[Findecanor]

Modern programming language exception handler implementations use tables with entries describing the code at each call-site instead of having costly setjmp()/longjmp() calls. I think you could do something similar with trap-sites, but the tables would probably be larger.

BTW. The Mill architecture handles exceptions from integer code like floating point NaN: setting a meta-data flag called NaR - Not a Result. It gets carried through calculations just like NaNs do: setting every result to NaR if used as an operand... Up until it gets used as operand to an actual trapping instruction, such as a store. And of course you could also test for NaR instead of trapping.