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Set up the prologue and epilogue to be more like the manual and GCC output. 

llvm-svn: 14502
This commit is contained in:
Misha Brukman 2004-06-29 23:38:26 +00:00
parent 7454c6fff0
commit d409669877
1 changed files with 8 additions and 11 deletions
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19
llvm/lib/Target/PowerPC/PowerPCRegisterInfo.cpp
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@ -202,7 +202,7 @@ void PowerPCRegisterInfo::emitPrologue(MachineFunction &MF) const {
// Store the incoming LR so it is preserved across calls // Store the incoming LR so it is preserved across calls
MI = BuildMI(PPC32::MFLR, 0, PPC32::R0); MI = BuildMI(PPC32::MFLR, 0, PPC32::R0);
MBB.insert(MBBI, MI); MBB.insert(MBBI, MI);
MI = BuildMI(PPC32::STW, 3).addReg(PPC32::R31).addSImm(-4) MI = BuildMI(PPC32::STMW, 3).addReg(PPC32::R30).addSImm(-8)
.addReg(PPC32::R1); .addReg(PPC32::R1);
MBB.insert(MBBI, MI); MBB.insert(MBBI, MI);
MI = BuildMI(PPC32::STW, 3).addReg(PPC32::R0).addSImm(8).addReg(PPC32::R1); MI = BuildMI(PPC32::STW, 3).addReg(PPC32::R0).addSImm(8).addReg(PPC32::R1);
@ -214,7 +214,7 @@ void PowerPCRegisterInfo::emitPrologue(MachineFunction &MF) const {
// adjust stack pointer: r1 -= numbytes // adjust stack pointer: r1 -= numbytes
if (NumBytes) { if (NumBytes) {
MI = BuildMI(PPC32::STWU, 2, PPC32::R1).addImm(-NumBytes).addReg(PPC32::R1); MI = BuildMI(PPC32::STWU, 2, PPC32::R1).addImm(-80).addReg(PPC32::R1);
MBB.insert(MBBI, MI); MBB.insert(MBBI, MI);
} }
} }
@ -230,21 +230,18 @@ void PowerPCRegisterInfo::emitEpilogue(MachineFunction &MF,
// Get the number of bytes allocated from the FrameInfo... // Get the number of bytes allocated from the FrameInfo...
unsigned NumBytes = MFI->getStackSize(); unsigned NumBytes = MFI->getStackSize();
// Read old LR from stack into R0 // Adjust stack pointer back
MI = BuildMI(PPC32::LWZ, 2, PPC32::R0).addSImm(8+NumBytes).addReg(PPC32::R1); MI = BuildMI(PPC32::LWZ, 2, PPC32::R1).addImm(0).addReg(PPC32::R1);
MBB.insert(MBBI, MI); MBB.insert(MBBI, MI);
// Adjust stack pointer back: r1 += numbytes
if (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 we have calls, restore the LR value before we branch to it
if (MFI->hasCalls()) { if (MFI->hasCalls()) {
// Read old LR from stack into R0
MI = BuildMI(PPC32::LWZ, 2, PPC32::R0).addSImm(8).addReg(PPC32::R1);
MBB.insert(MBBI, MI);
MI = BuildMI(PPC32::MTLR, 1).addReg(PPC32::R0); MI = BuildMI(PPC32::MTLR, 1).addReg(PPC32::R0);
MBB.insert(MBBI, MI); MBB.insert(MBBI, MI);
MI = BuildMI(PPC32::LWZ, 2, PPC32::R31).addSImm(-4).addReg(PPC32::R1); MI = BuildMI(PPC32::LMW, 2, PPC32::R30).addSImm(-8).addReg(PPC32::R1);
MBB.insert(MBBI, MI); MBB.insert(MBBI, MI);
} }
} }