notes

TODO:
  - STRATEGY
  - RUN-TIME PERFORMANCE
    - Verify that correct asm instructions are being used
      - http://llvm.org/docs/LangRef.html#inline-assembler-expressions
      - Looking at assembly:
        http://huonw.github.io/blog/2015/08/simd-in-rust/
        $ rustc -L ../rust-minimax/target/debug/ --crate-type=lib -g -o board src/board.rs
        $ objdump -d board
    - Do some profiling
    - Cut down on unnecessary copying of memory (use copy instead of clone? measure the effect)
    - Use smaller types instead of u64?
    - https://github.com/huonw/llvmint
      - has a simd instruction for 8 cttz at once!
      - http://huonw.github.io/llvmint/llvmint/fn.cttz_v8i16.html
  - CODE CLEAN UP
    - add init board with random rocks
    -

SIMD crate
[dependencies.simd]
git = "https://github.com/huonw/simd"