News for hackers. Stuff that matters.

A comment on A Deep Introduction to JIT Compilers: JITs are not very Just-in-time. Parent comment

Re:A Deep Introduction to JIT Compilers: JITs are not very J... by kipply on Sunday July 05, 2020 @04:43PM (#23741789)
JITs vs static compilers on a language made for static compilers is probably a contest that JITs will never win. The keys to making JITs "better" than static compilation is (by my limited knowledge) creation of languages that are made to be JIT compiled (like Java) and ensuring that tuning JITs is easier than PGO (though nothing that is currently in development seems promising to this end)
[ Parent | on HN ]
Re:A Deep Introduction to JIT Compilers: JITs are not very J... by munificent on Sunday July 05, 2020 @09:51PM (#23743929)
This is exactly right.

You do see JITs winning in Java because Java's "everything is virtual" and "most for loop are interface calls to Iterator<T>" makes it very hard to statically compile efficiently.

Languages designed for static compilation generally consider virtual dispatch to have a user-visible cost and don't unilaterally make users paying it without them asking for it.

[ Parent | on HN ]