Get some problem with global variable declaration

哲_陈_ — Thu, 09 Apr 2015 13:58:16 GMT

I try use an Intel PHI co-prococessor.But i got some problem with global variable declaration .I decline A,B,C as global variable.But the value of them are equal。Turn out to be，A=5，B=5，C=5.And AA=30.The right AA must be 17.Try to get some help here.Thanks.

#include <stdio.h>
#include <math.h>
#include <omp.h>
#pragma offload_attribute(push,target(mic))
float *A;
float *B;
float *C;
#pragma offload_attribute(pop)

//__attribute__((target(mic))) float *A,*B,*C;

void noco (float *A,float *B,float *C,int j)
{
int i;
#pragma offload target (mic)\
nocopy(A:length(j) alloc_if(1) free_if(0))\
nocopy(B:length(j) alloc_if(1) free_if(0))\
nocopy(C:length(j) alloc_if(1) free_if(0))
for(i=0;i<j;i++)
{
  A=2;
  B=3;
  C=5;
}
}

void add (float *A,float *B,float *C,float *AA,int j)
{
int i;
#pragma offload target (mic)\
nocopy(A:length(j) alloc_if(0) free_if(1))\
nocopy(B:length(j) alloc_if(0) free_if(1))\
nocopy(C:length(j) alloc_if(0) free_if(1))\
out(AA:length(j) alloc_if(1) free_if(1))
for(i=0;i<j;i++)
{
AA=A+B*C;
}

}
int main()
{
float *AA =NULL;
float j=11;
AA = (float *) malloc(j*sizeof(float));
noco(A,B,C,j);
add(A,B,C,AA,j);
printf("%f",AA[1]);
return 0;
}

There is a specific moderated

TimP — Fri, 24 Apr 2015 15:21:29 GMT

There is a specific moderated forum for MIC, while you have no guarantee that the right people will see your questions on this apparently un-moderated forum.

topic Get some problem with global variable declaration in Intel® Moderncode for Parallel Architectures

Get some problem with global variable declaration

There is a specific moderated