本文整理汇总了C++中machinebasicblock::iterator::removeFromParent方法的典型用法代码示例。如果您正苦于以下问题:C++ iterator::removeFromParent方法的具体用法?C++ iterator::removeFromParent怎么用?C++ iterator::removeFromParent使用的例子?那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类machinebasicblock::iterator
的用法示例。
在下文中一共展示了iterator::removeFromParent方法的1个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: int
void Z80FrameLowering::emitEpilogue(MachineFunction &MF,
MachineBasicBlock &MBB) const {
MachineBasicBlock::iterator MI = MBB.getFirstTerminator();
DebugLoc DL = MBB.findDebugLoc(MI);
MachineFrameInfo &MFI = MF.getFrameInfo();
int StackSize = int(MFI.getStackSize());
const TargetRegisterClass *ScratchRC = Is24Bit ? &Z80::A24RegClass
: &Z80::A16RegClass;
TargetRegisterClass::iterator ScratchReg = ScratchRC->begin();
for (; MI->readsRegister(TRI->getSubReg(*ScratchReg, Z80::sub_low), TRI);
++ScratchReg)
assert(ScratchReg != ScratchRC->end() &&
"Could not allocate a scratch register!");
assert((hasFP(MF) || *ScratchReg != TRI->getFrameRegister(MF)) &&
"Cannot allocate csr as scratch register!");
// skip callee-saved restores
while (MI != MBB.begin())
if (!(--MI)->getFlag(MachineInstr::FrameDestroy)) {
++MI;
break;
}
// consume stack adjustment
while (MI != MBB.begin()) {
MachineBasicBlock::iterator PI = std::prev(MI);
unsigned Opc = PI->getOpcode();
if ((Opc == Z80::POP24r || Opc == Z80::POP16r) &&
PI->getOperand(0).isDead()) {
StackSize += SlotSize;
} else if (Opc == Z80::LD24SP || Opc == Z80::LD16SP) {
bool Is24Bit = Opc == Z80::LD24SP;
unsigned Reg = PI->getOperand(0).getReg();
if (PI == MBB.begin())
break;
MachineBasicBlock::iterator AI = std::prev(PI);
Opc = AI->getOpcode();
if (AI == MBB.begin() || Opc != (Is24Bit ? Z80::ADD24SP : Z80::ADD16SP) ||
AI->getOperand(0).getReg() != Reg ||
AI->getOperand(1).getReg() != Reg)
break;
MachineBasicBlock::iterator LI = std::prev(AI);
Opc = LI->getOpcode();
if (Opc != (Is24Bit ? Z80::LD24ri : Z80::LD16ri) ||
LI->getOperand(0).getReg() != Reg)
break;
StackSize += LI->getOperand(1).getImm();
LI->removeFromParent();
AI->removeFromParent();
} else
break;
PI->removeFromParent();
}
bool HasFP = hasFP(MF);
BuildStackAdjustment(MF, MBB, MI, DL, *ScratchReg, StackSize,
HasFP ? StackSize : -1, MFI.hasVarSizedObjects());
if (HasFP)
BuildMI(MBB, MI, DL, TII.get(Is24Bit ? Z80::POP24r : Z80::POP16r),
TRI->getFrameRegister(MF));
}