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Cortex-M4 DSP operations with nRF52

The ARM Cortex-M4 supports many assembly-level DSP instructions and we would like to use them (not just the packaged ones in the CMSIS DSP libraries).

For example the set of signed multiply-accumulate halfword operations (SMLABB, for example) is very useful.  

How can we use these valuable M4 assembly instructions, which require several qualifiers (references to variables in the C program)?  Is there a good example of inline C for the nRF52?

Thanks,

Jackson  

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