[gnutls-devel] GnuTLS | slow performance on IBM POWER architecture (#853)

[Development of GNU's TLS library]

Nikos Mavrogiannopoulos commented:


Currently we use [cryptogams implementation](https://github.com/dot-asm/cryptogams) from openssl for assembly optimizations for x86, x86-64 and aarch64. It would be _relatively_ easy to bring another implementation for it, however setting up the (CI) testing environment may be more tricky. If someone would like to try:
 - The gnutls assembler files are placed in `lib/accelerated/ARCH/[elf]`; a new architecture is registered in `lib/accelerated/accelerated.c`.
 - They require a thin layer "linking" nettle with assembly; that is in `lib/accelerated/ARCH/.
 - The assembler files themselves are auto-generated using rules in `cfg.mk`; you can do that using `make asm-sources`
 - The testing of non-x86 architectures is done via qemu; images are created in https://gitlab.com/gnutls/build-images/tree/master/docker-debian-cross and `.gitlab-ci.yml` in main repo has individual tests

It using the aarch64 as base it should not be too hard to bring power architecture as well.

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