本文整理汇总了C++中unsigned::numFields方法的典型用法代码示例。如果您正苦于以下问题：C++ unsigned::numFields方法的具体用法？C++ unsigned::numFields怎么用？C++ unsigned::numFields使用的例子？那么恭喜您, 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unsigned的用法示例。
在下文中一共展示了unsigned::numFields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: emitSingletonDecoder
// Emits code to decode the singleton. Return true if we have matched all the
// well-known bits.
bool FilterChooser::emitSingletonDecoder(raw_ostream &o, unsigned &Indentation,
unsigned Opc) {
std::vector<unsigned> StartBits;
std::vector<unsigned> EndBits;
std::vector<uint64_t> FieldVals;
insn_t Insn;
insnWithID(Insn, Opc);
// Look for islands of undecoded bits of the singleton.
getIslands(StartBits, EndBits, FieldVals, Insn);
unsigned Size = StartBits.size();
unsigned I, NumBits;
// If we have matched all the well-known bits, just issue a return.
if (Size == 0) {
o.indent(Indentation) << "if (";
if (!emitPredicateMatch(o, Indentation, Opc))
o << "1";
o << ") {\n";
o.indent(Indentation) << " MI.setOpcode(" << Opc << ");\n";
std::vector<OperandInfo>& InsnOperands = Operands[Opc];
for (std::vector<OperandInfo>::iterator
I = InsnOperands.begin(), E = InsnOperands.end(); I != E; ++I) {
// If a custom instruction decoder was specified, use that.
if (I->numFields() == 0 && I->Decoder.size()) {
o.indent(Indentation) << " " << Emitter->GuardPrefix << I->Decoder
<< "(MI, insn, Address, Decoder)" << Emitter->GuardPostfix << "\n";
break;
}
emitBinaryParser(o, Indentation, *I);
}
o.indent(Indentation) << " return " << Emitter->ReturnOK << "; // " << nameWithID(Opc)
<< '\n';
o.indent(Indentation) << "}\n"; // Closing predicate block.
return true;
}
// Otherwise, there are more decodings to be done!
// Emit code to match the island(s) for the singleton.
o.indent(Indentation) << "// Check ";
for (I = Size; I != 0; --I) {
o << "Inst{" << EndBits[I-1] << '-' << StartBits[I-1] << "} ";
if (I > 1)
o << " && ";
else
o << "for singleton decoding...\n";
}
o.indent(Indentation) << "if (";
if (emitPredicateMatch(o, Indentation, Opc)) {
o << " &&\n";
o.indent(Indentation+4);
}
for (I = Size; I != 0; --I) {
NumBits = EndBits[I-1] - StartBits[I-1] + 1;
o << "fieldFromInstruction" << BitWidth << "(insn, "
<< StartBits[I-1] << ", " << NumBits
<< ") == " << FieldVals[I-1];
if (I > 1)
o << " && ";
else
o << ") {\n";
}
o.indent(Indentation) << " MI.setOpcode(" << Opc << ");\n";
std::vector<OperandInfo>& InsnOperands = Operands[Opc];
for (std::vector<OperandInfo>::iterator
I = InsnOperands.begin(), E = InsnOperands.end(); I != E; ++I) {
// If a custom instruction decoder was specified, use that.
if (I->numFields() == 0 && I->Decoder.size()) {
o.indent(Indentation) << " " << Emitter->GuardPrefix << I->Decoder
<< "(MI, insn, Address, Decoder)" << Emitter->GuardPostfix << "\n";
break;
}
emitBinaryParser(o, Indentation, *I);
}
o.indent(Indentation) << " return " << Emitter->ReturnOK << "; // " << nameWithID(Opc)
<< '\n';
o.indent(Indentation) << "}\n";
return false;
}