Speedup simplify

Question

Speedup simplify

apkunpacker opened this issue 5 years ago · comments

Simplify working great on simplification of classes given by -it but giving whole dex or apk taking too much time . Is there anything which can speedup simplify at default parameter set ? I would like to suggest a feature request of showing approx predicated time in completing simplification after first calculating number of classes and provided perameter value . If it is possible that would be great help . Thanks

Caleb Fenton · Answer 1 · Mon Jan 21 2019 05:13:00 GMT+0800 (China Standard Time)

Do you have any suggestions on how to accurately predict how long a class will take to analyze? My guess is that problem is itself as difficult as analyzing and simplifying the code.

There are optimizations that could be done. I've only profiled a little, and mostly around register management and item cloning. There's probably a lot of other optimizations that could be done that wouldn't require a massive rewrite of smalivm.

In general, I think the best case would be to fail more gracefully for classes which can't be optimized. You don't have to try very hard to run into the halting problem in almost every non-trivial class.

ApkUnpacker · Answer 2 · Mon Jan 21 2019 21:01:06 GMT+0800 (China Standard Time)

so only way to speedup simplification is target required class ? 1 more request last simplify build is of 2017 and we still using that because we can not build . may u build a new one with fix of all bugs appear after last build . thanks

Caleb Fenton · Answer 3 · Wed Jan 23 2019 03:27:35 GMT+0800 (China Standard Time)

so only way to speedup simplification is target required class ?

No.

1 more request last simplify build is of 2017 and we still using that because we can not build .

Build works fine on Travis, my machine, and many others. If you can't build, please create a separate issue. That said, you're right that it's probably time to update maven release.