Error: passing 'int ' to parameter of type ' int ' changes address space of pointer

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when compiling the bellow <device code="">. the following error showed up:

error: passing 'int *' to parameter of type ' int *' changes address space of pointer
            array_dist[i] = Euclidean_distance(X_train, mydatapoint);
note: passing argument to parameter 'array_point_B' here
 float Euclidean_distance(__global int* restrict array_point_A, __global int* restrict array_point_B) {

my code:

inline float Euclidean_distance(__global int* restrict array_point_A, __global int* restrict array_point_B) {
 // do something
}
_kernel void KNN_classifier(__global int* restrict X_train, __global int* restrict Y_train, __global int* restrict data_point, __global int* restrict array_X_set, __global int* restrict index_arr, __global float* restrict array_dist)
{
    int mydatapoint[20];
    for (int l = 0; l + 8 < 4344; l += 8) {
        for (int u = l; u < l + 8; ++u) {
            for (int j = 0; j < 20; ++j) {
                mydatapoint[j] = array_X_set[u];

            }

            for (int i = 0; i < 4344; i++) {
                array_dist[i] = Euclidean_distance(X_train, mydatapoint);//ask
                index_arr[i] = i;
            }

What I have tried:

I am not sure what this error mean and why it happened. I need to fix it

Posted 17-Oct-21 2:39am

prother123

Updated 17-Oct-21 2:54am

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Richard MacCutchan · Answer 1 · 2021-10-17T02:54:00

Solution 1

I am not an OpenCL expert but looking at your code I suspect it is because you are passing a local address to a function that expects a global:

C++

// your function definition
inline float Euclidean_distance(__global int* restrict array_point_A, __global int* restrict array_point_B) {
 // do something
 // NB both inputs are declared as __global int* restrict
}

However, in your call to this function you have:

C++

                array_dist[i] = Euclidean_distance(X_train, mydatapoint);
// mydatapoint is a local int array, which may well be the issue.

Posted 17-Oct-21 2:54am

Richard MacCutchan

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prother123 17-Oct-21 9:00am

Thank you for your reply. So what do you suggest as solution

Richard MacCutchan 17-Oct-21 9:08am

Like I said, I am not an OpenCL expert. You need to go to the OpenCL documentation to find out how to fix this. But I suspect you somehow need to allocate mydatapoint as a global array so it matches the declaration of Euclidean_distance, or change the function definition to accept a local array for the second parameter.

Error: passing 'int ' to parameter of type ' int ' changes address space of pointer

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Error: passing 'int *' to parameter of type ' int *' changes address space of pointer

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Error: passing 'int ' to parameter of type ' int ' changes address space of pointer