本文整理汇总了C++中SystemZMachineFunctionInfo::setCalleeSavedFrameSize方法的典型用法代码示例。如果您正苦于以下问题：C++ SystemZMachineFunctionInfo::setCalleeSavedFrameSize方法的具体用法？C++ SystemZMachineFunctionInfo::setCalleeSavedFrameSize怎么用？C++ SystemZMachineFunctionInfo::setCalleeSavedFrameSize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SystemZMachineFunctionInfo的用法示例。
在下文中一共展示了SystemZMachineFunctionInfo::setCalleeSavedFrameSize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: BuildMI
bool
SystemZInstrInfo::spillCalleeSavedRegisters(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
const std::vector<CalleeSavedInfo> &CSI) const {
if (CSI.empty())
return false;
DebugLoc DL = DebugLoc::getUnknownLoc();
if (MI != MBB.end()) DL = MI->getDebugLoc();
MachineFunction &MF = *MBB.getParent();
SystemZMachineFunctionInfo *MFI = MF.getInfo<SystemZMachineFunctionInfo>();
unsigned CalleeFrameSize = 0;
// Scan the callee-saved and find the bounds of register spill area.
unsigned LowReg = 0, HighReg = 0, StartOffset = -1U, EndOffset = 0;
for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
unsigned Reg = CSI[i].getReg();
const TargetRegisterClass *RegClass = CSI[i].getRegClass();
if (RegClass != &SystemZ::FP64RegClass) {
unsigned Offset = RegSpillOffsets[Reg];
CalleeFrameSize += 8;
if (StartOffset > Offset) {
LowReg = Reg; StartOffset = Offset;
}
if (EndOffset < Offset) {
HighReg = Reg; EndOffset = RegSpillOffsets[Reg];
}
}
}
// Save information for epilogue inserter.
MFI->setCalleeSavedFrameSize(CalleeFrameSize);
MFI->setLowReg(LowReg); MFI->setHighReg(HighReg);
// Save GPRs
if (StartOffset) {
// Build a store instruction. Use STORE MULTIPLE instruction if there are many
// registers to store, otherwise - just STORE.
MachineInstrBuilder MIB =
BuildMI(MBB, MI, DL, get((LowReg == HighReg ?
SystemZ::MOV64mr : SystemZ::MOV64mrm)));
// Add store operands.
MIB.addReg(SystemZ::R15D).addImm(StartOffset);
if (LowReg == HighReg)
MIB.addReg(0);
MIB.addReg(LowReg, RegState::Kill);
if (LowReg != HighReg)
MIB.addReg(HighReg, RegState::Kill);
// Do a second scan adding regs as being killed by instruction
for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
unsigned Reg = CSI[i].getReg();
// Add the callee-saved register as live-in. It's killed at the spill.
MBB.addLiveIn(Reg);
if (Reg != LowReg && Reg != HighReg)
MIB.addReg(Reg, RegState::ImplicitKill);
}
}
// Save FPRs
for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
unsigned Reg = CSI[i].getReg();
const TargetRegisterClass *RegClass = CSI[i].getRegClass();
if (RegClass == &SystemZ::FP64RegClass) {
MBB.addLiveIn(Reg);
storeRegToStackSlot(MBB, MI, Reg, true, CSI[i].getFrameIdx(), RegClass);
}
}
return true;
}