TargetRegisterInfo::~TargetRegisterInfo() {}
-/// getPhysicalRegisterRegClass - Returns the Register Class of a physical
-/// register of the given type. If type is EVT::Other, then just return any
-/// register class the register belongs to.
-const TargetRegisterClass *
-TargetRegisterInfo::getPhysicalRegisterRegClass(unsigned reg, EVT VT) const {
- assert(isPhysicalRegister(reg) && "reg must be a physical register");
-
- // Pick the most super register class of the right type that contains
- // this physreg.
- const TargetRegisterClass* BestRC = 0;
- for (regclass_iterator I = regclass_begin(), E = regclass_end(); I != E; ++I){
- const TargetRegisterClass* RC = *I;
- if ((VT == MVT::Other || RC->hasType(VT)) && RC->contains(reg) &&
- (!BestRC || BestRC->hasSuperClass(RC)))
- BestRC = RC;
- }
-
- assert(BestRC && "Couldn't find the register class");
- return BestRC;
-}
-
/// getMinimalPhysRegClass - Returns the Register Class of a physical
-/// register of the given type.
+/// register of the given type, picking the most sub register class of
+/// the right type that contains this physreg.
const TargetRegisterClass *
TargetRegisterInfo::getMinimalPhysRegClass(unsigned reg, EVT VT) const {
assert(isPhysicalRegister(reg) && "reg must be a physical register");
/// 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;
}