Depending on your language, you may not need explicit language support. For example these guys have a runtime codegen library that they use (on Scala): https://

Depending on your language, you may not need explicit language support. For example these guys have a runtime codegen library that they use (on Scala): https://ppl.stanford.edu/papers/popl13_rompf.pdf https://ppl.stanford.edu/papers/popl13_rompf.pdf There's also a tradition of older metaprogramming approaches in data layout optimizations, eg. ATLAS BLAS.