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Compute a preferred spill register class for each callee-save register 

llvm-svn: 23553
This commit is contained in:
Chris Lattner 2005-09-30 06:44:45 +00:00
parent 4984e99b83
commit da6fcc9f49
1 changed files with 24 additions and 1 deletions
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25
llvm/utils/TableGen/RegisterInfoEmitter.cpp
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@ -59,6 +59,7 @@ void RegisterInfoEmitter::runHeader(std::ostream &OS) {
<< " " << ClassName
<< "(int CallFrameSetupOpcode = -1, int CallFrameDestroyOpcode = -1);\n"
<< " const unsigned* getCalleeSaveRegs() const;\n"
<< "const TargetRegisterClass* const *getCalleeSaveRegClasses() const;\n"
<< "};\n\n";
const std::vector<CodeGenRegisterClass> &RegisterClasses =
@ -244,7 +245,7 @@ void RegisterInfoEmitter::run(std::ostream &OS) {
<< ", RegisterClasses, RegisterClasses+" << RegisterClasses.size() <<",\n "
<< " CallFrameSetupOpcode, CallFrameDestroyOpcode) {}\n\n";
// Emit the getCalleeSaveRegs method...
// Emit the getCalleeSaveRegs method.
OS << "const unsigned* " << ClassName << "::getCalleeSaveRegs() const {\n"
<< " static const unsigned CalleeSaveRegs[] = {\n ";
@ -252,5 +253,27 @@ void RegisterInfoEmitter::run(std::ostream &OS) {
for (unsigned i = 0, e = CSR.size(); i != e; ++i)
OS << getQualifiedName(CSR[i]) << ", ";
OS << " 0\n };\n return CalleeSaveRegs;\n}\n\n";
// Emit information about the callee saved register classes.
OS << "const TargetRegisterClass* const*\n" << ClassName
<< "::getCalleeSaveRegClasses() const {\n"
<< " static const TargetRegisterClass * const "
<< "CalleeSaveRegClasses[] = {\n ";
for (unsigned i = 0, e = CSR.size(); i != e; ++i) {
Record *R = CSR[i];
std::multimap<Record*, const CodeGenRegisterClass*>::iterator I, E;
tie(I, E) = RegClassesBelongedTo.equal_range(R);
if (I == E)
throw "Callee saved register '" + R->getName() +
"' must belong to a register class for spilling.\n";
const CodeGenRegisterClass *RC = (I++)->second;
for (; I != E; ++I)
if (RC->SpillSize < I->second->SpillSize)
RC = I->second;
OS << "&" << getQualifiedName(RC->TheDef) << "RegClass, ";
}
OS << " 0\n };\n return CalleeSaveRegClasses;\n}\n\n";
OS << "} // End llvm namespace \n";
}