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https://github.com/c64scene-ar/llvm-6502.git
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06f0aff69e
completely forgotten about when writing LegalizeTypes. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58508 91177308-0d34-0410-b5e6-96231b3b80d8
737 lines
26 KiB
C++
737 lines
26 KiB
C++
//===-- LegalizeTypes.cpp - Common code for DAG type legalizer ------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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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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//===----------------------------------------------------------------------===//
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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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//===----------------------------------------------------------------------===//
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#include "LegalizeTypes.h"
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#include "llvm/CallingConv.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Target/TargetData.h"
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using namespace llvm;
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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.
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void DAGTypeLegalizer::run() {
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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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// 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 'NewNode' if
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// non-leaves.
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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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} else {
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I->setNodeId(NewNode);
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}
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}
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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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SDNode *N = Worklist.back();
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Worklist.pop_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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goto ScanOperands;
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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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MVT ResultVT = N->getValueType(i);
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switch (getTypeAction(ResultVT)) {
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default:
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assert(false && "Unknown action!");
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case Legal:
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break;
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case PromoteInteger:
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PromoteIntegerResult(N, i);
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goto NodeDone;
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case ExpandInteger:
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ExpandIntegerResult(N, i);
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goto NodeDone;
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case SoftenFloat:
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SoftenFloatResult(N, i);
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goto NodeDone;
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case ExpandFloat:
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ExpandFloatResult(N, i);
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goto NodeDone;
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case ScalarizeVector:
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ScalarizeVectorResult(N, i);
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goto NodeDone;
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case SplitVector:
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SplitVectorResult(N, i);
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goto NodeDone;
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}
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}
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ScanOperands:
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// Scan the operand list for the node, handling any nodes with operands that
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// are illegal.
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{
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unsigned NumOperands = N->getNumOperands();
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bool NeedsRevisit = false;
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unsigned i;
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for (i = 0; i != NumOperands; ++i) {
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if (IgnoreNodeResults(N->getOperand(i).getNode()))
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continue;
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MVT OpVT = N->getOperand(i).getValueType();
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switch (getTypeAction(OpVT)) {
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default:
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assert(false && "Unknown action!");
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case Legal:
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continue;
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case PromoteInteger:
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NeedsRevisit = PromoteIntegerOperand(N, i);
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break;
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case ExpandInteger:
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NeedsRevisit = ExpandIntegerOperand(N, i);
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break;
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case SoftenFloat:
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NeedsRevisit = SoftenFloatOperand(N, i);
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break;
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case ExpandFloat:
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NeedsRevisit = ExpandFloatOperand(N, i);
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break;
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case ScalarizeVector:
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NeedsRevisit = ScalarizeVectorOperand(N, i);
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break;
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case SplitVector:
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NeedsRevisit = SplitVectorOperand(N, i);
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break;
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}
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break;
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}
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// If the node needs revisiting, don't add all users to the worklist etc.
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if (NeedsRevisit)
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continue;
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if (i == NumOperands) {
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DEBUG(cerr << "Legally typed node: "; N->dump(&DAG); cerr << "\n");
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}
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}
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NodeDone:
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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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N->setNodeId(Processed);
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for (SDNode::use_iterator UI = N->use_begin(), E = N->use_end();
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UI != E; ++UI) {
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SDNode *User = *UI;
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int NodeId = User->getNodeId();
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assert(NodeId != ReadyToProcess && NodeId != Processed &&
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"Invalid node id for user of unprocessed node!");
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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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if (NodeId > 0) {
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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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continue;
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}
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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 == NewNode && "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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}
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}
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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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//DAG.viewGraph();
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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 can
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// cause unreachable nodes to be around with their flags set to new.
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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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#ifndef NDEBUG
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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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bool Failed = false;
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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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cerr << "Result type " << i << " illegal!\n";
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Failed = true;
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}
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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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cerr << "Operand type " << i << " illegal!\n";
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Failed = true;
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}
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if (I->getNodeId() != Processed) {
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if (I->getNodeId() == NewNode)
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cerr << "New node not 'noticed'?\n";
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else if (I->getNodeId() > 0)
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cerr << "Operand not processed?\n";
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else if (I->getNodeId() == ReadyToProcess)
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cerr << "Not added to worklist?\n";
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Failed = true;
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}
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if (Failed) {
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I->dump(&DAG); cerr << "\n";
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abort();
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}
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}
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#endif
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}
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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)
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return N;
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// Remove any stale map entries.
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ExpungeNode(N);
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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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//
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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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// Already processed operands may need to be remapped to the node that
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// replaced them, which can result in our node changing. Since remapping
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// is rare, the code tries to minimize overhead in the non-remapping 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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SDValue Op = OrigOp;
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if (Op.getNode()->getNodeId() == Processed)
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RemapValue(Op);
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else if (Op.getNode()->getNodeId() == NewNode)
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AnalyzeNewValue(Op);
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if (Op.getNode()->getNodeId() == Processed)
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++NumProcessed;
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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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for (unsigned j = 0; j < i; ++j)
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NewOps.push_back(N->getOperand(j));
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NewOps.push_back(Op);
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}
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}
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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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if (M != N) {
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if (M->getNodeId() != NewNode)
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// It morphed into a previously analyzed node - nothing more to do.
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return M;
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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.
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N = M;
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ExpungeNode(N);
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}
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}
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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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return N;
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}
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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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SDNode *N(Val.getNode());
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// If this was an existing node that is already done, avoid remapping it.
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if (N->getNodeId() != NewNode)
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return;
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SDNode *M(AnalyzeNewNode(N));
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if (M != N)
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Val.setNode(M);
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if (M->getNodeId() == Processed)
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// It morphed into an already processed node - remap it.
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RemapValue(Val);
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}
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namespace {
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/// NodeUpdateListener - This class is a DAGUpdateListener that listens for
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/// updates to nodes and recomputes their ready state.
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class VISIBILITY_HIDDEN NodeUpdateListener :
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public SelectionDAG::DAGUpdateListener {
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DAGTypeLegalizer &DTL;
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public:
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explicit NodeUpdateListener(DAGTypeLegalizer &dtl) : DTL(dtl) {}
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virtual void NodeDeleted(SDNode *N, SDNode *E) {
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assert(N->getNodeId() != DAGTypeLegalizer::Processed &&
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N->getNodeId() != DAGTypeLegalizer::ReadyToProcess &&
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"RAUW deleted processed node!");
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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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}
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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
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// this node could become ready. Recompute its flags.
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assert(N->getNodeId() != DAGTypeLegalizer::Processed &&
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N->getNodeId() != DAGTypeLegalizer::ReadyToProcess &&
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"RAUW updated processed node!");
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DTL.ReanalyzeNode(N);
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}
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};
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}
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/// ReplaceValueWith - The specified value was legalized to the specified other
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/// value. If they are different, update the DAG and NodeIds replacing any uses
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/// of From to use To instead.
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void DAGTypeLegalizer::ReplaceValueWith(SDValue From, SDValue To) {
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if (From == To) return;
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// If expansion produced new nodes, make sure they are properly marked.
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ExpungeNode(From.getNode());
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AnalyzeNewValue(To); // Expunges To.
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// Anything that used the old node should now use the new one. Note that this
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// can potentially cause recursive merging.
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NodeUpdateListener NUL(*this);
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DAG.ReplaceAllUsesOfValueWith(From, To, &NUL);
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// The old node may still be present in a map like ExpandedIntegers or
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// PromotedIntegers. Inform maps about the replacement.
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ReplacedValues[From] = To;
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}
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/// ReplaceNodeWith - Replace uses of the 'from' node's results with the 'to'
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/// node's results. The from and to node must define identical result types.
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void DAGTypeLegalizer::ReplaceNodeWith(SDNode *From, SDNode *To) {
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if (From == To) return;
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// If expansion produced new nodes, make sure they are properly marked.
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ExpungeNode(From);
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To = AnalyzeNewNode(To); // Expunges To.
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// If To morphed into an already processed node, its values may need
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// remapping. This is done below.
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assert(From->getNumValues() == To->getNumValues() &&
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"Node results don't match");
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// Anything that used the old node should now use the new one. Note that this
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// can potentially cause recursive merging.
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NodeUpdateListener NUL(*this);
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for (unsigned i = 0, e = From->getNumValues(); i != e; ++i) {
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SDValue FromVal(From, i);
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SDValue ToVal(To, i);
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// AnalyzeNewNode may have morphed a new node into a processed node. Remap
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// values now.
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if (To->getNodeId() == Processed)
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RemapValue(ToVal);
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assert(FromVal.getValueType() == ToVal.getValueType() &&
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"Node results don't match!");
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// Make anything that used the old value use the new value.
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DAG.ReplaceAllUsesOfValueWith(FromVal, ToVal, &NUL);
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// The old node may still be present in a map like ExpandedIntegers or
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// PromotedIntegers. Inform maps about the replacement.
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ReplacedValues[FromVal] = ToVal;
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}
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}
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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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N = I->second;
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}
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assert(N.getNode()->getNodeId() != NewNode && "Mapped to unanalyzed node!");
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}
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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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/// one.
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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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return;
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// If N is not remapped by ReplacedValues then there is nothing to do.
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unsigned i, e;
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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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break;
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if (i == e)
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return;
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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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}
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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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}
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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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}
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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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}
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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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}
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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) {
|
|
assert(I->first.getNode() != N);
|
|
RemapValue(I->second.first);
|
|
RemapValue(I->second.second);
|
|
}
|
|
|
|
for (DenseMap<SDValue, SDValue>::iterator I = ReplacedValues.begin(),
|
|
E = ReplacedValues.end(); I != E; ++I)
|
|
RemapValue(I->second);
|
|
|
|
for (unsigned i = 0, e = N->getNumValues(); i != e; ++i)
|
|
ReplacedValues.erase(SDValue(N, i));
|
|
}
|
|
|
|
void DAGTypeLegalizer::SetPromotedInteger(SDValue Op, SDValue Result) {
|
|
AnalyzeNewValue(Result);
|
|
|
|
SDValue &OpEntry = PromotedIntegers[Op];
|
|
assert(OpEntry.getNode() == 0 && "Node is already promoted!");
|
|
OpEntry = Result;
|
|
}
|
|
|
|
void DAGTypeLegalizer::SetSoftenedFloat(SDValue Op, SDValue Result) {
|
|
AnalyzeNewValue(Result);
|
|
|
|
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);
|
|
|
|
SDValue &OpEntry = ScalarizedVectors[Op];
|
|
assert(OpEntry.getNode() == 0 && "Node is already scalarized!");
|
|
OpEntry = Result;
|
|
}
|
|
|
|
void DAGTypeLegalizer::GetExpandedInteger(SDValue Op, SDValue &Lo,
|
|
SDValue &Hi) {
|
|
std::pair<SDValue, SDValue> &Entry = ExpandedIntegers[Op];
|
|
RemapValue(Entry.first);
|
|
RemapValue(Entry.second);
|
|
assert(Entry.first.getNode() && "Operand isn't expanded");
|
|
Lo = Entry.first;
|
|
Hi = Entry.second;
|
|
}
|
|
|
|
void DAGTypeLegalizer::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);
|
|
|
|
// 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;
|
|
}
|
|
|
|
void DAGTypeLegalizer::GetExpandedFloat(SDValue Op, SDValue &Lo,
|
|
SDValue &Hi) {
|
|
std::pair<SDValue, SDValue> &Entry = ExpandedFloats[Op];
|
|
RemapValue(Entry.first);
|
|
RemapValue(Entry.second);
|
|
assert(Entry.first.getNode() && "Operand isn't expanded");
|
|
Lo = Entry.first;
|
|
Hi = Entry.second;
|
|
}
|
|
|
|
void DAGTypeLegalizer::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);
|
|
|
|
// 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;
|
|
}
|
|
|
|
void DAGTypeLegalizer::GetSplitVector(SDValue Op, SDValue &Lo,
|
|
SDValue &Hi) {
|
|
std::pair<SDValue, SDValue> &Entry = SplitVectors[Op];
|
|
RemapValue(Entry.first);
|
|
RemapValue(Entry.second);
|
|
assert(Entry.first.getNode() && "Operand isn't split");
|
|
Lo = Entry.first;
|
|
Hi = Entry.second;
|
|
}
|
|
|
|
void DAGTypeLegalizer::SetSplitVector(SDValue Op, SDValue Lo,
|
|
SDValue Hi) {
|
|
// Lo/Hi may have been newly allocated, if so, add nodeid's as relevant.
|
|
AnalyzeNewValue(Lo);
|
|
AnalyzeNewValue(Hi);
|
|
|
|
// Remember that this is the result of the node.
|
|
std::pair<SDValue, SDValue> &Entry = SplitVectors[Op];
|
|
assert(Entry.first.getNode() == 0 && "Node already split");
|
|
Entry.first = Lo;
|
|
Entry.second = Hi;
|
|
}
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Utilities.
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
/// 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, MVT::getIntegerVT(BitWidth), Op);
|
|
}
|
|
|
|
SDValue DAGTypeLegalizer::CreateStackStoreLoad(SDValue Op,
|
|
MVT DestVT) {
|
|
// Create the stack frame object. Make sure it is aligned for both
|
|
// the source and destination types.
|
|
unsigned SrcAlign =
|
|
TLI.getTargetData()->getPrefTypeAlignment(Op.getValueType().getTypeForMVT());
|
|
SDValue FIPtr = DAG.CreateStackTemporary(DestVT, SrcAlign);
|
|
|
|
// Emit a store to the stack slot.
|
|
SDValue 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.
|
|
SDValue DAGTypeLegalizer::JoinIntegers(SDValue Lo, SDValue Hi) {
|
|
MVT LVT = Lo.getValueType();
|
|
MVT HVT = Hi.getValueType();
|
|
MVT NVT = MVT::getIntegerVT(LVT.getSizeInBits() + HVT.getSizeInBits());
|
|
|
|
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(LVT.getSizeInBits(),
|
|
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(SDValue Op,
|
|
MVT LoVT, MVT HiVT,
|
|
SDValue &Lo, SDValue &Hi) {
|
|
assert(LoVT.getSizeInBits() + HiVT.getSizeInBits() ==
|
|
Op.getValueType().getSizeInBits() && "Invalid integer splitting!");
|
|
Lo = DAG.getNode(ISD::TRUNCATE, LoVT, Op);
|
|
Hi = DAG.getNode(ISD::SRL, Op.getValueType(), Op,
|
|
DAG.getConstant(LoVT.getSizeInBits(),
|
|
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(SDValue Op,
|
|
SDValue &Lo, SDValue &Hi) {
|
|
MVT HalfVT = MVT::getIntegerVT(Op.getValueType().getSizeInBits()/2);
|
|
SplitInteger(Op, HalfVT, HalfVT, Lo, Hi);
|
|
}
|
|
|
|
/// 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) {
|
|
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);
|
|
}
|
|
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);
|
|
return CallInfo.first;
|
|
}
|
|
|
|
/// 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();
|
|
if (NumOps == 0) {
|
|
return MakeLibCall(LC, N->getValueType(0), 0, 0, isSigned);
|
|
} else if (NumOps == 1) {
|
|
SDValue Op = N->getOperand(0);
|
|
return MakeLibCall(LC, N->getValueType(0), &Op, 1, isSigned);
|
|
} else if (NumOps == 2) {
|
|
SDValue Ops[2] = { N->getOperand(0), N->getOperand(1) };
|
|
return MakeLibCall(LC, N->getValueType(0), Ops, 2, isSigned);
|
|
}
|
|
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);
|
|
}
|
|
|
|
SDValue DAGTypeLegalizer::GetVectorElementPointer(SDValue VecPtr, MVT EltVT,
|
|
SDValue Index) {
|
|
// Make sure the index type is big enough to compute in.
|
|
if (Index.getValueType().bitsGT(TLI.getPointerTy()))
|
|
Index = DAG.getNode(ISD::TRUNCATE, TLI.getPointerTy(), Index);
|
|
else
|
|
Index = DAG.getNode(ISD::ZERO_EXTEND, 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, Index.getValueType(), Index,
|
|
DAG.getConstant(EltSize, Index.getValueType()));
|
|
return DAG.getNode(ISD::ADD, Index.getValueType(), Index, VecPtr);
|
|
}
|
|
|
|
/// 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);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// 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() {
|
|
DAGTypeLegalizer(*this).run();
|
|
}
|