otter 1.2.1

Otter game system; main data structures Rust crate.
Documentation 
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// Copyright 2020-2021 Ian Jackson and contributors to Otter
// SPDX-License-Identifier: MIT-0 OR AGPL-3.0-or-later
// There is NO WARRANTY.

// results:
// rustc 1.46.0-nightly --release
//
// slotmap::Keydata::get_idx_version               3.259 3.185 3.220
// slotmap_slot_idx::KeyData::get_idx_version      3.724 3.750 3.665

use otter_support::slotmap_slot_idx;
use otter_support::crates::slotmap;

const BATCH: usize = 128;
const ITERS: usize = 10*1024*1024;

fn main() {
  let vol_i_buffer = [0x123456789abcdefu64; BATCH];
  let mut vol_o_buffer = [0xdeadbeef; BATCH];

  for _it in 0..ITERS {
    let input = unsafe { std::ptr::read_volatile(&vol_i_buffer) };
    let mut output = [0u32; BATCH];

    for (&i,o) in input.iter().zip(output.iter_mut()) {
      let kd = slotmap::KeyData::from_ffi(i);
      let (vsn,_) = slotmap_slot_idx::KeyDataExt::get_idx_version(kd);
      *o = vsn;
    }

    unsafe { std::ptr::write_volatile(&mut vol_o_buffer, output) };
    //eprintln!("{:x?}", vol_o_buffer[0]);
  }
}