+ // Conservatively only handle 'returned' on non-vectors for now
+ if (Args[i].isReturned && !Op.getValueType().isVector()) {
+ assert(CLI.RetTy == Args[i].Ty && RetTys.size() == NumValues &&
+ "unexpected use of 'returned'");
+ // Before passing 'returned' to the target lowering code, ensure that
+ // either the register MVT and the actual EVT are the same size or that
+ // the return value and argument are extended in the same way; in these
+ // cases it's safe to pass the argument register value unchanged as the
+ // return register value (although it's at the target's option whether
+ // to do so)
+ // TODO: allow code generation to take advantage of partially preserved
+ // registers rather than clobbering the entire register when the
+ // parameter extension method is not compatible with the return
+ // extension method
+ if ((NumParts * PartVT.getSizeInBits() == VT.getSizeInBits()) ||
+ (ExtendKind != ISD::ANY_EXTEND &&
+ CLI.RetSExt == Args[i].isSExt && CLI.RetZExt == Args[i].isZExt))
+ Flags.setReturned();
+ }
+