https://github.com/StanfordPL/stoke-release

https://news.ycombinator.com/item?id=10924155

STOKE is a stochastic optimizer for the x86_64 instruction set. STOKE uses random search to explore the extremely high-dimensional space of all possible program transformations. Although any one random transformation is unlikely to produce a code sequence that is both correct and an improvement over the original, the repeated application of millions of transformations is sufficient to produce novel and non-obvious code sequences that have been shown to outperform the code produced by general-purpose and domain-specific compilers, and in some cases expert hand-written code.