What is the difference between __restrict and restrict?

[Jayden_S_]

I check them in my code and find __restrict gives better performance than restrict when used for pointers with intel c++ compiler. I use #pragma omp parallel for and #pragma ivdep for my loop. What is the difference between __restrict and restrict?

[TimP]

restrict doesn't take effect without std=c99 or qrestrict. Not knowing your specific context, I prefer__restrict for that purpose in c++.

[Judith_W_Intel]

In the compiler itself these are synonyms. As Tim pointed out it is just a question of which version is allowed in which language dialect...

Judy