Set up the prologue and epilogue to be more like the manual and GCC output.
llvm-svn: 14502
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parent
7454c6fff0
commit
d409669877
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@ -202,7 +202,7 @@ void PowerPCRegisterInfo::emitPrologue(MachineFunction &MF) const {
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// Store the incoming LR so it is preserved across calls
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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::STW, 3).addReg(PPC32::R31).addSImm(-4)
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MI = BuildMI(PPC32::STMW, 3).addReg(PPC32::R30).addSImm(-8)
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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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@ -214,7 +214,7 @@ void PowerPCRegisterInfo::emitPrologue(MachineFunction &MF) const {
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// adjust stack pointer: r1 -= numbytes
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if (NumBytes) {
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MI = BuildMI(PPC32::STWU, 2, PPC32::R1).addImm(-NumBytes).addReg(PPC32::R1);
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MI = BuildMI(PPC32::STWU, 2, PPC32::R1).addImm(-80).addReg(PPC32::R1);
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MBB.insert(MBBI, MI);
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}
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}
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@ -230,21 +230,18 @@ 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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// 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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// Adjust stack pointer back
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MI = BuildMI(PPC32::LWZ, 2, PPC32::R1).addImm(0).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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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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// Read old LR from stack into R0
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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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MI = BuildMI(PPC32::LMW, 2, PPC32::R30).addSImm(-8).addReg(PPC32::R1);
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MBB.insert(MBBI, MI);
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}
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}
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