[H-GEN] Which is better?

[Adrian Sutton]

On 26/04/2004, at 3:53 PM, Anthony Towns wrote:

> Consider if doCalcs() was something like (my Java's a bit rusty):
>
> 	class foo {
> 		static int i = 0;
> 		static int doCalcs(int v) {
> 			i = i + 3;
> 			return v - i;
> 		}
> 	}
>
> doCalcs(10) will return 7 on the first invocation, then 4, then 1,
> then -2, and so on.

In this case the method won't be inlined and would have to be run 
multiple times, but if it were something like:

static int doCalcs(int v) {
	return v;
}

or

static int doCalcs(int v) {
	return 5;
}

the JIT compiler would almost certainly inline it if the code was run 
enough times to warrant being compiled.  Generally the optimizations 
that the HotSpot compiler (which provides the JIT compilation for Sun 
and Sun derived JVMs) are absolutely astounding.  As most people have 
pointed out - don't try to predict it, you'll almost certainly be 
wrong.

Regards,

Adrian Sutton.
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