本文整理汇总了C++中machineinstr::mop_iterator::getRegMask方法的典型用法代码示例。如果您正苦于以下问题：C++ mop_iterator::getRegMask方法的具体用法？C++ mop_iterator::getRegMask怎么用？C++ mop_iterator::getRegMask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machineinstr::mop_iterator的用法示例。
在下文中一共展示了mop_iterator::getRegMask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: regMaskOverlaps
std::auto_ptr<PBQPRAProblem> PBQPBuilder::build(MachineFunction *mf,
const LiveIntervals *lis,
const MachineLoopInfo *loopInfo,
const RegSet &vregs) {
typedef std::vector<const LiveInterval*> LIVector;
ArrayRef<SlotIndex> regMaskSlots = lis->getRegMaskSlots();
MachineRegisterInfo *mri = &mf->getRegInfo();
const TargetRegisterInfo *tri = mf->getTarget().getRegisterInfo();
std::auto_ptr<PBQPRAProblem> p(new PBQPRAProblem());
PBQP::Graph &g = p->getGraph();
RegSet pregs;
// Collect the set of preg intervals, record that they're used in the MF.
for (LiveIntervals::const_iterator itr = lis->begin(), end = lis->end();
itr != end; ++itr) {
if (TargetRegisterInfo::isPhysicalRegister(itr->first)) {
pregs.insert(itr->first);
mri->setPhysRegUsed(itr->first);
}
}
BitVector reservedRegs = tri->getReservedRegs(*mf);
// Iterate over vregs.
for (RegSet::const_iterator vregItr = vregs.begin(), vregEnd = vregs.end();
vregItr != vregEnd; ++vregItr) {
unsigned vreg = *vregItr;
const TargetRegisterClass *trc = mri->getRegClass(vreg);
const LiveInterval *vregLI = &lis->getInterval(vreg);
// Compute an initial allowed set for the current vreg.
typedef std::vector<unsigned> VRAllowed;
VRAllowed vrAllowed;
ArrayRef<uint16_t> rawOrder = trc->getRawAllocationOrder(*mf);
for (unsigned i = 0; i != rawOrder.size(); ++i) {
unsigned preg = rawOrder[i];
if (!reservedRegs.test(preg)) {
vrAllowed.push_back(preg);
}
}
RegSet overlappingPRegs;
// Record physical registers whose ranges overlap.
for (RegSet::const_iterator pregItr = pregs.begin(),
pregEnd = pregs.end();
pregItr != pregEnd; ++pregItr) {
unsigned preg = *pregItr;
const LiveInterval *pregLI = &lis->getInterval(preg);
if (pregLI->empty()) {
continue;
}
if (vregLI->overlaps(*pregLI))
overlappingPRegs.insert(preg);
}
// Record any overlaps with regmask operands.
BitVector regMaskOverlaps(tri->getNumRegs());
for (ArrayRef<SlotIndex>::iterator rmItr = regMaskSlots.begin(),
rmEnd = regMaskSlots.end();
rmItr != rmEnd; ++rmItr) {
SlotIndex rmIdx = *rmItr;
if (vregLI->liveAt(rmIdx)) {
MachineInstr *rmMI = lis->getInstructionFromIndex(rmIdx);
const uint32_t* regMask = 0;
for (MachineInstr::mop_iterator mopItr = rmMI->operands_begin(),
mopEnd = rmMI->operands_end();
mopItr != mopEnd; ++mopItr) {
if (mopItr->isRegMask()) {
regMask = mopItr->getRegMask();
break;
}
}
assert(regMask != 0 && "Couldn't find register mask.");
regMaskOverlaps.setBitsNotInMask(regMask);
}
}
for (unsigned preg = 0; preg < tri->getNumRegs(); ++preg) {
if (regMaskOverlaps.test(preg))
overlappingPRegs.insert(preg);
}
for (RegSet::const_iterator pregItr = overlappingPRegs.begin(),
pregEnd = overlappingPRegs.end();
pregItr != pregEnd; ++pregItr) {
unsigned preg = *pregItr;
// Remove the register from the allowed set.
VRAllowed::iterator eraseItr =
std::find(vrAllowed.begin(), vrAllowed.end(), preg);
if (eraseItr != vrAllowed.end()) {
vrAllowed.erase(eraseItr);
}
//.........这里部分代码省略.........