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Code clean up. No functionality change.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122528 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2010-12-23 23:54:17 +00:00
parent b0ad9cf935
commit e4a2dd2f1a
1 changed files with 47 additions and 48 deletions
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95
lib/Target/X86/X86RegisterInfo.cpp
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@ -492,70 +492,69 @@ void X86RegisterInfo::
eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator I) const {
const TargetFrameInfo *TFI = MF.getTarget().getFrameInfo();
bool reseveCallFrame = TFI->hasReservedCallFrame(MF);
int Opcode = I->getOpcode();
bool isDestroy = Opcode == getCallFrameDestroyOpcode();
DebugLoc DL = I->getDebugLoc();
uint64_t Amount = !reseveCallFrame ? I->getOperand(0).getImm() : 0;
uint64_t CalleeAmt = isDestroy ? I->getOperand(1).getImm() : 0;
I = MBB.erase(I);
if (!TFI->hasReservedCallFrame(MF)) {
if (!reseveCallFrame) {
// If the stack pointer can be changed after prologue, turn the
// adjcallstackup instruction into a 'sub ESP, <amt>' and the
// adjcallstackdown instruction into 'add ESP, <amt>'
// TODO: consider using push / pop instead of sub + store / add
MachineInstr *Old = I;
uint64_t Amount = Old->getOperand(0).getImm();
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.
Amount = (Amount + StackAlign - 1) / StackAlign * StackAlign;
if (Amount == 0)
return;
MachineInstr *New = 0;
if (Old->getOpcode() == getCallFrameSetupOpcode()) {
New = BuildMI(MF, Old->getDebugLoc(),
TII.get(getSUBriOpcode(Is64Bit, Amount)),
StackPtr)
.addReg(StackPtr)
.addImm(Amount);
} else {
assert(Old->getOpcode() == getCallFrameDestroyOpcode());
// 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.
Amount = (Amount + StackAlign - 1) / StackAlign * StackAlign;
// Factor out the amount the callee already popped.
uint64_t CalleeAmt = Old->getOperand(1).getImm();
Amount -= CalleeAmt;
MachineInstr *New = 0;
if (Opcode == getCallFrameSetupOpcode()) {
New = BuildMI(MF, DL, TII.get(getSUBriOpcode(Is64Bit, Amount)),
StackPtr)
.addReg(StackPtr)
.addImm(Amount);
} else {
assert(Opcode == getCallFrameDestroyOpcode());
// Factor out the amount the callee already popped.
Amount -= CalleeAmt;
if (Amount) {
unsigned Opc = getADDriOpcode(Is64Bit, Amount);
New = BuildMI(MF, Old->getDebugLoc(), TII.get(Opc), StackPtr)
.addReg(StackPtr)
.addImm(Amount);
}
}
if (New) {
// The EFLAGS implicit def is dead.
New->getOperand(3).setIsDead();
// Replace the pseudo instruction with a new instruction.
MBB.insert(I, New);
unsigned Opc = getADDriOpcode(Is64Bit, Amount);
New = BuildMI(MF, DL, TII.get(Opc), StackPtr)
.addReg(StackPtr).addImm(Amount);
}
}
} else if (I->getOpcode() == getCallFrameDestroyOpcode()) {
if (New) {
// The EFLAGS implicit def is dead.
New->getOperand(3).setIsDead();
// Replace the pseudo instruction with a new instruction.
MBB.insert(I, New);
}
return;
}
if (Opcode == getCallFrameDestroyOpcode() && CalleeAmt) {
// If we are performing frame pointer elimination and if the callee pops
// something off the stack pointer, add it back. We do this until we have
// more advanced stack pointer tracking ability.
if (uint64_t CalleeAmt = I->getOperand(1).getImm()) {
unsigned Opc = getSUBriOpcode(Is64Bit, CalleeAmt);
MachineInstr *Old = I;
MachineInstr *New =
BuildMI(MF, Old->getDebugLoc(), TII.get(Opc),
StackPtr)
.addReg(StackPtr)
.addImm(CalleeAmt);
unsigned Opc = getSUBriOpcode(Is64Bit, CalleeAmt);
MachineInstr *New = BuildMI(MF, DL, TII.get(Opc), StackPtr)
.addReg(StackPtr).addImm(CalleeAmt);
// The EFLAGS implicit def is dead.
New->getOperand(3).setIsDead();
MBB.insert(I, New);
}
// The EFLAGS implicit def is dead.
New->getOperand(3).setIsDead();
MBB.insert(I, New);
}
MBB.erase(I);
}
void