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  order of operation expense?  (Read 1284 times)
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Offline deepthought
« Posted 2013-02-10 18:10:58 »

In interest of optimization, ho do Java operations  ( int division, float division, new, etc.) compare to each other in terms of processing expense.

Also, what about opengl functions?
I am especially interested in useshader() vs bindtexture() vs bindbuffer() and attribute location functions.

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Offline KevinWorkman

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« Reply #1 - Posted 2013-02-11 16:57:27 »

I would expect that to probably be implementation-dependent.

But of course, the best way to test this is with a benchmark. I'd be really curious to see what you find though.

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Offline delt0r

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« Reply #2 - Posted 2013-02-11 17:20:00 »

Micro benchmarks are bad. In this case they are truly awful. At least the decent JVM's (open jdk and sun jdk) do many optimizations. So that muladd or addmul instructions etc are used where possible (for example). I belive 7 or 8 even includes some SSE stuff etc. They also will do many of the peep hole optimizations (ie use a shift instead of a * by a power of 2 for example).

On modern hardware moving the data around is typically as expensive as multiplies and adds. Cache performance is typically what matters.

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Offline deepthought
« Reply #3 - Posted 2013-02-11 22:02:14 »

how about various opengl bind or shader calls?

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Offline princec

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« Reply #4 - Posted 2013-02-11 22:18:49 »

Those are just trivial calls to drivers; the Java bit is a matter of nanoseconds.

Cas Smiley

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