What is the syntax for using the restrict keyword for a 2d array function parameter?

问题

I have an array declared in my main function: float A[n][n];

My goal is to pass it to a function with the restrict keyword: void func(int n, float restrict A[][n])

I tried the syntax above, but I am not getting the optimization in running time that I am expecting. I have also seen this syntax for 1d arrays: void func(int n, float A[restrict])

回答1:

The pointer can be restrict. All below forms are equivalent:

void func(int n, float A[restrict n][n]);
void func(int n, float A[restrict][n]);
void func(int n, float (* restrict A)[n]);

来源：https://stackoverflow.com/questions/60243068/what-is-the-syntax-for-using-the-restrict-keyword-for-a-2d-array-function-parame