- /// getCalleeSaveRegs - Return a null-terminated list of all of the
- /// callee-save registers on this target.
- virtual const unsigned* getCalleeSaveRegs() const = 0;
+ /// regsOverlap - Returns true if the two registers are equal or alias
+ /// each other. The registers may be virtual register.
+ bool regsOverlap(unsigned regA, unsigned regB) const {
+ if (regA == regB)
+ return true;
+
+ if (isVirtualRegister(regA) || isVirtualRegister(regB))
+ return false;
+ return areAliases(regA, regB);
+ }
+
+ /// isSubRegister - Returns true if regB is a sub-register of regA.
+ ///
+ bool isSubRegister(unsigned regA, unsigned regB) const {
+ for (const unsigned *SR = getSubRegisters(regA); *SR; ++SR)
+ if (*SR == regB) return true;
+ return false;
+ }
+
+ /// isSuperRegister - Returns true if regB is a super-register of regA.
+ ///
+ bool isSuperRegister(unsigned regA, unsigned regB) const {
+ for (const unsigned *SR = getSuperRegisters(regA); *SR; ++SR)
+ if (*SR == regB) return true;
+ return false;
+ }
+
+ /// getCalleeSavedRegs - Return a null-terminated list of all of the
+ /// callee saved registers on this target. The register should be in the
+ /// order of desired callee-save stack frame offset. The first register is
+ /// closed to the incoming stack pointer if stack grows down, and vice versa.
+ virtual const unsigned* getCalleeSavedRegs() const = 0;