Also for SIMD-enabled functions it is not allowed to have side effects except writes by their ...

[mikeitexpert]

Hi Everybody,

I am new to vector programming and I am studying here and there just to better understand the details ...

There is a statement which isn't clear to me enough saying ... "Also for SIMD-enabled functions it is not allowed to have side effects except writes by their arguments. This rule can be violated by non-vector function calls, so be careful executing such calls in SIMD-enabled functions."

What does the above mean by "side effects except writes by their arguments. "?

I would appreciate any comments / elaboration.

Regards

https://software.intel.com/content/www/us/en/develop/documentation/cpp-compiler-developer-guide-and-reference/top/optimization-and-programming-guide/vectorization/explicit-vector-programming/user-mandated-or-simd-vectorization.html

[RahulV_intel · Accepted solution]

Hi,

Side-effect basically means that that a  SIMD-enabled function cannot change any state outside of the function. (Like modifying a variable outside its local environment is not permitted)

Thanks,

Rahul

[RahulV_intel]

Hi,

Thanks for accepting the solution. Intel will no longer monitor this thread. Further discussions on this thread will be considered community only.

Regards,

Rahul