❯ /lib/ld-linux-x86-64.so.2 --help | grep x86
Usage: /lib/ld-linux-x86-64.so.2 [OPTION]... EXECUTABLE-FILE [ARGS-FOR-PROGRAM...]
This program interpreter self-identifies as: /usr/lib/ld-linux-x86-64.so.2
x86-64-v4
x86-64-v3 (supported, searched)
x86-64-v2 (supported, searched)not all x86-64-v* libs or apps will improve performance. But for a proper app (ex: ffmpeg) speed can be 10%-20% more. The SUSE approach is to have branches for specific basic libs (ex: libz) so the loader will auto-chose at run-time the proper version for your CPU. But hey, they have a lot of resources (servers, people, time) to keep/update their x86-64-v2 and normal x86 etc.
The big problem will start if/when main software (ex: firefox, mesa) will be be only x86-64-v3/4 from upstream developers.For common users a degrade speed of 10% will not be initially noticed (slowly boil the frog) then CPU firmware (updates with clear intention of obsolete), lower kernel speed (to avoid spectre / meltdown), increased bloated software (see rust language). In the end users will be forced to upgrade the hardware. I guesstimate in 5-10 years no 486 CPU will run and will not be manufactured.