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authorJakob Stoklund Olesen <stoklund@2pi.dk>2012-02-01 22:12:51 +0000
committerJakob Stoklund Olesen <stoklund@2pi.dk>2012-02-01 22:12:51 +0000
commitf18a9a2314542ad3b7a601b86969073519e19b0d (patch)
treebd1efa8a40d861371f76d76c6829698d77113b2d /utils
parentc2348d5c08dc9cd3f015110700e62a1ed9347c16 (diff)
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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. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149546 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'utils')
-rw-r--r--utils/TableGen/RegisterInfoEmitter.cpp17
1 files changed, 11 insertions, 6 deletions
diff --git a/utils/TableGen/RegisterInfoEmitter.cpp b/utils/TableGen/RegisterInfoEmitter.cpp
index dc17f70b5c..1399fdeee7 100644
--- a/utils/TableGen/RegisterInfoEmitter.cpp
+++ b/utils/TableGen/RegisterInfoEmitter.cpp
@@ -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";