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In the optimization guide there is a section on fixed point operation, page 14, which suggests statically masking your 32-bit integers to the desired precision. If I understood this right, the AOC would be able to disregard the extra bits during hardware generation thus will reduce the amount of logic (minimal in this case) but still a reduction. You may want to look into that and see if it helps you out any. I was curious so I ran the example listed in the guide for 17-bit precision. I had an increase in logic for the fixed point version over the straight 32-bit version and I don't think this should be the case. I wouldn't think the load/store units that access the memory wouldn't be an issue as Outku suggested in the case of the original poster. Any insight would be appreciated.
Thanks,
Rudy
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I think the example from the optimization guide is too small to show any benefits of masking. There is really nothing in the kernel other than two loads, one multiply and one store. If the datapath was bigger, I believe we will start seeing same impact.
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