[aleden]

IFunc relocations are how glibc dynamically chooses the best memcpy routine to use at runtime based on the CPU.

see https://github.com/bminor/glibc/blob/glibc-2.31/sysdeps/x86_...

[Findecanor]

Here's a article that describes how to use function multi-versioning and indirect functions (ifunc) with GCC and GNU tools:

https://lwn.net/Articles/691932/