- const std::vector<CodeGenRegisterClass> &RC = getRegisterClasses();
- for (unsigned i = 0, e = RC.size(); i != e; ++i)
- if (RC[i].TheDef == R)
- return RC[i];
- assert(0 && "Didn't find the register class");
- abort();
- }
-
- /// 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 superset-subset relationship and the same set of
- /// types, return the superclass. Otherwise return null.
- const CodeGenRegisterClass *getRegisterClassForRegister(Record *R) const {
- const std::vector<CodeGenRegisterClass> &RCs = getRegisterClasses();
- const CodeGenRegisterClass *FoundRC = 0;
- for (unsigned i = 0, e = RCs.size(); i != e; ++i) {
- const CodeGenRegisterClass &RC = RegisterClasses[i];
- for (unsigned ei = 0, ee = RC.Elements.size(); ei != ee; ++ei) {
- if (R != RC.Elements[ei])
- continue;
-
- // If a register's classes have different types, return null.
- if (FoundRC && RC.getValueTypes() != FoundRC->getValueTypes())
- return 0;
-
- // If this is the first class that contains the register,
- // make a note of it and go on to the next class.
- if (!FoundRC) {
- FoundRC = &RC;
- break;
- }
-
- std::vector<Record *> Elements(RC.Elements);
- std::vector<Record *> FoundElements(FoundRC->Elements);
- std::sort(Elements.begin(), Elements.end());
- std::sort(FoundElements.begin(), FoundElements.end());
-
- // Check to see if the previously found class that contains
- // the register is a subclass of the current class. If so,
- // prefer the superclass.
- if (std::includes(Elements.begin(), Elements.end(),
- FoundElements.begin(), FoundElements.end())) {
- FoundRC = &RC;
- break;
- }
-
- // Check to see if the previously found class that contains
- // the register is a superclass of the current class. If so,
- // prefer the superclass.
- if (std::includes(FoundElements.begin(), FoundElements.end(),
- Elements.begin(), Elements.end()))
- break;
-
- // Multiple classes, and neither is a superclass of the other.
- // Return null.
- return 0;
- }
- }
- return FoundRC;