return f.Config.intParamRegs[reg]
		}
	}

	// Helper to construct a new OpArg{Float,Int}Reg op value.
	var pos src.XPos
	if len(f.Entry.Values) != 0 {
		pos = f.Entry.Values[0].Pos
	}
	synthesizeOpIntFloatArg := func(n *ir.Name, t *types.Type, reg abi.RegIndex, sl LocalSlot) *Value {
		aux := &AuxNameOffset{n, sl.Off}
		op, auxInt := ArgOpAndRegisterFor(reg, f.ABISelf)
		v := f.newValueNoBlock(op, t, pos)