Nios2 Performance

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originally posted by anagnost@Jan 20 2005, 05:44 PM

jesse: i do not think that adding a hardware fp to nios ii and then comparing it with an arm using a software fp and a hardware barrel shifter (which by the way nios ii/f also has) would make things fair. i think that this is exactly what would make thinks unfair. i think it would be then like comparing apples to oranges to use badomen's expression.

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I am sorry if I was ambiguous; that isn't what I meant. I was suggesing that he take a quick look at objdumps (or for that matter, just find the libs and compare C code) to see what the difference in software emulation of floating point arithmetic is between the two processors. From the descriptions above it sounds awfully like a software library difference.

Now, as far as improving things on the Nios II side, there are those FP units available for download and test that have helped a number of people out in their designs -- the trade-off is whether you can afford to spend the additional FPGA LEs... I guess I was just trying to highlight the availability of those as potential solutions. Hope this makes what I was trying to convey less ambiguous.