+ llvm_unreachable(nullptr);
+ }
+ HaveRegParm = Locs.back().isRegLoc();
+ }
+
+ // Copy all the registers from the value locations we added.
+ assert(NumLocs < Locs.size() && "CC assignment failed to add location");
+ for (unsigned I = NumLocs, E = Locs.size(); I != E; ++I)
+ if (Locs[I].isRegLoc())
+ Regs.push_back(MCPhysReg(Locs[I].getLocReg()));
+
+ // Clear the assigned values and stack memory. We leave the registers marked
+ // as allocated so that future queries don't return the same registers, i.e.
+ // when i64 and f64 are both passed in GPRs.
+ StackOffset = SavedStackOffset;
+ MaxStackArgAlign = SavedMaxStackArgAlign;
+ Locs.resize(NumLocs);
+}
+
+void CCState::analyzeMustTailForwardedRegisters(
+ SmallVectorImpl<ForwardedRegister> &Forwards, ArrayRef<MVT> RegParmTypes,
+ CCAssignFn Fn) {
+ // Oftentimes calling conventions will not user register parameters for
+ // variadic functions, so we need to assume we're not variadic so that we get
+ // all the registers that might be used in a non-variadic call.
+ SaveAndRestore<bool> SavedVarArg(IsVarArg, false);
+
+ for (MVT RegVT : RegParmTypes) {
+ SmallVector<MCPhysReg, 8> RemainingRegs;
+ getRemainingRegParmsForType(RemainingRegs, RegVT, Fn);
+ const TargetLowering *TL = MF.getSubtarget().getTargetLowering();
+ const TargetRegisterClass *RC = TL->getRegClassFor(RegVT);
+ for (MCPhysReg PReg : RemainingRegs) {
+ unsigned VReg = MF.addLiveIn(PReg, RC);
+ Forwards.push_back(ForwardedRegister(VReg, PReg, RegVT));
+ }