Does OpenCV runs on platforms with different int size?

asked 2018-02-08 09:22:54 -0600

Pzixel
41 ●2 ●5

updated 2018-03-05 12:36:42 -0600

I'm writing a library on top of the OpenCV and I have a question about crossplatformability.

So my question is: does OpenCV runs if int size is other than 32 bits, but 16, 64 or 128? Because if yes, I'd like to support those platforms, otherwise it would simplify my high level interfaces.

Comments

Hello? Anyone?

Pzixel ( 2018-02-12 01:27:05 -0600 )edit

@berak can I ask you to visit this question? It seens that it isn't really get enough attention. :(

Pzixel ( 2018-03-05 11:02:11 -0600 )edit

@Pzixel, a small edit will move it to the front page again ;)

(but i have no knowledge about the problem, sorry ;( )

(i can give you a vote and a hug (but that's all i can do here))

berak ( 2018-03-05 11:32:20 -0600 )edit

add a comment

answered 2018-03-05 14:17:47 -0600

mshabunin
1927 ●10 ●31

updated 2018-03-05 19:15:10 -0600

The _int_ type is assumed to be 4-bytes wide: https://github.com/opencv/opencv/blob...

I think there is no explicit check anywhere, but implicit assumption can be found in many places:

bit shifts and masks; not sure if this function will work with 64-bit int, but it will definitely broke for 16-bit.
we have generic 128-bit SIMD C++ implementation which assumes 128-bit register = 4 x int values
some algorithms use SoftFloat library with assumption int = int32_t (example)
...
the type identifier for int matrices is named CV_32S

edit flag offensive delete link

Comments

Hmm, I see a comment that says that int should be 4 bytes but I don't see any macro or something enforcing this rule (e.g. using int32_t instead of int). Can you elaborate a bit more, please?

Pzixel ( 2018-03-05 14:33:42 -0600 )edit

I've added some thoughts to the answer

mshabunin ( 2018-03-05 19:15:28 -0600 )edit

add a comment

Does OpenCV runs on platforms with different int size?

Comments

1 answer

Comments

Links

Question Tools

Stats

Related questions

Does OpenCV runs on platforms with different int size? edit

Comments

1 answer

Comments

Links

Question Tools

Stats

Related questions

Does OpenCV runs on platforms with different int size?