MRegisterInfo::~MRegisterInfo() {}
+/// getAllocatableSetForRC - Toggle the bits that represent allocatable
+/// registers for the specific register class.
+static void getAllocatableSetForRC(MachineFunction &MF,
+ const TargetRegisterClass *RC, BitVector &R){
+ for (TargetRegisterClass::iterator I = RC->allocation_order_begin(MF),
+ E = RC->allocation_order_end(MF); I != E; ++I)
+ R.set(*I);
+}
+
BitVector MRegisterInfo::getAllocatableSet(MachineFunction &MF,
const TargetRegisterClass *RC) const {
BitVector Allocatable(NumRegs);
- for (MRegisterInfo::regclass_iterator I = regclass_begin(),
- E = regclass_end(); I != E; ++I) {
- const TargetRegisterClass *TRC = *I;
- if (RC && TRC != RC)
- continue;
- for (TargetRegisterClass::iterator I = TRC->allocation_order_begin(MF),
- E = TRC->allocation_order_end(MF); I != E; ++I)
- Allocatable.set(*I);
+ if (RC) {
+ getAllocatableSetForRC(MF, RC, Allocatable);
+ return Allocatable;
}
+
+ for (MRegisterInfo::regclass_iterator I = regclass_begin(),
+ E = regclass_end(); I != E; ++I)
+ getAllocatableSetForRC(MF, *I, Allocatable);
return Allocatable;
}