struct RCInfo {
unsigned Tag;
unsigned NumRegs;
+ bool ProperSubClass;
OwningArrayPtr<unsigned> Order;
- RCInfo() : Tag(0), NumRegs(0) {}
+ RCInfo() : Tag(0), NumRegs(0), ProperSubClass(false) {}
operator ArrayRef<unsigned>() const {
- return ArrayRef<unsigned>(Order.get(), NumRegs);
+ return makeArrayRef(Order.get(), NumRegs);
}
};
return get(RC);
}
+ /// isProperSubClass - Returns true if RC has a legal super-class with more
+ /// allocatable registers.
+ ///
+ /// Register classes like GR32_NOSP are not proper sub-classes because %esp
+ /// is not allocatable. Similarly, tGPR is not a proper sub-class in Thumb
+ /// mode because the GPR super-class is not legal.
+ bool isProperSubClass(const TargetRegisterClass *RC) const {
+ return get(RC).ProperSubClass;
+ }
+
/// getLastCalleeSavedAlias - Returns the last callee saved register that
/// overlaps PhysReg, or 0 if Reg doesn't overlap a CSR.
unsigned getLastCalleeSavedAlias(unsigned PhysReg) const {