本文整理汇总了C++中LiveRange::getNumValNums方法的典型用法代码示例。如果您正苦于以下问题：C++ LiveRange::getNumValNums方法的具体用法？C++ LiveRange::getNumValNums怎么用？C++ LiveRange::getNumValNums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LiveRange的用法示例。
在下文中一共展示了LiveRange::getNumValNums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: Classify
unsigned ConnectedVNInfoEqClasses::Classify(const LiveRange &LR) {
// Create initial equivalence classes.
EqClass.clear();
EqClass.grow(LR.getNumValNums());
const VNInfo *used = nullptr, *unused = nullptr;
// Determine connections.
for (const VNInfo *VNI : LR.valnos) {
// Group all unused values into one class.
if (VNI->isUnused()) {
if (unused)
EqClass.join(unused->id, VNI->id);
unused = VNI;
continue;
}
used = VNI;
if (VNI->isPHIDef()) {
const MachineBasicBlock *MBB = LIS.getMBBFromIndex(VNI->def);
assert(MBB && "Phi-def has no defining MBB");
// Connect to values live out of predecessors.
for (MachineBasicBlock::const_pred_iterator PI = MBB->pred_begin(),
PE = MBB->pred_end(); PI != PE; ++PI)
if (const VNInfo *PVNI = LR.getVNInfoBefore(LIS.getMBBEndIdx(*PI)))
EqClass.join(VNI->id, PVNI->id);
} else {
// Normal value defined by an instruction. Check for two-addr redef.
// FIXME: This could be coincidental. Should we really check for a tied
// operand constraint?
// Note that VNI->def may be a use slot for an early clobber def.
if (const VNInfo *UVNI = LR.getVNInfoBefore(VNI->def))
EqClass.join(VNI->id, UVNI->id);
}
}
// Lump all the unused values in with the last used value.
if (used && unused)
EqClass.join(used->id, unused->id);
EqClass.compress();
return EqClass.getNumClasses();
}