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how to use dsp instructions from C

Question asked by Tom Wood on Jan 12, 2015
Latest reply on Jan 14, 2015 by xiangjun.rong

The SMMLA, SMMUL and SMMLL instructions provide exactly the mathmatical function that I need to write some IIR filter routines.  The complier does not use these naturally.  How do I get the compiler to use these instructions with out wading too far into the world of assembly code?