SIMD (universal intrinsics) support?

[fzyzcjy]

Hi thanks for this lib! I wonder how we can have support for SIMD, i.e. universal intrinsics? Because this can boost the speed by, say, 4x!

[twistedfall]

Hi, are you referring to the particular (missing) APIs that are present in the C++ OpenCV? If so, can you please name them? Because otherwise I believe SIMD support depends on how the OpenCV itself is built.

[fzyzcjy]

@twistedfall Hi I mean this: https://docs.opencv.org/4.5.3/df/d91/group__core__hal__intrin.html

[twistedfall]

I see, I’ll see if those can be exported

[fzyzcjy]

Well after 3 days poking around the source code of this lib, I feel it may not be very possible. If I understand correctly, this binding will add try-catch on every call from rust to C++. However, intrinsics are very low-level and will be called with very high frequency indeed. So exporting it will make it not useful anymore...

[twistedfall]

You can mark functions as infallible, then the try/catch will be skipped. But I understand the performance implications, I’ll keep that in mind.

[twistedfall]

This is actionable, so let's leave this open

[fzyzcjy]

Ok