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Hans Bezemer <the.beez.speaks@gmail.com> writes:
> 5. I added GCC extension support to 4tH in version 3.62.0. At the
> time, it improved performance by about 25%. By accident I found out
> that was no longer true. switch() based was faster. I didn't know
> there had been changes in that regard to GCC.

If you mean the goto *a feature, these days you might try using tail
calls instead.  GCC and LLVM both now support a musttail attribute that
ensures this optimization, or signals a compile-time error if it can't.

https://lwn.net/Articles/1033373/