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Tag: jit

Is JVM or JIT able to reduce duplicate method calls?

I have a function that checks if a map has some value for key (map.get(key) != null) and then returns the value, or else create new value. I’m wondering is there any JVM or JIT magic that doesn’t have to do 2 map lookups when the value exists for the given key? According to my benchmark, it seems …

Why is Java faster when using a JIT vs. compiling to machine code?

I have heard that Java must use a JIT to be fast. This makes perfect sense when comparing to interpretation, but why can’t someone make an ahead-of-time compiler that generates fast Java code? I know about gcj, but I don’t think its output is typically faster than Hotspot for example. Are there th…