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Avoid emitting empty arrays, they're not standard C++. 

It's only by luck that we haven't produced any yet, and clang refuses to
compile them.

llvm-svn: 149546
This commit is contained in:
Jakob Stoklund Olesen 2012-02-01 22:12:51 +00:00
parent e71ddf2fcb
commit 855662ad9a
1 changed files with 11 additions and 6 deletions
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17
llvm/utils/TableGen/RegisterInfoEmitter.cpp
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@ -640,17 +640,22 @@ RegisterInfoEmitter::runTargetDesc(raw_ostream &OS, CodeGenTarget &Target,
<< "getRawAllocationOrder(const MachineFunction &MF) const {\n";
for (unsigned oi = 1 , oe = RC.getNumOrders(); oi != oe; ++oi) {
ArrayRef<Record*> Elems = RC.getOrder(oi);
OS << " static const unsigned AltOrder" << oi << "[] = {";
for (unsigned elem = 0; elem != Elems.size(); ++elem)
OS << (elem ? ", " : " ") << getQualifiedName(Elems[elem]);
OS << " };\n";
if (!Elems.empty()) {
OS << " static const unsigned AltOrder" << oi << "[] = {";
for (unsigned elem = 0; elem != Elems.size(); ++elem)
OS << (elem ? ", " : " ") << getQualifiedName(Elems[elem]);
OS << " };\n";
}
}
OS << " const MCRegisterClass &MCR = " << Target.getName()
<< "MCRegisterClasses[" << RC.getQualifiedName() + "RegClassID];"
<< "MCRegisterClasses[" << RC.getQualifiedName() + "RegClassID];\n"
<< " static const ArrayRef<unsigned> Order[] = {\n"
<< " makeArrayRef(MCR.begin(), MCR.getNumRegs()";
for (unsigned oi = 1, oe = RC.getNumOrders(); oi != oe; ++oi)
OS << "),\n makeArrayRef(AltOrder" << oi;
if (RC.getOrder(oi).empty())
OS << "),\n ArrayRef<unsigned>(";
else
OS << "),\n makeArrayRef(AltOrder" << oi;
OS << ")\n };\n const unsigned Select = " << RC.getName()
<< "AltOrderSelect(MF);\n assert(Select < " << RC.getNumOrders()
<< ");\n return Order[Select];\n}\n";