running into an interesting situation where some basic math kotlinlang #android

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Title

v

vince

03/16/2023, 11:55 PM

running into an interesting situation where some basic math to colorize a f16 depth image to rgb is running more than 2x slower in Kotlin than in Java... is there an equivalent of the Kotlin Bytecode viewer but in Java I can use to compare?

Here's a gist of the function:

https://gist.github.com/vinc3m1/d56ff294a73ad506a5fa5ffb3e46185f

java takes 20-25ms, kotlin takes 60+

my guess is all the boxing

all the operators are calling

invoke-virtual

for

Int.plus

and

Int.times

, etc

Updated the gist with dex bytecode from java and kotlin files, you can see that the kotlin dex is full of

invoke-virtual

from basic math functions due to operator overloading... is this expected? should the compiler be able to inline or optimize that out?

hmmm looking at a release build this seems to be fixed in the kotlin bytecode, but let me confirm...

yep definitely fixed in release. I guess that's expected then? just somewhat surprising behavior. there's an easy way to enable that optimization in a debug build that'd be nice

Ah dang, this is totally a jetpack compose thing

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