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267 lines
9.2 KiB
C++
267 lines
9.2 KiB
C++
//=======- MBlazeFrameInfo.cpp - MBlaze Frame Information ------*- C++ -*-====//
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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 contains the MBlaze implementation of TargetFrameInfo class.
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//
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//===----------------------------------------------------------------------===//
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#include "MBlazeFrameInfo.h"
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#include "MBlazeInstrInfo.h"
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#include "MBlazeMachineFunction.h"
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#include "InstPrinter/MBlazeInstPrinter.h"
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#include "llvm/Function.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include "llvm/CodeGen/MachineModuleInfo.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetOptions.h"
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#include "llvm/Support/CommandLine.h"
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using namespace llvm;
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namespace llvm {
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cl::opt<bool> DisableStackAdjust(
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"disable-mblaze-stack-adjust",
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cl::init(false),
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cl::desc("Disable MBlaze stack layout adjustment."),
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cl::Hidden);
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}
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//===----------------------------------------------------------------------===//
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//
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// Stack Frame Processing methods
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// +----------------------------+
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//
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// The stack is allocated decrementing the stack pointer on
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// the first instruction of a function prologue. Once decremented,
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// all stack references are are done through a positive offset
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// from the stack/frame pointer, so the stack is considered
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// to grow up.
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//
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//===----------------------------------------------------------------------===//
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static void analyzeFrameIndexes(MachineFunction &MF) {
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if (DisableStackAdjust) return;
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MachineFrameInfo *MFI = MF.getFrameInfo();
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MBlazeFunctionInfo *MBlazeFI = MF.getInfo<MBlazeFunctionInfo>();
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const MachineRegisterInfo &MRI = MF.getRegInfo();
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MachineRegisterInfo::livein_iterator LII = MRI.livein_begin();
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MachineRegisterInfo::livein_iterator LIE = MRI.livein_end();
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const SmallVector<int, 16> &LiveInFI = MBlazeFI->getLiveIn();
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SmallVector<MachineInstr*, 16> EraseInstr;
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MachineBasicBlock *MBB = MF.getBlockNumbered(0);
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MachineBasicBlock::iterator MIB = MBB->begin();
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MachineBasicBlock::iterator MIE = MBB->end();
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int StackAdjust = 0;
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int StackOffset = -28;
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for (unsigned i = 0, e = LiveInFI.size(); i < e; ++i) {
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for (MachineBasicBlock::iterator I=MIB; I != MIE; ++I) {
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if (I->getOpcode() != MBlaze::LWI || I->getNumOperands() != 3 ||
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!I->getOperand(1).isFI() || !I->getOperand(0).isReg() ||
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I->getOperand(1).getIndex() != LiveInFI[i]) continue;
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unsigned FIReg = I->getOperand(0).getReg();
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MachineBasicBlock::iterator SI = I;
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for (SI++; SI != MIE; ++SI) {
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if (!SI->getOperand(0).isReg()) continue;
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if (!SI->getOperand(1).isFI()) continue;
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if (SI->getOpcode() != MBlaze::SWI) continue;
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int FI = SI->getOperand(1).getIndex();
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if (SI->getOperand(0).getReg() != FIReg) continue;
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if (MFI->isFixedObjectIndex(FI)) continue;
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if (MFI->getObjectSize(FI) != 4) continue;
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if (SI->getOperand(0).isDef()) break;
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if (SI->getOperand(0).isKill())
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EraseInstr.push_back(I);
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EraseInstr.push_back(SI);
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MBlazeFI->recordLoadArgsFI(FI, StackOffset);
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StackOffset -= 4;
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StackAdjust += 4;
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break;
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}
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}
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}
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for (MachineBasicBlock::iterator I=MBB->begin(), E=MBB->end(); I != E; ++I) {
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if (I->getOpcode() != MBlaze::SWI || I->getNumOperands() != 3 ||
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!I->getOperand(1).isFI() || !I->getOperand(0).isReg() ||
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I->getOperand(1).getIndex() < 0) continue;
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unsigned FIReg = 0;
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for (MachineRegisterInfo::livein_iterator LI = LII; LI != LIE; ++LI) {
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if (I->getOperand(0).getReg() == LI->first) {
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FIReg = LI->first;
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break;
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}
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}
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if (FIReg) {
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int FI = I->getOperand(1).getIndex();
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MBlazeFI->recordLiveIn(FI);
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StackAdjust += 4;
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switch (FIReg) {
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default: llvm_unreachable("invalid incoming parameter!");
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case MBlaze::R5: MBlazeFI->recordLoadArgsFI(FI, -4); break;
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case MBlaze::R6: MBlazeFI->recordLoadArgsFI(FI, -8); break;
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case MBlaze::R7: MBlazeFI->recordLoadArgsFI(FI, -12); break;
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case MBlaze::R8: MBlazeFI->recordLoadArgsFI(FI, -16); break;
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case MBlaze::R9: MBlazeFI->recordLoadArgsFI(FI, -20); break;
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case MBlaze::R10: MBlazeFI->recordLoadArgsFI(FI, -24); break;
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}
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}
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}
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for (int i = 0, e = EraseInstr.size(); i < e; ++i)
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MBB->erase(EraseInstr[i]);
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MBlazeFI->setStackAdjust(StackAdjust);
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}
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static void determineFrameLayout(MachineFunction &MF) {
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MachineFrameInfo *MFI = MF.getFrameInfo();
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MBlazeFunctionInfo *MBlazeFI = MF.getInfo<MBlazeFunctionInfo>();
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// Replace the dummy '0' SPOffset by the negative offsets, as explained on
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// LowerFORMAL_ARGUMENTS. Leaving '0' for while is necessary to avoid
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// the approach done by calculateFrameObjectOffsets to the stack frame.
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MBlazeFI->adjustLoadArgsFI(MFI);
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MBlazeFI->adjustStoreVarArgsFI(MFI);
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// Get the number of bytes to allocate from the FrameInfo
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unsigned FrameSize = MFI->getStackSize();
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FrameSize -= MBlazeFI->getStackAdjust();
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// Get the alignments provided by the target, and the maximum alignment
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// (if any) of the fixed frame objects.
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// unsigned MaxAlign = MFI->getMaxAlignment();
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unsigned TargetAlign = MF.getTarget().getFrameInfo()->getStackAlignment();
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unsigned AlignMask = TargetAlign - 1;
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// Make sure the frame is aligned.
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FrameSize = (FrameSize + AlignMask) & ~AlignMask;
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MFI->setStackSize(FrameSize);
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}
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// hasFP - Return true if the specified function should have a dedicated frame
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// pointer register. This is true if the function has variable sized allocas or
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// if frame pointer elimination is disabled.
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bool MBlazeFrameInfo::hasFP(const MachineFunction &MF) const {
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const MachineFrameInfo *MFI = MF.getFrameInfo();
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return DisableFramePointerElim(MF) || MFI->hasVarSizedObjects();
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}
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void MBlazeFrameInfo::emitPrologue(MachineFunction &MF) const {
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MachineBasicBlock &MBB = MF.front();
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MachineFrameInfo *MFI = MF.getFrameInfo();
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const MBlazeInstrInfo &TII =
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*static_cast<const MBlazeInstrInfo*>(MF.getTarget().getInstrInfo());
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MBlazeFunctionInfo *MBlazeFI = MF.getInfo<MBlazeFunctionInfo>();
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MachineBasicBlock::iterator MBBI = MBB.begin();
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DebugLoc DL = MBBI != MBB.end() ? MBBI->getDebugLoc() : DebugLoc();
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// Determine the correct frame layout
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determineFrameLayout(MF);
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// Get the number of bytes to allocate from the FrameInfo.
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unsigned StackSize = MFI->getStackSize();
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// No need to allocate space on the stack.
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if (StackSize == 0 && !MFI->adjustsStack()) return;
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int FPOffset = MBlazeFI->getFPStackOffset();
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int RAOffset = MBlazeFI->getRAStackOffset();
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// Adjust stack : addi R1, R1, -imm
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BuildMI(MBB, MBBI, DL, TII.get(MBlaze::ADDIK), MBlaze::R1)
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.addReg(MBlaze::R1).addImm(-StackSize);
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// swi R15, R1, stack_loc
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if (MFI->adjustsStack()) {
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BuildMI(MBB, MBBI, DL, TII.get(MBlaze::SWI))
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.addReg(MBlaze::R15).addReg(MBlaze::R1).addImm(RAOffset);
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}
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if (hasFP(MF)) {
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// swi R19, R1, stack_loc
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BuildMI(MBB, MBBI, DL, TII.get(MBlaze::SWI))
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.addReg(MBlaze::R19).addReg(MBlaze::R1).addImm(FPOffset);
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// add R19, R1, R0
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BuildMI(MBB, MBBI, DL, TII.get(MBlaze::ADD), MBlaze::R19)
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.addReg(MBlaze::R1).addReg(MBlaze::R0);
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}
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}
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void MBlazeFrameInfo::emitEpilogue(MachineFunction &MF,
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MachineBasicBlock &MBB) const {
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MachineBasicBlock::iterator MBBI = prior(MBB.end());
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MachineFrameInfo *MFI = MF.getFrameInfo();
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MBlazeFunctionInfo *MBlazeFI = MF.getInfo<MBlazeFunctionInfo>();
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const MBlazeInstrInfo &TII =
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*static_cast<const MBlazeInstrInfo*>(MF.getTarget().getInstrInfo());
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DebugLoc dl = MBBI->getDebugLoc();
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// Get the FI's where RA and FP are saved.
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int FPOffset = MBlazeFI->getFPStackOffset();
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int RAOffset = MBlazeFI->getRAStackOffset();
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if (hasFP(MF)) {
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// add R1, R19, R0
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BuildMI(MBB, MBBI, dl, TII.get(MBlaze::ADD), MBlaze::R1)
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.addReg(MBlaze::R19).addReg(MBlaze::R0);
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// lwi R19, R1, stack_loc
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BuildMI(MBB, MBBI, dl, TII.get(MBlaze::LWI), MBlaze::R19)
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.addReg(MBlaze::R1).addImm(FPOffset);
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}
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// lwi R15, R1, stack_loc
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if (MFI->adjustsStack()) {
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BuildMI(MBB, MBBI, dl, TII.get(MBlaze::LWI), MBlaze::R15)
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.addReg(MBlaze::R1).addImm(RAOffset);
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}
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// Get the number of bytes from FrameInfo
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int StackSize = (int) MFI->getStackSize();
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// addi R1, R1, imm
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if (StackSize) {
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BuildMI(MBB, MBBI, dl, TII.get(MBlaze::ADDIK), MBlaze::R1)
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.addReg(MBlaze::R1).addImm(StackSize);
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}
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}
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void MBlazeFrameInfo::processFunctionBeforeCalleeSavedScan(MachineFunction &MF, RegScavenger *RS)
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const {
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MachineFrameInfo *MFI = MF.getFrameInfo();
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MBlazeFunctionInfo *MBlazeFI = MF.getInfo<MBlazeFunctionInfo>();
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if (MFI->adjustsStack()) {
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MBlazeFI->setRAStackOffset(0);
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MFI->CreateFixedObject(4,0,true);
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}
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if (hasFP(MF)) {
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MBlazeFI->setFPStackOffset(4);
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MFI->CreateFixedObject(4,4,true);
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}
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analyzeFrameIndexes(MF);
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}
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