI != E; ++UI) {
SDNode *User = *UI;
- int NodeID = User->getNodeId();
- assert(NodeID != ReadyToProcess && NodeID != Processed &&
- "Invalid node id for user of unprocessed node!");
-
+ int NodeId = User->getNodeId();
+
// This node has two options: it can either be a new node or its Node ID
// may be a count of the number of operands it has that are not ready.
- if (NodeID > 0) {
- User->setNodeId(NodeID-1);
-
+ if (NodeId > 0) {
+ User->setNodeId(NodeId-1);
+
// If this was the last use it was waiting on, add it to the ready list.
- if (NodeID-1 == ReadyToProcess)
+ if (NodeId-1 == ReadyToProcess)
Worklist.push_back(User);
continue;
}
-
+
+ // If this is an unreachable new node, then ignore it. If it ever becomes
+ // reachable by being used by a newly created node then it will be handled
+ // by AnalyzeNewNode.
+ if (NodeId == NewNode)
+ continue;
+
// Otherwise, this node is new: this is the first operand of it that
- // became ready. Its new NodeID is the number of operands it has minus 1
+ // became ready. Its new NodeId is the number of operands it has minus 1
// (as this node is now processed).
- assert(NodeID == NewNode && "Unknown node ID!");
- User->setNodeId(User->getNumOperands()-1);
-
+ assert(NodeId == Unanalyzed && "Unknown node ID!");
+ User->setNodeId(User->getNumOperands() - 1);
+
// If the node only has a single operand, it is now ready.
if (User->getNumOperands() == 1)
Worklist.push_back(User);
}
}
-
- // If the root changed (e.g. it was a dead load, update the root).
- DAG.setRoot(Dummy.getValue());
- //DAG.viewGraph();
+#ifndef XDEBUG
+ if (EnableExpensiveChecks)
+#endif
+ PerformExpensiveChecks();
+
+ // If the root changed (e.g. it was a dead load) update the root.
+ DAG.setRoot(Dummy.getValue());
// Remove dead nodes. This is important to do for cleanliness but also before
- // the checking loop below. Implicit folding by the DAG.getNode operators can
- // cause unreachable nodes to be around with their flags set to new.
+ // the checking loop below. Implicit folding by the DAG.getNode operators and
+ // node morphing can cause unreachable nodes to be around with their flags set
+ // to new.
DAG.RemoveDeadNodes();
// In a debug build, scan all the nodes to make sure we found them all. This
bool Failed = false;
// Check that all result types are legal.
- for (unsigned i = 0, NumVals = I->getNumValues(); i < NumVals; ++i)
- if (!isTypeLegal(I->getValueType(i))) {
- cerr << "Result type " << i << " illegal!\n";
- Failed = true;
- }
+ if (!IgnoreNodeResults(I))
+ for (unsigned i = 0, NumVals = I->getNumValues(); i < NumVals; ++i)
+ if (!isTypeLegal(I->getValueType(i))) {
+ dbgs() << "Result type " << i << " illegal!\n";
+ Failed = true;
+ }
// Check that all operand types are legal.
for (unsigned i = 0, NumOps = I->getNumOperands(); i < NumOps; ++i)
- if (!isTypeLegal(I->getOperand(i).getValueType())) {
- cerr << "Operand type " << i << " illegal!\n";
+ if (!IgnoreNodeResults(I->getOperand(i).getNode()) &&
+ !isTypeLegal(I->getOperand(i).getValueType())) {
+ dbgs() << "Operand type " << i << " illegal!\n";
Failed = true;
}
if (I->getNodeId() != Processed) {
if (I->getNodeId() == NewNode)
- cerr << "New node not 'noticed'?\n";
+ dbgs() << "New node not analyzed?\n";
+ else if (I->getNodeId() == Unanalyzed)
+ dbgs() << "Unanalyzed node not noticed?\n";
else if (I->getNodeId() > 0)
- cerr << "Operand not processed?\n";
+ dbgs() << "Operand not processed?\n";
else if (I->getNodeId() == ReadyToProcess)
- cerr << "Not added to worklist?\n";
+ dbgs() << "Not added to worklist?\n";
Failed = true;
}
if (Failed) {
- I->dump(&DAG); cerr << "\n";
- abort();
+ I->dump(&DAG); dbgs() << "\n";
+ llvm_unreachable(0);
}
}
#endif
+
+ return Changed;
}
-/// MarkNewNodes - The specified node is the root of a subtree of potentially
-/// new nodes. Add the correct NodeId to mark it.
-void DAGTypeLegalizer::MarkNewNodes(SDNode *N) {
+/// AnalyzeNewNode - The specified node is the root of a subtree of potentially
+/// new nodes. Correct any processed operands (this may change the node) and
+/// calculate the NodeId. If the node itself changes to a processed node, it
+/// is not remapped - the caller needs to take care of this.
+/// Returns the potentially changed node.
+SDNode *DAGTypeLegalizer::AnalyzeNewNode(SDNode *N) {
// If this was an existing node that is already done, we're done.
- if (N->getNodeId() != NewNode)
- return;
+ if (N->getNodeId() != NewNode && N->getNodeId() != Unanalyzed)
+ return N;
+
+ // Remove any stale map entries.
+ ExpungeNode(N);
// Okay, we know that this node is new. Recursively walk all of its operands
// to see if they are new also. The depth of this walk is bounded by the size
//
// As we walk the operands, keep track of the number of nodes that are
// processed. If non-zero, this will become the new nodeid of this node.
+ // Operands may morph when they are analyzed. If so, the node will be
+ // updated after all operands have been analyzed. Since this is rare,
+ // the code tries to minimize overhead in the non-morphing case.
+
+ SmallVector<SDValue, 8> NewOps;
unsigned NumProcessed = 0;
for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
- int OpId = N->getOperand(i).Val->getNodeId();
- if (OpId == NewNode)
- MarkNewNodes(N->getOperand(i).Val);
- else if (OpId == Processed)
+ SDValue OrigOp = N->getOperand(i);
+ SDValue Op = OrigOp;
+
+ AnalyzeNewValue(Op); // Op may morph.
+
+ if (Op.getNode()->getNodeId() == Processed)
++NumProcessed;
+
+ if (!NewOps.empty()) {
+ // Some previous operand changed. Add this one to the list.
+ NewOps.push_back(Op);
+ } else if (Op != OrigOp) {
+ // This is the first operand to change - add all operands so far.
+ NewOps.append(N->op_begin(), N->op_begin() + i);
+ NewOps.push_back(Op);
+ }
+ }
+
+ // Some operands changed - update the node.
+ if (!NewOps.empty()) {
+ SDNode *M = DAG.UpdateNodeOperands(N, &NewOps[0], NewOps.size());
+ if (M != N) {
+ // The node morphed into a different node. Normally for this to happen
+ // the original node would have to be marked NewNode. However this can
+ // in theory momentarily not be the case while ReplaceValueWith is doing
+ // its stuff. Mark the original node NewNode to help sanity checking.
+ N->setNodeId(NewNode);
+ if (M->getNodeId() != NewNode && M->getNodeId() != Unanalyzed)
+ // It morphed into a previously analyzed node - nothing more to do.
+ return M;
+
+ // It morphed into a different new node. Do the equivalent of passing
+ // it to AnalyzeNewNode: expunge it and calculate the NodeId. No need
+ // to remap the operands, since they are the same as the operands we
+ // remapped above.
+ N = M;
+ ExpungeNode(N);
+ }
}
-
- N->setNodeId(N->getNumOperands()-NumProcessed);
+
+ // Calculate the NodeId.
+ N->setNodeId(N->getNumOperands() - NumProcessed);
if (N->getNodeId() == ReadyToProcess)
Worklist.push_back(N);
+
+ return N;
+}
+
+/// AnalyzeNewValue - Call AnalyzeNewNode, updating the node in Val if needed.
+/// If the node changes to a processed node, then remap it.
+void DAGTypeLegalizer::AnalyzeNewValue(SDValue &Val) {
+ Val.setNode(AnalyzeNewNode(Val.getNode()));
+ if (Val.getNode()->getNodeId() == Processed)
+ // We were passed a processed node, or it morphed into one - remap it.
+ RemapValue(Val);
+}
+
+/// ExpungeNode - If N has a bogus mapping in ReplacedValues, eliminate it.
+/// This can occur when a node is deleted then reallocated as a new node -
+/// the mapping in ReplacedValues applies to the deleted node, not the new
+/// one.
+/// The only map that can have a deleted node as a source is ReplacedValues.
+/// Other maps can have deleted nodes as targets, but since their looked-up
+/// values are always immediately remapped using RemapValue, resulting in a
+/// not-deleted node, this is harmless as long as ReplacedValues/RemapValue
+/// always performs correct mappings. In order to keep the mapping correct,
+/// ExpungeNode should be called on any new nodes *before* adding them as
+/// either source or target to ReplacedValues (which typically means calling
+/// Expunge when a new node is first seen, since it may no longer be marked
+/// NewNode by the time it is added to ReplacedValues).
+void DAGTypeLegalizer::ExpungeNode(SDNode *N) {
+ if (N->getNodeId() != NewNode)
+ return;
+
+ // If N is not remapped by ReplacedValues then there is nothing to do.
+ unsigned i, e;
+ for (i = 0, e = N->getNumValues(); i != e; ++i)
+ if (ReplacedValues.find(SDValue(N, i)) != ReplacedValues.end())
+ break;
+
+ if (i == e)
+ return;
+
+ // Remove N from all maps - this is expensive but rare.
+
+ for (DenseMap<SDValue, SDValue>::iterator I = PromotedIntegers.begin(),
+ E = PromotedIntegers.end(); I != E; ++I) {
+ assert(I->first.getNode() != N);
+ RemapValue(I->second);
+ }
+
+ for (DenseMap<SDValue, SDValue>::iterator I = SoftenedFloats.begin(),
+ E = SoftenedFloats.end(); I != E; ++I) {
+ assert(I->first.getNode() != N);
+ RemapValue(I->second);
+ }
+
+ for (DenseMap<SDValue, SDValue>::iterator I = ScalarizedVectors.begin(),
+ E = ScalarizedVectors.end(); I != E; ++I) {
+ assert(I->first.getNode() != N);
+ RemapValue(I->second);
+ }
+
+ for (DenseMap<SDValue, SDValue>::iterator I = WidenedVectors.begin(),
+ E = WidenedVectors.end(); I != E; ++I) {
+ assert(I->first.getNode() != N);
+ RemapValue(I->second);
+ }
+
+ for (DenseMap<SDValue, std::pair<SDValue, SDValue> >::iterator
+ I = ExpandedIntegers.begin(), E = ExpandedIntegers.end(); I != E; ++I){
+ assert(I->first.getNode() != N);
+ RemapValue(I->second.first);
+ RemapValue(I->second.second);
+ }
+
+ for (DenseMap<SDValue, std::pair<SDValue, SDValue> >::iterator
+ I = ExpandedFloats.begin(), E = ExpandedFloats.end(); I != E; ++I) {
+ assert(I->first.getNode() != N);
+ RemapValue(I->second.first);
+ RemapValue(I->second.second);
+ }
+
+ for (DenseMap<SDValue, std::pair<SDValue, SDValue> >::iterator
+ I = SplitVectors.begin(), E = SplitVectors.end(); I != E; ++I) {
+ assert(I->first.getNode() != N);
+ RemapValue(I->second.first);
+ RemapValue(I->second.second);
+ }
+
+ for (DenseMap<SDValue, SDValue>::iterator I = ReplacedValues.begin(),
+ E = ReplacedValues.end(); I != E; ++I)
+ RemapValue(I->second);
+
+ for (unsigned i = 0, e = N->getNumValues(); i != e; ++i)
+ ReplacedValues.erase(SDValue(N, i));
+}
+
+/// RemapValue - If the specified value was already legalized to another value,
+/// replace it by that value.
+void DAGTypeLegalizer::RemapValue(SDValue &N) {
+ DenseMap<SDValue, SDValue>::iterator I = ReplacedValues.find(N);
+ if (I != ReplacedValues.end()) {
+ // Use path compression to speed up future lookups if values get multiply
+ // replaced with other values.
+ RemapValue(I->second);
+ N = I->second;
+ assert(N.getNode()->getNodeId() != NewNode && "Mapped to new node!");
+ }
}
namespace {
/// NodeUpdateListener - This class is a DAGUpdateListener that listens for
/// updates to nodes and recomputes their ready state.
- class VISIBILITY_HIDDEN NodeUpdateListener :
- public SelectionDAG::DAGUpdateListener {
+ class NodeUpdateListener : public SelectionDAG::DAGUpdateListener {
DAGTypeLegalizer &DTL;
+ SmallSetVector<SDNode*, 16> &NodesToAnalyze;
public:
- NodeUpdateListener(DAGTypeLegalizer &dtl) : DTL(dtl) {}
+ explicit NodeUpdateListener(DAGTypeLegalizer &dtl,
+ SmallSetVector<SDNode*, 16> &nta)
+ : DTL(dtl), NodesToAnalyze(nta) {}
- virtual void NodeDeleted(SDNode *N) {
- // Ignore deletes.
- assert(N->getNodeId() != DAGTypeLegalizer::Processed &&
- N->getNodeId() != DAGTypeLegalizer::ReadyToProcess &&
- "RAUW deleted processed node!");
+ virtual void NodeDeleted(SDNode *N, SDNode *E) {
+ assert(N->getNodeId() != DAGTypeLegalizer::ReadyToProcess &&
+ N->getNodeId() != DAGTypeLegalizer::Processed &&
+ "Invalid node ID for RAUW deletion!");
+ // It is possible, though rare, for the deleted node N to occur as a
+ // target in a map, so note the replacement N -> E in ReplacedValues.
+ assert(E && "Node not replaced?");
+ DTL.NoteDeletion(N, E);
+
+ // In theory the deleted node could also have been scheduled for analysis.
+ // So remove it from the set of nodes which will be analyzed.
+ NodesToAnalyze.remove(N);
+
+ // In general nothing needs to be done for E, since it didn't change but
+ // only gained new uses. However N -> E was just added to ReplacedValues,
+ // and the result of a ReplacedValues mapping is not allowed to be marked
+ // NewNode. So if E is marked NewNode, then it needs to be analyzed.
+ if (E->getNodeId() == DAGTypeLegalizer::NewNode)
+ NodesToAnalyze.insert(E);
}
virtual void NodeUpdated(SDNode *N) {
// Node updates can mean pretty much anything. It is possible that an
// operand was set to something already processed (f.e.) in which case
// this node could become ready. Recompute its flags.
- assert(N->getNodeId() != DAGTypeLegalizer::Processed &&
- N->getNodeId() != DAGTypeLegalizer::ReadyToProcess &&
- "RAUW updated processed node!");
- DTL.ReanalyzeNodeFlags(N);
+ assert(N->getNodeId() != DAGTypeLegalizer::ReadyToProcess &&
+ N->getNodeId() != DAGTypeLegalizer::Processed &&
+ "Invalid node ID for RAUW deletion!");
+ N->setNodeId(DAGTypeLegalizer::NewNode);
+ NodesToAnalyze.insert(N);
}
};
}
/// ReplaceValueWith - The specified value was legalized to the specified other
-/// value. If they are different, update the DAG and NodeIDs replacing any uses
-/// of From to use To instead.
-void DAGTypeLegalizer::ReplaceValueWith(SDOperand From, SDOperand To) {
- if (From == To) return;
-
+/// value. Update the DAG and NodeIds replacing any uses of From to use To
+/// instead.
+void DAGTypeLegalizer::ReplaceValueWith(SDValue From, SDValue To) {
+ assert(From.getNode() != To.getNode() && "Potential legalization loop!");
+
// If expansion produced new nodes, make sure they are properly marked.
- if (To.Val->getNodeId() == NewNode)
- MarkNewNodes(To.Val);
-
+ ExpungeNode(From.getNode());
+ AnalyzeNewValue(To); // Expunges To.
+
// Anything that used the old node should now use the new one. Note that this
// can potentially cause recursive merging.
- NodeUpdateListener NUL(*this);
- DAG.ReplaceAllUsesOfValueWith(From, To, &NUL);
+ SmallSetVector<SDNode*, 16> NodesToAnalyze;
+ NodeUpdateListener NUL(*this, NodesToAnalyze);
+ do {
+ DAG.ReplaceAllUsesOfValueWith(From, To, &NUL);
- // The old node may still be present in ExpandedNodes or PromotedNodes.
- // Inform them about the replacement.
- ReplacedNodes[From] = To;
-}
+ // The old node may still be present in a map like ExpandedIntegers or
+ // PromotedIntegers. Inform maps about the replacement.
+ ReplacedValues[From] = To;
-/// ReplaceNodeWith - Replace uses of the 'from' node's results with the 'to'
-/// node's results. The from and to node must define identical result types.
-void DAGTypeLegalizer::ReplaceNodeWith(SDNode *From, SDNode *To) {
- if (From == To) return;
- assert(From->getNumValues() == To->getNumValues() &&
- "Node results don't match");
-
- // If expansion produced new nodes, make sure they are properly marked.
- if (To->getNodeId() == NewNode)
- MarkNewNodes(To);
-
- // Anything that used the old node should now use the new one. Note that this
- // can potentially cause recursive merging.
- NodeUpdateListener NUL(*this);
- DAG.ReplaceAllUsesWith(From, To, &NUL);
-
- // The old node may still be present in ExpandedNodes or PromotedNodes.
- // Inform them about the replacement.
- for (unsigned i = 0, e = From->getNumValues(); i != e; ++i) {
- assert(From->getValueType(i) == To->getValueType(i) &&
- "Node results don't match");
- ReplacedNodes[SDOperand(From, i)] = SDOperand(To, i);
- }
+ // Process the list of nodes that need to be reanalyzed.
+ while (!NodesToAnalyze.empty()) {
+ SDNode *N = NodesToAnalyze.back();
+ NodesToAnalyze.pop_back();
+ if (N->getNodeId() != DAGTypeLegalizer::NewNode)
+ // The node was analyzed while reanalyzing an earlier node - it is safe
+ // to skip. Note that this is not a morphing node - otherwise it would
+ // still be marked NewNode.
+ continue;
+
+ // Analyze the node's operands and recalculate the node ID.
+ SDNode *M = AnalyzeNewNode(N);
+ if (M != N) {
+ // The node morphed into a different node. Make everyone use the new
+ // node instead.
+ assert(M->getNodeId() != NewNode && "Analysis resulted in NewNode!");
+ assert(N->getNumValues() == M->getNumValues() &&
+ "Node morphing changed the number of results!");
+ for (unsigned i = 0, e = N->getNumValues(); i != e; ++i) {
+ SDValue OldVal(N, i);
+ SDValue NewVal(M, i);
+ if (M->getNodeId() == Processed)
+ RemapValue(NewVal);
+ DAG.ReplaceAllUsesOfValueWith(OldVal, NewVal, &NUL);
+ // OldVal may be a target of the ReplacedValues map which was marked
+ // NewNode to force reanalysis because it was updated. Ensure that
+ // anything that ReplacedValues mapped to OldVal will now be mapped
+ // all the way to NewVal.
+ ReplacedValues[OldVal] = NewVal;
+ }
+ // The original node continues to exist in the DAG, marked NewNode.
+ }
+ }
+ // When recursively update nodes with new nodes, it is possible to have
+ // new uses of From due to CSE. If this happens, replace the new uses of
+ // From with To.
+ } while (!From.use_empty());
}
+void DAGTypeLegalizer::SetPromotedInteger(SDValue Op, SDValue Result) {
+ assert(Result.getValueType() ==
+ TLI.getTypeToTransformTo(*DAG.getContext(), Op.getValueType()) &&
+ "Invalid type for promoted integer");
+ AnalyzeNewValue(Result);
-/// RemapNode - If the specified value was already legalized to another value,
-/// replace it by that value.
-void DAGTypeLegalizer::RemapNode(SDOperand &N) {
- DenseMap<SDOperand, SDOperand>::iterator I = ReplacedNodes.find(N);
- if (I != ReplacedNodes.end()) {
- // Use path compression to speed up future lookups if values get multiply
- // replaced with other values.
- RemapNode(I->second);
- N = I->second;
- }
+ SDValue &OpEntry = PromotedIntegers[Op];
+ assert(OpEntry.getNode() == 0 && "Node is already promoted!");
+ OpEntry = Result;
}
-void DAGTypeLegalizer::SetPromotedOp(SDOperand Op, SDOperand Result) {
- if (Result.Val->getNodeId() == NewNode)
- MarkNewNodes(Result.Val);
+void DAGTypeLegalizer::SetSoftenedFloat(SDValue Op, SDValue Result) {
+ assert(Result.getValueType() ==
+ TLI.getTypeToTransformTo(*DAG.getContext(), Op.getValueType()) &&
+ "Invalid type for softened float");
+ AnalyzeNewValue(Result);
- SDOperand &OpEntry = PromotedNodes[Op];
- assert(OpEntry.Val == 0 && "Node is already promoted!");
+ SDValue &OpEntry = SoftenedFloats[Op];
+ assert(OpEntry.getNode() == 0 && "Node is already converted to integer!");
OpEntry = Result;
}
-void DAGTypeLegalizer::SetScalarizedOp(SDOperand Op, SDOperand Result) {
- if (Result.Val->getNodeId() == NewNode)
- MarkNewNodes(Result.Val);
-
- SDOperand &OpEntry = ScalarizedNodes[Op];
- assert(OpEntry.Val == 0 && "Node is already scalarized!");
+void DAGTypeLegalizer::SetScalarizedVector(SDValue Op, SDValue Result) {
+ assert(Result.getValueType() == Op.getValueType().getVectorElementType() &&
+ "Invalid type for scalarized vector");
+ AnalyzeNewValue(Result);
+
+ SDValue &OpEntry = ScalarizedVectors[Op];
+ assert(OpEntry.getNode() == 0 && "Node is already scalarized!");
OpEntry = Result;
}
-
-void DAGTypeLegalizer::GetExpandedOp(SDOperand Op, SDOperand &Lo,
- SDOperand &Hi) {
- std::pair<SDOperand, SDOperand> &Entry = ExpandedNodes[Op];
- RemapNode(Entry.first);
- RemapNode(Entry.second);
- assert(Entry.first.Val && "Operand isn't expanded");
+void DAGTypeLegalizer::GetExpandedInteger(SDValue Op, SDValue &Lo,
+ SDValue &Hi) {
+ std::pair<SDValue, SDValue> &Entry = ExpandedIntegers[Op];
+ RemapValue(Entry.first);
+ RemapValue(Entry.second);
+ assert(Entry.first.getNode() && "Operand isn't expanded");
Lo = Entry.first;
Hi = Entry.second;
}
-void DAGTypeLegalizer::SetExpandedOp(SDOperand Op, SDOperand Lo, SDOperand Hi) {
+void DAGTypeLegalizer::SetExpandedInteger(SDValue Op, SDValue Lo,
+ SDValue Hi) {
+ assert(Lo.getValueType() ==
+ TLI.getTypeToTransformTo(*DAG.getContext(), Op.getValueType()) &&
+ Hi.getValueType() == Lo.getValueType() &&
+ "Invalid type for expanded integer");
+ // Lo/Hi may have been newly allocated, if so, add nodeid's as relevant.
+ AnalyzeNewValue(Lo);
+ AnalyzeNewValue(Hi);
+
// Remember that this is the result of the node.
- std::pair<SDOperand, SDOperand> &Entry = ExpandedNodes[Op];
- assert(Entry.first.Val == 0 && "Node already expanded");
+ std::pair<SDValue, SDValue> &Entry = ExpandedIntegers[Op];
+ assert(Entry.first.getNode() == 0 && "Node already expanded");
Entry.first = Lo;
Entry.second = Hi;
-
- // Lo/Hi may have been newly allocated, if so, add nodeid's as relevant.
- if (Lo.Val->getNodeId() == NewNode)
- MarkNewNodes(Lo.Val);
- if (Hi.Val->getNodeId() == NewNode)
- MarkNewNodes(Hi.Val);
}
-void DAGTypeLegalizer::GetSplitOp(SDOperand Op, SDOperand &Lo, SDOperand &Hi) {
- std::pair<SDOperand, SDOperand> &Entry = SplitNodes[Op];
- RemapNode(Entry.first);
- RemapNode(Entry.second);
- assert(Entry.first.Val && "Operand isn't split");
+void DAGTypeLegalizer::GetExpandedFloat(SDValue Op, SDValue &Lo,
+ SDValue &Hi) {
+ std::pair<SDValue, SDValue> &Entry = ExpandedFloats[Op];
+ RemapValue(Entry.first);
+ RemapValue(Entry.second);
+ assert(Entry.first.getNode() && "Operand isn't expanded");
Lo = Entry.first;
Hi = Entry.second;
}
-void DAGTypeLegalizer::SetSplitOp(SDOperand Op, SDOperand Lo, SDOperand Hi) {
+void DAGTypeLegalizer::SetExpandedFloat(SDValue Op, SDValue Lo,
+ SDValue Hi) {
+ assert(Lo.getValueType() ==
+ TLI.getTypeToTransformTo(*DAG.getContext(), Op.getValueType()) &&
+ Hi.getValueType() == Lo.getValueType() &&
+ "Invalid type for expanded float");
+ // Lo/Hi may have been newly allocated, if so, add nodeid's as relevant.
+ AnalyzeNewValue(Lo);
+ AnalyzeNewValue(Hi);
+
// Remember that this is the result of the node.
- std::pair<SDOperand, SDOperand> &Entry = SplitNodes[Op];
- assert(Entry.first.Val == 0 && "Node already split");
+ std::pair<SDValue, SDValue> &Entry = ExpandedFloats[Op];
+ assert(Entry.first.getNode() == 0 && "Node already expanded");
Entry.first = Lo;
Entry.second = Hi;
-
+}
+
+void DAGTypeLegalizer::GetSplitVector(SDValue Op, SDValue &Lo,
+ SDValue &Hi) {
+ std::pair<SDValue, SDValue> &Entry = SplitVectors[Op];
+ RemapValue(Entry.first);
+ RemapValue(Entry.second);
+ assert(Entry.first.getNode() && "Operand isn't split");
+ Lo = Entry.first;
+ Hi = Entry.second;
+}
+
+void DAGTypeLegalizer::SetSplitVector(SDValue Op, SDValue Lo,
+ SDValue Hi) {
+ assert(Lo.getValueType().getVectorElementType() ==
+ Op.getValueType().getVectorElementType() &&
+ 2*Lo.getValueType().getVectorNumElements() ==
+ Op.getValueType().getVectorNumElements() &&
+ Hi.getValueType() == Lo.getValueType() &&
+ "Invalid type for split vector");
// Lo/Hi may have been newly allocated, if so, add nodeid's as relevant.
- if (Lo.Val->getNodeId() == NewNode)
- MarkNewNodes(Lo.Val);
- if (Hi.Val->getNodeId() == NewNode)
- MarkNewNodes(Hi.Val);
+ AnalyzeNewValue(Lo);
+ AnalyzeNewValue(Hi);
+
+ // Remember that this is the result of the node.
+ std::pair<SDValue, SDValue> &Entry = SplitVectors[Op];
+ assert(Entry.first.getNode() == 0 && "Node already split");
+ Entry.first = Lo;
+ Entry.second = Hi;
+}
+
+void DAGTypeLegalizer::SetWidenedVector(SDValue Op, SDValue Result) {
+ assert(Result.getValueType() ==
+ TLI.getTypeToTransformTo(*DAG.getContext(), Op.getValueType()) &&
+ "Invalid type for widened vector");
+ AnalyzeNewValue(Result);
+
+ SDValue &OpEntry = WidenedVectors[Op];
+ assert(OpEntry.getNode() == 0 && "Node already widened!");
+ OpEntry = Result;
+}
+
+
+//===----------------------------------------------------------------------===//
+// Utilities.
+//===----------------------------------------------------------------------===//
+
+/// BitConvertToInteger - Convert to an integer of the same size.
+SDValue DAGTypeLegalizer::BitConvertToInteger(SDValue Op) {
+ unsigned BitWidth = Op.getValueType().getSizeInBits();
+ return DAG.getNode(ISD::BITCAST, Op.getDebugLoc(),
+ EVT::getIntegerVT(*DAG.getContext(), BitWidth), Op);
}
+/// BitConvertVectorToIntegerVector - Convert to a vector of integers of the
+/// same size.
+SDValue DAGTypeLegalizer::BitConvertVectorToIntegerVector(SDValue Op) {
+ assert(Op.getValueType().isVector() && "Only applies to vectors!");
+ unsigned EltWidth = Op.getValueType().getVectorElementType().getSizeInBits();
+ EVT EltNVT = EVT::getIntegerVT(*DAG.getContext(), EltWidth);
+ unsigned NumElts = Op.getValueType().getVectorNumElements();
+ return DAG.getNode(ISD::BITCAST, Op.getDebugLoc(),
+ EVT::getVectorVT(*DAG.getContext(), EltNVT, NumElts), Op);
+}
-SDOperand DAGTypeLegalizer::CreateStackStoreLoad(SDOperand Op,
- MVT::ValueType DestVT) {
- // Create the stack frame object.
- SDOperand FIPtr = DAG.CreateStackTemporary(DestVT);
-
+SDValue DAGTypeLegalizer::CreateStackStoreLoad(SDValue Op,
+ EVT DestVT) {
+ DebugLoc dl = Op.getDebugLoc();
+ // Create the stack frame object. Make sure it is aligned for both
+ // the source and destination types.
+ SDValue StackPtr = DAG.CreateStackTemporary(Op.getValueType(), DestVT);
// Emit a store to the stack slot.
- SDOperand Store = DAG.getStore(DAG.getEntryNode(), Op, FIPtr, NULL, 0);
+ SDValue Store = DAG.getStore(DAG.getEntryNode(), dl, Op, StackPtr,
+ MachinePointerInfo(), false, false, 0);
// Result is a load from the stack slot.
- return DAG.getLoad(DestVT, Store, FIPtr, NULL, 0);
-}
-
-/// HandleMemIntrinsic - This handles memcpy/memset/memmove with invalid
-/// operands. This promotes or expands the operands as required.
-SDOperand DAGTypeLegalizer::HandleMemIntrinsic(SDNode *N) {
- // The chain and pointer [operands #0 and #1] are always valid types.
- SDOperand Chain = N->getOperand(0);
- SDOperand Ptr = N->getOperand(1);
- SDOperand Op2 = N->getOperand(2);
-
- // Op #2 is either a value (memset) or a pointer. Promote it if required.
- switch (getTypeAction(Op2.getValueType())) {
- default: assert(0 && "Unknown action for pointer/value operand");
- case Legal: break;
- case Promote: Op2 = GetPromotedOp(Op2); break;
+ return DAG.getLoad(DestVT, dl, Store, StackPtr, MachinePointerInfo(),
+ false, false, 0);
+}
+
+/// CustomLowerNode - Replace the node's results with custom code provided
+/// by the target and return "true", or do nothing and return "false".
+/// The last parameter is FALSE if we are dealing with a node with legal
+/// result types and illegal operand. The second parameter denotes the type of
+/// illegal OperandNo in that case.
+/// The last parameter being TRUE means we are dealing with a
+/// node with illegal result types. The second parameter denotes the type of
+/// illegal ResNo in that case.
+bool DAGTypeLegalizer::CustomLowerNode(SDNode *N, EVT VT, bool LegalizeResult) {
+ // See if the target wants to custom lower this node.
+ if (TLI.getOperationAction(N->getOpcode(), VT) != TargetLowering::Custom)
+ return false;
+
+ SmallVector<SDValue, 8> Results;
+ if (LegalizeResult)
+ TLI.ReplaceNodeResults(N, Results, DAG);
+ else
+ TLI.LowerOperationWrapper(N, Results, DAG);
+
+ if (Results.empty())
+ // The target didn't want to custom lower it after all.
+ return false;
+
+ // Make everything that once used N's values now use those in Results instead.
+ assert(Results.size() == N->getNumValues() &&
+ "Custom lowering returned the wrong number of results!");
+ for (unsigned i = 0, e = Results.size(); i != e; ++i)
+ ReplaceValueWith(SDValue(N, i), Results[i]);
+ return true;
+}
+
+
+/// CustomWidenLowerNode - Widen the node's results with custom code provided
+/// by the target and return "true", or do nothing and return "false".
+bool DAGTypeLegalizer::CustomWidenLowerNode(SDNode *N, EVT VT) {
+ // See if the target wants to custom lower this node.
+ if (TLI.getOperationAction(N->getOpcode(), VT) != TargetLowering::Custom)
+ return false;
+
+ SmallVector<SDValue, 8> Results;
+ TLI.ReplaceNodeResults(N, Results, DAG);
+
+ if (Results.empty())
+ // The target didn't want to custom widen lower its result after all.
+ return false;
+
+ // Update the widening map.
+ assert(Results.size() == N->getNumValues() &&
+ "Custom lowering returned the wrong number of results!");
+ for (unsigned i = 0, e = Results.size(); i != e; ++i)
+ SetWidenedVector(SDValue(N, i), Results[i]);
+ return true;
+}
+
+SDValue DAGTypeLegalizer::DecomposeMERGE_VALUES(SDNode *N) {
+ unsigned i;
+ // A MERGE_VALUES node can produce any number of values.
+ // We know that the first illegal type needs to be handled.
+ for (i = 0; isTypeLegal(N->getValueType(i)); ++i)
+ ReplaceValueWith(SDValue(N, i), SDValue(N->getOperand(i)));
+
+ // The first illegal result must be the one that needs to be handled.
+ SDValue BadValue = N->getOperand(i);
+
+ // Legalize the rest of the results into the input operands whether they
+ // are legal or not.
+ unsigned e = N->getNumValues();
+ for (++i; i != e; ++i)
+ ReplaceValueWith(SDValue(N, i), SDValue(N->getOperand(i)));
+
+ return BadValue;
+}
+
+/// GetSplitDestVTs - Compute the VTs needed for the low/hi parts of a type
+/// which is split into two not necessarily identical pieces.
+void DAGTypeLegalizer::GetSplitDestVTs(EVT InVT, EVT &LoVT, EVT &HiVT) {
+ // Currently all types are split in half.
+ if (!InVT.isVector()) {
+ LoVT = HiVT = TLI.getTypeToTransformTo(*DAG.getContext(), InVT);
+ } else {
+ unsigned NumElements = InVT.getVectorNumElements();
+ assert(!(NumElements & 1) && "Splitting vector, but not in half!");
+ LoVT = HiVT = EVT::getVectorVT(*DAG.getContext(),
+ InVT.getVectorElementType(), NumElements/2);
}
-
- // The length could have any action required.
- SDOperand Length = N->getOperand(3);
- switch (getTypeAction(Length.getValueType())) {
- default: assert(0 && "Unknown action for memop operand");
- case Legal: break;
- case Promote: Length = GetPromotedZExtOp(Length); break;
- case Expand:
- SDOperand Dummy; // discard the high part.
- GetExpandedOp(Length, Length, Dummy);
- break;
+}
+
+/// GetPairElements - Use ISD::EXTRACT_ELEMENT nodes to extract the low and
+/// high parts of the given value.
+void DAGTypeLegalizer::GetPairElements(SDValue Pair,
+ SDValue &Lo, SDValue &Hi) {
+ DebugLoc dl = Pair.getDebugLoc();
+ EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), Pair.getValueType());
+ Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, NVT, Pair,
+ DAG.getIntPtrConstant(0));
+ Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, NVT, Pair,
+ DAG.getIntPtrConstant(1));
+}
+
+SDValue DAGTypeLegalizer::GetVectorElementPointer(SDValue VecPtr, EVT EltVT,
+ SDValue Index) {
+ DebugLoc dl = Index.getDebugLoc();
+ // Make sure the index type is big enough to compute in.
+ if (Index.getValueType().bitsGT(TLI.getPointerTy()))
+ Index = DAG.getNode(ISD::TRUNCATE, dl, TLI.getPointerTy(), Index);
+ else
+ Index = DAG.getNode(ISD::ZERO_EXTEND, dl, TLI.getPointerTy(), Index);
+
+ // Calculate the element offset and add it to the pointer.
+ unsigned EltSize = EltVT.getSizeInBits() / 8; // FIXME: should be ABI size.
+
+ Index = DAG.getNode(ISD::MUL, dl, Index.getValueType(), Index,
+ DAG.getConstant(EltSize, Index.getValueType()));
+ return DAG.getNode(ISD::ADD, dl, Index.getValueType(), Index, VecPtr);
+}
+
+/// JoinIntegers - Build an integer with low bits Lo and high bits Hi.
+SDValue DAGTypeLegalizer::JoinIntegers(SDValue Lo, SDValue Hi) {
+ // Arbitrarily use dlHi for result DebugLoc
+ DebugLoc dlHi = Hi.getDebugLoc();
+ DebugLoc dlLo = Lo.getDebugLoc();
+ EVT LVT = Lo.getValueType();
+ EVT HVT = Hi.getValueType();
+ EVT NVT = EVT::getIntegerVT(*DAG.getContext(),
+ LVT.getSizeInBits() + HVT.getSizeInBits());
+
+ Lo = DAG.getNode(ISD::ZERO_EXTEND, dlLo, NVT, Lo);
+ Hi = DAG.getNode(ISD::ANY_EXTEND, dlHi, NVT, Hi);
+ Hi = DAG.getNode(ISD::SHL, dlHi, NVT, Hi,
+ DAG.getConstant(LVT.getSizeInBits(), TLI.getPointerTy()));
+ return DAG.getNode(ISD::OR, dlHi, NVT, Lo, Hi);
+}
+
+/// LibCallify - Convert the node into a libcall with the same prototype.
+SDValue DAGTypeLegalizer::LibCallify(RTLIB::Libcall LC, SDNode *N,
+ bool isSigned) {
+ unsigned NumOps = N->getNumOperands();
+ DebugLoc dl = N->getDebugLoc();
+ if (NumOps == 0) {
+ return MakeLibCall(LC, N->getValueType(0), 0, 0, isSigned, dl);
+ } else if (NumOps == 1) {
+ SDValue Op = N->getOperand(0);
+ return MakeLibCall(LC, N->getValueType(0), &Op, 1, isSigned, dl);
+ } else if (NumOps == 2) {
+ SDValue Ops[2] = { N->getOperand(0), N->getOperand(1) };
+ return MakeLibCall(LC, N->getValueType(0), Ops, 2, isSigned, dl);
}
-
- SDOperand Align = N->getOperand(4);
- switch (getTypeAction(Align.getValueType())) {
- default: assert(0 && "Unknown action for memop operand");
- case Legal: break;
- case Promote: Align = GetPromotedZExtOp(Align); break;
+ SmallVector<SDValue, 8> Ops(NumOps);
+ for (unsigned i = 0; i < NumOps; ++i)
+ Ops[i] = N->getOperand(i);
+
+ return MakeLibCall(LC, N->getValueType(0), &Ops[0], NumOps, isSigned, dl);
+}
+
+/// MakeLibCall - Generate a libcall taking the given operands as arguments and
+/// returning a result of type RetVT.
+SDValue DAGTypeLegalizer::MakeLibCall(RTLIB::Libcall LC, EVT RetVT,
+ const SDValue *Ops, unsigned NumOps,
+ bool isSigned, DebugLoc dl) {
+ TargetLowering::ArgListTy Args;
+ Args.reserve(NumOps);
+
+ TargetLowering::ArgListEntry Entry;
+ for (unsigned i = 0; i != NumOps; ++i) {
+ Entry.Node = Ops[i];
+ Entry.Ty = Entry.Node.getValueType().getTypeForEVT(*DAG.getContext());
+ Entry.isSExt = isSigned;
+ Entry.isZExt = !isSigned;
+ Args.push_back(Entry);
}
-
- SDOperand AlwaysInline = N->getOperand(5);
- switch (getTypeAction(AlwaysInline.getValueType())) {
- default: assert(0 && "Unknown action for memop operand");
- case Legal: break;
- case Promote: AlwaysInline = GetPromotedZExtOp(AlwaysInline); break;
+ SDValue Callee = DAG.getExternalSymbol(TLI.getLibcallName(LC),
+ TLI.getPointerTy());
+
+ Type *RetTy = RetVT.getTypeForEVT(*DAG.getContext());
+ std::pair<SDValue,SDValue> CallInfo =
+ TLI.LowerCallTo(DAG.getEntryNode(), RetTy, isSigned, !isSigned, false,
+ false, 0, TLI.getLibcallCallingConv(LC), false,
+ /*isReturnValueUsed=*/true,
+ Callee, Args, DAG, dl);
+ return CallInfo.first;
+}
+
+// ExpandChainLibCall - Expand a node into a call to a libcall. Similar to
+// ExpandLibCall except that the first operand is the in-chain.
+std::pair<SDValue, SDValue>
+DAGTypeLegalizer::ExpandChainLibCall(RTLIB::Libcall LC,
+ SDNode *Node,
+ bool isSigned) {
+ SDValue InChain = Node->getOperand(0);
+
+ TargetLowering::ArgListTy Args;
+ TargetLowering::ArgListEntry Entry;
+ for (unsigned i = 1, e = Node->getNumOperands(); i != e; ++i) {
+ EVT ArgVT = Node->getOperand(i).getValueType();
+ Type *ArgTy = ArgVT.getTypeForEVT(*DAG.getContext());
+ Entry.Node = Node->getOperand(i);
+ Entry.Ty = ArgTy;
+ Entry.isSExt = isSigned;
+ Entry.isZExt = !isSigned;
+ Args.push_back(Entry);
}
-
- SDOperand Ops[] = { Chain, Ptr, Op2, Length, Align, AlwaysInline };
- return DAG.UpdateNodeOperands(SDOperand(N, 0), Ops, 6);
+ SDValue Callee = DAG.getExternalSymbol(TLI.getLibcallName(LC),
+ TLI.getPointerTy());
+
+ // Splice the libcall in wherever FindInputOutputChains tells us to.
+ Type *RetTy = Node->getValueType(0).getTypeForEVT(*DAG.getContext());
+ std::pair<SDValue, SDValue> CallInfo =
+ TLI.LowerCallTo(InChain, RetTy, isSigned, !isSigned, false, false,
+ 0, TLI.getLibcallCallingConv(LC), /*isTailCall=*/false,
+ /*isReturnValueUsed=*/true,
+ Callee, Args, DAG, Node->getDebugLoc());
+
+ return CallInfo;
+}
+
+/// PromoteTargetBoolean - Promote the given target boolean to a target boolean
+/// of the given type. A target boolean is an integer value, not necessarily of
+/// type i1, the bits of which conform to getBooleanContents.
+SDValue DAGTypeLegalizer::PromoteTargetBoolean(SDValue Bool, EVT VT) {
+ DebugLoc dl = Bool.getDebugLoc();
+ ISD::NodeType ExtendCode;
+ switch (TLI.getBooleanContents()) {
+ default:
+ assert(false && "Unknown BooleanContent!");
+ case TargetLowering::UndefinedBooleanContent:
+ // Extend to VT by adding rubbish bits.
+ ExtendCode = ISD::ANY_EXTEND;
+ break;
+ case TargetLowering::ZeroOrOneBooleanContent:
+ // Extend to VT by adding zero bits.
+ ExtendCode = ISD::ZERO_EXTEND;
+ break;
+ case TargetLowering::ZeroOrNegativeOneBooleanContent: {
+ // Extend to VT by copying the sign bit.
+ ExtendCode = ISD::SIGN_EXTEND;
+ break;
+ }
+ }
+ return DAG.getNode(ExtendCode, dl, VT, Bool);
+}
+
+/// SplitInteger - Return the lower LoVT bits of Op in Lo and the upper HiVT
+/// bits in Hi.
+void DAGTypeLegalizer::SplitInteger(SDValue Op,
+ EVT LoVT, EVT HiVT,
+ SDValue &Lo, SDValue &Hi) {
+ DebugLoc dl = Op.getDebugLoc();
+ assert(LoVT.getSizeInBits() + HiVT.getSizeInBits() ==
+ Op.getValueType().getSizeInBits() && "Invalid integer splitting!");
+ Lo = DAG.getNode(ISD::TRUNCATE, dl, LoVT, Op);
+ Hi = DAG.getNode(ISD::SRL, dl, Op.getValueType(), Op,
+ DAG.getConstant(LoVT.getSizeInBits(), TLI.getPointerTy()));
+ Hi = DAG.getNode(ISD::TRUNCATE, dl, HiVT, Hi);
}
-/// SplitOp - Return the lower and upper halves of Op's bits in a value type
-/// half the size of Op's.
-void DAGTypeLegalizer::SplitOp(SDOperand Op, SDOperand &Lo, SDOperand &Hi) {
- unsigned NVTBits = MVT::getSizeInBits(Op.getValueType())/2;
- assert(MVT::getSizeInBits(Op.getValueType()) == 2*NVTBits &&
- "Cannot split odd sized integer type");
- MVT::ValueType NVT = MVT::getIntegerType(NVTBits);
- Lo = DAG.getNode(ISD::TRUNCATE, NVT, Op);
- Hi = DAG.getNode(ISD::SRL, Op.getValueType(), Op,
- DAG.getConstant(NVTBits, TLI.getShiftAmountTy()));
- Hi = DAG.getNode(ISD::TRUNCATE, NVT, Hi);
+/// SplitInteger - Return the lower and upper halves of Op's bits in a value
+/// type half the size of Op's.
+void DAGTypeLegalizer::SplitInteger(SDValue Op,
+ SDValue &Lo, SDValue &Hi) {
+ EVT HalfVT = EVT::getIntegerVT(*DAG.getContext(),
+ Op.getValueType().getSizeInBits()/2);
+ SplitInteger(Op, HalfVT, HalfVT, Lo, Hi);
}
//===----------------------------------------------------------------------===//
/// LegalizeTypes - This transforms the SelectionDAG into a SelectionDAG that
-/// only uses types natively supported by the target.
+/// only uses types natively supported by the target. Returns "true" if it made
+/// any changes.
///
/// Note that this is an involved process that may invalidate pointers into
/// the graph.
-void SelectionDAG::LegalizeTypes() {
- if (ViewLegalizeTypesDAGs) viewGraph();
-
- DAGTypeLegalizer(*this).run();
+bool SelectionDAG::LegalizeTypes() {
+ return DAGTypeLegalizer(*this).run();
}
projects / oota-llvm.git / blobdiff