What is Helium

• The M-Profile Vector Extension (MVE) for the Arm Cortex-M processor series

• Extension of the Armv8.1-M architecture

• Delivers a significant performance increase for ML and DSP applications.

• Processing data with SIMD(Single-Instruction Multiple Data) methodology. e.g: adds four pairs of 32-bit values together

-Four 32-bit values(4 lanes), operations in the diagram are independent for each lane. Any overflow or carry from lane 0 does not affect lane 1.

Helium Features

• Use 128-bit vectors(regisetr).

• Reuse floating point registers.

• Provide instructions to perform vector add and multiply.

• Includes 8 vector registers.

• Includes both regular registers and vector registers.

• Includes loop prediction and lane prediction.

Intrinsics targeted for DSP instruction: e.g:

• vld2q, which loads blocks of data from memory and writes them to the destination register

• vrmlsldavhaq, for the multiplication of complex numbers.

Reference Source

• https: developer.arm.com documentation 102102 0103