There's two kinds of Helium (aka M-Profile Vector Extensions) - integer only, and integer+float capable. +mve and +mve.fp. Even the integer one can turn:

```rust
pub fn sum(data1: &mut [u8; 8], data2: &[u8; 8]) {
    for idx in 0..8 {
        data1[idx] = data1[idx].wrapping_add(data2[idx]);
    }
}
```

into:

```text
00000000 <samplelib::sum>:
   0:   fd90 0e80       ldc2    14, cr0, [r0, #512]     @ 0x200
   4:   fd91 2e80       ldc2    14, cr2, [r1, #512]     @ 0x200
   8:   ef12 0840       vadd.i16        q0, q1, q0
   c:   ed80 0e80       stc     14, cr0, [r0, #512]     @ 0x200
  10:   4770            bx      lr
```