-//===-- LegalizeDAGTypes.cpp - Implement SelectionDAG::LegalizeTypes ------===//
+//===-- LegalizeTypes.cpp - Common code for DAG type legalizer ------------===//
//
// The LLVM Compiler Infrastructure
//
-// This file was developed by Chris Lattner and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the SelectionDAG::LegalizeTypes method. It transforms
-// an arbitrary well-formed SelectionDAG to only consist of legal types.
+// an arbitrary well-formed SelectionDAG to only consist of legal types. This
+// is common code shared among the LegalizeTypes*.cpp files.
//
//===----------------------------------------------------------------------===//
#include "LegalizeTypes.h"
-#include "llvm/Constants.h"
-#include "llvm/DerivedTypes.h"
-#include "llvm/Support/MathExtras.h"
+#include "llvm/CallingConv.h"
+#include "llvm/ADT/SetVector.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Target/TargetData.h"
using namespace llvm;
+static cl::opt<bool>
+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 only consider non-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) {
+ if (Mapped != 0) {
+ cerr << "Unprocessed value in a map!";
+ Failed = true;
+ }
+ } else if (isTypeLegal(Res.getValueType()) || IgnoreNodeResults(I)) {
+ // FIXME: Because of PR2957, the build vector can be placed on this
+ // list but if the associated vector shuffle is split, the build vector
+ // can also be split so we allow this to go through for now.
+ if (Mapped > 1 && Res.getOpcode() != ISD::BUILD_VECTOR) {
+ cerr << "Value with legal type was transformed!";
+ Failed = true;
+ }
+ } else {
+ if (Mapped == 0) {
+ cerr << "Processed value not in any map!";
+ Failed = true;
+ } else if (Mapped & (Mapped - 1)) {
+ cerr << "Value in multiple maps!";
+ Failed = true;
+ }
+ }
+
+ if (Failed) {
+ if (Mapped & 1)
+ cerr << " ReplacedValues";
+ if (Mapped & 2)
+ cerr << " PromotedIntegers";
+ if (Mapped & 4)
+ cerr << " SoftenedFloats";
+ if (Mapped & 8)
+ cerr << " ScalarizedVectors";
+ if (Mapped & 16)
+ cerr << " ExpandedIntegers";
+ if (Mapped & 32)
+ cerr << " ExpandedFloats";
+ if (Mapped & 64)
+ cerr << " SplitVectors";
+ if (Mapped & 128)
+ cerr << " WidenedVectors";
+ cerr << "\n";
+ abort();
+ }
+ }
+ }
+
+ // 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) {
+ MVT ResultVT = N->getValueType(i);
+ switch (getTypeAction(ResultVT)) {
+ default:
+ assert(false && "Unknown action!");
+ case Legal:
+ 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 PromoteInteger:
+ 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 // Split the vector in half.
- assert(0 && "Vector splitting not implemented");
+ case ExpandInteger:
+ ExpandIntegerResult(N, i);
+ Changed = true;
+ goto NodeDone;
+ case SoftenFloat:
+ SoftenFloatResult(N, i);
+ Changed = true;
+ goto NodeDone;
+ case ExpandFloat:
+ ExpandFloatResult(N, i);
+ Changed = true;
+ goto NodeDone;
+ case ScalarizeVector:
+ ScalarizeVectorResult(N, i);
+ Changed = true;
+ goto NodeDone;
+ case SplitVector:
+ SplitVectorResult(N, i);
+ Changed = true;
+ goto NodeDone;
+ case WidenVector:
+ 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;
+
+ if (N->getOpcode() == ISD::VECTOR_SHUFFLE && i == 2) {
+ // The shuffle mask doesn't need to be a legal vector type.
+ // FIXME: We can remove this once we fix PR2957.
+ SetIgnoredNodeResult(N->getOperand(2).getNode());
+ continue;
+ }
+
+ MVT OpVT = N->getOperand(i).getValueType();
+ switch (getTypeAction(OpVT)) {
+ default:
+ assert(false && "Unknown action!");
+ case Legal:
+ 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 PromoteInteger:
+ 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 {
- // Split the vector in half.
- assert(0 && "Vector splitting not implemented");
- }
+ case ExpandInteger:
+ NeedsReanalyzing = ExpandIntegerOperand(N, i);
+ Changed = true;
+ break;
+ case SoftenFloat:
+ NeedsReanalyzing = SoftenFloatOperand(N, i);
+ Changed = true;
+ break;
+ case ExpandFloat:
+ NeedsReanalyzing = ExpandFloatOperand(N, i);
+ Changed = true;
+ break;
+ case ScalarizeVector:
+ NeedsReanalyzing = ScalarizeVectorOperand(N, i);
+ Changed = true;
+ break;
+ case SplitVector:
+ NeedsReanalyzing = SplitVectorOperand(N, i);
+ Changed = true;
+ break;
+ case WidenVector:
+ 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. However
+ // there is no need to remember the replacement - morphing will make sure
+ // it is never used non-trivially.
+ 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. Do the
+ // replacement without recording it in ReplacedValues. This does not
+ // expunge From but that is fine - it is not really a new node.
+ ReplaceValueWithHelper(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)
+ }
+
+ if (i == NumOperands) {
DEBUG(cerr << "Legally typed node: "; N->dump(&DAG); cerr << "\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
#ifndef NDEBUG
for (SelectionDAG::allnodes_iterator I = DAG.allnodes_begin(),
E = DAG.allnodes_end(); I != E; ++I) {
- if (I->getNodeId() == Processed)
- continue;
- cerr << "Unprocessed node: ";
- I->dump(&DAG); cerr << "\n";
+ bool Failed = false;
+
+ // Check that all result types are legal.
+ if (!IgnoreNodeResults(I))
+ for (unsigned i = 0, NumVals = I->getNumValues(); i < NumVals; ++i)
+ if (!isTypeLegal(I->getValueType(i))) {
+ cerr << "Result type " << i << " illegal!\n";
+ Failed = true;
+ }
- if (I->getNodeId() == NewNode)
- cerr << "New node not 'noticed'?\n";
- else if (I->getNodeId() > 0)
- cerr << "Operand not processed?\n";
- else if (I->getNodeId() == ReadyToProcess)
- cerr << "Not added to worklist?\n";
- abort();
+ // Check that all operand types are legal.
+ for (unsigned i = 0, NumOps = I->getNumOperands(); i < NumOps; ++i)
+ if (!IgnoreNodeResults(I->getOperand(i).getNode()) &&
+ !isTypeLegal(I->getOperand(i).getValueType())) {
+ cerr << "Operand type " << i << " illegal!\n";
+ Failed = true;
+ }
+
+ if (I->getNodeId() != Processed) {
+ if (I->getNodeId() == NewNode)
+ cerr << "New node not analyzed?\n";
+ else if (I->getNodeId() == Unanalyzed)
+ cerr << "Unanalyzed node not noticed?\n";
+ else if (I->getNodeId() > 0)
+ cerr << "Operand not processed?\n";
+ else if (I->getNodeId() == ReadyToProcess)
+ cerr << "Not added to worklist?\n";
+ Failed = true;
+ }
+
+ if (Failed) {
+ I->dump(&DAG); cerr << "\n";
+ abort();
+ }
}
#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;
- }
-
- N->setNodeId(N->getNumOperands()-NumProcessed);
- if (N->getNodeId() == ReadyToProcess)
- Worklist.push_back(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;
-
- // If expansion produced new nodes, make sure they are properly marked.
- if (To.Val->getNodeId() == NewNode)
- MarkNewNodes(To.Val);
-
- // Anything that used the old node should now use the new one. Note that this
- // can potentially cause recursive merging.
- DAG.ReplaceAllUsesOfValueWith(From, To);
-
- // The old node may still be present in ExpandedNodes or PromotedNodes.
- // Inform them about the replacement.
- ReplacedNodes[From] = To;
-
- // Since we just made an unstructured update to the DAG, which could wreak
- // general havoc on anything that once used From and now uses To, walk all
- // users of the result, updating their flags.
- for (SDNode::use_iterator I = To.Val->use_begin(), E = To.Val->use_end();
- I != E; ++I) {
- SDNode *User = *I;
- // If the node isn't already processed or in the worklist, mark it as new,
- // then use MarkNewNodes to recompute its ID.
- int NodeId = User->getNodeId();
- if (NodeId != ReadyToProcess && NodeId != Processed) {
- User->setNodeId(NewNode);
- MarkNewNodes(User);
+ 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.
+ for (unsigned j = 0; j < i; ++j)
+ NewOps.push_back(N->getOperand(j));
+ NewOps.push_back(Op);
}
}
-}
-/// 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.
- DAG.ReplaceAllUsesWith(From, To);
-
- // 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);
- }
-
- // Since we just made an unstructured update to the DAG, which could wreak
- // general havoc on anything that once used From and now uses To, walk all
- // users of the result, updating their flags.
- for (SDNode::use_iterator I = To->use_begin(), E = To->use_end();I != E; ++I){
- SDNode *User = *I;
- // If the node isn't already processed or in the worklist, mark it as new,
- // then use MarkNewNodes to recompute its ID.
- int NodeId = User->getNodeId();
- if (NodeId != ReadyToProcess && NodeId != Processed) {
- User->setNodeId(NewNode);
- MarkNewNodes(User);
+ // Some operands changed - update the node.
+ if (!NewOps.empty()) {
+ SDNode *M = DAG.UpdateNodeOperands(SDValue(N, 0), &NewOps[0],
+ NewOps.size()).getNode();
+ 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);
}
}
-}
+ // Calculate the NodeId.
+ N->setNodeId(N->getNumOperands() - NumProcessed);
+ if (N->getNodeId() == ReadyToProcess)
+ Worklist.push_back(N);
-/// 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;
- }
-}
-
-void DAGTypeLegalizer::SetPromotedOp(SDOperand Op, SDOperand Result) {
- if (Result.Val->getNodeId() == NewNode)
- MarkNewNodes(Result.Val);
-
- SDOperand &OpEntry = PromotedNodes[Op];
- assert(OpEntry.Val == 0 && "Node is already promoted!");
- 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!");
- OpEntry = Result;
-}
-
+ 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;
-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");
- Lo = Entry.first;
- Hi = Entry.second;
-}
+ // 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;
-void DAGTypeLegalizer::SetExpandedOp(SDOperand Op, SDOperand Lo,
- SDOperand 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");
- 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);
-}
+ if (i == e)
+ return;
-SDOperand DAGTypeLegalizer::CreateStackStoreLoad(SDOperand Op,
- MVT::ValueType DestVT) {
- // Create the stack frame object.
- SDOperand FIPtr = DAG.CreateStackTemporary(DestVT);
-
- // Emit a store to the stack slot.
- SDOperand Store = DAG.getStore(DAG.getEntryNode(), Op, FIPtr, NULL, 0);
- // Result is a load from the stack slot.
- return DAG.getLoad(DestVT, Store, FIPtr, NULL, 0);
-}
+ // Remove N from all maps - this is expensive but rare.
-/// 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;
+ for (DenseMap<SDValue, SDValue>::iterator I = PromotedIntegers.begin(),
+ E = PromotedIntegers.end(); I != E; ++I) {
+ assert(I->first.getNode() != N);
+ RemapValue(I->second);
}
-
- // 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;
- }
-
- 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;
- }
-
- 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;
- }
-
- SDOperand Ops[] = { Chain, Ptr, Op2, Length, Align, AlwaysInline };
- return DAG.UpdateNodeOperands(SDOperand(N, 0), Ops, 6);
-}
-
-/// 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);
-}
-
-//===----------------------------------------------------------------------===//
-// Result Promotion
-//===----------------------------------------------------------------------===//
-
-/// PromoteResult - This method is called when a result of a node is found to be
-/// in need of promotion to a larger type. At this point, the node may also
-/// have invalid operands or may have other results that need expansion, we just
-/// know that (at least) one result needs promotion.
-void DAGTypeLegalizer::PromoteResult(SDNode *N, unsigned ResNo) {
- DEBUG(cerr << "Promote node result: "; N->dump(&DAG); cerr << "\n");
- SDOperand Result = SDOperand();
-
- switch (N->getOpcode()) {
- default:
-#ifndef NDEBUG
- cerr << "PromoteResult #" << ResNo << ": ";
- N->dump(&DAG); cerr << "\n";
-#endif
- assert(0 && "Do not know how to promote this operator!");
- abort();
- case ISD::UNDEF: Result = PromoteResult_UNDEF(N); break;
- case ISD::Constant: Result = PromoteResult_Constant(N); break;
-
- case ISD::TRUNCATE: Result = PromoteResult_TRUNCATE(N); break;
- case ISD::SIGN_EXTEND:
- case ISD::ZERO_EXTEND:
- case ISD::ANY_EXTEND: Result = PromoteResult_INT_EXTEND(N); break;
- case ISD::FP_ROUND: Result = PromoteResult_FP_ROUND(N); break;
- case ISD::FP_TO_SINT:
- case ISD::FP_TO_UINT: Result = PromoteResult_FP_TO_XINT(N); break;
- case ISD::SETCC: Result = PromoteResult_SETCC(N); break;
- case ISD::LOAD: Result = PromoteResult_LOAD(cast<LoadSDNode>(N)); break;
-
- case ISD::AND:
- case ISD::OR:
- case ISD::XOR:
- case ISD::ADD:
- case ISD::SUB:
- case ISD::MUL: Result = PromoteResult_SimpleIntBinOp(N); break;
-
- case ISD::SDIV:
- case ISD::SREM: Result = PromoteResult_SDIV(N); break;
-
- case ISD::UDIV:
- case ISD::UREM: Result = PromoteResult_UDIV(N); break;
-
- case ISD::SHL: Result = PromoteResult_SHL(N); break;
- case ISD::SRA: Result = PromoteResult_SRA(N); break;
- case ISD::SRL: Result = PromoteResult_SRL(N); break;
-
- case ISD::SELECT: Result = PromoteResult_SELECT(N); break;
- case ISD::SELECT_CC: Result = PromoteResult_SELECT_CC(N); break;
-
- }
-
- // If Result is null, the sub-method took care of registering the result.
- if (Result.Val)
- SetPromotedOp(SDOperand(N, ResNo), Result);
-}
-
-SDOperand DAGTypeLegalizer::PromoteResult_UNDEF(SDNode *N) {
- return DAG.getNode(ISD::UNDEF, TLI.getTypeToTransformTo(N->getValueType(0)));
-}
-
-SDOperand DAGTypeLegalizer::PromoteResult_Constant(SDNode *N) {
- MVT::ValueType VT = N->getValueType(0);
- // Zero extend things like i1, sign extend everything else. It shouldn't
- // matter in theory which one we pick, but this tends to give better code?
- unsigned Opc = VT != MVT::i1 ? ISD::SIGN_EXTEND : ISD::ZERO_EXTEND;
- SDOperand Result = DAG.getNode(Opc, TLI.getTypeToTransformTo(VT),
- SDOperand(N, 0));
- assert(isa<ConstantSDNode>(Result) && "Didn't constant fold ext?");
- return Result;
-}
-
-SDOperand DAGTypeLegalizer::PromoteResult_TRUNCATE(SDNode *N) {
- SDOperand Res;
-
- switch (getTypeAction(N->getOperand(0).getValueType())) {
- default: assert(0 && "Unknown type action!");
- case Legal:
- case Expand:
- Res = N->getOperand(0);
- break;
- case Promote:
- Res = GetPromotedOp(N->getOperand(0));
- break;
+ for (DenseMap<SDValue, SDValue>::iterator I = SoftenedFloats.begin(),
+ E = SoftenedFloats.end(); I != E; ++I) {
+ assert(I->first.getNode() != N);
+ RemapValue(I->second);
}
- MVT::ValueType NVT = TLI.getTypeToTransformTo(N->getValueType(0));
- assert(MVT::getSizeInBits(Res.getValueType()) >= MVT::getSizeInBits(NVT) &&
- "Truncation doesn't make sense!");
- if (Res.getValueType() == NVT)
- return Res;
-
- // Truncate to NVT instead of VT
- return DAG.getNode(ISD::TRUNCATE, NVT, Res);
-}
-
-SDOperand DAGTypeLegalizer::PromoteResult_INT_EXTEND(SDNode *N) {
- MVT::ValueType NVT = TLI.getTypeToTransformTo(N->getValueType(0));
-
- if (getTypeAction(N->getOperand(0).getValueType()) == Promote) {
- SDOperand Res = GetPromotedOp(N->getOperand(0));
- assert(MVT::getSizeInBits(Res.getValueType()) <= MVT::getSizeInBits(NVT) &&
- "Extension doesn't make sense!");
-
- // If the result and operand types are the same after promotion, simplify
- // to an in-register extension.
- if (NVT == Res.getValueType()) {
- // The high bits are not guaranteed to be anything. Insert an extend.
- if (N->getOpcode() == ISD::SIGN_EXTEND)
- return DAG.getNode(ISD::SIGN_EXTEND_INREG, NVT, Res,
- DAG.getValueType(N->getOperand(0).getValueType()));
- if (N->getOpcode() == ISD::ZERO_EXTEND)
- return DAG.getZeroExtendInReg(Res, N->getOperand(0).getValueType());
- assert(N->getOpcode() == ISD::ANY_EXTEND && "Unknown integer extension!");
- return Res;
- }
+ for (DenseMap<SDValue, SDValue>::iterator I = ScalarizedVectors.begin(),
+ E = ScalarizedVectors.end(); I != E; ++I) {
+ assert(I->first.getNode() != N);
+ RemapValue(I->second);
}
- // Otherwise, just extend the original operand all the way to the larger type.
- return DAG.getNode(N->getOpcode(), NVT, N->getOperand(0));
-}
-
-SDOperand DAGTypeLegalizer::PromoteResult_FP_ROUND(SDNode *N) {
- // NOTE: Assumes input is legal.
- return DAG.getNode(ISD::FP_ROUND_INREG, N->getOperand(0).getValueType(),
- N->getOperand(0), DAG.getValueType(N->getValueType(0)));
-}
-
-SDOperand DAGTypeLegalizer::PromoteResult_FP_TO_XINT(SDNode *N) {
- SDOperand Op = N->getOperand(0);
- // If the operand needed to be promoted, do so now.
- if (getTypeAction(Op.getValueType()) == Promote)
- // The input result is prerounded, so we don't have to do anything special.
- Op = GetPromotedOp(Op);
-
- unsigned NewOpc = N->getOpcode();
- MVT::ValueType NVT = TLI.getTypeToTransformTo(N->getValueType(0));
-
- // If we're promoting a UINT to a larger size, check to see if the new node
- // will be legal. If it isn't, check to see if FP_TO_SINT is legal, since
- // we can use that instead. This allows us to generate better code for
- // FP_TO_UINT for small destination sizes on targets where FP_TO_UINT is not
- // legal, such as PowerPC.
- if (N->getOpcode() == ISD::FP_TO_UINT) {
- if (!TLI.isOperationLegal(ISD::FP_TO_UINT, NVT) &&
- (TLI.isOperationLegal(ISD::FP_TO_SINT, NVT) ||
- TLI.getOperationAction(ISD::FP_TO_SINT, NVT)==TargetLowering::Custom))
- NewOpc = ISD::FP_TO_SINT;
+ for (DenseMap<SDValue, SDValue>::iterator I = WidenedVectors.begin(),
+ E = WidenedVectors.end(); I != E; ++I) {
+ assert(I->first.getNode() != N);
+ RemapValue(I->second);
}
- return DAG.getNode(NewOpc, NVT, Op);
-}
-
-SDOperand DAGTypeLegalizer::PromoteResult_SETCC(SDNode *N) {
- assert(isTypeLegal(TLI.getSetCCResultTy()) && "SetCC type is not legal??");
- return DAG.getNode(ISD::SETCC, TLI.getSetCCResultTy(), N->getOperand(0),
- N->getOperand(1), N->getOperand(2));
-}
-
-SDOperand DAGTypeLegalizer::PromoteResult_LOAD(LoadSDNode *N) {
- MVT::ValueType NVT = TLI.getTypeToTransformTo(N->getValueType(0));
- ISD::LoadExtType ExtType =
- ISD::isNON_EXTLoad(N) ? ISD::EXTLOAD : N->getExtensionType();
- SDOperand Res = DAG.getExtLoad(ExtType, NVT, N->getChain(), N->getBasePtr(),
- N->getSrcValue(), N->getSrcValueOffset(),
- N->getLoadedVT(), N->isVolatile(),
- N->getAlignment());
-
- // Legalized the chain result - switch anything that used the old chain to
- // use the new one.
- ReplaceValueWith(SDOperand(N, 1), Res.getValue(1));
- return Res;
-}
-
-SDOperand DAGTypeLegalizer::PromoteResult_SimpleIntBinOp(SDNode *N) {
- // The input may have strange things in the top bits of the registers, but
- // these operations don't care. They may have weird bits going out, but
- // that too is okay if they are integer operations.
- SDOperand LHS = GetPromotedOp(N->getOperand(0));
- SDOperand RHS = GetPromotedOp(N->getOperand(1));
- return DAG.getNode(N->getOpcode(), LHS.getValueType(), LHS, RHS);
-}
-
-SDOperand DAGTypeLegalizer::PromoteResult_SDIV(SDNode *N) {
- // Sign extend the input.
- SDOperand LHS = GetPromotedOp(N->getOperand(0));
- SDOperand RHS = GetPromotedOp(N->getOperand(1));
- MVT::ValueType VT = N->getValueType(0);
- LHS = DAG.getNode(ISD::SIGN_EXTEND_INREG, LHS.getValueType(), LHS,
- DAG.getValueType(VT));
- RHS = DAG.getNode(ISD::SIGN_EXTEND_INREG, RHS.getValueType(), RHS,
- DAG.getValueType(VT));
-
- return DAG.getNode(N->getOpcode(), LHS.getValueType(), LHS, RHS);
-}
-
-SDOperand DAGTypeLegalizer::PromoteResult_UDIV(SDNode *N) {
- // Zero extend the input.
- SDOperand LHS = GetPromotedOp(N->getOperand(0));
- SDOperand RHS = GetPromotedOp(N->getOperand(1));
- MVT::ValueType VT = N->getValueType(0);
- LHS = DAG.getZeroExtendInReg(LHS, VT);
- RHS = DAG.getZeroExtendInReg(RHS, VT);
-
- return DAG.getNode(N->getOpcode(), LHS.getValueType(), LHS, RHS);
-}
-
-SDOperand DAGTypeLegalizer::PromoteResult_SHL(SDNode *N) {
- return DAG.getNode(ISD::SHL, TLI.getTypeToTransformTo(N->getValueType(0)),
- GetPromotedOp(N->getOperand(0)), N->getOperand(1));
-}
-
-SDOperand DAGTypeLegalizer::PromoteResult_SRA(SDNode *N) {
- // The input value must be properly sign extended.
- MVT::ValueType VT = N->getValueType(0);
- MVT::ValueType NVT = TLI.getTypeToTransformTo(VT);
- SDOperand Res = GetPromotedOp(N->getOperand(0));
- Res = DAG.getNode(ISD::SIGN_EXTEND_INREG, NVT, Res, DAG.getValueType(VT));
- return DAG.getNode(ISD::SRA, NVT, Res, N->getOperand(1));
-}
-
-SDOperand DAGTypeLegalizer::PromoteResult_SRL(SDNode *N) {
- // The input value must be properly zero extended.
- MVT::ValueType VT = N->getValueType(0);
- MVT::ValueType NVT = TLI.getTypeToTransformTo(VT);
- SDOperand Res = GetPromotedZExtOp(N->getOperand(0));
- return DAG.getNode(ISD::SRL, NVT, Res, N->getOperand(1));
-}
-
-SDOperand DAGTypeLegalizer::PromoteResult_SELECT(SDNode *N) {
- SDOperand LHS = GetPromotedOp(N->getOperand(1));
- SDOperand RHS = GetPromotedOp(N->getOperand(2));
- return DAG.getNode(ISD::SELECT, LHS.getValueType(), N->getOperand(0),LHS,RHS);
-}
-
-SDOperand DAGTypeLegalizer::PromoteResult_SELECT_CC(SDNode *N) {
- SDOperand LHS = GetPromotedOp(N->getOperand(2));
- SDOperand RHS = GetPromotedOp(N->getOperand(3));
- return DAG.getNode(ISD::SELECT_CC, LHS.getValueType(), N->getOperand(0),
- N->getOperand(1), LHS, RHS, N->getOperand(4));
-}
-
-
-//===----------------------------------------------------------------------===//
-// Result Expansion
-//===----------------------------------------------------------------------===//
-
-/// ExpandResult - This method is called when the specified result of the
-/// specified node is found to need expansion. At this point, the node may also
-/// have invalid operands or may have other results that need promotion, we just
-/// know that (at least) one result needs expansion.
-void DAGTypeLegalizer::ExpandResult(SDNode *N, unsigned ResNo) {
- DEBUG(cerr << "Expand node result: "; N->dump(&DAG); cerr << "\n");
- SDOperand Lo, Hi;
- Lo = Hi = SDOperand();
-
- // See if the target wants to custom expand this node.
- if (TLI.getOperationAction(N->getOpcode(), N->getValueType(0)) ==
- TargetLowering::Custom) {
- // If the target wants to, allow it to lower this itself.
- if (SDNode *P = TLI.ExpandOperationResult(N, DAG)) {
- // Everything that once used N now uses P. We are guaranteed that the
- // result value types of N and the result value types of P match.
- ReplaceNodeWith(N, P);
- return;
- }
+ 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);
}
- switch (N->getOpcode()) {
- default:
-#ifndef NDEBUG
- cerr << "ExpandResult #" << ResNo << ": ";
- N->dump(&DAG); cerr << "\n";
-#endif
- assert(0 && "Do not know how to expand the result of this operator!");
- abort();
-
- case ISD::UNDEF: ExpandResult_UNDEF(N, Lo, Hi); break;
- case ISD::Constant: ExpandResult_Constant(N, Lo, Hi); break;
- case ISD::BUILD_PAIR: ExpandResult_BUILD_PAIR(N, Lo, Hi); break;
- case ISD::MERGE_VALUES: ExpandResult_MERGE_VALUES(N, Lo, Hi); break;
- case ISD::ANY_EXTEND: ExpandResult_ANY_EXTEND(N, Lo, Hi); break;
- case ISD::ZERO_EXTEND: ExpandResult_ZERO_EXTEND(N, Lo, Hi); break;
- case ISD::SIGN_EXTEND: ExpandResult_SIGN_EXTEND(N, Lo, Hi); break;
- case ISD::BIT_CONVERT: ExpandResult_BIT_CONVERT(N, Lo, Hi); break;
- case ISD::SIGN_EXTEND_INREG: ExpandResult_SIGN_EXTEND_INREG(N, Lo, Hi); break;
- case ISD::LOAD: ExpandResult_LOAD(cast<LoadSDNode>(N), Lo, Hi); break;
-
- case ISD::AND:
- case ISD::OR:
- case ISD::XOR: ExpandResult_Logical(N, Lo, Hi); break;
- case ISD::BSWAP: ExpandResult_BSWAP(N, Lo, Hi); break;
- case ISD::ADD:
- case ISD::SUB: ExpandResult_ADDSUB(N, Lo, Hi); break;
- case ISD::ADDC:
- case ISD::SUBC: ExpandResult_ADDSUBC(N, Lo, Hi); break;
- case ISD::ADDE:
- case ISD::SUBE: ExpandResult_ADDSUBE(N, Lo, Hi); break;
- case ISD::SELECT: ExpandResult_SELECT(N, Lo, Hi); break;
- case ISD::SELECT_CC: ExpandResult_SELECT_CC(N, Lo, Hi); break;
- case ISD::MUL: ExpandResult_MUL(N, Lo, Hi); break;
- case ISD::SHL:
- case ISD::SRA:
- case ISD::SRL: ExpandResult_Shift(N, Lo, Hi); break;
+ 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);
}
-
- // If Lo/Hi is null, the sub-method took care of registering results etc.
- if (Lo.Val)
- SetExpandedOp(SDOperand(N, ResNo), Lo, Hi);
-}
-
-void DAGTypeLegalizer::ExpandResult_UNDEF(SDNode *N,
- SDOperand &Lo, SDOperand &Hi) {
- MVT::ValueType NVT = TLI.getTypeToTransformTo(N->getValueType(0));
- Lo = Hi = DAG.getNode(ISD::UNDEF, NVT);
-}
-
-void DAGTypeLegalizer::ExpandResult_Constant(SDNode *N,
- SDOperand &Lo, SDOperand &Hi) {
- MVT::ValueType NVT = TLI.getTypeToTransformTo(N->getValueType(0));
- uint64_t Cst = cast<ConstantSDNode>(N)->getValue();
- Lo = DAG.getConstant(Cst, NVT);
- Hi = DAG.getConstant(Cst >> MVT::getSizeInBits(NVT), NVT);
-}
-
-void DAGTypeLegalizer::ExpandResult_BUILD_PAIR(SDNode *N,
- SDOperand &Lo, SDOperand &Hi) {
- // Return the operands.
- Lo = N->getOperand(0);
- Hi = N->getOperand(1);
-}
-
-void DAGTypeLegalizer::ExpandResult_MERGE_VALUES(SDNode *N,
- SDOperand &Lo, SDOperand &Hi) {
- // A MERGE_VALUES node can produce any number of values. We know that the
- // first illegal one needs to be expanded into Lo/Hi.
- unsigned i;
-
- // The string of legal results gets turns into the input operands, which have
- // the same type.
- for (i = 0; isTypeLegal(N->getValueType(i)); ++i)
- ReplaceValueWith(SDOperand(N, i), SDOperand(N->getOperand(i)));
-
- // The first illegal result must be the one that needs to be expanded.
- GetExpandedOp(N->getOperand(i), Lo, Hi);
-
- // 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(SDOperand(N, i), SDOperand(N->getOperand(i)));
-}
-void DAGTypeLegalizer::ExpandResult_ANY_EXTEND(SDNode *N,
- SDOperand &Lo, SDOperand &Hi) {
- MVT::ValueType NVT = TLI.getTypeToTransformTo(N->getValueType(0));
- SDOperand Op = N->getOperand(0);
- if (MVT::getSizeInBits(Op.getValueType()) <= MVT::getSizeInBits(NVT)) {
- // The low part is any extension of the input (which degenerates to a copy).
- Lo = DAG.getNode(ISD::ANY_EXTEND, NVT, Op);
- Hi = DAG.getNode(ISD::UNDEF, NVT); // The high part is undefined.
- } else {
- // For example, extension of an i48 to an i64. The operand type necessarily
- // promotes to the result type, so will end up being expanded too.
- assert(getTypeAction(Op.getValueType()) == Promote &&
- "Don't know how to expand this result!");
- SDOperand Res = GetPromotedOp(Op);
- assert(Res.getValueType() == N->getValueType(0) &&
- "Operand over promoted?");
- // Split the promoted operand. This will simplify when it is expanded.
- SplitOp(Res, Lo, Hi);
+ 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);
}
-}
-void DAGTypeLegalizer::ExpandResult_ZERO_EXTEND(SDNode *N,
- SDOperand &Lo, SDOperand &Hi) {
- MVT::ValueType NVT = TLI.getTypeToTransformTo(N->getValueType(0));
- SDOperand Op = N->getOperand(0);
- if (MVT::getSizeInBits(Op.getValueType()) <= MVT::getSizeInBits(NVT)) {
- // The low part is zero extension of the input (which degenerates to a copy).
- Lo = DAG.getNode(ISD::ZERO_EXTEND, NVT, N->getOperand(0));
- Hi = DAG.getConstant(0, NVT); // The high part is just a zero.
- } else {
- // For example, extension of an i48 to an i64. The operand type necessarily
- // promotes to the result type, so will end up being expanded too.
- assert(getTypeAction(Op.getValueType()) == Promote &&
- "Don't know how to expand this result!");
- SDOperand Res = GetPromotedOp(Op);
- assert(Res.getValueType() == N->getValueType(0) &&
- "Operand over promoted?");
- // Split the promoted operand. This will simplify when it is expanded.
- SplitOp(Res, Lo, Hi);
- unsigned ExcessBits =
- MVT::getSizeInBits(Op.getValueType()) - MVT::getSizeInBits(NVT);
- Hi = DAG.getZeroExtendInReg(Hi, MVT::getIntegerType(ExcessBits));
- }
-}
+ for (DenseMap<SDValue, SDValue>::iterator I = ReplacedValues.begin(),
+ E = ReplacedValues.end(); I != E; ++I)
+ RemapValue(I->second);
-void DAGTypeLegalizer::ExpandResult_SIGN_EXTEND(SDNode *N,
- SDOperand &Lo, SDOperand &Hi) {
- MVT::ValueType NVT = TLI.getTypeToTransformTo(N->getValueType(0));
- SDOperand Op = N->getOperand(0);
- if (MVT::getSizeInBits(Op.getValueType()) <= MVT::getSizeInBits(NVT)) {
- // The low part is sign extension of the input (which degenerates to a copy).
- Lo = DAG.getNode(ISD::SIGN_EXTEND, NVT, N->getOperand(0));
- // The high part is obtained by SRA'ing all but one of the bits of low part.
- unsigned LoSize = MVT::getSizeInBits(NVT);
- Hi = DAG.getNode(ISD::SRA, NVT, Lo,
- DAG.getConstant(LoSize-1, TLI.getShiftAmountTy()));
- } else {
- // For example, extension of an i48 to an i64. The operand type necessarily
- // promotes to the result type, so will end up being expanded too.
- assert(getTypeAction(Op.getValueType()) == Promote &&
- "Don't know how to expand this result!");
- SDOperand Res = GetPromotedOp(Op);
- assert(Res.getValueType() == N->getValueType(0) &&
- "Operand over promoted?");
- // Split the promoted operand. This will simplify when it is expanded.
- SplitOp(Res, Lo, Hi);
- unsigned ExcessBits =
- MVT::getSizeInBits(Op.getValueType()) - MVT::getSizeInBits(NVT);
- Hi = DAG.getNode(ISD::SIGN_EXTEND_INREG, Hi.getValueType(), Hi,
- DAG.getValueType(MVT::getIntegerType(ExcessBits)));
- }
+ for (unsigned i = 0, e = N->getNumValues(); i != e; ++i)
+ ReplacedValues.erase(SDValue(N, i));
}
-void DAGTypeLegalizer::ExpandResult_BIT_CONVERT(SDNode *N,
- SDOperand &Lo, SDOperand &Hi) {
- // Lower the bit-convert to a store/load from the stack, then expand the load.
- SDOperand Op = CreateStackStoreLoad(N->getOperand(0), N->getValueType(0));
- ExpandResult_LOAD(cast<LoadSDNode>(Op.Val), Lo, Hi);
-}
-
-void DAGTypeLegalizer::
-ExpandResult_SIGN_EXTEND_INREG(SDNode *N, SDOperand &Lo, SDOperand &Hi) {
- GetExpandedOp(N->getOperand(0), Lo, Hi);
- MVT::ValueType EVT = cast<VTSDNode>(N->getOperand(1))->getVT();
-
- if (MVT::getSizeInBits(EVT) <= MVT::getSizeInBits(Lo.getValueType())) {
- // sext_inreg the low part if needed.
- Lo = DAG.getNode(ISD::SIGN_EXTEND_INREG, Lo.getValueType(), Lo,
- N->getOperand(1));
-
- // The high part gets the sign extension from the lo-part. This handles
- // things like sextinreg V:i64 from i8.
- Hi = DAG.getNode(ISD::SRA, Hi.getValueType(), Lo,
- DAG.getConstant(MVT::getSizeInBits(Hi.getValueType())-1,
- TLI.getShiftAmountTy()));
- } else {
- // For example, extension of an i48 to an i64. Leave the low part alone,
- // sext_inreg the high part.
- unsigned ExcessBits =
- MVT::getSizeInBits(EVT) - MVT::getSizeInBits(Lo.getValueType());
- Hi = DAG.getNode(ISD::SIGN_EXTEND_INREG, Hi.getValueType(), Hi,
- DAG.getValueType(MVT::getIntegerType(ExcessBits)));
+/// 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!");
}
}
-void DAGTypeLegalizer::ExpandResult_LOAD(LoadSDNode *N,
- SDOperand &Lo, SDOperand &Hi) {
- MVT::ValueType VT = N->getValueType(0);
- MVT::ValueType NVT = TLI.getTypeToTransformTo(VT);
- SDOperand Ch = N->getChain(); // Legalize the chain.
- SDOperand Ptr = N->getBasePtr(); // Legalize the pointer.
- ISD::LoadExtType ExtType = N->getExtensionType();
- int SVOffset = N->getSrcValueOffset();
- unsigned Alignment = N->getAlignment();
- bool isVolatile = N->isVolatile();
-
- assert(!(MVT::getSizeInBits(NVT) & 7) && "Expanded type not byte sized!");
-
- if (ExtType == ISD::NON_EXTLOAD) {
- Lo = DAG.getLoad(NVT, Ch, Ptr, N->getSrcValue(), SVOffset,
- isVolatile, Alignment);
- // Increment the pointer to the other half.
- unsigned IncrementSize = MVT::getSizeInBits(NVT)/8;
- Ptr = DAG.getNode(ISD::ADD, Ptr.getValueType(), Ptr,
- getIntPtrConstant(IncrementSize));
- Hi = DAG.getLoad(NVT, Ch, Ptr, N->getSrcValue(), SVOffset+IncrementSize,
- isVolatile, MinAlign(Alignment, IncrementSize));
-
- // Build a factor node to remember that this load is independent of the
- // other one.
- Ch = DAG.getNode(ISD::TokenFactor, MVT::Other, Lo.getValue(1),
- Hi.getValue(1));
-
- // Handle endianness of the load.
- if (!TLI.isLittleEndian())
- std::swap(Lo, Hi);
- } else if (MVT::getSizeInBits(N->getLoadedVT()) <= MVT::getSizeInBits(NVT)) {
- MVT::ValueType EVT = N->getLoadedVT();
-
- Lo = DAG.getExtLoad(ExtType, NVT, Ch, Ptr, N->getSrcValue(), SVOffset, EVT,
- isVolatile, Alignment);
-
- // Remember the chain.
- Ch = Lo.getValue(1);
-
- if (ExtType == ISD::SEXTLOAD) {
- // The high part is obtained by SRA'ing all but one of the bits of the
- // lo part.
- unsigned LoSize = MVT::getSizeInBits(Lo.getValueType());
- Hi = DAG.getNode(ISD::SRA, NVT, Lo,
- DAG.getConstant(LoSize-1, TLI.getShiftAmountTy()));
- } else if (ExtType == ISD::ZEXTLOAD) {
- // The high part is just a zero.
- Hi = DAG.getConstant(0, NVT);
- } else {
- assert(ExtType == ISD::EXTLOAD && "Unknown extload!");
- // The high part is undefined.
- Hi = DAG.getNode(ISD::UNDEF, NVT);
+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 {
+ DAGTypeLegalizer &DTL;
+ SmallSetVector<SDNode*, 16> &NodesToAnalyze;
+ public:
+ explicit NodeUpdateListener(DAGTypeLegalizer &dtl,
+ SmallSetVector<SDNode*, 16> &nta)
+ : DTL(dtl), NodesToAnalyze(nta) {}
+
+ 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);
}
- } else if (TLI.isLittleEndian()) {
- // Little-endian - low bits are at low addresses.
- Lo = DAG.getLoad(NVT, Ch, Ptr, N->getSrcValue(), SVOffset,
- isVolatile, Alignment);
-
- unsigned ExcessBits =
- MVT::getSizeInBits(N->getLoadedVT()) - MVT::getSizeInBits(NVT);
- MVT::ValueType NEVT = MVT::getIntegerType(ExcessBits);
-
- // Increment the pointer to the other half.
- unsigned IncrementSize = MVT::getSizeInBits(NVT)/8;
- Ptr = DAG.getNode(ISD::ADD, Ptr.getValueType(), Ptr,
- getIntPtrConstant(IncrementSize));
- Hi = DAG.getExtLoad(ExtType, NVT, Ch, Ptr, N->getSrcValue(),
- SVOffset+IncrementSize, NEVT,
- isVolatile, MinAlign(Alignment, IncrementSize));
-
- // Build a factor node to remember that this load is independent of the
- // other one.
- Ch = DAG.getNode(ISD::TokenFactor, MVT::Other, Lo.getValue(1),
- Hi.getValue(1));
- } else {
- // Big-endian - high bits are at low addresses. Favor aligned loads at
- // the cost of some bit-fiddling.
- MVT::ValueType EVT = N->getLoadedVT();
- unsigned EBytes = MVT::getStoreSizeInBits(EVT)/8;
- unsigned IncrementSize = MVT::getSizeInBits(NVT)/8;
- unsigned ExcessBits = (EBytes - IncrementSize)*8;
-
- // Load both the high bits and maybe some of the low bits.
- Hi = DAG.getExtLoad(ExtType, NVT, Ch, Ptr, N->getSrcValue(), SVOffset,
- MVT::getIntegerType(MVT::getSizeInBits(EVT)-ExcessBits),
- isVolatile, Alignment);
-
- // Increment the pointer to the other half.
- Ptr = DAG.getNode(ISD::ADD, Ptr.getValueType(), Ptr,
- getIntPtrConstant(IncrementSize));
- // Load the rest of the low bits.
- Lo = DAG.getExtLoad(ISD::ZEXTLOAD, NVT, Ch, Ptr, N->getSrcValue(),
- SVOffset+IncrementSize, MVT::getIntegerType(ExcessBits),
- isVolatile, MinAlign(Alignment, IncrementSize));
-
- // Build a factor node to remember that this load is independent of the
- // other one.
- Ch = DAG.getNode(ISD::TokenFactor, MVT::Other, Lo.getValue(1),
- Hi.getValue(1));
-
- if (ExcessBits < MVT::getSizeInBits(NVT)) {
- // Transfer low bits from the bottom of Hi to the top of Lo.
- Lo = DAG.getNode(ISD::OR, NVT, Lo,
- DAG.getNode(ISD::SHL, NVT, Hi,
- DAG.getConstant(ExcessBits,
- TLI.getShiftAmountTy())));
- // Move high bits to the right position in Hi.
- Hi = DAG.getNode(ExtType == ISD::SEXTLOAD ? ISD::SRA : ISD::SRL, NVT, Hi,
- DAG.getConstant(MVT::getSizeInBits(NVT) - ExcessBits,
- TLI.getShiftAmountTy()));
- }
- }
-
- // Legalized the chain result - switch anything that used the old chain to
- // use the new one.
- ReplaceValueWith(SDOperand(N, 1), Ch);
-}
-
-void DAGTypeLegalizer::ExpandResult_Logical(SDNode *N,
- SDOperand &Lo, SDOperand &Hi) {
- SDOperand LL, LH, RL, RH;
- GetExpandedOp(N->getOperand(0), LL, LH);
- GetExpandedOp(N->getOperand(1), RL, RH);
- Lo = DAG.getNode(N->getOpcode(), LL.getValueType(), LL, RL);
- Hi = DAG.getNode(N->getOpcode(), LL.getValueType(), LH, RH);
-}
-
-void DAGTypeLegalizer::ExpandResult_BSWAP(SDNode *N,
- SDOperand &Lo, SDOperand &Hi) {
- GetExpandedOp(N->getOperand(0), Hi, Lo); // Note swapped operands.
- Lo = DAG.getNode(ISD::BSWAP, Lo.getValueType(), Lo);
- Hi = DAG.getNode(ISD::BSWAP, Hi.getValueType(), Hi);
-}
-
-void DAGTypeLegalizer::ExpandResult_SELECT(SDNode *N,
- SDOperand &Lo, SDOperand &Hi) {
- SDOperand LL, LH, RL, RH;
- GetExpandedOp(N->getOperand(1), LL, LH);
- GetExpandedOp(N->getOperand(2), RL, RH);
- Lo = DAG.getNode(ISD::SELECT, LL.getValueType(), N->getOperand(0), LL, RL);
-
- assert(N->getOperand(0).getValueType() != MVT::f32 &&
- "FIXME: softfp shouldn't use expand!");
- Hi = DAG.getNode(ISD::SELECT, LL.getValueType(), N->getOperand(0), LH, RH);
-}
-
-void DAGTypeLegalizer::ExpandResult_SELECT_CC(SDNode *N,
- SDOperand &Lo, SDOperand &Hi) {
- SDOperand LL, LH, RL, RH;
- GetExpandedOp(N->getOperand(2), LL, LH);
- GetExpandedOp(N->getOperand(3), RL, RH);
- Lo = DAG.getNode(ISD::SELECT_CC, LL.getValueType(), N->getOperand(0),
- N->getOperand(1), LL, RL, N->getOperand(4));
-
- assert(N->getOperand(0).getValueType() != MVT::f32 &&
- "FIXME: softfp shouldn't use expand!");
- Hi = DAG.getNode(ISD::SELECT_CC, LL.getValueType(), N->getOperand(0),
- N->getOperand(1), LH, RH, N->getOperand(4));
-}
-void DAGTypeLegalizer::ExpandResult_ADDSUB(SDNode *N,
- SDOperand &Lo, SDOperand &Hi) {
- // Expand the subcomponents.
- SDOperand LHSL, LHSH, RHSL, RHSH;
- GetExpandedOp(N->getOperand(0), LHSL, LHSH);
- GetExpandedOp(N->getOperand(1), RHSL, RHSH);
- SDVTList VTList = DAG.getVTList(LHSL.getValueType(), MVT::Flag);
- SDOperand LoOps[2] = { LHSL, RHSL };
- SDOperand HiOps[3] = { LHSH, RHSH };
-
- if (N->getOpcode() == ISD::ADD) {
- Lo = DAG.getNode(ISD::ADDC, VTList, LoOps, 2);
- HiOps[2] = Lo.getValue(1);
- Hi = DAG.getNode(ISD::ADDE, VTList, HiOps, 3);
- } else {
- Lo = DAG.getNode(ISD::SUBC, VTList, LoOps, 2);
- HiOps[2] = Lo.getValue(1);
- Hi = DAG.getNode(ISD::SUBE, VTList, HiOps, 3);
- }
-}
-
-void DAGTypeLegalizer::ExpandResult_ADDSUBC(SDNode *N,
- SDOperand &Lo, SDOperand &Hi) {
- // Expand the subcomponents.
- SDOperand LHSL, LHSH, RHSL, RHSH;
- GetExpandedOp(N->getOperand(0), LHSL, LHSH);
- GetExpandedOp(N->getOperand(1), RHSL, RHSH);
- SDVTList VTList = DAG.getVTList(LHSL.getValueType(), MVT::Flag);
- SDOperand LoOps[2] = { LHSL, RHSL };
- SDOperand HiOps[3] = { LHSH, RHSH };
-
- if (N->getOpcode() == ISD::ADDC) {
- Lo = DAG.getNode(ISD::ADDC, VTList, LoOps, 2);
- HiOps[2] = Lo.getValue(1);
- Hi = DAG.getNode(ISD::ADDE, VTList, HiOps, 3);
- } else {
- Lo = DAG.getNode(ISD::SUBC, VTList, LoOps, 2);
- HiOps[2] = Lo.getValue(1);
- Hi = DAG.getNode(ISD::SUBE, VTList, HiOps, 3);
- }
-
- // Legalized the flag result - switch anything that used the old flag to
- // use the new one.
- ReplaceValueWith(SDOperand(N, 1), Hi.getValue(1));
-}
-
-void DAGTypeLegalizer::ExpandResult_ADDSUBE(SDNode *N,
- SDOperand &Lo, SDOperand &Hi) {
- // Expand the subcomponents.
- SDOperand LHSL, LHSH, RHSL, RHSH;
- GetExpandedOp(N->getOperand(0), LHSL, LHSH);
- GetExpandedOp(N->getOperand(1), RHSL, RHSH);
- SDVTList VTList = DAG.getVTList(LHSL.getValueType(), MVT::Flag);
- SDOperand LoOps[3] = { LHSL, RHSL, N->getOperand(2) };
- SDOperand HiOps[3] = { LHSH, RHSH };
-
- Lo = DAG.getNode(N->getOpcode(), VTList, LoOps, 3);
- HiOps[2] = Lo.getValue(1);
- Hi = DAG.getNode(N->getOpcode(), VTList, HiOps, 3);
-
- // Legalized the flag result - switch anything that used the old flag to
- // use the new one.
- ReplaceValueWith(SDOperand(N, 1), Hi.getValue(1));
-}
-
-void DAGTypeLegalizer::ExpandResult_MUL(SDNode *N,
- SDOperand &Lo, SDOperand &Hi) {
- MVT::ValueType VT = N->getValueType(0);
- MVT::ValueType NVT = TLI.getTypeToTransformTo(VT);
-
- bool HasMULHS = TLI.isOperationLegal(ISD::MULHS, NVT);
- bool HasMULHU = TLI.isOperationLegal(ISD::MULHU, NVT);
- bool HasSMUL_LOHI = TLI.isOperationLegal(ISD::SMUL_LOHI, NVT);
- bool HasUMUL_LOHI = TLI.isOperationLegal(ISD::UMUL_LOHI, NVT);
- if (HasMULHU || HasMULHS || HasUMUL_LOHI || HasSMUL_LOHI) {
- SDOperand LL, LH, RL, RH;
- GetExpandedOp(N->getOperand(0), LL, LH);
- GetExpandedOp(N->getOperand(1), RL, RH);
- unsigned BitSize = MVT::getSizeInBits(NVT);
- unsigned LHSSB = DAG.ComputeNumSignBits(N->getOperand(0));
- unsigned RHSSB = DAG.ComputeNumSignBits(N->getOperand(1));
-
- // FIXME: generalize this to handle other bit sizes
- if (LHSSB == 32 && RHSSB == 32 &&
- DAG.MaskedValueIsZero(N->getOperand(0), 0xFFFFFFFF00000000ULL) &&
- DAG.MaskedValueIsZero(N->getOperand(1), 0xFFFFFFFF00000000ULL)) {
- // The inputs are both zero-extended.
- if (HasUMUL_LOHI) {
- // We can emit a umul_lohi.
- Lo = DAG.getNode(ISD::UMUL_LOHI, DAG.getVTList(NVT, NVT), LL, RL);
- Hi = SDOperand(Lo.Val, 1);
- return;
- }
- if (HasMULHU) {
- // We can emit a mulhu+mul.
- Lo = DAG.getNode(ISD::MUL, NVT, LL, RL);
- Hi = DAG.getNode(ISD::MULHU, NVT, LL, RL);
- return;
- }
+ 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::ReadyToProcess &&
+ N->getNodeId() != DAGTypeLegalizer::Processed &&
+ "Invalid node ID for RAUW deletion!");
+ N->setNodeId(DAGTypeLegalizer::NewNode);
+ NodesToAnalyze.insert(N);
}
- if (LHSSB > BitSize && RHSSB > BitSize) {
- // The input values are both sign-extended.
- if (HasSMUL_LOHI) {
- // We can emit a smul_lohi.
- Lo = DAG.getNode(ISD::SMUL_LOHI, DAG.getVTList(NVT, NVT), LL, RL);
- Hi = SDOperand(Lo.Val, 1);
- return;
- }
- if (HasMULHS) {
- // We can emit a mulhs+mul.
- Lo = DAG.getNode(ISD::MUL, NVT, LL, RL);
- Hi = DAG.getNode(ISD::MULHS, NVT, LL, RL);
- return;
- }
- }
- if (HasUMUL_LOHI) {
- // Lo,Hi = umul LHS, RHS.
- SDOperand UMulLOHI = DAG.getNode(ISD::UMUL_LOHI,
- DAG.getVTList(NVT, NVT), LL, RL);
- Lo = UMulLOHI;
- Hi = UMulLOHI.getValue(1);
- RH = DAG.getNode(ISD::MUL, NVT, LL, RH);
- LH = DAG.getNode(ISD::MUL, NVT, LH, RL);
- Hi = DAG.getNode(ISD::ADD, NVT, Hi, RH);
- Hi = DAG.getNode(ISD::ADD, NVT, Hi, LH);
- return;
- }
- }
-
- abort();
-#if 0 // FIXME!
- // If nothing else, we can make a libcall.
- Lo = ExpandLibCall(TLI.getLibcallName(RTLIB::MUL_I64), N,
- false/*sign irrelevant*/, Hi);
-#endif
-}
-
-
-void DAGTypeLegalizer::ExpandResult_Shift(SDNode *N,
- SDOperand &Lo, SDOperand &Hi) {
- MVT::ValueType VT = N->getValueType(0);
-
- // If we can emit an efficient shift operation, do so now. Check to see if
- // the RHS is a constant.
- if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N->getOperand(1)))
- return ExpandShiftByConstant(N, CN->getValue(), Lo, Hi);
-
- // If we can determine that the high bit of the shift is zero or one, even if
- // the low bits are variable, emit this shift in an optimized form.
- if (ExpandShiftWithKnownAmountBit(N, Lo, Hi))
- return;
-
- // If this target supports shift_PARTS, use it. First, map to the _PARTS opc.
- unsigned PartsOpc;
- if (N->getOpcode() == ISD::SHL)
- PartsOpc = ISD::SHL_PARTS;
- else if (N->getOpcode() == ISD::SRL)
- PartsOpc = ISD::SRL_PARTS;
- else {
- assert(N->getOpcode() == ISD::SRA && "Unknown shift!");
- PartsOpc = ISD::SRA_PARTS;
- }
-
- // Next check to see if the target supports this SHL_PARTS operation or if it
- // will custom expand it.
- MVT::ValueType NVT = TLI.getTypeToTransformTo(VT);
- TargetLowering::LegalizeAction Action = TLI.getOperationAction(PartsOpc, NVT);
- if ((Action == TargetLowering::Legal && TLI.isTypeLegal(NVT)) ||
- Action == TargetLowering::Custom) {
- // Expand the subcomponents.
- SDOperand LHSL, LHSH;
- GetExpandedOp(N->getOperand(0), LHSL, LHSH);
-
- SDOperand Ops[] = { LHSL, LHSH, N->getOperand(1) };
- MVT::ValueType VT = LHSL.getValueType();
- Lo = DAG.getNode(PartsOpc, DAG.getNodeValueTypes(VT, VT), 2, Ops, 3);
- Hi = Lo.getValue(1);
- return;
- }
-
- abort();
-#if 0 // FIXME!
- // Otherwise, emit a libcall.
- unsigned RuntimeCode = ; // SRL -> SRL_I64 etc.
- bool Signed = ;
- Lo = ExpandLibCall(TLI.getLibcallName(RTLIB::SRL_I64), N,
- false/*lshr is unsigned*/, Hi);
-#endif
-}
-
-
-/// ExpandShiftByConstant - N is a shift by a value that needs to be expanded,
-/// and the shift amount is a constant 'Amt'. Expand the operation.
-void DAGTypeLegalizer::ExpandShiftByConstant(SDNode *N, unsigned Amt,
- SDOperand &Lo, SDOperand &Hi) {
- // Expand the incoming operand to be shifted, so that we have its parts
- SDOperand InL, InH;
- GetExpandedOp(N->getOperand(0), InL, InH);
-
- MVT::ValueType NVT = InL.getValueType();
- unsigned VTBits = MVT::getSizeInBits(N->getValueType(0));
- unsigned NVTBits = MVT::getSizeInBits(NVT);
- MVT::ValueType ShTy = N->getOperand(1).getValueType();
-
- if (N->getOpcode() == ISD::SHL) {
- if (Amt > VTBits) {
- Lo = Hi = DAG.getConstant(0, NVT);
- } else if (Amt > NVTBits) {
- Lo = DAG.getConstant(0, NVT);
- Hi = DAG.getNode(ISD::SHL, NVT, InL, DAG.getConstant(Amt-NVTBits,ShTy));
- } else if (Amt == NVTBits) {
- Lo = DAG.getConstant(0, NVT);
- Hi = InL;
- } else {
- Lo = DAG.getNode(ISD::SHL, NVT, InL, DAG.getConstant(Amt, ShTy));
- Hi = DAG.getNode(ISD::OR, NVT,
- DAG.getNode(ISD::SHL, NVT, InH,
- DAG.getConstant(Amt, ShTy)),
- DAG.getNode(ISD::SRL, NVT, InL,
- DAG.getConstant(NVTBits-Amt, ShTy)));
- }
- return;
- }
-
- if (N->getOpcode() == ISD::SRL) {
- if (Amt > VTBits) {
- Lo = DAG.getConstant(0, NVT);
- Hi = DAG.getConstant(0, NVT);
- } else if (Amt > NVTBits) {
- Lo = DAG.getNode(ISD::SRL, NVT, InH, DAG.getConstant(Amt-NVTBits,ShTy));
- Hi = DAG.getConstant(0, NVT);
- } else if (Amt == NVTBits) {
- Lo = InH;
- Hi = DAG.getConstant(0, NVT);
- } else {
- Lo = DAG.getNode(ISD::OR, NVT,
- DAG.getNode(ISD::SRL, NVT, InL,
- DAG.getConstant(Amt, ShTy)),
- DAG.getNode(ISD::SHL, NVT, InH,
- DAG.getConstant(NVTBits-Amt, ShTy)));
- Hi = DAG.getNode(ISD::SRL, NVT, InH, DAG.getConstant(Amt, ShTy));
- }
- return;
- }
-
- assert(N->getOpcode() == ISD::SRA && "Unknown shift!");
- if (Amt > VTBits) {
- Hi = Lo = DAG.getNode(ISD::SRA, NVT, InH,
- DAG.getConstant(NVTBits-1, ShTy));
- } else if (Amt > NVTBits) {
- Lo = DAG.getNode(ISD::SRA, NVT, InH,
- DAG.getConstant(Amt-NVTBits, ShTy));
- Hi = DAG.getNode(ISD::SRA, NVT, InH,
- DAG.getConstant(NVTBits-1, ShTy));
- } else if (Amt == NVTBits) {
- Lo = InH;
- Hi = DAG.getNode(ISD::SRA, NVT, InH,
- DAG.getConstant(NVTBits-1, ShTy));
- } else {
- Lo = DAG.getNode(ISD::OR, NVT,
- DAG.getNode(ISD::SRL, NVT, InL,
- DAG.getConstant(Amt, ShTy)),
- DAG.getNode(ISD::SHL, NVT, InH,
- DAG.getConstant(NVTBits-Amt, ShTy)));
- Hi = DAG.getNode(ISD::SRA, NVT, InH, DAG.getConstant(Amt, ShTy));
- }
+ };
}
-/// ExpandShiftWithKnownAmountBit - Try to determine whether we can simplify
-/// this shift based on knowledge of the high bit of the shift amount. If we
-/// can tell this, we know that it is >= 32 or < 32, without knowing the actual
-/// shift amount.
-bool DAGTypeLegalizer::
-ExpandShiftWithKnownAmountBit(SDNode *N, SDOperand &Lo, SDOperand &Hi) {
- MVT::ValueType NVT = TLI.getTypeToTransformTo(N->getValueType(0));
- unsigned NVTBits = MVT::getSizeInBits(NVT);
- assert(!(NVTBits & (NVTBits - 1)) &&
- "Expanded integer type size not a power of two!");
-
- uint64_t HighBitMask = NVTBits, KnownZero, KnownOne;
- DAG.ComputeMaskedBits(N->getOperand(1), HighBitMask, KnownZero, KnownOne);
-
- // If we don't know anything about the high bit, exit.
- if (((KnownZero|KnownOne) & HighBitMask) == 0)
- return false;
- // Get the incoming operand to be shifted.
- SDOperand InL, InH;
- GetExpandedOp(N->getOperand(0), InL, InH);
- SDOperand Amt = N->getOperand(1);
-
- // If we know that the high bit of the shift amount is one, then we can do
- // this as a couple of simple shifts.
- if (KnownOne & HighBitMask) {
- // Mask out the high bit, which we know is set.
- Amt = DAG.getNode(ISD::AND, Amt.getValueType(), Amt,
- DAG.getConstant(NVTBits-1, Amt.getValueType()));
-
- switch (N->getOpcode()) {
- default: assert(0 && "Unknown shift");
- case ISD::SHL:
- Lo = DAG.getConstant(0, NVT); // Low part is zero.
- Hi = DAG.getNode(ISD::SHL, NVT, InL, Amt); // High part from Lo part.
- return true;
- case ISD::SRL:
- Hi = DAG.getConstant(0, NVT); // Hi part is zero.
- Lo = DAG.getNode(ISD::SRL, NVT, InH, Amt); // Lo part from Hi part.
- return true;
- case ISD::SRA:
- Hi = DAG.getNode(ISD::SRA, NVT, InH, // Sign extend high part.
- DAG.getConstant(NVTBits-1, Amt.getValueType()));
- Lo = DAG.getNode(ISD::SRA, NVT, InH, Amt); // Lo part from Hi part.
- return true;
- }
- }
-
- // If we know that the high bit of the shift amount is zero, then we can do
- // this as a couple of simple shifts.
- assert((KnownZero & HighBitMask) && "Bad mask computation above");
-
- // Compute 32-amt.
- SDOperand Amt2 = DAG.getNode(ISD::SUB, Amt.getValueType(),
- DAG.getConstant(NVTBits, Amt.getValueType()),
- Amt);
- unsigned Op1, Op2;
- switch (N->getOpcode()) {
- default: assert(0 && "Unknown shift");
- case ISD::SHL: Op1 = ISD::SHL; Op2 = ISD::SRL; break;
- case ISD::SRL:
- case ISD::SRA: Op1 = ISD::SRL; Op2 = ISD::SHL; break;
- }
-
- Lo = DAG.getNode(N->getOpcode(), NVT, InL, Amt);
- Hi = DAG.getNode(ISD::OR, NVT,
- DAG.getNode(Op1, NVT, InH, Amt),
- DAG.getNode(Op2, NVT, InL, Amt2));
- return true;
-}
+/// ReplaceValueWithHelper - Internal helper for ReplaceValueWith. Updates the
+/// DAG causing any uses of From to use To instead, but without expunging From
+/// or recording the replacement in ReplacedValues. Do not call directly unless
+/// you really know what you are doing!
+void DAGTypeLegalizer::ReplaceValueWithHelper(SDValue From, SDValue To) {
+ assert(From.getNode() != To.getNode() && "Potential legalization loop!");
-//===----------------------------------------------------------------------===//
-// Result Vector Scalarization: <1 x ty> -> ty.
-//===----------------------------------------------------------------------===//
+ // If expansion produced new nodes, make sure they are properly marked.
+ AnalyzeNewValue(To); // Expunges To.
+ // Anything that used the old node should now use the new one. Note that this
+ // can potentially cause recursive merging.
+ SmallSetVector<SDNode*, 16> NodesToAnalyze;
+ NodeUpdateListener NUL(*this, NodesToAnalyze);
+ DAG.ReplaceAllUsesOfValueWith(From, To, &NUL);
+
+ // 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;
-void DAGTypeLegalizer::ScalarizeResult(SDNode *N, unsigned ResNo) {
- DEBUG(cerr << "Scalarize node result " << ResNo << ": "; N->dump(&DAG);
- cerr << "\n");
- SDOperand R = SDOperand();
-
- // FIXME: Custom lowering for scalarization?
-#if 0
- // See if the target wants to custom expand this node.
- if (TLI.getOperationAction(N->getOpcode(), N->getValueType(0)) ==
- TargetLowering::Custom) {
- // If the target wants to, allow it to lower this itself.
- if (SDNode *P = TLI.ExpandOperationResult(N, DAG)) {
- // Everything that once used N now uses P. We are guaranteed that the
- // result value types of N and the result value types of P match.
- ReplaceNodeWith(N, P);
- return;
+ // 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);
+ }
+ // The original node continues to exist in the DAG, marked NewNode.
}
}
-#endif
-
- switch (N->getOpcode()) {
- default:
-#ifndef NDEBUG
- cerr << "ScalarizeResult #" << ResNo << ": ";
- N->dump(&DAG); cerr << "\n";
-#endif
- assert(0 && "Do not know how to scalarize the result of this operator!");
- abort();
-
- case ISD::UNDEF: R = ScalarizeRes_UNDEF(N); break;
- case ISD::LOAD: R = ScalarizeRes_LOAD(cast<LoadSDNode>(N)); break;
- case ISD::ADD:
- case ISD::FADD:
- case ISD::SUB:
- case ISD::FSUB:
- case ISD::MUL:
- case ISD::FMUL:
- case ISD::SDIV:
- case ISD::UDIV:
- case ISD::FDIV:
- case ISD::SREM:
- case ISD::UREM:
- case ISD::FREM:
- case ISD::FPOW:
- case ISD::AND:
- case ISD::OR:
- case ISD::XOR: R = ScalarizeRes_BinOp(N); break;
- case ISD::FNEG:
- case ISD::FABS:
- case ISD::FSQRT:
- case ISD::FSIN:
- case ISD::FCOS: R = ScalarizeRes_UnaryOp(N); break;
- case ISD::FPOWI: R = ScalarizeRes_FPOWI(N); break;
- case ISD::BUILD_VECTOR: R = N->getOperand(0); break;
- case ISD::INSERT_VECTOR_ELT: R = N->getOperand(1); break;
- case ISD::VECTOR_SHUFFLE: R = ScalarizeRes_VECTOR_SHUFFLE(N); break;
- case ISD::BIT_CONVERT: R = ScalarizeRes_BIT_CONVERT(N); break;
- case ISD::SELECT: R = ScalarizeRes_SELECT(N); break;
- }
-
- // If R is null, the sub-method took care of registering the resul.
- if (R.Val)
- SetScalarizedOp(SDOperand(N, ResNo), R);
}
-SDOperand DAGTypeLegalizer::ScalarizeRes_UNDEF(SDNode *N) {
- return DAG.getNode(ISD::UNDEF, MVT::getVectorElementType(N->getValueType(0)));
-}
+/// ReplaceValueWith - The specified value was legalized to the specified other
+/// 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()->getNodeId() == ReadyToProcess &&
+ "Only the node being processed may be remapped!");
-SDOperand DAGTypeLegalizer::ScalarizeRes_LOAD(LoadSDNode *N) {
- SDOperand Result = DAG.getLoad(MVT::getVectorElementType(N->getValueType(0)),
- N->getChain(), N->getBasePtr(),
- N->getSrcValue(), N->getSrcValueOffset(),
- N->isVolatile(), N->getAlignment());
-
- // Legalized the chain result - switch anything that used the old chain to
- // use the new one.
- ReplaceValueWith(SDOperand(N, 1), Result.getValue(1));
- return Result;
-}
+ // If expansion produced new nodes, make sure they are properly marked.
+ ExpungeNode(From.getNode());
+ AnalyzeNewValue(To); // Expunges To.
-SDOperand DAGTypeLegalizer::ScalarizeRes_BinOp(SDNode *N) {
- SDOperand LHS = GetScalarizedOp(N->getOperand(0));
- SDOperand RHS = GetScalarizedOp(N->getOperand(1));
- return DAG.getNode(N->getOpcode(), LHS.getValueType(), LHS, RHS);
-}
+ // The old node may still be present in a map like ExpandedIntegers or
+ // PromotedIntegers. Inform maps about the replacement.
+ ReplacedValues[From] = To;
-SDOperand DAGTypeLegalizer::ScalarizeRes_UnaryOp(SDNode *N) {
- SDOperand Op = GetScalarizedOp(N->getOperand(0));
- return DAG.getNode(N->getOpcode(), Op.getValueType(), Op);
+ // Do the replacement.
+ ReplaceValueWithHelper(From, To);
}
-SDOperand DAGTypeLegalizer::ScalarizeRes_FPOWI(SDNode *N) {
- SDOperand Op = GetScalarizedOp(N->getOperand(0));
- return DAG.getNode(ISD::FPOWI, Op.getValueType(), Op, N->getOperand(1));
-}
+void DAGTypeLegalizer::SetPromotedInteger(SDValue Op, SDValue Result) {
+ AnalyzeNewValue(Result);
-SDOperand DAGTypeLegalizer::ScalarizeRes_VECTOR_SHUFFLE(SDNode *N) {
- // Figure out if the scalar is the LHS or RHS and return it.
- SDOperand EltNum = N->getOperand(2).getOperand(0);
- unsigned Op = cast<ConstantSDNode>(EltNum)->getValue() != 0;
- return GetScalarizedOp(N->getOperand(Op));
+ SDValue &OpEntry = PromotedIntegers[Op];
+ assert(OpEntry.getNode() == 0 && "Node is already promoted!");
+ OpEntry = Result;
}
-SDOperand DAGTypeLegalizer::ScalarizeRes_BIT_CONVERT(SDNode *N) {
- MVT::ValueType NewVT = MVT::getVectorElementType(N->getValueType(0));
- return DAG.getNode(ISD::BIT_CONVERT, NewVT, N->getOperand(0));
-}
+void DAGTypeLegalizer::SetSoftenedFloat(SDValue Op, SDValue Result) {
+ AnalyzeNewValue(Result);
-SDOperand DAGTypeLegalizer::ScalarizeRes_SELECT(SDNode *N) {
- SDOperand LHS = GetScalarizedOp(N->getOperand(1));
- return DAG.getNode(ISD::SELECT, LHS.getValueType(), N->getOperand(0), LHS,
- GetScalarizedOp(N->getOperand(2)));
+ SDValue &OpEntry = SoftenedFloats[Op];
+ assert(OpEntry.getNode() == 0 && "Node is already converted to integer!");
+ OpEntry = Result;
}
+void DAGTypeLegalizer::SetScalarizedVector(SDValue Op, SDValue Result) {
+ AnalyzeNewValue(Result);
-//===----------------------------------------------------------------------===//
-// Operand Promotion
-//===----------------------------------------------------------------------===//
-
-/// PromoteOperand - This method is called when the specified operand of the
-/// specified node is found to need promotion. At this point, all of the result
-/// types of the node are known to be legal, but other operands of the node may
-/// need promotion or expansion as well as the specified one.
-bool DAGTypeLegalizer::PromoteOperand(SDNode *N, unsigned OpNo) {
- DEBUG(cerr << "Promote node operand: "; N->dump(&DAG); cerr << "\n");
- SDOperand Res;
- switch (N->getOpcode()) {
- default:
-#ifndef NDEBUG
- cerr << "PromoteOperand Op #" << OpNo << ": ";
- N->dump(&DAG); cerr << "\n";
-#endif
- assert(0 && "Do not know how to promote this operator's operand!");
- abort();
-
- case ISD::ANY_EXTEND: Res = PromoteOperand_ANY_EXTEND(N); break;
- case ISD::ZERO_EXTEND: Res = PromoteOperand_ZERO_EXTEND(N); break;
- case ISD::SIGN_EXTEND: Res = PromoteOperand_SIGN_EXTEND(N); break;
- case ISD::TRUNCATE: Res = PromoteOperand_TRUNCATE(N); break;
- case ISD::FP_EXTEND: Res = PromoteOperand_FP_EXTEND(N); break;
- case ISD::FP_ROUND: Res = PromoteOperand_FP_ROUND(N); break;
- case ISD::SINT_TO_FP:
- case ISD::UINT_TO_FP: Res = PromoteOperand_INT_TO_FP(N); break;
-
- case ISD::SELECT: Res = PromoteOperand_SELECT(N, OpNo); break;
- case ISD::BRCOND: Res = PromoteOperand_BRCOND(N, OpNo); break;
- case ISD::BR_CC: Res = PromoteOperand_BR_CC(N, OpNo); break;
- case ISD::SETCC: Res = PromoteOperand_SETCC(N, OpNo); break;
-
- case ISD::STORE: Res = PromoteOperand_STORE(cast<StoreSDNode>(N),
- OpNo); break;
- case ISD::MEMSET:
- case ISD::MEMCPY:
- case ISD::MEMMOVE: Res = HandleMemIntrinsic(N); break;
- }
-
- // If the result is null, the sub-method took care of registering results etc.
- if (!Res.Val) return false;
- // If the result is N, the sub-method updated N in place.
- if (Res.Val == N) {
- // Mark N as new and remark N and its operands. This allows us to correctly
- // revisit N if it needs another step of promotion and allows us to visit
- // any new operands to N.
- N->setNodeId(NewNode);
- MarkNewNodes(N);
- return true;
- }
-
- assert(Res.getValueType() == N->getValueType(0) && N->getNumValues() == 1 &&
- "Invalid operand expansion");
-
- ReplaceValueWith(SDOperand(N, 0), Res);
- return false;
-}
-
-SDOperand DAGTypeLegalizer::PromoteOperand_ANY_EXTEND(SDNode *N) {
- SDOperand Op = GetPromotedOp(N->getOperand(0));
- return DAG.getNode(ISD::ANY_EXTEND, N->getValueType(0), Op);
+ SDValue &OpEntry = ScalarizedVectors[Op];
+ assert(OpEntry.getNode() == 0 && "Node is already scalarized!");
+ OpEntry = Result;
}
-SDOperand DAGTypeLegalizer::PromoteOperand_ZERO_EXTEND(SDNode *N) {
- SDOperand Op = GetPromotedOp(N->getOperand(0));
- Op = DAG.getNode(ISD::ANY_EXTEND, N->getValueType(0), Op);
- return DAG.getZeroExtendInReg(Op, N->getOperand(0).getValueType());
+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;
}
-SDOperand DAGTypeLegalizer::PromoteOperand_SIGN_EXTEND(SDNode *N) {
- SDOperand Op = GetPromotedOp(N->getOperand(0));
- Op = DAG.getNode(ISD::ANY_EXTEND, N->getValueType(0), Op);
- return DAG.getNode(ISD::SIGN_EXTEND_INREG, Op.getValueType(),
- Op, DAG.getValueType(N->getOperand(0).getValueType()));
-}
+void DAGTypeLegalizer::SetExpandedInteger(SDValue Op, SDValue Lo,
+ SDValue Hi) {
+ // Lo/Hi may have been newly allocated, if so, add nodeid's as relevant.
+ AnalyzeNewValue(Lo);
+ AnalyzeNewValue(Hi);
-SDOperand DAGTypeLegalizer::PromoteOperand_TRUNCATE(SDNode *N) {
- SDOperand Op = GetPromotedOp(N->getOperand(0));
- return DAG.getNode(ISD::TRUNCATE, N->getValueType(0), Op);
+ // Remember that this is the result of the node.
+ std::pair<SDValue, SDValue> &Entry = ExpandedIntegers[Op];
+ assert(Entry.first.getNode() == 0 && "Node already expanded");
+ Entry.first = Lo;
+ Entry.second = Hi;
}
-SDOperand DAGTypeLegalizer::PromoteOperand_FP_EXTEND(SDNode *N) {
- SDOperand Op = GetPromotedOp(N->getOperand(0));
- return DAG.getNode(ISD::FP_EXTEND, N->getValueType(0), Op);
+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;
}
-SDOperand DAGTypeLegalizer::PromoteOperand_FP_ROUND(SDNode *N) {
- SDOperand Op = GetPromotedOp(N->getOperand(0));
- return DAG.getNode(ISD::FP_ROUND, N->getValueType(0), Op);
-}
+void DAGTypeLegalizer::SetExpandedFloat(SDValue Op, SDValue Lo,
+ SDValue Hi) {
+ // Lo/Hi may have been newly allocated, if so, add nodeid's as relevant.
+ AnalyzeNewValue(Lo);
+ AnalyzeNewValue(Hi);
-SDOperand DAGTypeLegalizer::PromoteOperand_INT_TO_FP(SDNode *N) {
- SDOperand In = GetPromotedOp(N->getOperand(0));
- MVT::ValueType OpVT = N->getOperand(0).getValueType();
- if (N->getOpcode() == ISD::UINT_TO_FP)
- In = DAG.getZeroExtendInReg(In, OpVT);
- else
- In = DAG.getNode(ISD::SIGN_EXTEND_INREG, In.getValueType(),
- In, DAG.getValueType(OpVT));
-
- return DAG.UpdateNodeOperands(SDOperand(N, 0), In);
+ // Remember that this is the result of the node.
+ std::pair<SDValue, SDValue> &Entry = ExpandedFloats[Op];
+ assert(Entry.first.getNode() == 0 && "Node already expanded");
+ Entry.first = Lo;
+ Entry.second = Hi;
}
-SDOperand DAGTypeLegalizer::PromoteOperand_SELECT(SDNode *N, unsigned OpNo) {
- assert(OpNo == 0 && "Only know how to promote condition");
- SDOperand Cond = GetPromotedOp(N->getOperand(0)); // Promote the condition.
-
- // The top bits of the promoted condition are not necessarily zero, ensure
- // that the value is properly zero extended.
- if (!DAG.MaskedValueIsZero(Cond,
- MVT::getIntVTBitMask(Cond.getValueType())^1)) {
- Cond = DAG.getZeroExtendInReg(Cond, MVT::i1);
- MarkNewNodes(Cond.Val);
- }
-
- // The chain (Op#0) and basic block destination (Op#2) are always legal types.
- return DAG.UpdateNodeOperands(SDOperand(N, 0), Cond, N->getOperand(1),
- N->getOperand(2));
+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;
}
-SDOperand DAGTypeLegalizer::PromoteOperand_BRCOND(SDNode *N, unsigned OpNo) {
- assert(OpNo == 1 && "only know how to promote condition");
- SDOperand Cond = GetPromotedOp(N->getOperand(1)); // Promote the condition.
-
- // The top bits of the promoted condition are not necessarily zero, ensure
- // that the value is properly zero extended.
- if (!DAG.MaskedValueIsZero(Cond,
- MVT::getIntVTBitMask(Cond.getValueType())^1)) {
- Cond = DAG.getZeroExtendInReg(Cond, MVT::i1);
- MarkNewNodes(Cond.Val);
- }
-
- // The chain (Op#0) and basic block destination (Op#2) are always legal types.
- return DAG.UpdateNodeOperands(SDOperand(N, 0), N->getOperand(0), Cond,
- N->getOperand(2));
-}
+void DAGTypeLegalizer::SetSplitVector(SDValue Op, SDValue Lo,
+ SDValue Hi) {
+ // Lo/Hi may have been newly allocated, if so, add nodeid's as relevant.
+ AnalyzeNewValue(Lo);
+ AnalyzeNewValue(Hi);
-SDOperand DAGTypeLegalizer::PromoteOperand_BR_CC(SDNode *N, unsigned OpNo) {
- assert(OpNo == 2 && "Don't know how to promote this operand");
-
- SDOperand LHS = N->getOperand(2);
- SDOperand RHS = N->getOperand(3);
- PromoteSetCCOperands(LHS, RHS, cast<CondCodeSDNode>(N->getOperand(1))->get());
-
- // The chain (Op#0), CC (#1) and basic block destination (Op#4) are always
- // legal types.
- return DAG.UpdateNodeOperands(SDOperand(N, 0), N->getOperand(0),
- N->getOperand(1), LHS, RHS, N->getOperand(4));
+ // 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;
}
-SDOperand DAGTypeLegalizer::PromoteOperand_SETCC(SDNode *N, unsigned OpNo) {
- assert(OpNo == 0 && "Don't know how to promote this operand");
-
- SDOperand LHS = N->getOperand(0);
- SDOperand RHS = N->getOperand(1);
- PromoteSetCCOperands(LHS, RHS, cast<CondCodeSDNode>(N->getOperand(2))->get());
-
- // The CC (#2) is always legal.
- return DAG.UpdateNodeOperands(SDOperand(N, 0), LHS, RHS, N->getOperand(2));
-}
+void DAGTypeLegalizer::SetWidenedVector(SDValue Op, SDValue Result) {
+ AnalyzeNewValue(Result);
-/// PromoteSetCCOperands - Promote the operands of a comparison. This code is
-/// shared among BR_CC, SELECT_CC, and SETCC handlers.
-void DAGTypeLegalizer::PromoteSetCCOperands(SDOperand &NewLHS,SDOperand &NewRHS,
- ISD::CondCode CCCode) {
- MVT::ValueType VT = NewLHS.getValueType();
-
- // Get the promoted values.
- NewLHS = GetPromotedOp(NewLHS);
- NewRHS = GetPromotedOp(NewRHS);
-
- // If this is an FP compare, the operands have already been extended.
- if (!MVT::isInteger(NewLHS.getValueType()))
- return;
-
- // Otherwise, we have to insert explicit sign or zero extends. Note
- // that we could insert sign extends for ALL conditions, but zero extend
- // is cheaper on many machines (an AND instead of two shifts), so prefer
- // it.
- switch (CCCode) {
- default: assert(0 && "Unknown integer comparison!");
- case ISD::SETEQ:
- case ISD::SETNE:
- case ISD::SETUGE:
- case ISD::SETUGT:
- case ISD::SETULE:
- case ISD::SETULT:
- // ALL of these operations will work if we either sign or zero extend
- // the operands (including the unsigned comparisons!). Zero extend is
- // usually a simpler/cheaper operation, so prefer it.
- NewLHS = DAG.getZeroExtendInReg(NewLHS, VT);
- NewRHS = DAG.getZeroExtendInReg(NewRHS, VT);
- return;
- case ISD::SETGE:
- case ISD::SETGT:
- case ISD::SETLT:
- case ISD::SETLE:
- NewLHS = DAG.getNode(ISD::SIGN_EXTEND_INREG, NewLHS.getValueType(), NewLHS,
- DAG.getValueType(VT));
- NewRHS = DAG.getNode(ISD::SIGN_EXTEND_INREG, NewRHS.getValueType(), NewRHS,
- DAG.getValueType(VT));
- return;
- }
+ SDValue &OpEntry = WidenedVectors[Op];
+ assert(OpEntry.getNode() == 0 && "Node already widened!");
+ OpEntry = Result;
}
-SDOperand DAGTypeLegalizer::PromoteOperand_STORE(StoreSDNode *N, unsigned OpNo){
- SDOperand Ch = N->getChain(), Ptr = N->getBasePtr();
- int SVOffset = N->getSrcValueOffset();
- unsigned Alignment = N->getAlignment();
- bool isVolatile = N->isVolatile();
-
- SDOperand Val = GetPromotedOp(N->getValue()); // Get promoted value.
-
- assert(!N->isTruncatingStore() && "Cannot promote this store operand!");
-
- // Truncate the value and store the result.
- return DAG.getTruncStore(Ch, Val, Ptr, N->getSrcValue(),
- SVOffset, N->getStoredVT(),
- isVolatile, Alignment);
+// Set to ignore result
+void DAGTypeLegalizer::SetIgnoredNodeResult(SDNode* N) {
+ IgnoredNodesResultsSet.insert(N);
}
-
//===----------------------------------------------------------------------===//
-// Operand Expansion
+// Utilities.
//===----------------------------------------------------------------------===//
-/// ExpandOperand - This method is called when the specified operand of the
-/// specified node is found to need expansion. At this point, all of the result
-/// types of the node are known to be legal, but other operands of the node may
-/// need promotion or expansion as well as the specified one.
-bool DAGTypeLegalizer::ExpandOperand(SDNode *N, unsigned OpNo) {
- DEBUG(cerr << "Expand node operand: "; N->dump(&DAG); cerr << "\n");
- SDOperand Res(0, 0);
-
- if (TLI.getOperationAction(N->getOpcode(), N->getValueType(0)) ==
- TargetLowering::Custom)
- Res = TLI.LowerOperation(SDOperand(N, 0), DAG);
-
- if (Res.Val == 0) {
- switch (N->getOpcode()) {
- default:
- #ifndef NDEBUG
- cerr << "ExpandOperand Op #" << OpNo << ": ";
- N->dump(&DAG); cerr << "\n";
- #endif
- assert(0 && "Do not know how to expand this operator's operand!");
- abort();
-
- case ISD::TRUNCATE: Res = ExpandOperand_TRUNCATE(N); break;
- case ISD::BIT_CONVERT: Res = ExpandOperand_BIT_CONVERT(N); break;
-
- case ISD::SINT_TO_FP:
- Res = ExpandOperand_SINT_TO_FP(N->getOperand(0), N->getValueType(0));
- break;
- case ISD::UINT_TO_FP:
- Res = ExpandOperand_UINT_TO_FP(N->getOperand(0), N->getValueType(0));
- break;
- case ISD::EXTRACT_ELEMENT: Res = ExpandOperand_EXTRACT_ELEMENT(N); break;
- case ISD::SETCC: Res = ExpandOperand_SETCC(N); break;
-
- case ISD::STORE:
- Res = ExpandOperand_STORE(cast<StoreSDNode>(N), OpNo);
- break;
- case ISD::MEMSET:
- case ISD::MEMCPY:
- case ISD::MEMMOVE: Res = HandleMemIntrinsic(N); break;
- }
- }
-
- // If the result is null, the sub-method took care of registering results etc.
- if (!Res.Val) return false;
- // If the result is N, the sub-method updated N in place. Check to see if any
- // operands are new, and if so, mark them.
- if (Res.Val == N) {
- // Mark N as new and remark N and its operands. This allows us to correctly
- // revisit N if it needs another step of promotion and allows us to visit
- // any new operands to N.
- N->setNodeId(NewNode);
- MarkNewNodes(N);
- return true;
- }
-
- assert(Res.getValueType() == N->getValueType(0) && N->getNumValues() == 1 &&
- "Invalid operand expansion");
-
- ReplaceValueWith(SDOperand(N, 0), Res);
- return false;
-}
-
-SDOperand DAGTypeLegalizer::ExpandOperand_TRUNCATE(SDNode *N) {
- SDOperand InL, InH;
- GetExpandedOp(N->getOperand(0), InL, InH);
- // Just truncate the low part of the source.
- return DAG.getNode(ISD::TRUNCATE, N->getValueType(0), InL);
+/// BitConvertToInteger - Convert to an integer of the same size.
+SDValue DAGTypeLegalizer::BitConvertToInteger(SDValue Op) {
+ unsigned BitWidth = Op.getValueType().getSizeInBits();
+ return DAG.getNode(ISD::BIT_CONVERT, Op.getDebugLoc(),
+ MVT::getIntegerVT(BitWidth), Op);
}
-SDOperand DAGTypeLegalizer::ExpandOperand_BIT_CONVERT(SDNode *N) {
- return CreateStackStoreLoad(N->getOperand(0), N->getValueType(0));
-}
+SDValue DAGTypeLegalizer::CreateStackStoreLoad(SDValue Op,
+ MVT 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.
+ SDValue Store = DAG.getStore(DAG.getEntryNode(), dl, Op, StackPtr, NULL, 0);
+ // Result is a load from the stack slot.
+ return DAG.getLoad(DestVT, dl, Store, StackPtr, NULL, 0);
+}
+
+/// CustomLowerResults - 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::CustomLowerResults(SDNode *N, MVT VT,
+ bool LegalizeResult) {
+ // See if the target wants to custom lower this node.
+ if (TLI.getOperationAction(N->getOpcode(), VT) != TargetLowering::Custom)
+ return false;
-SDOperand DAGTypeLegalizer::ExpandOperand_SINT_TO_FP(SDOperand Source,
- MVT::ValueType DestTy) {
- // We know the destination is legal, but that the input needs to be expanded.
- assert(Source.getValueType() == MVT::i64 && "Only handle expand from i64!");
-
- // Check to see if the target has a custom way to lower this. If so, use it.
- switch (TLI.getOperationAction(ISD::SINT_TO_FP, Source.getValueType())) {
- default: assert(0 && "This action not implemented for this operation!");
- case TargetLowering::Legal:
- case TargetLowering::Expand:
- break; // This case is handled below.
- case TargetLowering::Custom:
- SDOperand NV = TLI.LowerOperation(DAG.getNode(ISD::SINT_TO_FP, DestTy,
- Source), DAG);
- if (NV.Val) return NV;
- break; // The target lowered this.
- }
-
- RTLIB::Libcall LC;
- if (DestTy == MVT::f32)
- LC = RTLIB::SINTTOFP_I64_F32;
- else {
- assert(DestTy == MVT::f64 && "Unknown fp value type!");
- LC = RTLIB::SINTTOFP_I64_F64;
- }
-
- assert(0 && "FIXME: no libcalls yet!");
- abort();
-#if 0
- assert(TLI.getLibcallName(LC) && "Don't know how to expand this SINT_TO_FP!");
- Source = DAG.getNode(ISD::SINT_TO_FP, DestTy, Source);
- SDOperand UnusedHiPart;
- return ExpandLibCall(TLI.getLibcallName(LC), Source.Val, true, UnusedHiPart);
-#endif
-}
+ SmallVector<SDValue, 8> Results;
+ if (LegalizeResult)
+ TLI.ReplaceNodeResults(N, Results, DAG);
+ else
+ TLI.LowerOperationWrapper(N, Results, DAG);
-SDOperand DAGTypeLegalizer::ExpandOperand_UINT_TO_FP(SDOperand Source,
- MVT::ValueType DestTy) {
- // We know the destination is legal, but that the input needs to be expanded.
- assert(getTypeAction(Source.getValueType()) == Expand &&
- "This is not an expansion!");
- assert(Source.getValueType() == MVT::i64 && "Only handle expand from i64!");
-
- // If this is unsigned, and not supported, first perform the conversion to
- // signed, then adjust the result if the sign bit is set.
- SDOperand SignedConv = ExpandOperand_SINT_TO_FP(Source, DestTy);
-
- // The 64-bit value loaded will be incorrectly if the 'sign bit' of the
- // incoming integer is set. To handle this, we dynamically test to see if
- // it is set, and, if so, add a fudge factor.
- SDOperand Lo, Hi;
- GetExpandedOp(Source, Lo, Hi);
-
- SDOperand SignSet = DAG.getSetCC(TLI.getSetCCResultTy(), Hi,
- DAG.getConstant(0, Hi.getValueType()),
- ISD::SETLT);
- SDOperand Zero = getIntPtrConstant(0), Four = getIntPtrConstant(4);
- SDOperand CstOffset = DAG.getNode(ISD::SELECT, Zero.getValueType(),
- SignSet, Four, Zero);
- uint64_t FF = 0x5f800000ULL;
- if (TLI.isLittleEndian()) FF <<= 32;
- Constant *FudgeFactor = ConstantInt::get(Type::Int64Ty, FF);
-
- SDOperand CPIdx = DAG.getConstantPool(FudgeFactor, TLI.getPointerTy());
- CPIdx = DAG.getNode(ISD::ADD, TLI.getPointerTy(), CPIdx, CstOffset);
- SDOperand FudgeInReg;
- if (DestTy == MVT::f32)
- FudgeInReg = DAG.getLoad(MVT::f32, DAG.getEntryNode(), CPIdx, NULL, 0);
- else if (MVT::getSizeInBits(DestTy) > MVT::getSizeInBits(MVT::f32))
- // FIXME: Avoid the extend by construction the right constantpool?
- FudgeInReg = DAG.getExtLoad(ISD::EXTLOAD, DestTy, DAG.getEntryNode(),
- CPIdx, NULL, 0, MVT::f32);
- else
- assert(0 && "Unexpected conversion");
-
- return DAG.getNode(ISD::FADD, DestTy, SignedConv, FudgeInReg);
-}
+ if (Results.empty())
+ // The target didn't want to custom lower it after all.
+ return false;
-SDOperand DAGTypeLegalizer::ExpandOperand_EXTRACT_ELEMENT(SDNode *N) {
- SDOperand Lo, Hi;
- GetExpandedOp(N->getOperand(0), Lo, Hi);
- return cast<ConstantSDNode>(N->getOperand(1))->getValue() ? Hi : Lo;
+ // 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;
}
-SDOperand DAGTypeLegalizer::ExpandOperand_SETCC(SDNode *N) {
- SDOperand NewLHS = N->getOperand(0), NewRHS = N->getOperand(1);
- ISD::CondCode CCCode = cast<CondCodeSDNode>(N->getOperand(2))->get();
- ExpandSetCCOperands(NewLHS, NewRHS, CCCode);
-
- // If ExpandSetCCOperands returned a scalar, use it.
- if (NewRHS.Val == 0) return NewLHS;
-
- // Otherwise, update N to have the operands specified.
- return DAG.UpdateNodeOperands(SDOperand(N, 0), NewLHS, NewRHS,
- DAG.getCondCode(CCCode));
+/// 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(MVT InVT, MVT &LoVT, MVT &HiVT) {
+ if (!InVT.isVector()) {
+ LoVT = HiVT = TLI.getTypeToTransformTo(InVT);
+ } else {
+ MVT NewEltVT = InVT.getVectorElementType();
+ unsigned NumElements = InVT.getVectorNumElements();
+ if ((NumElements & (NumElements-1)) == 0) { // Simple power of two vector.
+ NumElements >>= 1;
+ LoVT = HiVT = MVT::getVectorVT(NewEltVT, NumElements);
+ } else { // Non-power-of-two vectors.
+ unsigned NewNumElts_Lo = 1 << Log2_32(NumElements);
+ unsigned NewNumElts_Hi = NumElements - NewNumElts_Lo;
+ LoVT = MVT::getVectorVT(NewEltVT, NewNumElts_Lo);
+ HiVT = MVT::getVectorVT(NewEltVT, NewNumElts_Hi);
+ }
+ }
}
-/// ExpandSetCCOperands - Expand the operands of a comparison. This code is
-/// shared among BR_CC, SELECT_CC, and SETCC handlers.
-void DAGTypeLegalizer::ExpandSetCCOperands(SDOperand &NewLHS, SDOperand &NewRHS,
- ISD::CondCode &CCCode) {
- SDOperand LHSLo, LHSHi, RHSLo, RHSHi;
- GetExpandedOp(NewLHS, LHSLo, LHSHi);
- GetExpandedOp(NewRHS, RHSLo, RHSHi);
-
- MVT::ValueType VT = NewLHS.getValueType();
- if (VT == MVT::f32 || VT == MVT::f64) {
- assert(0 && "FIXME: softfp not implemented yet! should be promote not exp");
- }
-
- if (VT == MVT::ppcf128) {
- // FIXME: This generated code sucks. We want to generate
- // FCMP crN, hi1, hi2
- // BNE crN, L:
- // FCMP crN, lo1, lo2
- // The following can be improved, but not that much.
- SDOperand Tmp1, Tmp2, Tmp3;
- Tmp1 = DAG.getSetCC(TLI.getSetCCResultTy(), LHSHi, RHSHi, ISD::SETEQ);
- Tmp2 = DAG.getSetCC(TLI.getSetCCResultTy(), LHSLo, RHSLo, CCCode);
- Tmp3 = DAG.getNode(ISD::AND, Tmp1.getValueType(), Tmp1, Tmp2);
- Tmp1 = DAG.getSetCC(TLI.getSetCCResultTy(), LHSHi, RHSHi, ISD::SETNE);
- Tmp2 = DAG.getSetCC(TLI.getSetCCResultTy(), LHSHi, RHSHi, CCCode);
- Tmp1 = DAG.getNode(ISD::AND, Tmp1.getValueType(), Tmp1, Tmp2);
- NewLHS = DAG.getNode(ISD::OR, Tmp1.getValueType(), Tmp1, Tmp3);
- NewRHS = SDOperand(); // LHS is the result, not a compare.
- return;
+SDValue DAGTypeLegalizer::GetVectorElementPointer(SDValue VecPtr, MVT 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();
+ MVT LVT = Lo.getValueType();
+ MVT HVT = Hi.getValueType();
+ MVT NVT = MVT::getIntegerVT(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);
}
-
-
- if (CCCode == ISD::SETEQ || CCCode == ISD::SETNE) {
- if (RHSLo == RHSHi)
- if (ConstantSDNode *RHSCST = dyn_cast<ConstantSDNode>(RHSLo))
- if (RHSCST->isAllOnesValue()) {
- // Equality comparison to -1.
- NewLHS = DAG.getNode(ISD::AND, LHSLo.getValueType(), LHSLo, LHSHi);
- NewRHS = RHSLo;
- return;
- }
-
- NewLHS = DAG.getNode(ISD::XOR, LHSLo.getValueType(), LHSLo, RHSLo);
- NewRHS = DAG.getNode(ISD::XOR, LHSLo.getValueType(), LHSHi, RHSHi);
- NewLHS = DAG.getNode(ISD::OR, NewLHS.getValueType(), NewLHS, NewRHS);
- NewRHS = DAG.getConstant(0, NewLHS.getValueType());
- return;
+ 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, MVT 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().getTypeForMVT();
+ Entry.isSExt = isSigned;
+ Entry.isZExt = !isSigned;
+ Args.push_back(Entry);
}
-
- // If this is a comparison of the sign bit, just look at the top part.
- // X > -1, x < 0
- if (ConstantSDNode *CST = dyn_cast<ConstantSDNode>(NewRHS))
- if ((CCCode == ISD::SETLT && CST->getValue() == 0) || // X < 0
- (CCCode == ISD::SETGT && CST->isAllOnesValue())) { // X > -1
- NewLHS = LHSHi;
- NewRHS = RHSHi;
- return;
- }
-
- // FIXME: This generated code sucks.
- ISD::CondCode LowCC;
- switch (CCCode) {
- default: assert(0 && "Unknown integer setcc!");
- case ISD::SETLT:
- case ISD::SETULT: LowCC = ISD::SETULT; break;
- case ISD::SETGT:
- case ISD::SETUGT: LowCC = ISD::SETUGT; break;
- case ISD::SETLE:
- case ISD::SETULE: LowCC = ISD::SETULE; break;
- case ISD::SETGE:
- case ISD::SETUGE: LowCC = ISD::SETUGE; break;
+ SDValue Callee = DAG.getExternalSymbol(TLI.getLibcallName(LC),
+ TLI.getPointerTy());
+
+ const Type *RetTy = RetVT.getTypeForMVT();
+ std::pair<SDValue,SDValue> CallInfo =
+ TLI.LowerCallTo(DAG.getEntryNode(), RetTy, isSigned, !isSigned, false,
+ false, CallingConv::C, false, Callee, Args, DAG, dl);
+ return CallInfo.first;
+}
+
+/// 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, MVT 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;
}
-
- // Tmp1 = lo(op1) < lo(op2) // Always unsigned comparison
- // Tmp2 = hi(op1) < hi(op2) // Signedness depends on operands
- // dest = hi(op1) == hi(op2) ? Tmp1 : Tmp2;
-
- // NOTE: on targets without efficient SELECT of bools, we can always use
- // this identity: (B1 ? B2 : B3) --> (B1 & B2)|(!B1&B3)
- TargetLowering::DAGCombinerInfo DagCombineInfo(DAG, false, true, NULL);
- SDOperand Tmp1, Tmp2;
- Tmp1 = TLI.SimplifySetCC(TLI.getSetCCResultTy(), LHSLo, RHSLo, LowCC,
- false, DagCombineInfo);
- if (!Tmp1.Val)
- Tmp1 = DAG.getSetCC(TLI.getSetCCResultTy(), LHSLo, RHSLo, LowCC);
- Tmp2 = TLI.SimplifySetCC(TLI.getSetCCResultTy(), LHSHi, RHSHi,
- CCCode, false, DagCombineInfo);
- if (!Tmp2.Val)
- Tmp2 = DAG.getNode(ISD::SETCC, TLI.getSetCCResultTy(), LHSHi, RHSHi,
- DAG.getCondCode(CCCode));
-
- ConstantSDNode *Tmp1C = dyn_cast<ConstantSDNode>(Tmp1.Val);
- ConstantSDNode *Tmp2C = dyn_cast<ConstantSDNode>(Tmp2.Val);
- if ((Tmp1C && Tmp1C->getValue() == 0) ||
- (Tmp2C && Tmp2C->getValue() == 0 &&
- (CCCode == ISD::SETLE || CCCode == ISD::SETGE ||
- CCCode == ISD::SETUGE || CCCode == ISD::SETULE)) ||
- (Tmp2C && Tmp2C->getValue() == 1 &&
- (CCCode == ISD::SETLT || CCCode == ISD::SETGT ||
- CCCode == ISD::SETUGT || CCCode == ISD::SETULT))) {
- // low part is known false, returns high part.
- // For LE / GE, if high part is known false, ignore the low part.
- // For LT / GT, if high part is known true, ignore the low part.
- NewLHS = Tmp2;
- NewRHS = SDOperand();
- return;
}
-
- NewLHS = TLI.SimplifySetCC(TLI.getSetCCResultTy(), LHSHi, RHSHi,
- ISD::SETEQ, false, DagCombineInfo);
- if (!NewLHS.Val)
- NewLHS = DAG.getSetCC(TLI.getSetCCResultTy(), LHSHi, RHSHi, ISD::SETEQ);
- NewLHS = DAG.getNode(ISD::SELECT, Tmp1.getValueType(),
- NewLHS, Tmp1, Tmp2);
- NewRHS = SDOperand();
+ return DAG.getNode(ExtendCode, dl, VT, Bool);
}
-SDOperand DAGTypeLegalizer::ExpandOperand_STORE(StoreSDNode *N, unsigned OpNo) {
- assert(OpNo == 1 && "Can only expand the stored value so far");
-
- MVT::ValueType VT = N->getOperand(1).getValueType();
- MVT::ValueType NVT = TLI.getTypeToTransformTo(VT);
- SDOperand Ch = N->getChain();
- SDOperand Ptr = N->getBasePtr();
- int SVOffset = N->getSrcValueOffset();
- unsigned Alignment = N->getAlignment();
- bool isVolatile = N->isVolatile();
- SDOperand Lo, Hi;
-
- assert(!(MVT::getSizeInBits(NVT) & 7) && "Expanded type not byte sized!");
-
- if (!N->isTruncatingStore()) {
- unsigned IncrementSize = 0;
-
- // If this is a vector type, then we have to calculate the increment as
- // the product of the element size in bytes, and the number of elements
- // in the high half of the vector.
- if (MVT::isVector(N->getValue().getValueType())) {
- assert(0 && "Vectors not supported yet");
- #if 0
- SDNode *InVal = ST->getValue().Val;
- unsigned NumElems = MVT::getVectorNumElements(InVal->getValueType(0));
- MVT::ValueType EVT = MVT::getVectorElementType(InVal->getValueType(0));
-
- // Figure out if there is a simple type corresponding to this Vector
- // type. If so, convert to the vector type.
- MVT::ValueType TVT = MVT::getVectorType(EVT, NumElems);
- if (TLI.isTypeLegal(TVT)) {
- // Turn this into a normal store of the vector type.
- Tmp3 = LegalizeOp(Node->getOperand(1));
- Result = DAG.getStore(Tmp1, Tmp3, Tmp2, ST->getSrcValue(),
- SVOffset, isVolatile, Alignment);
- Result = LegalizeOp(Result);
- break;
- } else if (NumElems == 1) {
- // Turn this into a normal store of the scalar type.
- Tmp3 = ScalarizeVectorOp(Node->getOperand(1));
- Result = DAG.getStore(Tmp1, Tmp3, Tmp2, ST->getSrcValue(),
- SVOffset, isVolatile, Alignment);
- // The scalarized value type may not be legal, e.g. it might require
- // promotion or expansion. Relegalize the scalar store.
- return LegalizeOp(Result);
- } else {
- SplitVectorOp(Node->getOperand(1), Lo, Hi);
- IncrementSize = NumElems/2 * MVT::getSizeInBits(EVT)/8;
- }
- #endif
- } else {
- GetExpandedOp(N->getValue(), Lo, Hi);
- IncrementSize = Hi.Val ? MVT::getSizeInBits(Hi.getValueType())/8 : 0;
-
- if (!TLI.isLittleEndian())
- std::swap(Lo, Hi);
- }
-
- Lo = DAG.getStore(Ch, Lo, Ptr, N->getSrcValue(),
- SVOffset, isVolatile, Alignment);
-
- assert(Hi.Val && "FIXME: int <-> float should be handled with promote!");
- #if 0
- if (Hi.Val == NULL) {
- // Must be int <-> float one-to-one expansion.
- return Lo;
- }
- #endif
-
- Ptr = DAG.getNode(ISD::ADD, Ptr.getValueType(), Ptr,
- getIntPtrConstant(IncrementSize));
- assert(isTypeLegal(Ptr.getValueType()) && "Pointers must be legal!");
- Hi = DAG.getStore(Ch, Hi, Ptr, N->getSrcValue(), SVOffset+IncrementSize,
- isVolatile, MinAlign(Alignment, IncrementSize));
- return DAG.getNode(ISD::TokenFactor, MVT::Other, Lo, Hi);
- } else if (MVT::getSizeInBits(N->getStoredVT()) <= MVT::getSizeInBits(NVT)) {
- GetExpandedOp(N->getValue(), Lo, Hi);
- return DAG.getTruncStore(Ch, Lo, Ptr, N->getSrcValue(), SVOffset,
- N->getStoredVT(), isVolatile, Alignment);
- } else if (TLI.isLittleEndian()) {
- // Little-endian - low bits are at low addresses.
- GetExpandedOp(N->getValue(), Lo, Hi);
-
- Lo = DAG.getStore(Ch, Lo, Ptr, N->getSrcValue(), SVOffset,
- isVolatile, Alignment);
-
- unsigned ExcessBits =
- MVT::getSizeInBits(N->getStoredVT()) - MVT::getSizeInBits(NVT);
- MVT::ValueType NEVT = MVT::getIntegerType(ExcessBits);
-
- // Increment the pointer to the other half.
- unsigned IncrementSize = MVT::getSizeInBits(NVT)/8;
- Ptr = DAG.getNode(ISD::ADD, Ptr.getValueType(), Ptr,
- getIntPtrConstant(IncrementSize));
- Hi = DAG.getTruncStore(Ch, Hi, Ptr, N->getSrcValue(),
- SVOffset+IncrementSize, NEVT,
- isVolatile, MinAlign(Alignment, IncrementSize));
- return DAG.getNode(ISD::TokenFactor, MVT::Other, Lo, Hi);
- } else {
- // Big-endian - high bits are at low addresses. Favor aligned stores at
- // the cost of some bit-fiddling.
- GetExpandedOp(N->getValue(), Lo, Hi);
-
- MVT::ValueType EVT = N->getStoredVT();
- unsigned EBytes = MVT::getStoreSizeInBits(EVT)/8;
- unsigned IncrementSize = MVT::getSizeInBits(NVT)/8;
- unsigned ExcessBits = (EBytes - IncrementSize)*8;
- MVT::ValueType HiVT =
- MVT::getIntegerType(MVT::getSizeInBits(EVT)-ExcessBits);
-
- if (ExcessBits < MVT::getSizeInBits(NVT)) {
- // Transfer high bits from the top of Lo to the bottom of Hi.
- Hi = DAG.getNode(ISD::SHL, NVT, Hi,
- DAG.getConstant(MVT::getSizeInBits(NVT) - ExcessBits,
- TLI.getShiftAmountTy()));
- Hi = DAG.getNode(ISD::OR, NVT, Hi,
- DAG.getNode(ISD::SRL, NVT, Lo,
- DAG.getConstant(ExcessBits,
- TLI.getShiftAmountTy())));
- }
-
- // Store both the high bits and maybe some of the low bits.
- Hi = DAG.getTruncStore(Ch, Hi, Ptr, N->getSrcValue(),
- SVOffset, HiVT, isVolatile, Alignment);
-
- // Increment the pointer to the other half.
- Ptr = DAG.getNode(ISD::ADD, Ptr.getValueType(), Ptr,
- getIntPtrConstant(IncrementSize));
- // Store the lowest ExcessBits bits in the second half.
- Lo = DAG.getTruncStore(Ch, Lo, Ptr, N->getSrcValue(),
- SVOffset+IncrementSize,
- MVT::getIntegerType(ExcessBits),
- isVolatile, MinAlign(Alignment, IncrementSize));
- return DAG.getNode(ISD::TokenFactor, MVT::Other, Lo, Hi);
- }
-}
-
-//===----------------------------------------------------------------------===//
-// Operand Vector Scalarization <1 x ty> -> ty.
-//===----------------------------------------------------------------------===//
-
-bool DAGTypeLegalizer::ScalarizeOperand(SDNode *N, unsigned OpNo) {
- DEBUG(cerr << "Scalarize node operand " << OpNo << ": "; N->dump(&DAG);
- cerr << "\n");
- SDOperand Res(0, 0);
-
- // FIXME: Should we support custom lowering for scalarization?
-#if 0
- if (TLI.getOperationAction(N->getOpcode(), N->getValueType(0)) ==
- TargetLowering::Custom)
- Res = TLI.LowerOperation(SDOperand(N, 0), DAG);
-#endif
-
- if (Res.Val == 0) {
- switch (N->getOpcode()) {
- default:
-#ifndef NDEBUG
- cerr << "ScalarizeOperand Op #" << OpNo << ": ";
- N->dump(&DAG); cerr << "\n";
-#endif
- assert(0 && "Do not know how to scalarize this operator's operand!");
- abort();
-
- case ISD::EXTRACT_VECTOR_ELT:
- Res = ScalarizeOp_EXTRACT_VECTOR_ELT(N, OpNo);
- break;
- }
- }
-
- // If the result is null, the sub-method took care of registering results etc.
- if (!Res.Val) return false;
-
- // If the result is N, the sub-method updated N in place. Check to see if any
- // operands are new, and if so, mark them.
- if (Res.Val == N) {
- // Mark N as new and remark N and its operands. This allows us to correctly
- // revisit N if it needs another step of promotion and allows us to visit
- // any new operands to N.
- N->setNodeId(NewNode);
- MarkNewNodes(N);
- return true;
- }
-
- assert(Res.getValueType() == N->getValueType(0) && N->getNumValues() == 1 &&
- "Invalid operand expansion");
-
- ReplaceValueWith(SDOperand(N, 0), Res);
- return false;
+/// SplitInteger - Return the lower LoVT bits of Op in Lo and the upper HiVT
+/// bits in Hi.
+void DAGTypeLegalizer::SplitInteger(SDValue Op,
+ MVT LoVT, MVT 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);
}
-/// ScalarizeOp_EXTRACT_VECTOR_ELT - If the input is a vector that needs to be
-/// scalarized, it must be <1 x ty>, just return the operand, ignoring the
-/// index.
-SDOperand DAGTypeLegalizer::ScalarizeOp_EXTRACT_VECTOR_ELT(SDNode *N,
- unsigned OpNo) {
- return GetScalarizedOp(N->getOperand(0));
+/// 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) {
+ MVT HalfVT = MVT::getIntegerVT(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() {
- DAGTypeLegalizer(*this).run();
+bool SelectionDAG::LegalizeTypes() {
+ return DAGTypeLegalizer(*this).run();
}
projects / oota-llvm.git / blobdiff