hpc-2022-g3/OpenMP/linear-algebra/kernels/symm/symm.c

#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <math.h>

/* Include polybench common header. */
#include <polybench.h>

/* Include benchmark-specific header. */
/* Default data type is double, default size is 4000. */
#include "symm.h"

/* Array initialization. */
static void init_array(int ni, int nj,
                       DATA_TYPE *alpha,
                       DATA_TYPE *beta,
                       DATA_TYPE POLYBENCH_2D(C, NI, NJ, ni, nj),
                       DATA_TYPE POLYBENCH_2D(A, NJ, NJ, nj, nj),
                       DATA_TYPE POLYBENCH_2D(B, NI, NJ, ni, nj))
{
  int i, j;

  *alpha = 32412;
  *beta = 2123;
  for (i = 0; i < ni; i++)
    for (j = 0; j < nj; j++)
    {
      C[i][j] = ((DATA_TYPE)i * j) / ni;
      B[i][j] = ((DATA_TYPE)i * j) / ni;
    }
  for (i = 0; i < nj; i++)
    for (j = 0; j < nj; j++)
      A[i][j] = ((DATA_TYPE)i * j) / ni;
}

/* DCE code. Must scan the entire live-out data.
   Can be used also to check the correctness of the output. */
static void print_array(int ni, int nj,
                        DATA_TYPE POLYBENCH_2D(C, NI, NJ, ni, nj))
{
  int i, j;

  for (i = 0; i < ni; i++)
    for (j = 0; j < nj; j++)
    {
      fprintf(stderr, DATA_PRINTF_MODIFIER, C[i][j]);
      if ((i * ni + j) % 20 == 0)
        fprintf(stderr, "\n");
    }
  fprintf(stderr, "\n");
}

/* Main computational kernel. The whole function will be timed,
   including the call and return. */
static void kernel_symm(int ni, int nj,
                        DATA_TYPE alpha,
                        DATA_TYPE beta,
                        DATA_TYPE POLYBENCH_2D(C, NI, NJ, ni, nj),
                        DATA_TYPE POLYBENCH_2D(A, NJ, NJ, nj, nj),
                        DATA_TYPE POLYBENCH_2D(B, NI, NJ, ni, nj))
{
  int i, j, k;
  DATA_TYPE acc;
#pragma scop
#pragma omp parallel
  {
/*  C := alpha*A*B + beta*C, A is symetric */
#pragma omp for private(j, acc, k)
    for (i = 0; i < _PB_NI; i++)
      for (j = 0; j < _PB_NJ; j++)
      {
        acc = 0;
        for (k = 0; k < j - 1; k++)
        {
          C[k][j] += alpha * A[k][i] * B[i][j];
          acc += B[k][j] * A[k][i];
        }
        C[i][j] = beta * C[i][j] + alpha * A[i][i] * B[i][j] + alpha * acc;
      }
  }
#pragma endscop
}

int main(int argc, char **argv)
{
  /* Retrieve problem size. */
  int ni = NI;
  int nj = NJ;

  /* Variable declaration/allocation. */
  DATA_TYPE alpha;
  DATA_TYPE beta;
  POLYBENCH_2D_ARRAY_DECL(C, DATA_TYPE, NI, NJ, ni, nj);
  POLYBENCH_2D_ARRAY_DECL(A, DATA_TYPE, NJ, NJ, nj, nj);
  POLYBENCH_2D_ARRAY_DECL(B, DATA_TYPE, NI, NJ, ni, nj);

  /* Initialize array(s). */
  init_array(ni, nj, &alpha, &beta,
             POLYBENCH_ARRAY(C),
             POLYBENCH_ARRAY(A),
             POLYBENCH_ARRAY(B));

  /* Start timer. */
  polybench_start_instruments;

  /* Run kernel. */
  kernel_symm(ni, nj,
              alpha, beta,
              POLYBENCH_ARRAY(C),
              POLYBENCH_ARRAY(A),
              POLYBENCH_ARRAY(B));

  /* Stop and print timer. */
  polybench_stop_instruments;
  polybench_print_instruments;

  /* Prevent dead-code elimination. All live-out data must be printed
     by the function call in argument. */
  polybench_prevent_dce(print_array(ni, nj, POLYBENCH_ARRAY(C)));

  /* Be clean. */
  POLYBENCH_FREE_ARRAY(C);
  POLYBENCH_FREE_ARRAY(A);
  POLYBENCH_FREE_ARRAY(B);

  return 0;
}