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* Fix saving LR in function prologue

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* Adjust epilogue restore sequence to match the PowerPC documentation


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14480 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Misha Brukman 2004-06-29 17:14:42 +00:00
parent 218bec7bd3
commit e19ca38a32
1 changed files with 12 additions and 7 deletions
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19
lib/Target/PowerPC/PowerPCRegisterInfo.cpp
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@ -167,7 +167,7 @@ PowerPCRegisterInfo::eliminateFrameIndex(MachineFunction &MF,
if (!hasFP(MF))
Offset += MF.getFrameInfo()->getStackSize();
MI.SetMachineOperandConst(i-1, MachineOperand::MO_SignExtendedImmed, Offset);
MI.SetMachineOperandConst(i, MachineOperand::MO_SignExtendedImmed, Offset);
DEBUG(std::cerr << "offset = " << Offset << std::endl);
}
@ -200,9 +200,10 @@ void PowerPCRegisterInfo::emitPrologue(MachineFunction &MF) const {
NumBytes = ((NumBytes+4)+Align-1)/Align*Align - 4;
// Store the incoming LR so it is preserved across calls
MI = BuildMI(PPC32::MovePCtoLR, 0, PPC32::LR).addReg(PPC32::LR);
MI = BuildMI(PPC32::MFLR, 0, PPC32::R0);
MBB.insert(MBBI, MI);
MI = BuildMI(PPC32::MFSPR, 1, PPC32::R0).addImm(8);
MI = BuildMI(PPC32::STW, 3).addReg(PPC32::R31).addSImm(-4)
.addReg(PPC32::R1);
MBB.insert(MBBI, MI);
MI = BuildMI(PPC32::STW, 3).addReg(PPC32::R0).addSImm(8).addReg(PPC32::R1);
MBB.insert(MBBI, MI);
@ -229,18 +230,22 @@ void PowerPCRegisterInfo::emitEpilogue(MachineFunction &MF,
// Get the number of bytes allocated from the FrameInfo...
unsigned NumBytes = MFI->getStackSize();
// adjust stack pointer back: r1 += numbytes
// Read old LR from stack into R0
MI = BuildMI(PPC32::LWZ, 2, PPC32::R0).addSImm(8+NumBytes).addReg(PPC32::R1);
MBB.insert(MBBI, MI);
// Adjust stack pointer back: r1 += numbytes
if (NumBytes) {
MI =BuildMI(PPC32::ADDI, 2, PPC32::R1).addReg(PPC32::R1).addSImm(NumBytes);
MI = BuildMI(PPC32::ADDI, 2, PPC32::R1).addReg(PPC32::R1).addSImm(NumBytes);
MBB.insert(MBBI, MI);
}
// If we have calls, restore the LR value before we branch to it
if (MFI->hasCalls()) {
MI = BuildMI(PPC32::LWZ, 2, PPC32::R0).addSImm(8).addReg(PPC32::R1);
MBB.insert(MBBI, MI);
MI = BuildMI(PPC32::MTLR, 1).addReg(PPC32::R0);
MBB.insert(MBBI, MI);
MI = BuildMI(PPC32::LWZ, 2, PPC32::R31).addSImm(-4).addReg(PPC32::R1);
MBB.insert(MBBI, MI);
}
}