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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14412 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Misha Brukman 2004-06-25 18:45:07 +00:00
parent 972569a22f
commit 1cbb3ee75f
1 changed files with 32 additions and 31 deletions
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63
lib/Target/PowerPC/PowerPCRegisterInfo.cpp
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@ -110,34 +110,35 @@ static bool hasFP(MachineFunction &MF) {
void PowerPCRegisterInfo::
eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator I) const {
if (hasFP(MF)) {
// If we have a frame pointer, turn the adjcallstackdown instruction into a
// 'sub r1, r1, <amt>' and the adjcallstackup instruction into 'add r1, r1, <amt>'
MachineInstr *Old = I;
int Amount = Old->getOperand(0).getImmedValue();
if (Amount != 0) {
// We need to keep the stack aligned properly. To do this, we round the
// amount of space needed for the outgoing arguments up to the next
// alignment boundary.
unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment();
Amount = (Amount+Align-1)/Align*Align;
MachineInstr *New;
if (Old->getOpcode() == PPC32::ADJCALLSTACKDOWN) {
New = BuildMI(PPC32::ADDI, 2, PPC32::R1).addReg(PPC32::R1)
.addSImm(-Amount);
} else {
assert(Old->getOpcode() == PPC32::ADJCALLSTACKUP);
New = BuildMI(PPC32::ADDI, 2, PPC32::R1).addReg(PPC32::R1)
.addSImm(Amount);
}
// Replace the pseudo instruction with a new instruction...
MBB.insert(I, New);
}
}
MBB.erase(I);
if (hasFP(MF)) {
// If we have a frame pointer, turn the adjcallstackdown instruction into a
// 'sub r1, r1, <amt>' and the adjcallstackup instruction into
// 'add r1, r1, <amt>'
MachineInstr *Old = I;
int Amount = Old->getOperand(0).getImmedValue();
if (Amount != 0) {
// We need to keep the stack aligned properly. To do this, we round the
// amount of space needed for the outgoing arguments up to the next
// alignment boundary.
unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment();
Amount = (Amount+Align-1)/Align*Align;
MachineInstr *New;
if (Old->getOpcode() == PPC32::ADJCALLSTACKDOWN) {
New = BuildMI(PPC32::ADDI, 2, PPC32::R1).addReg(PPC32::R1)
.addSImm(-Amount);
} else {
assert(Old->getOpcode() == PPC32::ADJCALLSTACKUP);
New = BuildMI(PPC32::ADDI, 2, PPC32::R1).addReg(PPC32::R1)
.addSImm(Amount);
}
// Replace the pseudo instruction with a new instruction...
MBB.insert(I, New);
}
}
MBB.erase(I);
}
void
@ -185,7 +186,7 @@ void PowerPCRegisterInfo::emitPrologue(MachineFunction &MF) const {
// Get the number of bytes to allocate from the FrameInfo
unsigned NumBytes = MFI->getStackSize();
if (MFI->hasCalls()) {
// When we have no frame pointer, we reserve argument space for call sites
// in the function immediately on entry to the current function. This
@ -223,7 +224,7 @@ void PowerPCRegisterInfo::emitEpilogue(MachineFunction &MF,
MachineBasicBlock::iterator MBBI = prior(MBB.end());
MachineInstr *MI;
assert(MBBI->getOpcode() == PPC32::BLR &&
"Can only insert epilog into returning blocks");
"Can only insert epilog into returning blocks");
// Get the number of bytes allocated from the FrameInfo...
unsigned NumBytes = MFI->getStackSize();
@ -233,7 +234,7 @@ void PowerPCRegisterInfo::emitEpilogue(MachineFunction &MF,
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);