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Chain tool speed

roscop13

Hello I'v just ordered a NRF51-DK kit.

I'm looking at the different tool chain. In my application speed is critical 16Mhz is actually bearly enough, so my question is:

-Is there a difference in the execution speed of the same code written : Keil , eclipse GCC, or Mbed?

-I see that the NRF51-DK is actually running at 32Mhz, is this ok to put a 32 Mhz Cristal to a nRF51822??

Thanks

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    This is also an interesting read regarding optimization. The modulo operator is something embedded engineers fear like the plague, but it's actually efficient on the ARM platform: embeddedgurus.com/.../

    When it comes to speed, it's as Nguyen says, it's the code that the developer writes that has the most impact.

    Doing shift-operations are always efficient compared to doing division/multiplication. I've seen many funky macro functions for effective divisions, which are purely made with regards to speed, and to be accurate enough for the scope it's used in.

    Here's a fantastic snippet from Quake 3 src sqrt calculation: en.wikipedia.org/.../Fast_inverse_square_root

    Cheers, Håkon

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    This is also an interesting read regarding optimization. The modulo operator is something embedded engineers fear like the plague, but it's actually efficient on the ARM platform: embeddedgurus.com/.../

    When it comes to speed, it's as Nguyen says, it's the code that the developer writes that has the most impact.

    Doing shift-operations are always efficient compared to doing division/multiplication. I've seen many funky macro functions for effective divisions, which are purely made with regards to speed, and to be accurate enough for the scope it's used in.

    Here's a fantastic snippet from Quake 3 src sqrt calculation: en.wikipedia.org/.../Fast_inverse_square_root

    Cheers, Håkon

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