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//===-- LegalizeTypes.cpp - Common code for DAG type legalizer ------------===//
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// The LLVM Compiler Infrastructure
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//===----------------------------------------------------------------------===//
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// This file implements the SelectionDAG::LegalizeTypes method. It transforms
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// an arbitrary well-formed SelectionDAG to only consist of legal types. This
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// is common code shared among the LegalizeTypes*.cpp files.
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//===----------------------------------------------------------------------===//
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#include "LegalizeTypes.h"
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#include "llvm/CallingConv.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/ADT/SetVector.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/raw_ostream.h"
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EnableExpensiveChecks("enable-legalize-types-checking", cl::Hidden);
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/// PerformExpensiveChecks - Do extensive, expensive, sanity checking.
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void DAGTypeLegalizer::PerformExpensiveChecks() {
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// If a node is not processed, then none of its values should be mapped by any
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// of PromotedIntegers, ExpandedIntegers, ..., ReplacedValues.
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// If a node is processed, then each value with an illegal type must be mapped
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// by exactly one of PromotedIntegers, ExpandedIntegers, ..., ReplacedValues.
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// Values with a legal type may be mapped by ReplacedValues, but not by any of
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// Note that these invariants may not hold momentarily when processing a node:
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// the node being processed may be put in a map before being marked Processed.
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// Note that it is possible to have nodes marked NewNode in the DAG. This can
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// occur in two ways. Firstly, a node may be created during legalization but
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// never passed to the legalization core. This is usually due to the implicit
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// folding that occurs when using the DAG.getNode operators. Secondly, a new
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// node may be passed to the legalization core, but when analyzed may morph
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// into a different node, leaving the original node as a NewNode in the DAG.
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// A node may morph if one of its operands changes during analysis. Whether
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// it actually morphs or not depends on whether, after updating its operands,
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// it is equivalent to an existing node: if so, it morphs into that existing
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// node (CSE). An operand can change during analysis if the operand is a new
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// node that morphs, or it is a processed value that was mapped to some other
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// value (as recorded in ReplacedValues) in which case the operand is turned
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// into that other value. If a node morphs then the node it morphed into will
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// be used instead of it for legalization, however the original node continues
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// to live on in the DAG.
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// The conclusion is that though there may be nodes marked NewNode in the DAG,
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// all uses of such nodes are also marked NewNode: the result is a fungus of
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// NewNodes growing on top of the useful nodes, and perhaps using them, but
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// If a value is mapped by ReplacedValues, then it must have no uses, except
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// by nodes marked NewNode (see above).
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// The final node obtained by mapping by ReplacedValues is not marked NewNode.
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// Note that ReplacedValues should be applied iteratively.
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// Note that the ReplacedValues map may also map deleted nodes (by iterating
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// over the DAG we never dereference deleted nodes). This means that it may
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// also map nodes marked NewNode if the deallocated memory was reallocated as
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// another node, and that new node was not seen by the LegalizeTypes machinery
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// (for example because it was created but not used). In general, we cannot
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// distinguish between new nodes and deleted nodes.
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SmallVector<SDNode*, 16> NewNodes;
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for (SelectionDAG::allnodes_iterator I = DAG.allnodes_begin(),
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E = DAG.allnodes_end(); I != E; ++I) {
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// Remember nodes marked NewNode - they are subject to extra checking below.
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if (I->getNodeId() == NewNode)
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NewNodes.push_back(I);
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for (unsigned i = 0, e = I->getNumValues(); i != e; ++i) {
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if (ReplacedValues.find(Res) != ReplacedValues.end()) {
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// Check that remapped values are only used by nodes marked NewNode.
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for (SDNode::use_iterator UI = I->use_begin(), UE = I->use_end();
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if (UI.getUse().getResNo() == i)
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assert(UI->getNodeId() == NewNode &&
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"Remapped value has non-trivial use!");
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// Check that the final result of applying ReplacedValues is not
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SDValue NewVal = ReplacedValues[Res];
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DenseMap<SDValue, SDValue>::iterator I = ReplacedValues.find(NewVal);
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while (I != ReplacedValues.end()) {
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I = ReplacedValues.find(NewVal);
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assert(NewVal.getNode()->getNodeId() != NewNode &&
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"ReplacedValues maps to a new node!");
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if (PromotedIntegers.find(Res) != PromotedIntegers.end())
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if (SoftenedFloats.find(Res) != SoftenedFloats.end())
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if (ScalarizedVectors.find(Res) != ScalarizedVectors.end())
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if (ExpandedIntegers.find(Res) != ExpandedIntegers.end())
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if (ExpandedFloats.find(Res) != ExpandedFloats.end())
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if (SplitVectors.find(Res) != SplitVectors.end())
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if (WidenedVectors.find(Res) != WidenedVectors.end())
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if (I->getNodeId() != Processed) {
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// Since we allow ReplacedValues to map deleted nodes, it may map nodes
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// marked NewNode too, since a deleted node may have been reallocated as
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// another node that has not been seen by the LegalizeTypes machinery.
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if ((I->getNodeId() == NewNode && Mapped > 1) ||
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(I->getNodeId() != NewNode && Mapped != 0)) {
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dbgs() << "Unprocessed value in a map!";
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} else if (isTypeLegal(Res.getValueType()) || IgnoreNodeResults(I)) {
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dbgs() << "Value with legal type was transformed!";
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dbgs() << "Processed value not in any map!";
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} else if (Mapped & (Mapped - 1)) {
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dbgs() << "Value in multiple maps!";
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dbgs() << " ReplacedValues";
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dbgs() << " PromotedIntegers";
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dbgs() << " SoftenedFloats";
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dbgs() << " ScalarizedVectors";
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dbgs() << " ExpandedIntegers";
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dbgs() << " ExpandedFloats";
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dbgs() << " SplitVectors";
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dbgs() << " WidenedVectors";
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// Checked that NewNodes are only used by other NewNodes.
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for (unsigned i = 0, e = NewNodes.size(); i != e; ++i) {
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SDNode *N = NewNodes[i];
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for (SDNode::use_iterator UI = N->use_begin(), UE = N->use_end();
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assert(UI->getNodeId() == NewNode && "NewNode used by non-NewNode!");
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/// run - This is the main entry point for the type legalizer. This does a
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/// top-down traversal of the dag, legalizing types as it goes. Returns "true"
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/// if it made any changes.
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bool DAGTypeLegalizer::run() {
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bool Changed = false;
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// Create a dummy node (which is not added to allnodes), that adds a reference
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// to the root node, preventing it from being deleted, and tracking any
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// changes of the root.
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HandleSDNode Dummy(DAG.getRoot());
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Dummy.setNodeId(Unanalyzed);
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// The root of the dag may dangle to deleted nodes until the type legalizer is
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// done. Set it to null to avoid confusion.
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DAG.setRoot(SDValue());
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// Walk all nodes in the graph, assigning them a NodeId of 'ReadyToProcess'
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// (and remembering them) if they are leaves and assigning 'Unanalyzed' if
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for (SelectionDAG::allnodes_iterator I = DAG.allnodes_begin(),
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E = DAG.allnodes_end(); I != E; ++I) {
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if (I->getNumOperands() == 0) {
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I->setNodeId(ReadyToProcess);
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Worklist.push_back(I);
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I->setNodeId(Unanalyzed);
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// Now that we have a set of nodes to process, handle them all.
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while (!Worklist.empty()) {
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if (EnableExpensiveChecks)
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PerformExpensiveChecks();
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SDNode *N = Worklist.back();
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assert(N->getNodeId() == ReadyToProcess &&
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"Node should be ready if on worklist!");
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if (IgnoreNodeResults(N))
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// Scan the values produced by the node, checking to see if any result
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// types are illegal.
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for (unsigned i = 0, NumResults = N->getNumValues(); i < NumResults; ++i) {
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EVT ResultVT = N->getValueType(i);
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switch (getTypeAction(ResultVT)) {
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assert(false && "Unknown action!");
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// The following calls must take care of *all* of the node's results,
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// not just the illegal result they were passed (this includes results
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// with a legal type). Results can be remapped using ReplaceValueWith,
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// or their promoted/expanded/etc values registered in PromotedIntegers,
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// ExpandedIntegers etc.
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PromoteIntegerResult(N, i);
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ExpandIntegerResult(N, i);
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SoftenFloatResult(N, i);
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ExpandFloatResult(N, i);
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case ScalarizeVector:
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ScalarizeVectorResult(N, i);
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SplitVectorResult(N, i);
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WidenVectorResult(N, i);
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// Scan the operand list for the node, handling any nodes with operands that
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unsigned NumOperands = N->getNumOperands();
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bool NeedsReanalyzing = false;
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for (i = 0; i != NumOperands; ++i) {
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if (IgnoreNodeResults(N->getOperand(i).getNode()))
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EVT OpVT = N->getOperand(i).getValueType();
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switch (getTypeAction(OpVT)) {
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assert(false && "Unknown action!");
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// The following calls must either replace all of the node's results
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// using ReplaceValueWith, and return "false"; or update the node's
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// operands in place, and return "true".
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NeedsReanalyzing = PromoteIntegerOperand(N, i);
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NeedsReanalyzing = ExpandIntegerOperand(N, i);
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NeedsReanalyzing = SoftenFloatOperand(N, i);
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NeedsReanalyzing = ExpandFloatOperand(N, i);
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case ScalarizeVector:
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NeedsReanalyzing = ScalarizeVectorOperand(N, i);
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NeedsReanalyzing = SplitVectorOperand(N, i);
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NeedsReanalyzing = WidenVectorOperand(N, i);
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// The sub-method updated N in place. Check to see if any operands are new,
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// and if so, mark them. If the node needs revisiting, don't add all users
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// to the worklist etc.
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if (NeedsReanalyzing) {
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assert(N->getNodeId() == ReadyToProcess && "Node ID recalculated?");
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N->setNodeId(NewNode);
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// Recompute the NodeId and correct processed operands, adding the node to
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// the worklist if ready.
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SDNode *M = AnalyzeNewNode(N);
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// The node didn't morph - nothing special to do, it will be revisited.
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// The node morphed - this is equivalent to legalizing by replacing every
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// value of N with the corresponding value of M. So do that now.
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assert(N->getNumValues() == M->getNumValues() &&
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"Node morphing changed the number of results!");
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for (unsigned i = 0, e = N->getNumValues(); i != e; ++i)
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// Replacing the value takes care of remapping the new value.
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ReplaceValueWith(SDValue(N, i), SDValue(M, i));
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assert(N->getNodeId() == NewNode && "Unexpected node state!");
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// The node continues to live on as part of the NewNode fungus that
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// grows on top of the useful nodes. Nothing more needs to be done
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// with it - move on to the next node.
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if (i == NumOperands) {
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DEBUG(dbgs() << "Legally typed node: "; N->dump(&DAG); dbgs() << "\n");
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// If we reach here, the node was processed, potentially creating new nodes.
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// Mark it as processed and add its users to the worklist as appropriate.
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assert(N->getNodeId() == ReadyToProcess && "Node ID recalculated?");
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N->setNodeId(Processed);
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for (SDNode::use_iterator UI = N->use_begin(), E = N->use_end();
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int NodeId = User->getNodeId();
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// This node has two options: it can either be a new node or its Node ID
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// may be a count of the number of operands it has that are not ready.
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User->setNodeId(NodeId-1);
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// If this was the last use it was waiting on, add it to the ready list.
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if (NodeId-1 == ReadyToProcess)
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Worklist.push_back(User);
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// If this is an unreachable new node, then ignore it. If it ever becomes
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// reachable by being used by a newly created node then it will be handled
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// by AnalyzeNewNode.
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if (NodeId == NewNode)
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// Otherwise, this node is new: this is the first operand of it that
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// became ready. Its new NodeId is the number of operands it has minus 1
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// (as this node is now processed).
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assert(NodeId == Unanalyzed && "Unknown node ID!");
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User->setNodeId(User->getNumOperands() - 1);
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// If the node only has a single operand, it is now ready.
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if (User->getNumOperands() == 1)
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Worklist.push_back(User);
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if (EnableExpensiveChecks)
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PerformExpensiveChecks();
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// If the root changed (e.g. it was a dead load) update the root.
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DAG.setRoot(Dummy.getValue());
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// Remove dead nodes. This is important to do for cleanliness but also before
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// the checking loop below. Implicit folding by the DAG.getNode operators and
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// node morphing can cause unreachable nodes to be around with their flags set
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DAG.RemoveDeadNodes();
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// In a debug build, scan all the nodes to make sure we found them all. This
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// ensures that there are no cycles and that everything got processed.
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for (SelectionDAG::allnodes_iterator I = DAG.allnodes_begin(),
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E = DAG.allnodes_end(); I != E; ++I) {
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// Check that all result types are legal.
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if (!IgnoreNodeResults(I))
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for (unsigned i = 0, NumVals = I->getNumValues(); i < NumVals; ++i)
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if (!isTypeLegal(I->getValueType(i))) {
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dbgs() << "Result type " << i << " illegal!\n";
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// Check that all operand types are legal.
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for (unsigned i = 0, NumOps = I->getNumOperands(); i < NumOps; ++i)
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if (!IgnoreNodeResults(I->getOperand(i).getNode()) &&
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!isTypeLegal(I->getOperand(i).getValueType())) {
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dbgs() << "Operand type " << i << " illegal!\n";
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if (I->getNodeId() != Processed) {
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if (I->getNodeId() == NewNode)
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dbgs() << "New node not analyzed?\n";
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else if (I->getNodeId() == Unanalyzed)
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dbgs() << "Unanalyzed node not noticed?\n";
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else if (I->getNodeId() > 0)
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dbgs() << "Operand not processed?\n";
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else if (I->getNodeId() == ReadyToProcess)
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dbgs() << "Not added to worklist?\n";
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I->dump(&DAG); dbgs() << "\n";
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/// AnalyzeNewNode - The specified node is the root of a subtree of potentially
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/// new nodes. Correct any processed operands (this may change the node) and
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/// calculate the NodeId. If the node itself changes to a processed node, it
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/// is not remapped - the caller needs to take care of this.
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/// Returns the potentially changed node.
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SDNode *DAGTypeLegalizer::AnalyzeNewNode(SDNode *N) {
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// If this was an existing node that is already done, we're done.
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if (N->getNodeId() != NewNode && N->getNodeId() != Unanalyzed)
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// Remove any stale map entries.
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// Okay, we know that this node is new. Recursively walk all of its operands
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// to see if they are new also. The depth of this walk is bounded by the size
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// of the new tree that was constructed (usually 2-3 nodes), so we don't worry
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// about revisiting of nodes.
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// As we walk the operands, keep track of the number of nodes that are
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// processed. If non-zero, this will become the new nodeid of this node.
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// Operands may morph when they are analyzed. If so, the node will be
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// updated after all operands have been analyzed. Since this is rare,
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// the code tries to minimize overhead in the non-morphing case.
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SmallVector<SDValue, 8> NewOps;
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unsigned NumProcessed = 0;
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for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
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SDValue OrigOp = N->getOperand(i);
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AnalyzeNewValue(Op); // Op may morph.
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if (Op.getNode()->getNodeId() == Processed)
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if (!NewOps.empty()) {
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// Some previous operand changed. Add this one to the list.
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NewOps.push_back(Op);
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} else if (Op != OrigOp) {
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// This is the first operand to change - add all operands so far.
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NewOps.insert(NewOps.end(), N->op_begin(), N->op_begin() + i);
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NewOps.push_back(Op);
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// Some operands changed - update the node.
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if (!NewOps.empty()) {
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SDNode *M = DAG.UpdateNodeOperands(SDValue(N, 0), &NewOps[0],
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NewOps.size()).getNode();
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// The node morphed into a different node. Normally for this to happen
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// the original node would have to be marked NewNode. However this can
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// in theory momentarily not be the case while ReplaceValueWith is doing
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// its stuff. Mark the original node NewNode to help sanity checking.
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N->setNodeId(NewNode);
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if (M->getNodeId() != NewNode && M->getNodeId() != Unanalyzed)
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// It morphed into a previously analyzed node - nothing more to do.
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// It morphed into a different new node. Do the equivalent of passing
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// it to AnalyzeNewNode: expunge it and calculate the NodeId. No need
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// to remap the operands, since they are the same as the operands we
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// Calculate the NodeId.
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N->setNodeId(N->getNumOperands() - NumProcessed);
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if (N->getNodeId() == ReadyToProcess)
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Worklist.push_back(N);
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/// AnalyzeNewValue - Call AnalyzeNewNode, updating the node in Val if needed.
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/// If the node changes to a processed node, then remap it.
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void DAGTypeLegalizer::AnalyzeNewValue(SDValue &Val) {
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Val.setNode(AnalyzeNewNode(Val.getNode()));
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if (Val.getNode()->getNodeId() == Processed)
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// We were passed a processed node, or it morphed into one - remap it.
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/// ExpungeNode - If N has a bogus mapping in ReplacedValues, eliminate it.
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/// This can occur when a node is deleted then reallocated as a new node -
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/// the mapping in ReplacedValues applies to the deleted node, not the new
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/// The only map that can have a deleted node as a source is ReplacedValues.
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/// Other maps can have deleted nodes as targets, but since their looked-up
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/// values are always immediately remapped using RemapValue, resulting in a
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/// not-deleted node, this is harmless as long as ReplacedValues/RemapValue
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/// always performs correct mappings. In order to keep the mapping correct,
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/// ExpungeNode should be called on any new nodes *before* adding them as
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/// either source or target to ReplacedValues (which typically means calling
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/// Expunge when a new node is first seen, since it may no longer be marked
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/// NewNode by the time it is added to ReplacedValues).
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void DAGTypeLegalizer::ExpungeNode(SDNode *N) {
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if (N->getNodeId() != NewNode)
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// If N is not remapped by ReplacedValues then there is nothing to do.
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for (i = 0, e = N->getNumValues(); i != e; ++i)
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if (ReplacedValues.find(SDValue(N, i)) != ReplacedValues.end())
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// Remove N from all maps - this is expensive but rare.
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for (DenseMap<SDValue, SDValue>::iterator I = PromotedIntegers.begin(),
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E = PromotedIntegers.end(); I != E; ++I) {
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assert(I->first.getNode() != N);
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RemapValue(I->second);
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for (DenseMap<SDValue, SDValue>::iterator I = SoftenedFloats.begin(),
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E = SoftenedFloats.end(); I != E; ++I) {
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assert(I->first.getNode() != N);
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RemapValue(I->second);
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for (DenseMap<SDValue, SDValue>::iterator I = ScalarizedVectors.begin(),
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E = ScalarizedVectors.end(); I != E; ++I) {
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assert(I->first.getNode() != N);
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RemapValue(I->second);
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for (DenseMap<SDValue, SDValue>::iterator I = WidenedVectors.begin(),
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E = WidenedVectors.end(); I != E; ++I) {
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assert(I->first.getNode() != N);
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RemapValue(I->second);
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for (DenseMap<SDValue, std::pair<SDValue, SDValue> >::iterator
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I = ExpandedIntegers.begin(), E = ExpandedIntegers.end(); I != E; ++I){
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assert(I->first.getNode() != N);
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RemapValue(I->second.first);
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RemapValue(I->second.second);
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for (DenseMap<SDValue, std::pair<SDValue, SDValue> >::iterator
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I = ExpandedFloats.begin(), E = ExpandedFloats.end(); I != E; ++I) {
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assert(I->first.getNode() != N);
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RemapValue(I->second.first);
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RemapValue(I->second.second);
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for (DenseMap<SDValue, std::pair<SDValue, SDValue> >::iterator
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I = SplitVectors.begin(), E = SplitVectors.end(); I != E; ++I) {
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assert(I->first.getNode() != N);
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RemapValue(I->second.first);
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RemapValue(I->second.second);
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for (DenseMap<SDValue, SDValue>::iterator I = ReplacedValues.begin(),
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E = ReplacedValues.end(); I != E; ++I)
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RemapValue(I->second);
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for (unsigned i = 0, e = N->getNumValues(); i != e; ++i)
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ReplacedValues.erase(SDValue(N, i));
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/// RemapValue - If the specified value was already legalized to another value,
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/// replace it by that value.
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void DAGTypeLegalizer::RemapValue(SDValue &N) {
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DenseMap<SDValue, SDValue>::iterator I = ReplacedValues.find(N);
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if (I != ReplacedValues.end()) {
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// Use path compression to speed up future lookups if values get multiply
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// replaced with other values.
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RemapValue(I->second);
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assert(N.getNode()->getNodeId() != NewNode && "Mapped to new node!");
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/// NodeUpdateListener - This class is a DAGUpdateListener that listens for
629
/// updates to nodes and recomputes their ready state.
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class NodeUpdateListener : public SelectionDAG::DAGUpdateListener {
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DAGTypeLegalizer &DTL;
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SmallSetVector<SDNode*, 16> &NodesToAnalyze;
634
explicit NodeUpdateListener(DAGTypeLegalizer &dtl,
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SmallSetVector<SDNode*, 16> &nta)
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: DTL(dtl), NodesToAnalyze(nta) {}
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virtual void NodeDeleted(SDNode *N, SDNode *E) {
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assert(N->getNodeId() != DAGTypeLegalizer::ReadyToProcess &&
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N->getNodeId() != DAGTypeLegalizer::Processed &&
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"Invalid node ID for RAUW deletion!");
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// It is possible, though rare, for the deleted node N to occur as a
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// target in a map, so note the replacement N -> E in ReplacedValues.
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assert(E && "Node not replaced?");
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DTL.NoteDeletion(N, E);
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// In theory the deleted node could also have been scheduled for analysis.
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// So remove it from the set of nodes which will be analyzed.
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NodesToAnalyze.remove(N);
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// In general nothing needs to be done for E, since it didn't change but
652
// only gained new uses. However N -> E was just added to ReplacedValues,
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// and the result of a ReplacedValues mapping is not allowed to be marked
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// NewNode. So if E is marked NewNode, then it needs to be analyzed.
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if (E->getNodeId() == DAGTypeLegalizer::NewNode)
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NodesToAnalyze.insert(E);
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virtual void NodeUpdated(SDNode *N) {
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// Node updates can mean pretty much anything. It is possible that an
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// operand was set to something already processed (f.e.) in which case
662
// this node could become ready. Recompute its flags.
663
assert(N->getNodeId() != DAGTypeLegalizer::ReadyToProcess &&
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N->getNodeId() != DAGTypeLegalizer::Processed &&
665
"Invalid node ID for RAUW deletion!");
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N->setNodeId(DAGTypeLegalizer::NewNode);
667
NodesToAnalyze.insert(N);
673
/// ReplaceValueWith - The specified value was legalized to the specified other
674
/// value. Update the DAG and NodeIds replacing any uses of From to use To
676
void DAGTypeLegalizer::ReplaceValueWith(SDValue From, SDValue To) {
677
assert(From.getNode() != To.getNode() && "Potential legalization loop!");
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// If expansion produced new nodes, make sure they are properly marked.
680
ExpungeNode(From.getNode());
681
AnalyzeNewValue(To); // Expunges To.
683
// Anything that used the old node should now use the new one. Note that this
684
// can potentially cause recursive merging.
685
SmallSetVector<SDNode*, 16> NodesToAnalyze;
686
NodeUpdateListener NUL(*this, NodesToAnalyze);
687
DAG.ReplaceAllUsesOfValueWith(From, To, &NUL);
689
// The old node may still be present in a map like ExpandedIntegers or
690
// PromotedIntegers. Inform maps about the replacement.
691
ReplacedValues[From] = To;
693
// Process the list of nodes that need to be reanalyzed.
694
while (!NodesToAnalyze.empty()) {
695
SDNode *N = NodesToAnalyze.back();
696
NodesToAnalyze.pop_back();
697
if (N->getNodeId() != DAGTypeLegalizer::NewNode)
698
// The node was analyzed while reanalyzing an earlier node - it is safe to
699
// skip. Note that this is not a morphing node - otherwise it would still
700
// be marked NewNode.
703
// Analyze the node's operands and recalculate the node ID.
704
SDNode *M = AnalyzeNewNode(N);
706
// The node morphed into a different node. Make everyone use the new node
708
assert(M->getNodeId() != NewNode && "Analysis resulted in NewNode!");
709
assert(N->getNumValues() == M->getNumValues() &&
710
"Node morphing changed the number of results!");
711
for (unsigned i = 0, e = N->getNumValues(); i != e; ++i) {
712
SDValue OldVal(N, i);
713
SDValue NewVal(M, i);
714
if (M->getNodeId() == Processed)
716
DAG.ReplaceAllUsesOfValueWith(OldVal, NewVal, &NUL);
718
// The original node continues to exist in the DAG, marked NewNode.
723
void DAGTypeLegalizer::SetPromotedInteger(SDValue Op, SDValue Result) {
724
assert(Result.getValueType() == TLI.getTypeToTransformTo(*DAG.getContext(), Op.getValueType()) &&
725
"Invalid type for promoted integer");
726
AnalyzeNewValue(Result);
728
SDValue &OpEntry = PromotedIntegers[Op];
729
assert(OpEntry.getNode() == 0 && "Node is already promoted!");
733
void DAGTypeLegalizer::SetSoftenedFloat(SDValue Op, SDValue Result) {
734
assert(Result.getValueType() == TLI.getTypeToTransformTo(*DAG.getContext(), Op.getValueType()) &&
735
"Invalid type for softened float");
736
AnalyzeNewValue(Result);
738
SDValue &OpEntry = SoftenedFloats[Op];
739
assert(OpEntry.getNode() == 0 && "Node is already converted to integer!");
743
void DAGTypeLegalizer::SetScalarizedVector(SDValue Op, SDValue Result) {
744
assert(Result.getValueType() == Op.getValueType().getVectorElementType() &&
745
"Invalid type for scalarized vector");
746
AnalyzeNewValue(Result);
748
SDValue &OpEntry = ScalarizedVectors[Op];
749
assert(OpEntry.getNode() == 0 && "Node is already scalarized!");
753
void DAGTypeLegalizer::GetExpandedInteger(SDValue Op, SDValue &Lo,
755
std::pair<SDValue, SDValue> &Entry = ExpandedIntegers[Op];
756
RemapValue(Entry.first);
757
RemapValue(Entry.second);
758
assert(Entry.first.getNode() && "Operand isn't expanded");
763
void DAGTypeLegalizer::SetExpandedInteger(SDValue Op, SDValue Lo,
765
assert(Lo.getValueType() == TLI.getTypeToTransformTo(*DAG.getContext(), Op.getValueType()) &&
766
Hi.getValueType() == Lo.getValueType() &&
767
"Invalid type for expanded integer");
768
// Lo/Hi may have been newly allocated, if so, add nodeid's as relevant.
772
// Remember that this is the result of the node.
773
std::pair<SDValue, SDValue> &Entry = ExpandedIntegers[Op];
774
assert(Entry.first.getNode() == 0 && "Node already expanded");
779
void DAGTypeLegalizer::GetExpandedFloat(SDValue Op, SDValue &Lo,
781
std::pair<SDValue, SDValue> &Entry = ExpandedFloats[Op];
782
RemapValue(Entry.first);
783
RemapValue(Entry.second);
784
assert(Entry.first.getNode() && "Operand isn't expanded");
789
void DAGTypeLegalizer::SetExpandedFloat(SDValue Op, SDValue Lo,
791
assert(Lo.getValueType() == TLI.getTypeToTransformTo(*DAG.getContext(), Op.getValueType()) &&
792
Hi.getValueType() == Lo.getValueType() &&
793
"Invalid type for expanded float");
794
// Lo/Hi may have been newly allocated, if so, add nodeid's as relevant.
798
// Remember that this is the result of the node.
799
std::pair<SDValue, SDValue> &Entry = ExpandedFloats[Op];
800
assert(Entry.first.getNode() == 0 && "Node already expanded");
805
void DAGTypeLegalizer::GetSplitVector(SDValue Op, SDValue &Lo,
807
std::pair<SDValue, SDValue> &Entry = SplitVectors[Op];
808
RemapValue(Entry.first);
809
RemapValue(Entry.second);
810
assert(Entry.first.getNode() && "Operand isn't split");
815
void DAGTypeLegalizer::SetSplitVector(SDValue Op, SDValue Lo,
817
assert(Lo.getValueType().getVectorElementType() ==
818
Op.getValueType().getVectorElementType() &&
819
2*Lo.getValueType().getVectorNumElements() ==
820
Op.getValueType().getVectorNumElements() &&
821
Hi.getValueType() == Lo.getValueType() &&
822
"Invalid type for split vector");
823
// Lo/Hi may have been newly allocated, if so, add nodeid's as relevant.
827
// Remember that this is the result of the node.
828
std::pair<SDValue, SDValue> &Entry = SplitVectors[Op];
829
assert(Entry.first.getNode() == 0 && "Node already split");
834
void DAGTypeLegalizer::SetWidenedVector(SDValue Op, SDValue Result) {
835
assert(Result.getValueType() == TLI.getTypeToTransformTo(*DAG.getContext(), Op.getValueType()) &&
836
"Invalid type for widened vector");
837
AnalyzeNewValue(Result);
839
SDValue &OpEntry = WidenedVectors[Op];
840
assert(OpEntry.getNode() == 0 && "Node already widened!");
845
//===----------------------------------------------------------------------===//
847
//===----------------------------------------------------------------------===//
849
/// BitConvertToInteger - Convert to an integer of the same size.
850
SDValue DAGTypeLegalizer::BitConvertToInteger(SDValue Op) {
851
unsigned BitWidth = Op.getValueType().getSizeInBits();
852
return DAG.getNode(ISD::BIT_CONVERT, Op.getDebugLoc(),
853
EVT::getIntegerVT(*DAG.getContext(), BitWidth), Op);
856
/// BitConvertVectorToIntegerVector - Convert to a vector of integers of the
858
SDValue DAGTypeLegalizer::BitConvertVectorToIntegerVector(SDValue Op) {
859
assert(Op.getValueType().isVector() && "Only applies to vectors!");
860
unsigned EltWidth = Op.getValueType().getVectorElementType().getSizeInBits();
861
EVT EltNVT = EVT::getIntegerVT(*DAG.getContext(), EltWidth);
862
unsigned NumElts = Op.getValueType().getVectorNumElements();
863
return DAG.getNode(ISD::BIT_CONVERT, Op.getDebugLoc(),
864
EVT::getVectorVT(*DAG.getContext(), EltNVT, NumElts), Op);
867
SDValue DAGTypeLegalizer::CreateStackStoreLoad(SDValue Op,
869
DebugLoc dl = Op.getDebugLoc();
870
// Create the stack frame object. Make sure it is aligned for both
871
// the source and destination types.
872
SDValue StackPtr = DAG.CreateStackTemporary(Op.getValueType(), DestVT);
873
// Emit a store to the stack slot.
874
SDValue Store = DAG.getStore(DAG.getEntryNode(), dl, Op, StackPtr, NULL, 0,
876
// Result is a load from the stack slot.
877
return DAG.getLoad(DestVT, dl, Store, StackPtr, NULL, 0, false, false, 0);
880
/// CustomLowerNode - Replace the node's results with custom code provided
881
/// by the target and return "true", or do nothing and return "false".
882
/// The last parameter is FALSE if we are dealing with a node with legal
883
/// result types and illegal operand. The second parameter denotes the type of
884
/// illegal OperandNo in that case.
885
/// The last parameter being TRUE means we are dealing with a
886
/// node with illegal result types. The second parameter denotes the type of
887
/// illegal ResNo in that case.
888
bool DAGTypeLegalizer::CustomLowerNode(SDNode *N, EVT VT, bool LegalizeResult) {
889
// See if the target wants to custom lower this node.
890
if (TLI.getOperationAction(N->getOpcode(), VT) != TargetLowering::Custom)
893
SmallVector<SDValue, 8> Results;
895
TLI.ReplaceNodeResults(N, Results, DAG);
897
TLI.LowerOperationWrapper(N, Results, DAG);
900
// The target didn't want to custom lower it after all.
903
// Make everything that once used N's values now use those in Results instead.
904
assert(Results.size() == N->getNumValues() &&
905
"Custom lowering returned the wrong number of results!");
906
for (unsigned i = 0, e = Results.size(); i != e; ++i)
907
ReplaceValueWith(SDValue(N, i), Results[i]);
912
/// CustomWidenLowerNode - Widen the node's results with custom code provided
913
/// by the target and return "true", or do nothing and return "false".
914
bool DAGTypeLegalizer::CustomWidenLowerNode(SDNode *N, EVT VT) {
915
// See if the target wants to custom lower this node.
916
if (TLI.getOperationAction(N->getOpcode(), VT) != TargetLowering::Custom)
919
SmallVector<SDValue, 8> Results;
920
TLI.ReplaceNodeResults(N, Results, DAG);
923
// The target didn't want to custom widen lower its result after all.
926
// Update the widening map.
927
assert(Results.size() == N->getNumValues() &&
928
"Custom lowering returned the wrong number of results!");
929
for (unsigned i = 0, e = Results.size(); i != e; ++i)
930
SetWidenedVector(SDValue(N, i), Results[i]);
934
/// GetSplitDestVTs - Compute the VTs needed for the low/hi parts of a type
935
/// which is split into two not necessarily identical pieces.
936
void DAGTypeLegalizer::GetSplitDestVTs(EVT InVT, EVT &LoVT, EVT &HiVT) {
937
// Currently all types are split in half.
938
if (!InVT.isVector()) {
939
LoVT = HiVT = TLI.getTypeToTransformTo(*DAG.getContext(), InVT);
941
unsigned NumElements = InVT.getVectorNumElements();
942
assert(!(NumElements & 1) && "Splitting vector, but not in half!");
943
LoVT = HiVT = EVT::getVectorVT(*DAG.getContext(), InVT.getVectorElementType(), NumElements/2);
947
/// GetPairElements - Use ISD::EXTRACT_ELEMENT nodes to extract the low and
948
/// high parts of the given value.
949
void DAGTypeLegalizer::GetPairElements(SDValue Pair,
950
SDValue &Lo, SDValue &Hi) {
951
DebugLoc dl = Pair.getDebugLoc();
952
EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), Pair.getValueType());
953
Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, NVT, Pair,
954
DAG.getIntPtrConstant(0));
955
Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, NVT, Pair,
956
DAG.getIntPtrConstant(1));
959
SDValue DAGTypeLegalizer::GetVectorElementPointer(SDValue VecPtr, EVT EltVT,
961
DebugLoc dl = Index.getDebugLoc();
962
// Make sure the index type is big enough to compute in.
963
if (Index.getValueType().bitsGT(TLI.getPointerTy()))
964
Index = DAG.getNode(ISD::TRUNCATE, dl, TLI.getPointerTy(), Index);
966
Index = DAG.getNode(ISD::ZERO_EXTEND, dl, TLI.getPointerTy(), Index);
968
// Calculate the element offset and add it to the pointer.
969
unsigned EltSize = EltVT.getSizeInBits() / 8; // FIXME: should be ABI size.
971
Index = DAG.getNode(ISD::MUL, dl, Index.getValueType(), Index,
972
DAG.getConstant(EltSize, Index.getValueType()));
973
return DAG.getNode(ISD::ADD, dl, Index.getValueType(), Index, VecPtr);
976
/// JoinIntegers - Build an integer with low bits Lo and high bits Hi.
977
SDValue DAGTypeLegalizer::JoinIntegers(SDValue Lo, SDValue Hi) {
978
// Arbitrarily use dlHi for result DebugLoc
979
DebugLoc dlHi = Hi.getDebugLoc();
980
DebugLoc dlLo = Lo.getDebugLoc();
981
EVT LVT = Lo.getValueType();
982
EVT HVT = Hi.getValueType();
983
EVT NVT = EVT::getIntegerVT(*DAG.getContext(), LVT.getSizeInBits() + HVT.getSizeInBits());
985
Lo = DAG.getNode(ISD::ZERO_EXTEND, dlLo, NVT, Lo);
986
Hi = DAG.getNode(ISD::ANY_EXTEND, dlHi, NVT, Hi);
987
Hi = DAG.getNode(ISD::SHL, dlHi, NVT, Hi,
988
DAG.getConstant(LVT.getSizeInBits(), TLI.getPointerTy()));
989
return DAG.getNode(ISD::OR, dlHi, NVT, Lo, Hi);
992
/// LibCallify - Convert the node into a libcall with the same prototype.
993
SDValue DAGTypeLegalizer::LibCallify(RTLIB::Libcall LC, SDNode *N,
995
unsigned NumOps = N->getNumOperands();
996
DebugLoc dl = N->getDebugLoc();
998
return MakeLibCall(LC, N->getValueType(0), 0, 0, isSigned, dl);
999
} else if (NumOps == 1) {
1000
SDValue Op = N->getOperand(0);
1001
return MakeLibCall(LC, N->getValueType(0), &Op, 1, isSigned, dl);
1002
} else if (NumOps == 2) {
1003
SDValue Ops[2] = { N->getOperand(0), N->getOperand(1) };
1004
return MakeLibCall(LC, N->getValueType(0), Ops, 2, isSigned, dl);
1006
SmallVector<SDValue, 8> Ops(NumOps);
1007
for (unsigned i = 0; i < NumOps; ++i)
1008
Ops[i] = N->getOperand(i);
1010
return MakeLibCall(LC, N->getValueType(0), &Ops[0], NumOps, isSigned, dl);
1013
/// MakeLibCall - Generate a libcall taking the given operands as arguments and
1014
/// returning a result of type RetVT.
1015
SDValue DAGTypeLegalizer::MakeLibCall(RTLIB::Libcall LC, EVT RetVT,
1016
const SDValue *Ops, unsigned NumOps,
1017
bool isSigned, DebugLoc dl) {
1018
TargetLowering::ArgListTy Args;
1019
Args.reserve(NumOps);
1021
TargetLowering::ArgListEntry Entry;
1022
for (unsigned i = 0; i != NumOps; ++i) {
1023
Entry.Node = Ops[i];
1024
Entry.Ty = Entry.Node.getValueType().getTypeForEVT(*DAG.getContext());
1025
Entry.isSExt = isSigned;
1026
Entry.isZExt = !isSigned;
1027
Args.push_back(Entry);
1029
SDValue Callee = DAG.getExternalSymbol(TLI.getLibcallName(LC),
1030
TLI.getPointerTy());
1032
const Type *RetTy = RetVT.getTypeForEVT(*DAG.getContext());
1033
std::pair<SDValue,SDValue> CallInfo =
1034
TLI.LowerCallTo(DAG.getEntryNode(), RetTy, isSigned, !isSigned, false,
1035
false, 0, TLI.getLibcallCallingConv(LC), false,
1036
/*isReturnValueUsed=*/true,
1037
Callee, Args, DAG, dl);
1038
return CallInfo.first;
1041
/// PromoteTargetBoolean - Promote the given target boolean to a target boolean
1042
/// of the given type. A target boolean is an integer value, not necessarily of
1043
/// type i1, the bits of which conform to getBooleanContents.
1044
SDValue DAGTypeLegalizer::PromoteTargetBoolean(SDValue Bool, EVT VT) {
1045
DebugLoc dl = Bool.getDebugLoc();
1046
ISD::NodeType ExtendCode;
1047
switch (TLI.getBooleanContents()) {
1049
assert(false && "Unknown BooleanContent!");
1050
case TargetLowering::UndefinedBooleanContent:
1051
// Extend to VT by adding rubbish bits.
1052
ExtendCode = ISD::ANY_EXTEND;
1054
case TargetLowering::ZeroOrOneBooleanContent:
1055
// Extend to VT by adding zero bits.
1056
ExtendCode = ISD::ZERO_EXTEND;
1058
case TargetLowering::ZeroOrNegativeOneBooleanContent: {
1059
// Extend to VT by copying the sign bit.
1060
ExtendCode = ISD::SIGN_EXTEND;
1064
return DAG.getNode(ExtendCode, dl, VT, Bool);
1067
/// SplitInteger - Return the lower LoVT bits of Op in Lo and the upper HiVT
1069
void DAGTypeLegalizer::SplitInteger(SDValue Op,
1071
SDValue &Lo, SDValue &Hi) {
1072
DebugLoc dl = Op.getDebugLoc();
1073
assert(LoVT.getSizeInBits() + HiVT.getSizeInBits() ==
1074
Op.getValueType().getSizeInBits() && "Invalid integer splitting!");
1075
Lo = DAG.getNode(ISD::TRUNCATE, dl, LoVT, Op);
1076
Hi = DAG.getNode(ISD::SRL, dl, Op.getValueType(), Op,
1077
DAG.getConstant(LoVT.getSizeInBits(), TLI.getPointerTy()));
1078
Hi = DAG.getNode(ISD::TRUNCATE, dl, HiVT, Hi);
1081
/// SplitInteger - Return the lower and upper halves of Op's bits in a value
1082
/// type half the size of Op's.
1083
void DAGTypeLegalizer::SplitInteger(SDValue Op,
1084
SDValue &Lo, SDValue &Hi) {
1085
EVT HalfVT = EVT::getIntegerVT(*DAG.getContext(), Op.getValueType().getSizeInBits()/2);
1086
SplitInteger(Op, HalfVT, HalfVT, Lo, Hi);
1090
//===----------------------------------------------------------------------===//
1092
//===----------------------------------------------------------------------===//
1094
/// LegalizeTypes - This transforms the SelectionDAG into a SelectionDAG that
1095
/// only uses types natively supported by the target. Returns "true" if it made
1098
/// Note that this is an involved process that may invalidate pointers into
1100
bool SelectionDAG::LegalizeTypes() {
1101
return DAGTypeLegalizer(*this).run();
added
removed
libclamav/c++/llvm/lib/CodeGen/SelectionDAG/LegalizeTypes.cpp
