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* Fix saving LR in function prologue
* 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
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@ -167,7 +167,7 @@ PowerPCRegisterInfo::eliminateFrameIndex(MachineFunction &MF,
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if (!hasFP(MF))
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Offset += MF.getFrameInfo()->getStackSize();
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MI.SetMachineOperandConst(i-1, MachineOperand::MO_SignExtendedImmed, Offset);
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MI.SetMachineOperandConst(i, MachineOperand::MO_SignExtendedImmed, Offset);
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DEBUG(std::cerr << "offset = " << Offset << std::endl);
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}
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@ -200,9 +200,10 @@ void PowerPCRegisterInfo::emitPrologue(MachineFunction &MF) const {
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NumBytes = ((NumBytes+4)+Align-1)/Align*Align - 4;
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// Store the incoming LR so it is preserved across calls
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MI = BuildMI(PPC32::MovePCtoLR, 0, PPC32::LR).addReg(PPC32::LR);
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MI = BuildMI(PPC32::MFLR, 0, PPC32::R0);
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MBB.insert(MBBI, MI);
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MI = BuildMI(PPC32::MFSPR, 1, PPC32::R0).addImm(8);
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MI = BuildMI(PPC32::STW, 3).addReg(PPC32::R31).addSImm(-4)
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.addReg(PPC32::R1);
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MBB.insert(MBBI, MI);
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MI = BuildMI(PPC32::STW, 3).addReg(PPC32::R0).addSImm(8).addReg(PPC32::R1);
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MBB.insert(MBBI, MI);
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@ -229,18 +230,22 @@ void PowerPCRegisterInfo::emitEpilogue(MachineFunction &MF,
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// Get the number of bytes allocated from the FrameInfo...
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unsigned NumBytes = MFI->getStackSize();
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// adjust stack pointer back: r1 += numbytes
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// Read old LR from stack into R0
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MI = BuildMI(PPC32::LWZ, 2, PPC32::R0).addSImm(8+NumBytes).addReg(PPC32::R1);
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MBB.insert(MBBI, MI);
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// Adjust stack pointer back: r1 += numbytes
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if (NumBytes) {
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MI =BuildMI(PPC32::ADDI, 2, PPC32::R1).addReg(PPC32::R1).addSImm(NumBytes);
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MI = BuildMI(PPC32::ADDI, 2, PPC32::R1).addReg(PPC32::R1).addSImm(NumBytes);
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MBB.insert(MBBI, MI);
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}
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// If we have calls, restore the LR value before we branch to it
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if (MFI->hasCalls()) {
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MI = BuildMI(PPC32::LWZ, 2, PPC32::R0).addSImm(8).addReg(PPC32::R1);
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MBB.insert(MBBI, MI);
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MI = BuildMI(PPC32::MTLR, 1).addReg(PPC32::R0);
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MBB.insert(MBBI, MI);
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MI = BuildMI(PPC32::LWZ, 2, PPC32::R31).addSImm(-4).addReg(PPC32::R1);
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MBB.insert(MBBI, MI);
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}
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}
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