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Altera_Forum's avatar
Altera_Forum
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15 years ago

NIOS2 HW & DIV Instructions + FPU

Hello i am in charge of designing a system that does a lot of complex sin/cos/* instructions and i need them to be fast. I am using NIOS2-F at 100mhz in a Cyclone IV. I've enabled HW and DIV ...
Altera_Forum's avatar
Altera_Forum
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15 years ago

Since your code is working on constants I wouldn't expect the FPU to be used even if one was present since those results can be pre-computed.

The FPU is pretty big compared to the Nios II core so the FPU is not added automatically since many would be annoyed by this (especially the folks who don't need float support or who take the time to perform fixed point math).

The hardware multiple and divide options of the various Nios II cores are for integer data types, not float/double.