I only have experience with their amd64 code. > What problems do they have? Nothing in particular, just not particularly amazing performance. They work fine.

I only have experience with their amd64 code. > What problems do they have? Nothing in particular, just not particularly amazing performance. They work fine. One thing they have going for them is that they typically have separate versions for every interesting architecture feature level/set, whereas e.g. bionic only has sse code. I guess I can point at my own implementations of memset and memcmp (https://github.com/moon-chilled/fancy-memset https://github.com/moon-chilled/fancy-memset https://github.com/moon-chilled/fancy-memcmp https://github.com/moon-chilled/fancy-memcmp), both of which employ novel techniques not used by glibc; but I've not yet gotten around to doing proper benchmarks on either.