-/// getFrameIndexOffset - Returns the displacement from the frame register to
-/// the stack frame of the specified index. This is the default implementation
-/// which is likely incorrect for the target.
-int TargetRegisterInfo::getFrameIndexOffset(MachineFunction &MF, int FI) const {
- const TargetFrameInfo &TFI = *MF.getTarget().getFrameInfo();
- MachineFrameInfo *MFI = MF.getFrameInfo();
- return MFI->getObjectOffset(FI) + MFI->getStackSize() -
- TFI.getOffsetOfLocalArea() + MFI->getOffsetAdjustment();
-}
+const TargetRegisterClass *
+llvm::getCommonSubClass(const TargetRegisterClass *A,
+ const TargetRegisterClass *B) {
+ // First take care of the trivial cases
+ if (A == B)
+ return A;
+ if (!A || !B)
+ return 0;
+
+ // If B is a subclass of A, it will be handled in the loop below
+ if (B->hasSubClass(A))
+ return A;
+
+ const TargetRegisterClass *Best = 0;
+ for (TargetRegisterClass::sc_iterator I = A->subclasses_begin();
+ const TargetRegisterClass *X = *I; ++I) {
+ if (X == B)
+ return B; // B is a subclass of A
+
+ // X must be a common subclass of A and B
+ if (!B->hasSubClass(X))
+ continue;
+
+ // A superclass is definitely better.
+ if (!Best || Best->hasSuperClass(X)) {
+ Best = X;
+ continue;
+ }