return CalleeSaved[N-1];
return 0;
}
+
+ /// isReserved - Returns true when PhysReg is a reserved register.
+ ///
+ /// Reserved registers may belong to an allocatable register class, but the
+ /// target has explicitly requested that they are not used.
+ ///
+ bool isReserved(unsigned PhysReg) const {
+ return Reserved.test(PhysReg);
+ }
+
+ /// isAllocatable - Returns true when PhysReg belongs to an allocatable
+ /// register class and it hasn't been reserved.
+ ///
+ /// Allocatable registers may show up in the allocation order of some virtual
+ /// register, so a register allocator needs to track its liveness and
+ /// availability.
+ bool isAllocatable(unsigned PhysReg) const {
+ return TRI->isInAllocatableClass(PhysReg) && !isReserved(PhysReg);
+ }
};
} // end namespace llvm