How do you leverage DSP capabilities in ARM Cortex-M processors?

ARM Cortex-M4/M7 DSP features: Single-cycle 32-bit MAC (multiply-accumulate), SIMD instructions (parallel 16-bit and 8-bit operations), Saturating arithmetic (no overflow wrapping), Hardware FPU (single and double precision in M7), and DSP instruction set (SMUAD, SMLAD, etc.). Optimization: Use CMSIS-DSP library (optimized implementations), Compiler intrinsics for DSP instructions, Fixed-point arithmetic for M0/M3 without FPU, and Pipeline optimization (loop unrolling, data alignment). Applications: Audio processing, sensor fusion, motor control, and filtering. M7 adds cache for higher DSP throughput. Compare MCU DSP vs dedicated DSP for performance requirements.