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https://github.com/c64scene-ar/llvm-6502.git
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41400da31e
2. Parsing .word directive in MBlaze asm parser 3. Fixing hack where memory instructions reversed order of last two parameters 4. Fixing many improperly encoded instructions 5. Support parsing special instructions (MFS,MTS,etc.) 6. Removing unused functions from inst printer git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118941 91177308-0d34-0410-b5e6-96231b3b80d8
278 lines
9.6 KiB
C++
278 lines
9.6 KiB
C++
//===-- MBlazeISelDAGToDAG.cpp - A dag to dag inst selector for MBlaze ----===//
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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 defines an instruction selector for the MBlaze target.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "mblaze-isel"
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#include "MBlaze.h"
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#include "MBlazeMachineFunction.h"
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#include "MBlazeRegisterInfo.h"
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#include "MBlazeSubtarget.h"
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#include "MBlazeTargetMachine.h"
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#include "llvm/GlobalValue.h"
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#include "llvm/Instructions.h"
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#include "llvm/Intrinsics.h"
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#include "llvm/Support/CFG.h"
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#include "llvm/Type.h"
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#include "llvm/CodeGen/MachineConstantPool.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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#include "llvm/CodeGen/SelectionDAGISel.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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//===----------------------------------------------------------------------===//
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// Instruction Selector Implementation
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//===----------------------------------------------------------------------===//
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//===----------------------------------------------------------------------===//
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// MBlazeDAGToDAGISel - MBlaze specific code to select MBlaze machine
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// instructions for SelectionDAG operations.
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//===----------------------------------------------------------------------===//
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namespace {
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class MBlazeDAGToDAGISel : public SelectionDAGISel {
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/// TM - Keep a reference to MBlazeTargetMachine.
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MBlazeTargetMachine &TM;
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/// Subtarget - Keep a pointer to the MBlazeSubtarget around so that we can
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/// make the right decision when generating code for different targets.
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const MBlazeSubtarget &Subtarget;
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public:
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explicit MBlazeDAGToDAGISel(MBlazeTargetMachine &tm) :
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SelectionDAGISel(tm),
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TM(tm), Subtarget(tm.getSubtarget<MBlazeSubtarget>()) {}
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// Pass Name
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virtual const char *getPassName() const {
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return "MBlaze DAG->DAG Pattern Instruction Selection";
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}
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private:
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// Include the pieces autogenerated from the target description.
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#include "MBlazeGenDAGISel.inc"
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/// getTargetMachine - Return a reference to the TargetMachine, casted
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/// to the target-specific type.
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const MBlazeTargetMachine &getTargetMachine() {
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return static_cast<const MBlazeTargetMachine &>(TM);
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}
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/// getInstrInfo - Return a reference to the TargetInstrInfo, casted
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/// to the target-specific type.
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const MBlazeInstrInfo *getInstrInfo() {
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return getTargetMachine().getInstrInfo();
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}
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SDNode *getGlobalBaseReg();
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SDNode *Select(SDNode *N);
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// Address Selection
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bool SelectAddrRegReg(SDValue N, SDValue &Base, SDValue &Index);
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bool SelectAddrRegImm(SDValue N, SDValue &Disp, SDValue &Base);
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// getI32Imm - Return a target constant with the specified value, of type i32.
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inline SDValue getI32Imm(unsigned Imm) {
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return CurDAG->getTargetConstant(Imm, MVT::i32);
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}
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};
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}
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/// isIntS32Immediate - This method tests to see if the node is either a 32-bit
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/// or 64-bit immediate, and if the value can be accurately represented as a
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/// sign extension from a 32-bit value. If so, this returns true and the
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/// immediate.
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static bool isIntS32Immediate(SDNode *N, int32_t &Imm) {
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unsigned Opc = N->getOpcode();
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if (Opc != ISD::Constant)
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return false;
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Imm = (int32_t)cast<ConstantSDNode>(N)->getZExtValue();
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if (N->getValueType(0) == MVT::i32)
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return Imm == (int32_t)cast<ConstantSDNode>(N)->getZExtValue();
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else
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return Imm == (int64_t)cast<ConstantSDNode>(N)->getZExtValue();
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}
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static bool isIntS32Immediate(SDValue Op, int32_t &Imm) {
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return isIntS32Immediate(Op.getNode(), Imm);
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}
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/// SelectAddressRegReg - Given the specified addressed, check to see if it
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/// can be represented as an indexed [r+r] operation. Returns false if it
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/// can be more efficiently represented with [r+imm].
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bool MBlazeDAGToDAGISel::
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SelectAddrRegReg(SDValue N, SDValue &Base, SDValue &Index) {
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if (N.getOpcode() == ISD::FrameIndex) return false;
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if (N.getOpcode() == ISD::TargetExternalSymbol ||
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N.getOpcode() == ISD::TargetGlobalAddress)
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return false; // direct calls.
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int32_t imm = 0;
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if (N.getOpcode() == ISD::ADD || N.getOpcode() == ISD::OR) {
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if (isIntS32Immediate(N.getOperand(1), imm))
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return false; // r+i
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if (N.getOperand(0).getOpcode() == ISD::TargetJumpTable ||
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N.getOperand(1).getOpcode() == ISD::TargetJumpTable)
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return false; // jump tables.
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Base = N.getOperand(0);
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Index = N.getOperand(1);
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return true;
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}
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return false;
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}
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/// Returns true if the address N can be represented by a base register plus
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/// a signed 32-bit displacement [r+imm], and if it is not better
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/// represented as reg+reg.
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bool MBlazeDAGToDAGISel::
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SelectAddrRegImm(SDValue N, SDValue &Base, SDValue &Disp) {
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// If this can be more profitably realized as r+r, fail.
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if (SelectAddrRegReg(N, Base, Disp))
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return false;
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if (N.getOpcode() == ISD::ADD || N.getOpcode() == ISD::OR) {
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int32_t imm = 0;
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if (isIntS32Immediate(N.getOperand(1), imm)) {
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Disp = CurDAG->getTargetConstant(imm, MVT::i32);
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if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(N.getOperand(0))) {
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Base = CurDAG->getTargetFrameIndex(FI->getIndex(), N.getValueType());
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} else {
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Base = N.getOperand(0);
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}
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return true; // [r+i]
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}
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} else if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N)) {
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// Loading from a constant address.
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uint32_t Imm = CN->getZExtValue();
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Disp = CurDAG->getTargetConstant(Imm, CN->getValueType(0));
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Base = CurDAG->getRegister(MBlaze::R0, CN->getValueType(0));
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return true;
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}
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Disp = CurDAG->getTargetConstant(0, TM.getTargetLowering()->getPointerTy());
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if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(N))
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Base = CurDAG->getTargetFrameIndex(FI->getIndex(), N.getValueType());
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else
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Base = N;
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return true; // [r+0]
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}
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/// getGlobalBaseReg - Output the instructions required to put the
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/// GOT address into a register.
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SDNode *MBlazeDAGToDAGISel::getGlobalBaseReg() {
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unsigned GlobalBaseReg = getInstrInfo()->getGlobalBaseReg(MF);
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return CurDAG->getRegister(GlobalBaseReg, TLI.getPointerTy()).getNode();
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}
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/// Select instructions not customized! Used for
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/// expanded, promoted and normal instructions
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SDNode* MBlazeDAGToDAGISel::Select(SDNode *Node) {
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unsigned Opcode = Node->getOpcode();
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DebugLoc dl = Node->getDebugLoc();
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// If we have a custom node, we already have selected!
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if (Node->isMachineOpcode())
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return NULL;
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///
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// Instruction Selection not handled by the auto-generated
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// tablegen selection should be handled here.
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///
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switch (Opcode) {
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default: break;
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// Get target GOT address.
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case ISD::GLOBAL_OFFSET_TABLE:
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return getGlobalBaseReg();
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case ISD::FrameIndex: {
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SDValue imm = CurDAG->getTargetConstant(0, MVT::i32);
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int FI = dyn_cast<FrameIndexSDNode>(Node)->getIndex();
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EVT VT = Node->getValueType(0);
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SDValue TFI = CurDAG->getTargetFrameIndex(FI, VT);
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unsigned Opc = MBlaze::ADDI;
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if (Node->hasOneUse())
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return CurDAG->SelectNodeTo(Node, Opc, VT, TFI, imm);
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return CurDAG->getMachineNode(Opc, dl, VT, TFI, imm);
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}
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/// Handle direct and indirect calls when using PIC. On PIC, when
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/// GOT is smaller than about 64k (small code) the GA target is
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/// loaded with only one instruction. Otherwise GA's target must
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/// be loaded with 3 instructions.
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case MBlazeISD::JmpLink: {
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if (TM.getRelocationModel() == Reloc::PIC_) {
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SDValue Chain = Node->getOperand(0);
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SDValue Callee = Node->getOperand(1);
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SDValue R20Reg = CurDAG->getRegister(MBlaze::R20, MVT::i32);
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SDValue InFlag(0, 0);
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if ((isa<GlobalAddressSDNode>(Callee)) ||
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(isa<ExternalSymbolSDNode>(Callee)))
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{
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/// Direct call for global addresses and external symbols
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SDValue GPReg = CurDAG->getRegister(MBlaze::R15, MVT::i32);
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// Use load to get GOT target
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SDValue Ops[] = { Callee, GPReg, Chain };
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SDValue Load = SDValue(CurDAG->getMachineNode(MBlaze::LW, dl,
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MVT::i32, MVT::Other, Ops, 3), 0);
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Chain = Load.getValue(1);
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// Call target must be on T9
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Chain = CurDAG->getCopyToReg(Chain, dl, R20Reg, Load, InFlag);
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} else
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/// Indirect call
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Chain = CurDAG->getCopyToReg(Chain, dl, R20Reg, Callee, InFlag);
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// Emit Jump and Link Register
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SDNode *ResNode = CurDAG->getMachineNode(MBlaze::BRLID, dl, MVT::Other,
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MVT::Flag, R20Reg, Chain);
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Chain = SDValue(ResNode, 0);
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InFlag = SDValue(ResNode, 1);
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ReplaceUses(SDValue(Node, 0), Chain);
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ReplaceUses(SDValue(Node, 1), InFlag);
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return ResNode;
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}
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}
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}
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// Select the default instruction
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SDNode *ResNode = SelectCode(Node);
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DEBUG(errs() << "=> ");
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if (ResNode == NULL || ResNode == Node)
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DEBUG(Node->dump(CurDAG));
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else
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DEBUG(ResNode->dump(CurDAG));
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DEBUG(errs() << "\n");
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return ResNode;
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}
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/// createMBlazeISelDag - This pass converts a legalized DAG into a
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/// MBlaze-specific DAG, ready for instruction scheduling.
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FunctionPass *llvm::createMBlazeISelDag(MBlazeTargetMachine &TM) {
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return new MBlazeDAGToDAGISel(TM);
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}
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