Vector Field Oriented Control (FOC) of BLDC motors was a prime application. C30’s MAC intrinsics allowed:
Diving into Microchip Development: A Guide to the MPLAB C30 Compiler mplab c30 compiler
The dsPIC family combines the features of a microcontroller with the processing power of a DSP (Digital Signal Processor). These chips include a powerful "DSP Engine" capable of single-cycle multiply-accumulate (MAC) operations, barrel shifting, and bit-reversal for FFTs. Vector Field Oriented Control (FOC) of BLDC motors