Error on Unity 2022.3.13 on Windows IL2CPP

[in0finite]

Library fails to decompress files on above platform.

The error message is: data corruption detected.

Sorry, no time right now to make reproduction steps.

0.7.4 and 0.7.2 give runtime error, 0.7.3 fails to compile.

[oleg-st]

It looks like the problem is in the MSVC compiler.
The /d2ssa-cse- option used in Unity causes incorrect code generation
https://godbolt.org/z/rfK5c6fGW

Reported here:
https://developercommunity.visualstudio.com/t/The-d2ssa-cse--option-causes-incorrect/10574272

[in0finite]

Keep in mind that error happens on other platforms aswell, for example, on WebGL. As far as I know, they don't use MSVC for compiling to WebAssembly. The conversion process is: C# => IL => IL2CPP => CPP => Emscripten => WebAssembly.

Sorry, I forgot to mention that in the initial post. I assumed the bug is in IL2CPP.

[oleg-st]

WebGL fails the test with native integer types

https://sharplab.io/#v2:EYLgxg9gTgpgtADwGwBYA0AXEUCuA7AHwAEAmARgFgAoIgZgAJT6Bhegb2vq8ZJPc+6CiZAJwAKACQAiNvjAALGGADWMACZixeHAEs8GAJQAGBMGAAzAKxIR5m0ZTAwtUQfoAed/QDs9AHx+9JbeAL5SBgDcAoJcwuLSsngKSqoaWnqGJmZWNnYiDk4uIm6ePv6BwWGR0TFxkjJyiirqmjgANhB4AObGphbWtvaOzq4eXr4BQaHhUVSCIdQLVEA=

Right answer is:
125
-3
125

WebGL reports:
18
18
125

Switching to ulong/long like last time might help here.

[in0finite]

Switching to ulong/long like last time might help here.

Nope, I tried using my fork of library with ulong/long, it doesn't work.

[oleg-st]

A workaround for the MSVC problem:

Add additionalIl2CppArgs: --compiler-flags="/d2SSAOptimizer-" to ProjectSettings.asset

[korvemaa]

I am getting a similar error on WebGL platform and using the additional CppArgs doesn't seem to fix it (can't build the project). I did the native integer types test, and it also reports wrong.

64310096
64236544
125

Any help would be great :)

[oleg-st]

The WebGL platform does not have proper debugging tools to find the root cause.
You can report a problem with a native integers in WebGL to Unity.

[oleg-st]

@Jake-NSW @in0finite
Looks like decompression works in Unity 2022.3.26f1 WebGL

[in0finite]

Thanks for letting me know.

However, in the meantime, I switched to 2023.3.0b5 and the bug is still present here.