Unfortunately it may be quite hard to certify that your program qualifies, specially if it's a high performance program that can't be single threaded. An innocuous-looking commit can completely undermine this property.

Doubly so if you must guarantee determinism across multiple platforms! IEEE 754-2008 helps but it defines cross-platform determinism for just a subset of operations. Compilers can also sometimes botch your FP code (there's a number of gotchas - for example, if any library anywhere in your program uses -ffast-math, it may infect the whole program https://stackoverflow.com/questions/68938175/what-happens-if...)