'simd-transpose' does not work on arm64 architecture

[heeckhau]

cargo test --features simd-transpose

results in:

...
 Compiling matrix-transpose v0.1.0 (/Users/heeckhau/tlsnotary/mpz/matrix-transpose)
error[E0432]: unresolved import `super::LANE_COUNT`
 --> matrix-transpose/src/simd.rs:1:29
  |
1 | use super::{TransposeError, LANE_COUNT};
  |                             ^^^^^^^^^^ no `LANE_COUNT` in the root

error[E0425]: cannot find function `transpose_bits` in module `simd`
  --> matrix-transpose/src/lib.rs:55:11
   |
55 |     simd::transpose_bits(matrix, rows)?;
   |           ^^^^^^^^^^^^^^ not found in `simd`

error[E0554]: `#![feature]` may not be used on the stable release channel
 --> matrix-transpose/src/lib.rs:3:5
  |
3 |     feature(slice_split_at_unchecked),
  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error[E0554]: `#![feature]` may not be used on the stable release channel
 --> matrix-transpose/src/lib.rs:4:5
  |
4 |     feature(portable_simd),
  |     ^^^^^^^^^^^^^^^^^^^^^^

error[E0554]: `#![feature]` may not be used on the stable release channel
 --> matrix-transpose/src/lib.rs:5:5
  |
5 |     feature(stmt_expr_attributes),
  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error[E0554]: `#![feature]` may not be used on the stable release channel
 --> matrix-transpose/src/lib.rs:6:5
  |
6 |     feature(slice_as_chunks)
  |     ^^^^^^^^^^^^^^^^^^^^^^^^

warning: unused import: `TransposeError`
 --> matrix-transpose/src/simd.rs:1:13
  |
1 | use super::{TransposeError, LANE_COUNT};
  |             ^^^^^^^^^^^^^^
  |
  = note: `#[warn(unused_imports)]` on by default

warning: unused import: `ops::ShlAssign`
 --> matrix-transpose/src/simd.rs:3:5
  |
3 |     ops::ShlAssign,
  |     ^^^^^^^^^^^^^^

error[E0554]: `#![feature]` may not be used on the stable release channel
 --> matrix-transpose/src/lib.rs:3:13
  |
3 |     feature(slice_split_at_unchecked),
  |             ^^^^^^^^^^^^^^^^^^^^^^^^

error[E0554]: `#![feature]` may not be used on the stable release channel
 --> matrix-transpose/src/lib.rs:4:13
  |
4 |     feature(portable_simd),
  |             ^^^^^^^^^^^^^

error[E0554]: `#![feature]` may not be used on the stable release channel
 --> matrix-transpose/src/lib.rs:6:13
  |
6 |     feature(slice_as_chunks)
  |             ^^^^^^^^^^^^^^^

[heeckhau]

The LANE_COUNT can be rewritten as:

pub const LANE_COUNT: usize = if cfg!(all(feature = "simd-transpose", target_arch = "x86_64")) {
    32
} else if cfg!(all(feature = "simd-transpose", target_arch = "wasm32")) {
    16
} else {
    8
};

But I don't know what Arm supports or not