hw multiplier for Cyclone

I got the tip to select a device with hw-multiblier-blocks (i.e. Cyclone-II) in the SoPC-Builder, generate the processor and prior to compile in Quartus change an option in the ???_mult_cell.vhd file - has someone done this successfully to get a working hw-multiplier for a Cyclone device?

Fast multiplication (and division) is very important for us because we use the Cyclone with Nios in a hard realtime system for high dynamic industrial motion control.

James:

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As for the divide custom instruction, Nios II/f has optional support for a built-in divide instruction

that the compiler will use if the option is enabled. This replaces the divide custom instruction for Nios II.[/b]

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Where can I find this option?

Thank you for your help

Chris