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Loop unrolling on Cortex-M3 vs. Cortex-M0

Indu Girish

In the DSP lib files like arm_conv_f32, arm_fir_f32, the algorithm implementation in Cortex-M3/M4 and in Cortex-M0 is different. i.e., loop unrolling is used in M3/M4 and it is not used in M0.

Pls tell me the reason behind it. Is there any advantage of using loop unrolling in M3/M4.

Thanks

Indu

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  • 0 in reply to daith

    daith wrote:

    The main advantage of loop unrolling is to schedule the memory accesses better.

    Yes this is true; I didn't think about that, because the question was about Cortex-M0, where scheduling of LDR instructions won't matter.

    Still, it's possible to merge memory access on the Cortex-M0, which in some cases can change the task from being impossible to being possible.

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  • 0 in reply to daith

    daith wrote:

    The main advantage of loop unrolling is to schedule the memory accesses better.

    Yes this is true; I didn't think about that, because the question was about Cortex-M0, where scheduling of LDR instructions won't matter.

    Still, it's possible to merge memory access on the Cortex-M0, which in some cases can change the task from being impossible to being possible.

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