return k
	}
	panic("Haven't implemented this case yet, do I need to?")
}

// prAssignForArg returns the ABIParamAssignment for v, assumed to be an OpArg.
func (x *expandState) prAssignForArg(v *Value) *abi.ABIParamAssignment {
	if v.Op != OpArg {
		panic(fmt.Errorf("Wanted OpArg, instead saw %s", v.LongString()))
	}
	return ParamAssignmentForArgName(x.f, v.Aux.(*ir.Name))
}

					if f.pass.debug > stackDebug {
						fmt.Printf("stackalloc register arg %s skipping name %s\n", v, name)
					}
					continue
				}
			} else if name.N.Class == ir.PPARAM && v.Op != OpArg {
				// PPARAM's only bind to OpArg
				if f.pass.debug > stackDebug {
					fmt.Printf("stackalloc PPARAM name %s skipping non-Arg %s\n", name, v)
				}
				continue
			}

			if names[v.ID] == empty {

				// In particular, they need to come before regular OpArg operations because
				// of how regalloc places spill code (see regalloc.go:placeSpills:mustBeFirst).
				if b != f.Entry {
					f.Fatalf("%s appeared outside of entry block, b=%s", v.Op, b.String())
				}
				score[v.ID] = ScorePhi
			case v.Op == OpArg || v.Op == OpSP || v.Op == OpSB:

		}

		// The code below assumes that we have handled all the ops
		// with sym effects already. Sanity check that here.
		// Ignore Args since they can't be autos.
		if v.Op.SymEffect() != SymNone && v.Op != OpArg {
			panic("unhandled op with sym effect")
		}

		if v.Uses == 0 && v.Op != OpNilCheck && !v.Op.IsCall() && !v.Op.HasSideEffects() || len(args) == 0 {
			// We need to keep nil checks even if they have no use.