[burntsushi]

Do note that IFUNC is a convenience. You don't actually need to use IFUNCs to write target specific code that dispatches dynamically at runtime.

For example, ripgrep's dependencies dispatch dynamically at runtime by querying CPUID, but nothing uses GCC's "IFUNC" thingy. So it's likely that much more software is utilizing target specific code than not. Still, it's probably less than one would like.

(I think this is less of a response to you and more of a response to this entire thread. It seems like some folks are conflating "IFUNC" with "all forms of dynamic dispatching based on CPUID.")