System information

Intel® Xeon Phi™ Coprocessor DEVELOPER’S QUICK START GUIDE

}

return ret;

}

Code Example 7: Array Reduction Using Open MP and Intel® Cilk™ Plus in C/C++

Parallel Programming on the Intel® Xeon Phi™ Coprocessor: Intel® Cilk™ Plus

Intel Cilk Plus header files are not available on the target environment by default. To make the header files

available to an application built for the Intel® MIC Architecture using Intel Cilk Plus, wrap the header files with

#pragma offload_attribute(push,target(mic)) and #pragma offload_attribute(pop) as follows:

#pragma offload_attribute(push,target(mic))

#include <cilk/cilk.h>

#include <cilk/reducer_opadd.h>

#pragma offload_attribute(pop)

Code Example 8: Wrapping the Header Files in C/C++

In the following example, the compiler converts the cilk_for loop into a recursively called function using an

efficient divide-and-conquer strategy.

float ReduceCilk(float*data, int size)

{

float ret = 0;

#pragma offload target(mic) in(data:length(size))

{

cilk::reducer_opadd<int> total;

cilk_for (int i=0; i<size; ++i)

{

total += data[i];

}

ret = total.get_value();

}

return ret;

}

Code Example 9: Creating a Recursively Called Function by Converting the “cilk_for” Loop

Parallel Programming on Intel® Xeon Phi™ Coprocessor: Intel® Threading Building Blocks

(Intel® TBB)

Like Intel Cilk Plus, the Intel TBB header files are not available on the target environment by default. They are

made available to the Intel® MIC Architecture target environment using similar techniques:

#pragma offload_attribute (push,target(mic))

#include "tbb/task_scheduler_init.h"

#include "tbb/blocked_range.h"

#include "tbb/parallel_reduce.h"

#include "tbb/task.h"

#pragma offload_attribute (pop)

using namespace tbb;