Usage Examples for CNR Support Functions

The following examples illustrate usage of support functions for conditional numerical reproducibility.

Setting Automatically Detected CNR Branch

#include <mkl.h>
int main(void) {
   int my_cbwr_branch;
   /* Find the available MKL_CBWR_BRANCH automatically */
   my_cbwr_branch = mkl_cbwr_get_auto_branch();
   /* User code without Intel MKL calls */
   /* Piece of the code where CNR of Intel MKL is needed */
   /* The performance of Intel MKL functions might be reduced for CNR mode */
   if (mkl_cbwr_set(my_cbwr_branch)!=MKL_CBWR_SUCCESS) {
      printf("Error in setting MKL_CBWR_BRANCH! Aborting…\n");
      return;
   }
   /* CNR calls to Intel MKL + any other code */
}

Use of the mkl_cbwr_get Function

#include <mkl.h>
int main(void) {
   int my_cbwr_branch;
   /* Piece of the code where CNR of Intel MKL is analyzed */
   my_cbwr_branch = mkl_cbwr_get(MKL_CBWR_BRANCH);
   switch (my_cbwr_branch) {
      case MKL_CBWR_AUTO:
	      	/* actions in case of automatic mode */
      		break;
      case MKL_CBWR_SSSE3:
      		/* actions for SSSE3 code */
      		break;
     	default:
	      	/* all other cases */
   }
   /* User code */
}

Product and Performance Information
Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex. Notice revision #20201201

Product and Performance Information

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.

Notice revision #20201201