Most mobile devices use 64-bit ARM processors. A growing number of servers (Amazon, Microsoft) also use 64-bit ARM processors.

These processors  have special instructions called ARM NEON providing parallelism called Single instruction, multiple data (SIMD). For example, you can compare sixteen values with sixteen other values using one instruction.

Some of the most recent ARM processors also support even more advanced instructions called SVE or Scalable Vector Extension. They have added more and more extensions over time: SVE 2 and SVE 2.1.

While ARM NEON’s registers are set at 128 bits, SVE registers are a multiple of 128 bits. In practice, SVE registers are most often 128 bits although there are exceptions. The Amazon Graviton 3 is based on ARM Neoverse V1 core, which supports SVE with a vector length of 256 bits (32 bytes). For the Graviton 4, it is based on the ARM Neoverse V2 core, which supports SVE2 with a vector length of 16 bytes, like NEON.