AltOrderSelect = R->getValueAsCode("AltOrderSelect");
}
+// Create an inferred register class that was missing from the .td files.
+// Most properties will be inherited from the closest super-class after the
+// class structure has been computed.
+CodeGenRegisterClass::CodeGenRegisterClass(StringRef Name, Key Props)
+ : Members(*Props.Members),
+ TheDef(0),
+ Name(Name),
+ EnumValue(-1),
+ SpillSize(Props.SpillSize),
+ SpillAlignment(Props.SpillAlignment),
+ CopyCost(0),
+ Allocatable(true) {
+}
+
+// Compute inherited propertied for a synthesized register class.
+void CodeGenRegisterClass::inheritProperties(CodeGenRegBank &RegBank) {
+ assert(!getDef() && "Only synthesized classes can inherit properties");
+ assert(!SuperClasses.empty() && "Synthesized class without super class");
+
+ // The last super-class is the smallest one.
+ CodeGenRegisterClass &Super = *SuperClasses.back();
+
+ // Most properties are copied directly.
+ // Exceptions are members, size, and alignment
+ Namespace = Super.Namespace;
+ VTs = Super.VTs;
+ CopyCost = Super.CopyCost;
+ Allocatable = Super.Allocatable;
+ AltOrderSelect = Super.AltOrderSelect;
+
+ // Copy all allocation orders, filter out foreign registers from the larger
+ // super-class.
+ Orders.resize(Super.Orders.size());
+ for (unsigned i = 0, ie = Super.Orders.size(); i != ie; ++i)
+ for (unsigned j = 0, je = Super.Orders[i].size(); j != je; ++j)
+ if (contains(RegBank.getReg(Super.Orders[i][j])))
+ Orders[i].push_back(Super.Orders[i][j]);
+}
+
bool CodeGenRegisterClass::contains(const CodeGenRegister *Reg) const {
return Members.count(Reg);
}
+namespace llvm {
+ raw_ostream &operator<<(raw_ostream &OS, const CodeGenRegisterClass::Key &K) {
+ OS << "{ S=" << K.SpillSize << ", A=" << K.SpillAlignment;
+ for (CodeGenRegister::Set::const_iterator I = K.Members->begin(),
+ E = K.Members->end(); I != E; ++I)
+ OS << ", " << (*I)->getName();
+ return OS << " }";
+ }
+}
+
+// This is a simple lexicographical order that can be used to search for sets.
+// It is not the same as the topological order provided by TopoOrderRC.
+bool CodeGenRegisterClass::Key::
+operator<(const CodeGenRegisterClass::Key &B) const {
+ assert(Members && B.Members);
+ if (*Members != *B.Members)
+ return *Members < *B.Members;
+ if (SpillSize != B.SpillSize)
+ return SpillSize < B.SpillSize;
+ return SpillAlignment < B.SpillAlignment;
+}
+
// Returns true if RC is a strict subclass.
// RC is a sub-class of this class if it is a valid replacement for any
// instruction operand where a register of this classis required. It must
if (A == B)
return 0;
- // Order by descending set size.
- if (A->getOrder().size() > B->getOrder().size())
+ // Order by descending set size. Note that the classes' allocation order may
+ // not have been computed yet. The Members set is always vaild.
+ if (A->getMembers().size() > B->getMembers().size())
return -1;
- if (A->getOrder().size() < B->getOrder().size())
+ if (A->getMembers().size() < B->getMembers().size())
return 1;
// Order by ascending spill size.
// Compute sub-classes of all register classes.
// Assume the classes are ordered topologically.
-void CodeGenRegisterClass::
-computeSubClasses(ArrayRef<CodeGenRegisterClass*> RegClasses) {
+void CodeGenRegisterClass::computeSubClasses(CodeGenRegBank &RegBank) {
+ ArrayRef<CodeGenRegisterClass*> RegClasses = RegBank.getRegClasses();
+
// Visit backwards so sub-classes are seen first.
for (unsigned rci = RegClasses.size(); rci; --rci) {
CodeGenRegisterClass &RC = *RegClasses[rci - 1];
RegClasses[s]->SuperClasses.push_back(RegClasses[rci]);
}
}
+
+ // With the class hierarchy in place, let synthesized register classes inherit
+ // properties from their closest super-class. The iteration order here can
+ // propagate properties down multiple levels.
+ for (unsigned rci = 0; rci != RegClasses.size(); ++rci)
+ if (!RegClasses[rci]->getDef())
+ RegClasses[rci]->inheritProperties(RegBank);
}
//===----------------------------------------------------------------------===//
getReg((*TupRegs)[j]);
}
+ // Precompute all sub-register maps now all the registers are known.
+ // This will create Composite entries for all inferred sub-register indices.
+ for (unsigned i = 0, e = Registers.size(); i != e; ++i)
+ Registers[i]->getSubRegs(*this);
+
// Read in register class definitions.
std::vector<Record*> RCs = Records.getAllDerivedDefinitions("RegisterClass");
if (RCs.empty())
throw std::string("No 'RegisterClass' subclasses defined!");
+ // Allocate user-defined register classes.
RegClasses.reserve(RCs.size());
- for (unsigned i = 0, e = RCs.size(); i != e; ++i) {
- CodeGenRegisterClass *RC = new CodeGenRegisterClass(*this, RCs[i]);
- RegClasses.push_back(RC);
- Def2RC[RCs[i]] = RC;
- }
+ for (unsigned i = 0, e = RCs.size(); i != e; ++i)
+ addToMaps(new CodeGenRegisterClass(*this, RCs[i]));
+
+ // Infer missing classes to create a full algebra.
+ computeInferredRegisterClasses();
+
// Order register classes topologically and assign enum values.
array_pod_sort(RegClasses.begin(), RegClasses.end(), TopoOrderRC);
for (unsigned i = 0, e = RegClasses.size(); i != e; ++i)
RegClasses[i]->EnumValue = i;
- CodeGenRegisterClass::computeSubClasses(RegClasses);
+ CodeGenRegisterClass::computeSubClasses(*this);
}
CodeGenRegister *CodeGenRegBank::getReg(Record *Def) {
return Reg;
}
+void CodeGenRegBank::addToMaps(CodeGenRegisterClass *RC) {
+ RegClasses.push_back(RC);
+
+ if (Record *Def = RC->getDef())
+ Def2RC.insert(std::make_pair(Def, RC));
+
+ // Duplicate classes are rejected by insert().
+ // That's OK, we only care about the properties handled by CGRC::Key.
+ CodeGenRegisterClass::Key K(*RC);
+ Key2RC.insert(std::make_pair(K, RC));
+}
+
CodeGenRegisterClass *CodeGenRegBank::getRegClass(Record *Def) {
if (CodeGenRegisterClass *RC = Def2RC[Def])
return RC;
}
void CodeGenRegBank::computeComposites() {
- // Precompute all sub-register maps. This will create Composite entries for
- // all inferred sub-register indices.
- for (unsigned i = 0, e = Registers.size(); i != e; ++i)
- Registers[i]->getSubRegs(*this);
-
for (unsigned i = 0, e = Registers.size(); i != e; ++i) {
CodeGenRegister *Reg1 = Registers[i];
const CodeGenRegister::SubRegMap &SRM1 = Reg1->getSubRegs();
computeComposites();
}
+// Infer missing register classes.
+//
+// For every register class RC, make sure that the set of registers in RC with
+// a given SubIxx sub-register form a register class.
+void CodeGenRegBank::computeInferredRegisterClasses() {
+ // When this function is called, the register classes have not been sorted
+ // and assigned EnumValues yet. That means getSubClasses(),
+ // getSuperClasses(), and hasSubClass() functions are defunct.
+
+ // Map SubRegIndex to register set.
+ typedef std::map<Record*, CodeGenRegister::Set, LessRecord> SubReg2SetMap;
+
+ // Visit all register classes, including the ones being added by the loop.
+ for (unsigned rci = 0; rci != RegClasses.size(); ++rci) {
+ CodeGenRegisterClass &RC = *RegClasses[rci];
+
+ // Compute the set of registers supporting each SubRegIndex.
+ SubReg2SetMap SRSets;
+ for (CodeGenRegister::Set::const_iterator RI = RC.getMembers().begin(),
+ RE = RC.getMembers().end(); RI != RE; ++RI) {
+ const CodeGenRegister::SubRegMap &SRM = (*RI)->getSubRegs();
+ for (CodeGenRegister::SubRegMap::const_iterator I = SRM.begin(),
+ E = SRM.end(); I != E; ++I)
+ SRSets[I->first].insert(*RI);
+ }
+
+ // Find matching classes for all SRSets entries. Iterate in SubRegIndex
+ // numerical order to visit synthetic indices last.
+ for (unsigned sri = 0, sre = SubRegIndices.size(); sri != sre; ++sri) {
+ Record *SubIdx = SubRegIndices[sri];
+ SubReg2SetMap::const_iterator I = SRSets.find(SubIdx);
+ // Unsupported SubRegIndex. Skip it.
+ if (I == SRSets.end())
+ continue;
+ // In most cases, all RC registers support the SubRegIndex.
+ if (I->second.size() == RC.getMembers().size()) {
+ RC.setSubClassWithSubReg(SubIdx, &RC);
+ continue;
+ }
+
+ // This is a real subset. See if we have a matching class.
+ CodeGenRegisterClass::Key K(&I->second, RC.SpillSize, RC.SpillAlignment);
+ RCKeyMap::const_iterator FoundI = Key2RC.find(K);
+ if (FoundI != Key2RC.end()) {
+ RC.setSubClassWithSubReg(SubIdx, FoundI->second);
+ continue;
+ }
+
+ // Class doesn't exist.
+ CodeGenRegisterClass *NewRC =
+ new CodeGenRegisterClass(RC.getName() + "_with_" +
+ I->first->getName(), K);
+ addToMaps(NewRC);
+ RC.setSubClassWithSubReg(SubIdx, NewRC);
+ }
+ }
+}
+
/// getRegisterClassForRegister - Find the register class that contains the
/// specified physical register. If the register is not in a register class,
/// return null. If the register is in multiple classes, and the classes have a
projects / oota-llvm.git / blobdiff