xref: /libCEED/tests/t201-elemrestriction.c (revision 2b730f8b5a9c809740a0b3b302db43a719c636b1)

/// @file
/// Test creation, use, and destruction of a strided element restriction
/// \test Test creation, use, and destruction of a strided element restriction
#include <ceed.h>
#include <ceed/backend.h>

int main(int argc, char **argv) {
  Ceed                ceed;
  CeedVector          x, y;
  CeedInt             num_elem = 3;
  CeedScalar          a[num_elem * 2];
  const CeedScalar   *yy;
  CeedInt             strides[3] = {1, 2, 2};
  CeedInt             layout[3];
  CeedElemRestriction r;

  CeedInit(argv[1], &ceed);

  CeedVectorCreate(ceed, num_elem * 2, &x);
  for (CeedInt i = 0; i < num_elem * 2; i++) a[i] = 10 + i;
  CeedVectorSetArray(x, CEED_MEM_HOST, CEED_USE_POINTER, a);

  CeedElemRestrictionCreateStrided(ceed, num_elem, 2, 1, num_elem * 2, strides, &r);
  CeedVectorCreate(ceed, num_elem * 2, &y);
  CeedElemRestrictionApply(r, CEED_NOTRANSPOSE, x, y, CEED_REQUEST_IMMEDIATE);

  CeedVectorGetArrayRead(y, CEED_MEM_HOST, &yy);
  CeedElemRestrictionGetELayout(r, &layout);
  for (CeedInt i = 0; i < 2; i++) {             // Node
    for (CeedInt j = 0; j < 1; j++) {           // Component
      for (CeedInt k = 0; k < num_elem; k++) {  // Element
        if (yy[i * layout[0] + j * layout[1] + k * layout[2]] != a[i * strides[0] + j * strides[1] + k * strides[2]]) {
          // LCOV_EXCL_START
          printf("Error in restricted array y[%" CeedInt_FMT "][%" CeedInt_FMT "][%" CeedInt_FMT "] = %f\n", i, j, k,
                 (CeedScalar)yy[i * strides[0] + j * strides[1] + j * strides[2]]);
          // LCOV_EXCL_STOP
        }
      }
    }
  }
  CeedVectorRestoreArrayRead(y, &yy);

  CeedVectorDestroy(&x);
  CeedVectorDestroy(&y);
  CeedElemRestrictionDestroy(&r);
  CeedDestroy(&ceed);
  return 0;
}