/// isReserved - Returns true if a register is reserved. It is never "unused".
bool isReserved(unsigned Reg) const { return MRI->isReserved(Reg); }
- /// isUsed / isUnused - Test if a register is currently being used.
+ /// isUsed - Test if a register is currently being used. When called by the
+ /// isAliasUsed function, we only check isReserved if this is the original
+ /// register, not an alias register.
///
- bool isUsed(unsigned Reg) const {
- return !RegsAvailable.test(Reg) || isReserved(Reg);
+ bool isUsed(unsigned Reg, bool CheckReserved = true) const {
+ return !RegsAvailable.test(Reg) || (CheckReserved && isReserved(Reg));
}
/// isAliasUsed - Is Reg or an alias currently in use?