Counting the position of ones in a binary vector

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I used the VHDL 1993 setting in QII 9.1SP2 that I use for waveform simulation. Actually 9.1SP2 produces a faster circuit then 10.1SP1.

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I didn't yet proceed to Quartus 10. I compiled under V9.0 with VHDL 1993 settings and got the below error with your recent code. I was under the assumption, that constant slice ranges are required, no idea which other setting may be different. But the point isn't very important.

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Error (10394): VHDL error at bitpos.vhd(29): left bound of range must be a constant

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