why this simple offload give Segmentation fault error

yongbei_ma_ — Sat, 01 Nov 2014 09:56:18 GMT

this simple test code is this(testclass.cpp):

#include <iostream>

class TEST{
public:
   double *A;
public:
   TEST(double * _A){A = _A;}
   void run(){
       A[1] = 0;
       // double *B = A;
       std::cout<<A[1]<<std::endl;
       #pragma offload target (mic) inout(A:length(2*3))
       {
           A[1] = 1;
       }
       std::cout<<A[1]<<std::endl;
   }
};

int main()
{

   double *A = (double*)_mm_malloc(sizeof(double)*2*3,64);
   TEST test(A);
   test.run();

}

.............................................................................................

after complile and run ,this give me this error:

[root@localhost yb]# icpc testclass.cpp

[root@localhost yb]# ./a.out

Segmentation fault (core dumped)

......................................................................

thanks.

It relates to the underlying

Kevin_D_Intel — Sat, 01 Nov 2014 10:58:15 GMT

It relates to the underlying "this" pointer. I need to check with someone more knowledgeable about the requirements for offload within the CLASS, but for now add the additional nocopy clause as shown below to create an instance of the underlying "this" pointer.

#pragma offload target (mic) nocopy(this : alloc_if(1) free_if(0)) inout(A:length(2*3))

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why this simple offload give Segmentation fault error

It relates to the underlying