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Altera_Forum's avatar
Altera_Forum
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13 years ago

FP Custom Instructions - exp() won't get any faster

Hi everybody. I'm working on a design using Nios II/f that heavily relies on floating point math. In Qsys I addedd Floating Point Hardware and I connected it to the Custom Instruction Master of ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

In the BSP editor I've searched for some reference on the FP custom functions.

Under Advanced -> Hal -> Make

fpu_present

hardware_divide_present

hardware_fp_cust_inst_divider_present

hardware_fp_cust_inst_no_divider_present

hardware_multiplier_present

I tried to turn these options On and Off but with no effect.

I'm not quite following you on the symbol table. Where can I find it?

About the exp() accuracy, since I need to compute a much more complex function (a TanSig) I'll surely build a custom instruction using a LUT.

Still I'd like to be sure to have implemented the FP Hardware correctly ;)