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Another though I had is that you may want to verify your Nios code is actually using the FP hardware. I don't have any experience with this, but I have seen quite a few other posts on these forums about people having trouble with the compiler not actually using the FP hardware but using software emulation instead.
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It is very simple: software emulation of floating point will not fit to this Cyclone device's internal RAM. It is very small device and I must leave some dualport "video" RAM for LVDS data transfer.
And about optimization. I checked config, and it is -O2. Also, small C, no software floating point, no clean exit and etc. I need to strugle for each byte of RAM.
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