Modelsim and altfp blocks

I'm instantiating the altfp_div block in VHDL directly without using the megawizard:

LIBRARY altera_mf; 
USE altera_mf.altera_mf_components.all;
...
div0: altfp_div
    GENERIC MAP
    (
	WIDTH_EXP => FP_WIDTH_EXP,
	WIDTH_MAN => FP_WIDTH_MAN,
	ROUNDING => "TO_NEAREST",
	REDUCED_FUNCTIONALITY => "YES",
	PIPELINE => FP_DIV_PIPELINE,
	EXCEPTION_HANDLING => "NO",
	OPTIMIZE => FP_DIV_OPTIMIZATION
    )
    PORT MAP
    (
        clock => clk,
        clk_en => calc_en,
        aclr => clr,
        
        dataa => inputs.if,
        datab => inputs.rf,
        
        result => rfDivRes
    );
...

This works fine in Quartus II 9.1. The component declaration for altfp_div is in the altera_mf_components package file (comes with Quartus). I generally use this style of coding so that I can easily change any of the parameters for the div block from parameters from the parent.