[touisteur]

Yes, I know. For purely sequential code that's the actual use (though sometimes, golden tests are generated through matlab or python, in double precision and then every divergence becomes a game of whack a mole. And don't start me on x87-80 bits extended precision suddenly compiled to SSE, so actual ieee754... We have integrated some of the FP static and dynamic analysis tools in our CI/CD pipeline for new code but ugh...

Anyway, as time passes by I veer off equality and think about the actual necessary accuracy and wish there was a way to set it as a spec for proof (SPARK/Ada or a higher level DSL that can be lowered to proper accuracy analysis tools...

I wish I could also specify 'no NaNs please' as a postcondition. Need to check in with the SPARK team and get an introduction article going...

[mgaunard]

There are simple tools that tell you how many of your floating-point digits are just propagated rounding errors.