/// getAllocatableSetForRC - Toggle the bits that represent allocatable
/// registers for the specific register class.
static void getAllocatableSetForRC(const MachineFunction &MF,
- const TargetRegisterClass *RC, BitVector &R){
+ 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 Allocatable(NumRegs);
if (RC) {
getAllocatableSetForRC(MF, RC, Allocatable);
- return Allocatable;
+ } else {
+ for (TargetRegisterInfo::regclass_iterator I = regclass_begin(),
+ E = regclass_end(); I != E; ++I)
+ getAllocatableSetForRC(MF, *I, Allocatable);
}
- for (TargetRegisterInfo::regclass_iterator I = regclass_begin(),
- E = regclass_end(); I != E; ++I)
- getAllocatableSetForRC(MF, *I, Allocatable);
+ // Mask out the reserved registers
+ BitVector Reserved = getReservedRegs(MF);
+ Allocatable &= Reserved.flip();
+
return Allocatable;
}