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https://github.com/RPCS3/llvm-mirror.git
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b8710ee43f
llvm-svn: 154764
501 lines
18 KiB
C++
501 lines
18 KiB
C++
//===-- LegalizeVectorOps.cpp - Implement SelectionDAG::LegalizeVectors ---===//
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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::LegalizeVectors method.
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//
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// The vector legalizer looks for vector operations which might need to be
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// scalarized and legalizes them. This is a separate step from Legalize because
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// scalarizing can introduce illegal types. For example, suppose we have an
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// ISD::SDIV of type v2i64 on x86-32. The type is legal (for example, addition
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// on a v2i64 is legal), but ISD::SDIV isn't legal, so we have to unroll the
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// operation, which introduces nodes with the illegal type i64 which must be
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// expanded. Similarly, suppose we have an ISD::SRA of type v16i8 on PowerPC;
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// the operation must be unrolled, which introduces nodes with the illegal
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// type i8 which must be promoted.
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//
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// This does not legalize vector manipulations like ISD::BUILD_VECTOR,
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// or operations that happen to take a vector which are custom-lowered;
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// the legalization for such operations never produces nodes
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// with illegal types, so it's okay to put off legalizing them until
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// SelectionDAG::Legalize runs.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/SelectionDAG.h"
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#include "llvm/Target/TargetLowering.h"
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using namespace llvm;
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namespace {
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class VectorLegalizer {
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SelectionDAG& DAG;
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const TargetLowering &TLI;
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bool Changed; // Keep track of whether anything changed
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/// LegalizedNodes - For nodes that are of legal width, and that have more
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/// than one use, this map indicates what regularized operand to use. This
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/// allows us to avoid legalizing the same thing more than once.
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DenseMap<SDValue, SDValue> LegalizedNodes;
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// Adds a node to the translation cache
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void AddLegalizedOperand(SDValue From, SDValue To) {
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LegalizedNodes.insert(std::make_pair(From, To));
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// If someone requests legalization of the new node, return itself.
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if (From != To)
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LegalizedNodes.insert(std::make_pair(To, To));
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}
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// Legalizes the given node
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SDValue LegalizeOp(SDValue Op);
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// Assuming the node is legal, "legalize" the results
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SDValue TranslateLegalizeResults(SDValue Op, SDValue Result);
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// Implements unrolling a VSETCC.
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SDValue UnrollVSETCC(SDValue Op);
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// Implements expansion for FNEG; falls back to UnrollVectorOp if FSUB
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// isn't legal.
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// Implements expansion for UINT_TO_FLOAT; falls back to UnrollVectorOp if
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// SINT_TO_FLOAT and SHR on vectors isn't legal.
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SDValue ExpandUINT_TO_FLOAT(SDValue Op);
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// Implement vselect in terms of XOR, AND, OR when blend is not supported
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// by the target.
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SDValue ExpandVSELECT(SDValue Op);
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SDValue ExpandLoad(SDValue Op);
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SDValue ExpandStore(SDValue Op);
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SDValue ExpandFNEG(SDValue Op);
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// Implements vector promotion; this is essentially just bitcasting the
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// operands to a different type and bitcasting the result back to the
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// original type.
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SDValue PromoteVectorOp(SDValue Op);
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public:
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bool Run();
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VectorLegalizer(SelectionDAG& dag) :
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DAG(dag), TLI(dag.getTargetLoweringInfo()), Changed(false) {}
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};
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bool VectorLegalizer::Run() {
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// The legalize process is inherently a bottom-up recursive process (users
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// legalize their uses before themselves). Given infinite stack space, we
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// could just start legalizing on the root and traverse the whole graph. In
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// practice however, this causes us to run out of stack space on large basic
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// blocks. To avoid this problem, compute an ordering of the nodes where each
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// node is only legalized after all of its operands are legalized.
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DAG.AssignTopologicalOrder();
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for (SelectionDAG::allnodes_iterator I = DAG.allnodes_begin(),
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E = prior(DAG.allnodes_end()); I != llvm::next(E); ++I)
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LegalizeOp(SDValue(I, 0));
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// Finally, it's possible the root changed. Get the new root.
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SDValue OldRoot = DAG.getRoot();
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assert(LegalizedNodes.count(OldRoot) && "Root didn't get legalized?");
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DAG.setRoot(LegalizedNodes[OldRoot]);
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LegalizedNodes.clear();
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// Remove dead nodes now.
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DAG.RemoveDeadNodes();
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return Changed;
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}
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SDValue VectorLegalizer::TranslateLegalizeResults(SDValue Op, SDValue Result) {
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// Generic legalization: just pass the operand through.
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for (unsigned i = 0, e = Op.getNode()->getNumValues(); i != e; ++i)
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AddLegalizedOperand(Op.getValue(i), Result.getValue(i));
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return Result.getValue(Op.getResNo());
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}
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SDValue VectorLegalizer::LegalizeOp(SDValue Op) {
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// Note that LegalizeOp may be reentered even from single-use nodes, which
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// means that we always must cache transformed nodes.
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DenseMap<SDValue, SDValue>::iterator I = LegalizedNodes.find(Op);
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if (I != LegalizedNodes.end()) return I->second;
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SDNode* Node = Op.getNode();
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// Legalize the operands
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SmallVector<SDValue, 8> Ops;
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for (unsigned i = 0, e = Node->getNumOperands(); i != e; ++i)
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Ops.push_back(LegalizeOp(Node->getOperand(i)));
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SDValue Result =
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SDValue(DAG.UpdateNodeOperands(Op.getNode(), Ops.data(), Ops.size()), 0);
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if (Op.getOpcode() == ISD::LOAD) {
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LoadSDNode *LD = cast<LoadSDNode>(Op.getNode());
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ISD::LoadExtType ExtType = LD->getExtensionType();
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if (LD->getMemoryVT().isVector() && ExtType != ISD::NON_EXTLOAD) {
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if (TLI.isLoadExtLegal(LD->getExtensionType(), LD->getMemoryVT()))
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return TranslateLegalizeResults(Op, Result);
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Changed = true;
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return LegalizeOp(ExpandLoad(Op));
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}
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} else if (Op.getOpcode() == ISD::STORE) {
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StoreSDNode *ST = cast<StoreSDNode>(Op.getNode());
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EVT StVT = ST->getMemoryVT();
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EVT ValVT = ST->getValue().getValueType();
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if (StVT.isVector() && ST->isTruncatingStore())
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switch (TLI.getTruncStoreAction(ValVT, StVT)) {
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default: llvm_unreachable("This action is not supported yet!");
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case TargetLowering::Legal:
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return TranslateLegalizeResults(Op, Result);
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case TargetLowering::Custom:
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Changed = true;
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return LegalizeOp(TLI.LowerOperation(Result, DAG));
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case TargetLowering::Expand:
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Changed = true;
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return LegalizeOp(ExpandStore(Op));
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}
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}
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bool HasVectorValue = false;
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for (SDNode::value_iterator J = Node->value_begin(), E = Node->value_end();
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J != E;
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++J)
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HasVectorValue |= J->isVector();
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if (!HasVectorValue)
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return TranslateLegalizeResults(Op, Result);
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EVT QueryType;
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switch (Op.getOpcode()) {
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default:
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return TranslateLegalizeResults(Op, Result);
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case ISD::ADD:
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case ISD::SUB:
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case ISD::MUL:
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case ISD::SDIV:
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case ISD::UDIV:
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case ISD::SREM:
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case ISD::UREM:
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case ISD::FADD:
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case ISD::FSUB:
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case ISD::FMUL:
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case ISD::FDIV:
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case ISD::FREM:
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case ISD::AND:
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case ISD::OR:
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case ISD::XOR:
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case ISD::SHL:
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case ISD::SRA:
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case ISD::SRL:
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case ISD::ROTL:
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case ISD::ROTR:
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case ISD::CTLZ:
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case ISD::CTTZ:
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case ISD::CTLZ_ZERO_UNDEF:
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case ISD::CTTZ_ZERO_UNDEF:
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case ISD::CTPOP:
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case ISD::SELECT:
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case ISD::VSELECT:
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case ISD::SELECT_CC:
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case ISD::SETCC:
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case ISD::ZERO_EXTEND:
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case ISD::ANY_EXTEND:
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case ISD::TRUNCATE:
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case ISD::SIGN_EXTEND:
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case ISD::FP_TO_SINT:
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case ISD::FP_TO_UINT:
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case ISD::FNEG:
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case ISD::FABS:
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case ISD::FSQRT:
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case ISD::FSIN:
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case ISD::FCOS:
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case ISD::FPOWI:
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case ISD::FPOW:
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case ISD::FLOG:
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case ISD::FLOG2:
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case ISD::FLOG10:
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case ISD::FEXP:
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case ISD::FEXP2:
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case ISD::FCEIL:
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case ISD::FTRUNC:
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case ISD::FRINT:
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case ISD::FNEARBYINT:
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case ISD::FFLOOR:
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case ISD::SIGN_EXTEND_INREG:
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QueryType = Node->getValueType(0);
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break;
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case ISD::FP_ROUND_INREG:
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QueryType = cast<VTSDNode>(Node->getOperand(1))->getVT();
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break;
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case ISD::SINT_TO_FP:
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case ISD::UINT_TO_FP:
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QueryType = Node->getOperand(0).getValueType();
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break;
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}
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switch (TLI.getOperationAction(Node->getOpcode(), QueryType)) {
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case TargetLowering::Promote:
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// "Promote" the operation by bitcasting
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Result = PromoteVectorOp(Op);
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Changed = true;
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break;
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case TargetLowering::Legal: break;
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case TargetLowering::Custom: {
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SDValue Tmp1 = TLI.LowerOperation(Op, DAG);
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if (Tmp1.getNode()) {
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Result = Tmp1;
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break;
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}
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// FALL THROUGH
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}
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case TargetLowering::Expand:
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if (Node->getOpcode() == ISD::VSELECT)
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Result = ExpandVSELECT(Op);
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else if (Node->getOpcode() == ISD::UINT_TO_FP)
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Result = ExpandUINT_TO_FLOAT(Op);
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else if (Node->getOpcode() == ISD::FNEG)
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Result = ExpandFNEG(Op);
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else if (Node->getOpcode() == ISD::SETCC)
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Result = UnrollVSETCC(Op);
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else
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Result = DAG.UnrollVectorOp(Op.getNode());
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break;
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}
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// Make sure that the generated code is itself legal.
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if (Result != Op) {
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Result = LegalizeOp(Result);
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Changed = true;
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}
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// Note that LegalizeOp may be reentered even from single-use nodes, which
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// means that we always must cache transformed nodes.
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AddLegalizedOperand(Op, Result);
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return Result;
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}
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SDValue VectorLegalizer::PromoteVectorOp(SDValue Op) {
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// Vector "promotion" is basically just bitcasting and doing the operation
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// in a different type. For example, x86 promotes ISD::AND on v2i32 to
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// v1i64.
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EVT VT = Op.getValueType();
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assert(Op.getNode()->getNumValues() == 1 &&
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"Can't promote a vector with multiple results!");
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EVT NVT = TLI.getTypeToPromoteTo(Op.getOpcode(), VT);
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DebugLoc dl = Op.getDebugLoc();
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SmallVector<SDValue, 4> Operands(Op.getNumOperands());
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for (unsigned j = 0; j != Op.getNumOperands(); ++j) {
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if (Op.getOperand(j).getValueType().isVector())
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Operands[j] = DAG.getNode(ISD::BITCAST, dl, NVT, Op.getOperand(j));
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else
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Operands[j] = Op.getOperand(j);
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}
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Op = DAG.getNode(Op.getOpcode(), dl, NVT, &Operands[0], Operands.size());
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return DAG.getNode(ISD::BITCAST, dl, VT, Op);
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}
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SDValue VectorLegalizer::ExpandLoad(SDValue Op) {
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DebugLoc dl = Op.getDebugLoc();
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LoadSDNode *LD = cast<LoadSDNode>(Op.getNode());
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SDValue Chain = LD->getChain();
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SDValue BasePTR = LD->getBasePtr();
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EVT SrcVT = LD->getMemoryVT();
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ISD::LoadExtType ExtType = LD->getExtensionType();
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SmallVector<SDValue, 8> LoadVals;
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SmallVector<SDValue, 8> LoadChains;
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unsigned NumElem = SrcVT.getVectorNumElements();
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unsigned Stride = SrcVT.getScalarType().getSizeInBits()/8;
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for (unsigned Idx=0; Idx<NumElem; Idx++) {
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SDValue ScalarLoad = DAG.getExtLoad(ExtType, dl,
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Op.getNode()->getValueType(0).getScalarType(),
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Chain, BasePTR, LD->getPointerInfo().getWithOffset(Idx * Stride),
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SrcVT.getScalarType(),
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LD->isVolatile(), LD->isNonTemporal(),
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LD->getAlignment());
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BasePTR = DAG.getNode(ISD::ADD, dl, BasePTR.getValueType(), BasePTR,
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DAG.getIntPtrConstant(Stride));
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LoadVals.push_back(ScalarLoad.getValue(0));
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LoadChains.push_back(ScalarLoad.getValue(1));
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}
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SDValue NewChain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
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&LoadChains[0], LoadChains.size());
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SDValue Value = DAG.getNode(ISD::BUILD_VECTOR, dl,
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Op.getNode()->getValueType(0), &LoadVals[0], LoadVals.size());
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AddLegalizedOperand(Op.getValue(0), Value);
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AddLegalizedOperand(Op.getValue(1), NewChain);
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return (Op.getResNo() ? NewChain : Value);
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}
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SDValue VectorLegalizer::ExpandStore(SDValue Op) {
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DebugLoc dl = Op.getDebugLoc();
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StoreSDNode *ST = cast<StoreSDNode>(Op.getNode());
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SDValue Chain = ST->getChain();
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SDValue BasePTR = ST->getBasePtr();
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SDValue Value = ST->getValue();
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EVT StVT = ST->getMemoryVT();
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unsigned Alignment = ST->getAlignment();
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bool isVolatile = ST->isVolatile();
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bool isNonTemporal = ST->isNonTemporal();
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unsigned NumElem = StVT.getVectorNumElements();
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// The type of the data we want to save
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EVT RegVT = Value.getValueType();
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EVT RegSclVT = RegVT.getScalarType();
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// The type of data as saved in memory.
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EVT MemSclVT = StVT.getScalarType();
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// Cast floats into integers
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unsigned ScalarSize = MemSclVT.getSizeInBits();
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// Round odd types to the next pow of two.
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if (!isPowerOf2_32(ScalarSize))
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ScalarSize = NextPowerOf2(ScalarSize);
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// Store Stride in bytes
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unsigned Stride = ScalarSize/8;
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// Extract each of the elements from the original vector
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// and save them into memory individually.
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SmallVector<SDValue, 8> Stores;
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for (unsigned Idx = 0; Idx < NumElem; Idx++) {
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SDValue Ex = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl,
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RegSclVT, Value, DAG.getIntPtrConstant(Idx));
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// This scalar TruncStore may be illegal, but we legalize it later.
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SDValue Store = DAG.getTruncStore(Chain, dl, Ex, BasePTR,
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ST->getPointerInfo().getWithOffset(Idx*Stride), MemSclVT,
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isVolatile, isNonTemporal, Alignment);
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BasePTR = DAG.getNode(ISD::ADD, dl, BasePTR.getValueType(), BasePTR,
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DAG.getIntPtrConstant(Stride));
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Stores.push_back(Store);
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}
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SDValue TF = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
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&Stores[0], Stores.size());
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AddLegalizedOperand(Op, TF);
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return TF;
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}
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SDValue VectorLegalizer::ExpandVSELECT(SDValue Op) {
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// Implement VSELECT in terms of XOR, AND, OR
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// on platforms which do not support blend natively.
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EVT VT = Op.getOperand(0).getValueType();
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DebugLoc DL = Op.getDebugLoc();
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SDValue Mask = Op.getOperand(0);
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SDValue Op1 = Op.getOperand(1);
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SDValue Op2 = Op.getOperand(2);
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// If we can't even use the basic vector operations of
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// AND,OR,XOR, we will have to scalarize the op.
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// Notice that the operation may be 'promoted' which means that it is
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// 'bitcasted' to another type which is handled.
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if (TLI.getOperationAction(ISD::AND, VT) == TargetLowering::Expand ||
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TLI.getOperationAction(ISD::XOR, VT) == TargetLowering::Expand ||
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TLI.getOperationAction(ISD::OR, VT) == TargetLowering::Expand)
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return DAG.UnrollVectorOp(Op.getNode());
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assert(VT.getSizeInBits() == Op.getOperand(1).getValueType().getSizeInBits()
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&& "Invalid mask size");
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// Bitcast the operands to be the same type as the mask.
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// This is needed when we select between FP types because
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// the mask is a vector of integers.
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Op1 = DAG.getNode(ISD::BITCAST, DL, VT, Op1);
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Op2 = DAG.getNode(ISD::BITCAST, DL, VT, Op2);
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SDValue AllOnes = DAG.getConstant(
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APInt::getAllOnesValue(VT.getScalarType().getSizeInBits()), VT);
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SDValue NotMask = DAG.getNode(ISD::XOR, DL, VT, Mask, AllOnes);
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Op1 = DAG.getNode(ISD::AND, DL, VT, Op1, Mask);
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Op2 = DAG.getNode(ISD::AND, DL, VT, Op2, NotMask);
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SDValue Val = DAG.getNode(ISD::OR, DL, VT, Op1, Op2);
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return DAG.getNode(ISD::BITCAST, DL, Op.getValueType(), Val);
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}
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SDValue VectorLegalizer::ExpandUINT_TO_FLOAT(SDValue Op) {
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EVT VT = Op.getOperand(0).getValueType();
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DebugLoc DL = Op.getDebugLoc();
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// Make sure that the SINT_TO_FP and SRL instructions are available.
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if (TLI.getOperationAction(ISD::SINT_TO_FP, VT) == TargetLowering::Expand ||
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TLI.getOperationAction(ISD::SRL, VT) == TargetLowering::Expand)
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return DAG.UnrollVectorOp(Op.getNode());
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EVT SVT = VT.getScalarType();
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assert((SVT.getSizeInBits() == 64 || SVT.getSizeInBits() == 32) &&
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"Elements in vector-UINT_TO_FP must be 32 or 64 bits wide");
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unsigned BW = SVT.getSizeInBits();
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SDValue HalfWord = DAG.getConstant(BW/2, VT);
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// Constants to clear the upper part of the word.
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// Notice that we can also use SHL+SHR, but using a constant is slightly
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// faster on x86.
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uint64_t HWMask = (SVT.getSizeInBits()==64)?0x00000000FFFFFFFF:0x0000FFFF;
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SDValue HalfWordMask = DAG.getConstant(HWMask, VT);
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// Two to the power of half-word-size.
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SDValue TWOHW = DAG.getConstantFP((1<<(BW/2)), Op.getValueType());
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// Clear upper part of LO, lower HI
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SDValue HI = DAG.getNode(ISD::SRL, DL, VT, Op.getOperand(0), HalfWord);
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SDValue LO = DAG.getNode(ISD::AND, DL, VT, Op.getOperand(0), HalfWordMask);
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|
|
|
// Convert hi and lo to floats
|
|
// Convert the hi part back to the upper values
|
|
SDValue fHI = DAG.getNode(ISD::SINT_TO_FP, DL, Op.getValueType(), HI);
|
|
fHI = DAG.getNode(ISD::FMUL, DL, Op.getValueType(), fHI, TWOHW);
|
|
SDValue fLO = DAG.getNode(ISD::SINT_TO_FP, DL, Op.getValueType(), LO);
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|
|
|
// Add the two halves
|
|
return DAG.getNode(ISD::FADD, DL, Op.getValueType(), fHI, fLO);
|
|
}
|
|
|
|
|
|
SDValue VectorLegalizer::ExpandFNEG(SDValue Op) {
|
|
if (TLI.isOperationLegalOrCustom(ISD::FSUB, Op.getValueType())) {
|
|
SDValue Zero = DAG.getConstantFP(-0.0, Op.getValueType());
|
|
return DAG.getNode(ISD::FSUB, Op.getDebugLoc(), Op.getValueType(),
|
|
Zero, Op.getOperand(0));
|
|
}
|
|
return DAG.UnrollVectorOp(Op.getNode());
|
|
}
|
|
|
|
SDValue VectorLegalizer::UnrollVSETCC(SDValue Op) {
|
|
EVT VT = Op.getValueType();
|
|
unsigned NumElems = VT.getVectorNumElements();
|
|
EVT EltVT = VT.getVectorElementType();
|
|
SDValue LHS = Op.getOperand(0), RHS = Op.getOperand(1), CC = Op.getOperand(2);
|
|
EVT TmpEltVT = LHS.getValueType().getVectorElementType();
|
|
DebugLoc dl = Op.getDebugLoc();
|
|
SmallVector<SDValue, 8> Ops(NumElems);
|
|
for (unsigned i = 0; i < NumElems; ++i) {
|
|
SDValue LHSElem = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, TmpEltVT, LHS,
|
|
DAG.getIntPtrConstant(i));
|
|
SDValue RHSElem = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, TmpEltVT, RHS,
|
|
DAG.getIntPtrConstant(i));
|
|
Ops[i] = DAG.getNode(ISD::SETCC, dl, TLI.getSetCCResultType(TmpEltVT),
|
|
LHSElem, RHSElem, CC);
|
|
Ops[i] = DAG.getNode(ISD::SELECT, dl, EltVT, Ops[i],
|
|
DAG.getConstant(APInt::getAllOnesValue
|
|
(EltVT.getSizeInBits()), EltVT),
|
|
DAG.getConstant(0, EltVT));
|
|
}
|
|
return DAG.getNode(ISD::BUILD_VECTOR, dl, VT, &Ops[0], NumElems);
|
|
}
|
|
|
|
}
|
|
|
|
bool SelectionDAG::LegalizeVectors() {
|
|
return VectorLegalizer(*this).Run();
|
|
}
|