mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-09-12 21:56:41 +00:00
ddc016cc85
much simpler than in LegalizeDAG because calls are not yet expanded into call sequences: that happens after type legalization has finished. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49634 91177308-0d34-0410-b5e6-96231b3b80d8
565 lines
20 KiB
C++
565 lines
20 KiB
C++
//===-- LegalizeTypes.cpp - Common code for DAG type legalizer ------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// 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. This
|
|
// is common code shared among the LegalizeTypes*.cpp files.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "LegalizeTypes.h"
|
|
#include "llvm/CallingConv.h"
|
|
#include "llvm/Constants.h"
|
|
#include "llvm/DerivedTypes.h"
|
|
#include "llvm/Support/CommandLine.h"
|
|
#include "llvm/Support/MathExtras.h"
|
|
using namespace llvm;
|
|
|
|
#ifndef NDEBUG
|
|
static cl::opt<bool>
|
|
ViewLegalizeTypesDAGs("view-legalize-types-dags", cl::Hidden,
|
|
cl::desc("Pop up a window to show dags before legalize types"));
|
|
#else
|
|
static const bool ViewLegalizeTypesDAGs = 0;
|
|
#endif
|
|
|
|
|
|
|
|
/// 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() {
|
|
// 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());
|
|
|
|
// 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
|
|
// non-leaves.
|
|
for (SelectionDAG::allnodes_iterator I = DAG.allnodes_begin(),
|
|
E = DAG.allnodes_end(); I != E; ++I) {
|
|
if (I->getNumOperands() == 0) {
|
|
I->setNodeId(ReadyToProcess);
|
|
Worklist.push_back(I);
|
|
} else {
|
|
I->setNodeId(NewNode);
|
|
}
|
|
}
|
|
|
|
// Now that we have a set of nodes to process, handle them all.
|
|
while (!Worklist.empty()) {
|
|
SDNode *N = Worklist.back();
|
|
Worklist.pop_back();
|
|
assert(N->getNodeId() == ReadyToProcess &&
|
|
"Node should be ready if on worklist!");
|
|
|
|
// 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);
|
|
switch (getTypeAction(ResultVT)) {
|
|
default:
|
|
assert(false && "Unknown action!");
|
|
case Legal:
|
|
break;
|
|
case Promote:
|
|
PromoteResult(N, i);
|
|
goto NodeDone;
|
|
case Expand:
|
|
ExpandResult(N, i);
|
|
goto NodeDone;
|
|
case FloatToInt:
|
|
FloatToIntResult(N, i);
|
|
goto NodeDone;
|
|
case Scalarize:
|
|
ScalarizeResult(N, i);
|
|
goto NodeDone;
|
|
case Split:
|
|
SplitResult(N, i);
|
|
goto NodeDone;
|
|
}
|
|
} while (++i < NumResults);
|
|
|
|
// Scan the operand list for the node, handling any nodes with operands that
|
|
// are illegal.
|
|
{
|
|
unsigned NumOperands = N->getNumOperands();
|
|
bool NeedsRevisit = false;
|
|
for (i = 0; i != NumOperands; ++i) {
|
|
MVT::ValueType OpVT = N->getOperand(i).getValueType();
|
|
switch (getTypeAction(OpVT)) {
|
|
default:
|
|
assert(false && "Unknown action!");
|
|
case Legal:
|
|
continue;
|
|
case Promote:
|
|
NeedsRevisit = PromoteOperand(N, i);
|
|
break;
|
|
case Expand:
|
|
NeedsRevisit = ExpandOperand(N, i);
|
|
break;
|
|
case FloatToInt:
|
|
NeedsRevisit = FloatToIntOperand(N, i);
|
|
break;
|
|
case Scalarize:
|
|
NeedsRevisit = ScalarizeOperand(N, i);
|
|
break;
|
|
case Split:
|
|
NeedsRevisit = SplitOperand(N, i);
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
|
|
// If the node needs revisiting, don't add all users to the worklist etc.
|
|
if (NeedsRevisit)
|
|
continue;
|
|
|
|
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.
|
|
N->setNodeId(Processed);
|
|
|
|
for (SDNode::use_iterator UI = N->use_begin(), E = N->use_end();
|
|
UI != E; ++UI) {
|
|
SDNode *User = UI->getUser();
|
|
int NodeID = User->getNodeId();
|
|
assert(NodeID != ReadyToProcess && NodeID != Processed &&
|
|
"Invalid node id for user of unprocessed node!");
|
|
|
|
// 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 this was the last use it was waiting on, add it to the ready list.
|
|
if (NodeID-1 == ReadyToProcess)
|
|
Worklist.push_back(User);
|
|
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
|
|
// (as this node is now processed).
|
|
assert(NodeID == NewNode && "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();
|
|
|
|
// 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.
|
|
DAG.RemoveDeadNodes();
|
|
|
|
// In a debug build, scan all the nodes to make sure we found them all. This
|
|
// ensures that there are no cycles and that everything got processed.
|
|
#ifndef NDEBUG
|
|
for (SelectionDAG::allnodes_iterator I = DAG.allnodes_begin(),
|
|
E = DAG.allnodes_end(); I != E; ++I) {
|
|
bool Failed = false;
|
|
|
|
// Check that all result types are legal.
|
|
for (unsigned i = 0, NumVals = I->getNumValues(); i < NumVals; ++i)
|
|
if (!isTypeLegal(I->getValueType(i))) {
|
|
cerr << "Result type " << i << " illegal!\n";
|
|
Failed = true;
|
|
}
|
|
|
|
// Check that all operand types are legal.
|
|
for (unsigned i = 0, NumOps = I->getNumOperands(); i < NumOps; ++i)
|
|
if (!isTypeLegal(I->getOperand(i).getValueType())) {
|
|
cerr << "Operand type " << i << " illegal!\n";
|
|
Failed = true;
|
|
}
|
|
|
|
if (I->getNodeId() != Processed) {
|
|
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";
|
|
Failed = true;
|
|
}
|
|
|
|
if (Failed) {
|
|
I->dump(&DAG); cerr << "\n";
|
|
abort();
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/// 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.
|
|
void DAGTypeLegalizer::AnalyzeNewNode(SDNode *&N) {
|
|
// If this was an existing node that is already done, we're done.
|
|
if (N->getNodeId() != NewNode)
|
|
return;
|
|
|
|
// 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
|
|
// of the new tree that was constructed (usually 2-3 nodes), so we don't worry
|
|
// about revisiting of nodes.
|
|
//
|
|
// 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.
|
|
// Already processed operands may need to be remapped to the node that
|
|
// replaced them, which can result in our node changing. Since remapping
|
|
// is rare, the code tries to minimize overhead in the non-remapping case.
|
|
|
|
SmallVector<SDOperand, 8> NewOps;
|
|
unsigned NumProcessed = 0;
|
|
for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
|
|
SDOperand OrigOp = N->getOperand(i);
|
|
SDOperand Op = OrigOp;
|
|
|
|
if (Op.Val->getNodeId() == Processed)
|
|
RemapNode(Op);
|
|
|
|
if (Op.Val->getNodeId() == NewNode)
|
|
AnalyzeNewNode(Op.Val);
|
|
else if (Op.Val->getNodeId() == Processed)
|
|
++NumProcessed;
|
|
|
|
if (!NewOps.empty()) {
|
|
// Some previous operand changed. Add this one to the list.
|
|
NewOps.push_back(Op);
|
|
} else if (Op != OrigOp) {
|
|
// This is the first operand to change - add all operands so far.
|
|
for (unsigned j = 0; j < i; ++j)
|
|
NewOps.push_back(N->getOperand(j));
|
|
NewOps.push_back(Op);
|
|
}
|
|
}
|
|
|
|
// Some operands changed - update the node.
|
|
if (!NewOps.empty())
|
|
N = DAG.UpdateNodeOperands(SDOperand(N, 0), &NewOps[0], NewOps.size()).Val;
|
|
|
|
N->setNodeId(N->getNumOperands()-NumProcessed);
|
|
if (N->getNodeId() == ReadyToProcess)
|
|
Worklist.push_back(N);
|
|
}
|
|
|
|
void DAGTypeLegalizer::SanityCheck(SDNode *N) {
|
|
for (SmallVector<SDNode*, 128>::iterator I = Worklist.begin(),
|
|
E = Worklist.end(); I != E; ++I)
|
|
assert(*I != N);
|
|
|
|
for (DenseMap<SDOperandImpl, SDOperand>::iterator I = ReplacedNodes.begin(),
|
|
E = ReplacedNodes.end(); I != E; ++I) {
|
|
assert(I->first.Val != N);
|
|
assert(I->second.Val != N);
|
|
}
|
|
|
|
for (DenseMap<SDOperandImpl, SDOperand>::iterator I = PromotedNodes.begin(),
|
|
E = PromotedNodes.end(); I != E; ++I) {
|
|
assert(I->first.Val != N);
|
|
assert(I->second.Val != N);
|
|
}
|
|
|
|
for (DenseMap<SDOperandImpl, SDOperand>::iterator
|
|
I = FloatToIntedNodes.begin(),
|
|
E = FloatToIntedNodes.end(); I != E; ++I) {
|
|
assert(I->first.Val != N);
|
|
assert(I->second.Val != N);
|
|
}
|
|
|
|
for (DenseMap<SDOperandImpl, SDOperand>::iterator I = ScalarizedNodes.begin(),
|
|
E = ScalarizedNodes.end(); I != E; ++I) {
|
|
assert(I->first.Val != N);
|
|
assert(I->second.Val != N);
|
|
}
|
|
|
|
for (DenseMap<SDOperandImpl, std::pair<SDOperand, SDOperand> >::iterator
|
|
I = ExpandedNodes.begin(), E = ExpandedNodes.end(); I != E; ++I) {
|
|
assert(I->first.Val != N);
|
|
assert(I->second.first.Val != N);
|
|
assert(I->second.second.Val != N);
|
|
}
|
|
|
|
for (DenseMap<SDOperandImpl, std::pair<SDOperand, SDOperand> >::iterator
|
|
I = SplitNodes.begin(), E = SplitNodes.end(); I != E; ++I) {
|
|
assert(I->first.Val != N);
|
|
assert(I->second.first.Val != N);
|
|
assert(I->second.second.Val != N);
|
|
}
|
|
}
|
|
|
|
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;
|
|
public:
|
|
NodeUpdateListener(DAGTypeLegalizer &dtl) : DTL(dtl) {}
|
|
|
|
virtual void NodeDeleted(SDNode *N) {
|
|
// Ignore deletes.
|
|
assert(N->getNodeId() != DAGTypeLegalizer::Processed &&
|
|
N->getNodeId() != DAGTypeLegalizer::ReadyToProcess &&
|
|
"RAUW deleted processed node!");
|
|
#ifndef NDEBUG
|
|
DTL.SanityCheck(N);
|
|
#endif
|
|
}
|
|
|
|
virtual void NodeUpdated(SDNode *N) {
|
|
// Node updates can mean pretty much anything. It is possible that an
|
|
// operand was set to something already processed (f.e.) in which case
|
|
// this node could become ready. Recompute its flags.
|
|
assert(N->getNodeId() != DAGTypeLegalizer::Processed &&
|
|
N->getNodeId() != DAGTypeLegalizer::ReadyToProcess &&
|
|
"RAUW updated processed node!");
|
|
DTL.ReanalyzeNode(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.
|
|
AnalyzeNewNode(To.Val);
|
|
|
|
// Anything that used the old node should now use the new one. Note that this
|
|
// can potentially cause recursive merging.
|
|
NodeUpdateListener NUL(*this);
|
|
DAG.ReplaceAllUsesOfValueWith(From, To, &NUL);
|
|
|
|
// The old node may still be present in ExpandedNodes or PromotedNodes.
|
|
// Inform them about the replacement.
|
|
ReplacedNodes[From] = To;
|
|
}
|
|
|
|
/// ReplaceNodeWith - Replace uses of the 'from' node's results with the 'to'
|
|
/// node's results. The from and to node must define identical result types.
|
|
void DAGTypeLegalizer::ReplaceNodeWith(SDNode *From, SDNode *To) {
|
|
if (From == To) return;
|
|
|
|
// If expansion produced new nodes, make sure they are properly marked.
|
|
AnalyzeNewNode(To);
|
|
|
|
assert(From->getNumValues() == To->getNumValues() &&
|
|
"Node results don't match");
|
|
|
|
// Anything that used the old node should now use the new one. Note that this
|
|
// can potentially cause recursive merging.
|
|
NodeUpdateListener NUL(*this);
|
|
DAG.ReplaceAllUsesWith(From, To, &NUL);
|
|
|
|
// The old node may still be present in ExpandedNodes or PromotedNodes.
|
|
// Inform them about the replacement.
|
|
for (unsigned i = 0, e = From->getNumValues(); i != e; ++i) {
|
|
assert(From->getValueType(i) == To->getValueType(i) &&
|
|
"Node results don't match");
|
|
ReplacedNodes[SDOperand(From, i)] = SDOperand(To, i);
|
|
}
|
|
}
|
|
|
|
|
|
/// RemapNode - If the specified value was already legalized to another value,
|
|
/// replace it by that value.
|
|
void DAGTypeLegalizer::RemapNode(SDOperand &N) {
|
|
DenseMap<SDOperandImpl, 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) {
|
|
AnalyzeNewNode(Result.Val);
|
|
|
|
SDOperand &OpEntry = PromotedNodes[Op];
|
|
assert(OpEntry.Val == 0 && "Node is already promoted!");
|
|
OpEntry = Result;
|
|
}
|
|
|
|
void DAGTypeLegalizer::SetIntegerOp(SDOperand Op, SDOperand Result) {
|
|
AnalyzeNewNode(Result.Val);
|
|
|
|
SDOperand &OpEntry = FloatToIntedNodes[Op];
|
|
assert(OpEntry.Val == 0 && "Node is already converted to integer!");
|
|
OpEntry = Result;
|
|
}
|
|
|
|
void DAGTypeLegalizer::SetScalarizedOp(SDOperand Op, SDOperand Result) {
|
|
AnalyzeNewNode(Result.Val);
|
|
|
|
SDOperand &OpEntry = ScalarizedNodes[Op];
|
|
assert(OpEntry.Val == 0 && "Node is already scalarized!");
|
|
OpEntry = Result;
|
|
}
|
|
|
|
void DAGTypeLegalizer::GetExpandedOp(SDOperand Op, SDOperand &Lo,
|
|
SDOperand &Hi) {
|
|
std::pair<SDOperand, SDOperand> &Entry = ExpandedNodes[Op];
|
|
RemapNode(Entry.first);
|
|
RemapNode(Entry.second);
|
|
assert(Entry.first.Val && "Operand isn't expanded");
|
|
Lo = Entry.first;
|
|
Hi = Entry.second;
|
|
}
|
|
|
|
void DAGTypeLegalizer::SetExpandedOp(SDOperand Op, SDOperand Lo, SDOperand Hi) {
|
|
// Lo/Hi may have been newly allocated, if so, add nodeid's as relevant.
|
|
AnalyzeNewNode(Lo.Val);
|
|
AnalyzeNewNode(Hi.Val);
|
|
|
|
// 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;
|
|
}
|
|
|
|
void DAGTypeLegalizer::GetSplitOp(SDOperand Op, SDOperand &Lo, SDOperand &Hi) {
|
|
std::pair<SDOperand, SDOperand> &Entry = SplitNodes[Op];
|
|
RemapNode(Entry.first);
|
|
RemapNode(Entry.second);
|
|
assert(Entry.first.Val && "Operand isn't split");
|
|
Lo = Entry.first;
|
|
Hi = Entry.second;
|
|
}
|
|
|
|
void DAGTypeLegalizer::SetSplitOp(SDOperand Op, SDOperand Lo, SDOperand Hi) {
|
|
// Lo/Hi may have been newly allocated, if so, add nodeid's as relevant.
|
|
AnalyzeNewNode(Lo.Val);
|
|
AnalyzeNewNode(Hi.Val);
|
|
|
|
// Remember that this is the result of the node.
|
|
std::pair<SDOperand, SDOperand> &Entry = SplitNodes[Op];
|
|
assert(Entry.first.Val == 0 && "Node already split");
|
|
Entry.first = Lo;
|
|
Entry.second = Hi;
|
|
}
|
|
|
|
|
|
/// BitConvertToInteger - Convert to an integer of the same size.
|
|
SDOperand DAGTypeLegalizer::BitConvertToInteger(SDOperand Op) {
|
|
return DAG.getNode(ISD::BIT_CONVERT,
|
|
MVT::getIntegerType(MVT::getSizeInBits(Op.getValueType())),
|
|
Op);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
/// JoinIntegers - Build an integer with low bits Lo and high bits Hi.
|
|
SDOperand DAGTypeLegalizer::JoinIntegers(SDOperand Lo, SDOperand Hi) {
|
|
MVT::ValueType LVT = Lo.getValueType();
|
|
MVT::ValueType HVT = Hi.getValueType();
|
|
MVT::ValueType NVT = MVT::getIntegerType(MVT::getSizeInBits(LVT) +
|
|
MVT::getSizeInBits(HVT));
|
|
|
|
Lo = DAG.getNode(ISD::ZERO_EXTEND, NVT, Lo);
|
|
Hi = DAG.getNode(ISD::ANY_EXTEND, NVT, Hi);
|
|
Hi = DAG.getNode(ISD::SHL, NVT, Hi, DAG.getConstant(MVT::getSizeInBits(LVT),
|
|
TLI.getShiftAmountTy()));
|
|
return DAG.getNode(ISD::OR, NVT, Lo, Hi);
|
|
}
|
|
|
|
/// SplitInteger - Return the lower LoVT bits of Op in Lo and the upper HiVT
|
|
/// bits in Hi.
|
|
void DAGTypeLegalizer::SplitInteger(SDOperand Op,
|
|
MVT::ValueType LoVT, MVT::ValueType HiVT,
|
|
SDOperand &Lo, SDOperand &Hi) {
|
|
assert(MVT::getSizeInBits(LoVT) + MVT::getSizeInBits(HiVT) ==
|
|
MVT::getSizeInBits(Op.getValueType()) && "Invalid integer splitting!");
|
|
Lo = DAG.getNode(ISD::TRUNCATE, LoVT, Op);
|
|
Hi = DAG.getNode(ISD::SRL, Op.getValueType(), Op,
|
|
DAG.getConstant(MVT::getSizeInBits(LoVT),
|
|
TLI.getShiftAmountTy()));
|
|
Hi = DAG.getNode(ISD::TRUNCATE, HiVT, Hi);
|
|
}
|
|
|
|
/// SplitInteger - Return the lower and upper halves of Op's bits in a value type
|
|
/// half the size of Op's.
|
|
void DAGTypeLegalizer::SplitInteger(SDOperand Op,
|
|
SDOperand &Lo, SDOperand &Hi) {
|
|
MVT::ValueType HalfVT =
|
|
MVT::getIntegerType(MVT::getSizeInBits(Op.getValueType())/2);
|
|
SplitInteger(Op, HalfVT, HalfVT, Lo, Hi);
|
|
}
|
|
|
|
/// MakeLibCall - Expand a node into a libcall and return the result.
|
|
SDOperand DAGTypeLegalizer::MakeLibCall(RTLIB::Libcall LC, SDNode *N,
|
|
bool isSigned) {
|
|
TargetLowering::ArgListTy Args;
|
|
TargetLowering::ArgListEntry Entry;
|
|
for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
|
|
MVT::ValueType ArgVT = N->getOperand(i).getValueType();
|
|
Entry.Node = N->getOperand(i);
|
|
Entry.Ty = MVT::getTypeForValueType(ArgVT);
|
|
Entry.isSExt = isSigned;
|
|
Entry.isZExt = !isSigned;
|
|
Args.push_back(Entry);
|
|
}
|
|
SDOperand Callee = DAG.getExternalSymbol(TLI.getLibcallName(LC),
|
|
TLI.getPointerTy());
|
|
|
|
const Type *RetTy = MVT::getTypeForValueType(N->getValueType(0));
|
|
std::pair<SDOperand,SDOperand> CallInfo =
|
|
TLI.LowerCallTo(DAG.getEntryNode(), RetTy, isSigned, !isSigned, false,
|
|
CallingConv::C, false, Callee, Args, DAG);
|
|
return CallInfo.first;
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Entry Point
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
/// LegalizeTypes - This transforms the SelectionDAG into a SelectionDAG that
|
|
/// only uses types natively supported by the target.
|
|
///
|
|
/// Note that this is an involved process that may invalidate pointers into
|
|
/// the graph.
|
|
void SelectionDAG::LegalizeTypes() {
|
|
if (ViewLegalizeTypesDAGs) viewGraph();
|
|
|
|
DAGTypeLegalizer(*this).run();
|
|
}
|