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Altera_Forum's avatar
Altera_Forum
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14 years ago

Nios II/f performance on Cyclone IV E

Hi, I am trying to evaluate Nios II/f on a dev. board fitted with EP4CE55F23C7. I've ported the Cyclone III Dhrystone example from Altera (Fast Nios II Hardware Design Example) to my board....
Altera_Forum's avatar
Altera_Forum
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12 years ago

Application makefile created by Nios2 sw build tools should contain APP_CFLAGS_OPTIMIZATION, set it to

-O2 or -O3..6. Changing BSP optimization flags can be done by passing --set hal.make.bsp_cflags_optimization -O2

to nios2-bsp. You chould check Nios2 Software Build Tools documentation for more.

On a side note you might wan't to check the newly released sourcery gcc 4.7.3. I've found it generates much better

- faster - code in some cases than the old gcc from Altera. But beware it has some serious issues with custom

floating point instructions.