C interface for generalized eigenproblem

Added C interface for generalized eigen problem
Extended the functionality of test.c to check generalized eigenproblem,
both with and without already decomposed matrix

elpa/elpa_generic.h

@@ -61,6 +61,34 @@
         )(handle, a, ev, q, error)
 
 
+/*! \brief generic C method for elpa_generalized_eigenvectors
+ *
+ *  \details
+ *  \param  handle  handle of the ELPA object, which defines the problem
+ *  \param  a       float/double float complex/double complex pointer to matrix a
+ *  \param  b       float/double float complex/double complex pointer to matrix b
+ *  \param  ev      on return: float/double pointer to eigenvalues
+ *  \param  q       on return: float/double float complex/double complex pointer to eigenvectors
+ *  \param  is_already_decomposed   set to 1, if b already decomposed by previous call to elpa_generalized
+ *  \param  sc_desc      scalapack descriptor
+ *  \param  error   on return the error code, which can be queried with elpa_strerr()
+ *  \result void
+ */
+#define elpa_generalized_eigenvectors(handle, a, b, ev, q, sc_desc, is_already_decomposed, error) _Generic((a), \
+                double*: \
+                  elpa_generalized_eigenvectors_d, \
+                \
+                float*: \
+                  elpa_generalized_eigenvectors_f, \
+                \
+                double complex*: \
+                  elpa_generalized_eigenvectors_dc, \
+                \
+                float complex*: \
+                  elpa_generalized_eigenvectors_fc \
+        )(handle, a, b, ev, q, sc_desc, is_already_decomposed, error)
+
+
 /*! \brief generic C method for elpa_eigenvalues
  *
  *  \details

src/elpa_impl.F90

@@ -1569,14 +1569,17 @@ module elpa_impl
       endif
     end subroutine
 
-    !c> void elpa_generalized_eigenvectors_d(elpa_t handle, double *a, double *ev, double *q, int *error);
-    subroutine elpa_generalized_eigenvectors_d_c(handle, a_p, b_p, ev_p, q_p, sc_desc_p, error) &
+    !c> void elpa_generalized_eigenvectors_d(elpa_t handle, double *a, double *b, double *ev, double *q,
+    !c> int sc_desc[9], int is_already_decomposed, int *error);
+    subroutine elpa_generalized_eigenvectors_d_c(handle, a_p, b_p, ev_p, q_p, sc_desc_p, is_already_decomposed, error) &
                                                             bind(C, name="elpa_generalized_eigenvectors_d")
       type(c_ptr), intent(in), value :: handle, a_p, b_p, ev_p, q_p, sc_desc_p
+      integer(kind=c_int), intent(in), value :: is_already_decomposed
       integer(kind=c_int), optional, intent(in) :: error
 
       real(kind=c_double), pointer :: a(:, :), b(:, :), q(:, :), ev(:)
       integer(kind=c_int), pointer             :: sc_desc(:)
+      logical :: is_already_decomposed_fortran
       type(elpa_impl_t), pointer  :: self
 
       call c_f_pointer(handle, self)
@@ -1585,8 +1588,13 @@ module elpa_impl
       call c_f_pointer(ev_p, ev, [self%na])
       call c_f_pointer(q_p, q, [self%local_nrows, self%local_ncols])
       call c_f_pointer(sc_desc_p, sc_desc, [SC_DESC_LEN])
+      if(is_already_decomposed .eq. 0) then
+        is_already_decomposed_fortran = .false.
+      else
+        is_already_decomposed_fortran = .true.
+      end if
 
-      call elpa_generalized_eigenvectors_d(self, a, b, ev, q, sc_desc, .false., error)
+      call elpa_generalized_eigenvectors_d(self, a, b, ev, q, sc_desc, is_already_decomposed_fortran, error)
     end subroutine
 
 
@@ -1678,14 +1686,17 @@ module elpa_impl
     end subroutine
 
 
-    !c> void elpa_generalized_eigenvectors_f(elpa_t handle, float *a, float *ev, float *q, int *error);
-    subroutine elpa_generalized_eigenvectors_f_c(handle, a_p, b_p, ev_p, q_p, sc_desc_p, error) &
+    !c> void elpa_generalized_eigenvectors_f(elpa_t handle, float *a, float *b, float *ev, float *q, 
+    !c> int sc_desc[9], int is_already_decomposed, int *error);
+    subroutine elpa_generalized_eigenvectors_f_c(handle, a_p, b_p, ev_p, q_p, sc_desc_p, is_already_decomposed, error) &
                                                             bind(C, name="elpa_generalized_eigenvectors_f")
       type(c_ptr), intent(in), value :: handle, a_p, b_p, ev_p, q_p, sc_desc_p
+      integer(kind=c_int), intent(in), value :: is_already_decomposed
       integer(kind=c_int), optional, intent(in) :: error
 
       real(kind=c_float), pointer :: a(:, :), b(:, :), q(:, :), ev(:)
       integer(kind=c_int), pointer            :: sc_desc(:)
+      logical :: is_already_decomposed_fortran
       type(elpa_impl_t), pointer  :: self
 
       call c_f_pointer(handle, self)
@@ -1694,8 +1705,13 @@ module elpa_impl
       call c_f_pointer(ev_p, ev, [self%na])
       call c_f_pointer(q_p, q, [self%local_nrows, self%local_ncols])
       call c_f_pointer(sc_desc_p, sc_desc, [SC_DESC_LEN])
+      if(is_already_decomposed .eq. 0) then
+        is_already_decomposed_fortran = .false.
+      else
+        is_already_decomposed_fortran = .true.
+      end if
 
-      call elpa_generalized_eigenvectors_f(self, a, b, ev, q, sc_desc, .false., error)
+      call elpa_generalized_eigenvectors_f(self, a, b, ev, q, sc_desc, is_already_decomposed_fortran, error)
     end subroutine
 
 
@@ -1783,15 +1799,18 @@ module elpa_impl
     end subroutine
 
 
-    !c> void elpa_generalized_eigenvectors_dc(elpa_t handle, double complex *a, double *ev, double complex *q, int *error);
-    subroutine elpa_generalized_eigenvectors_dc_c(handle, a_p, b_p, ev_p, q_p, sc_desc_p, error) &
+    !c> void elpa_generalized_eigenvectors_dc(elpa_t handle, double complex *a, double complex *b, double *ev, double complex *q,
+    !c>                                       int sc_desc[9], int is_already_decomposed, int *error);
+    subroutine elpa_generalized_eigenvectors_dc_c(handle, a_p, b_p, ev_p, q_p, sc_desc_p, is_already_decomposed, error) &
                                                              bind(C, name="elpa_generalized_eigenvectors_dc")
       type(c_ptr), intent(in), value :: handle, a_p, b_p, ev_p, q_p, sc_desc_p
+      integer(kind=c_int), intent(in), value :: is_already_decomposed
       integer(kind=c_int), optional, intent(in) :: error
 
       complex(kind=c_double_complex), pointer :: a(:, :), b(:, :), q(:, :)
       real(kind=c_double), pointer :: ev(:)
       integer(kind=c_int), pointer             :: sc_desc(:)
+      logical :: is_already_decomposed_fortran
       type(elpa_impl_t), pointer  :: self
 
       call c_f_pointer(handle, self)
@@ -1800,8 +1819,13 @@ module elpa_impl
       call c_f_pointer(ev_p, ev, [self%na])
       call c_f_pointer(q_p, q, [self%local_nrows, self%local_ncols])
       call c_f_pointer(sc_desc_p, sc_desc, [SC_DESC_LEN])
+      if(is_already_decomposed .eq. 0) then
+        is_already_decomposed_fortran = .false.
+      else
+        is_already_decomposed_fortran = .true.
+      end if
 
-      call elpa_generalized_eigenvectors_dc(self, a, b, ev, q, sc_desc, .false., error)
+      call elpa_generalized_eigenvectors_dc(self, a, b, ev, q, sc_desc, is_already_decomposed_fortran, error)
     end subroutine
 
 
@@ -1894,15 +1918,18 @@ module elpa_impl
     end subroutine
 
 
-    !c> void elpa_generalized_eigenvectors_fc(elpa_t handle, float complex *a, float *ev, float complex *q, int *error);
-    subroutine elpa_generalized_eigenvectors_fc_c(handle, a_p, b_p, ev_p, q_p, sc_desc_p, error) &
+    !c> void elpa_generalized_eigenvectors_fc(elpa_t handle, float complex *a, float complex *b, float *ev, float complex *q,
+    !c> int sc_desc[9], int is_already_decomposed, int *error);
+    subroutine elpa_generalized_eigenvectors_fc_c(handle, a_p, b_p, ev_p, q_p, sc_desc_p, is_already_decomposed, error) &
                                                              bind(C, name="elpa_generalized_eigenvectors_fc")
       type(c_ptr), intent(in), value :: handle, a_p, b_p, ev_p, q_p, sc_desc_p
+      integer(kind=c_int), intent(in), value :: is_already_decomposed
       integer(kind=c_int), optional, intent(in) :: error
 
       complex(kind=c_float_complex), pointer :: a(:, :), b(:, :), q(:, :)
       real(kind=c_float), pointer :: ev(:)
       integer(kind=c_int), pointer            :: sc_desc(:)
+      logical :: is_already_decomposed_fortran
       type(elpa_impl_t), pointer  :: self
 
       call c_f_pointer(handle, self)
@@ -1911,8 +1938,13 @@ module elpa_impl
       call c_f_pointer(ev_p, ev, [self%na])
       call c_f_pointer(q_p, q, [self%local_nrows, self%local_ncols])
       call c_f_pointer(sc_desc_p, sc_desc, [SC_DESC_LEN])
+      if(is_already_decomposed .eq. 0) then
+        is_already_decomposed_fortran = .false.
+      else
+        is_already_decomposed_fortran = .true.
+      end if
 
-      call elpa_generalized_eigenvectors_fc(self, a, b, ev, q, sc_desc, .false., error)
+      call elpa_generalized_eigenvectors_fc(self, a, b, ev, q, sc_desc, is_already_decomposed_fortran, error)
     end subroutine
 
 #endif

test/C/driver/legacy_interface/legacy_complex_driver_c_version.c

@@ -274,7 +274,8 @@ int main(int argc, char** argv) {
    }
 
    /* check the results */
-   status = check_correctness_evp_numeric_residuals_complex_double_f(na, nev, na_rows, na_cols, as, z, ev, sc_desc, myid);
+   status = check_correctness_evp_numeric_residuals_complex_double_f(na, nev, na_rows, na_cols, as, z, ev,
+                                   sc_desc, nblk, myid, np_rows, np_cols, my_prow, my_pcol);
 
    if (status !=0){
      printf("The computed EVs are not correct !\n");

test/C/driver/legacy_interface/legacy_real_driver_c_version.c

@@ -278,7 +278,8 @@ int main(int argc, char** argv) {
 
 
    /* check the results */
-   status = check_correctness_evp_numeric_residuals_real_double_f(na, nev, na_rows, na_cols, as, z, ev, sc_desc, myid);
+   status = check_correctness_evp_numeric_residuals_real_double_f(na, nev, na_rows, na_cols, as, z, ev,
+                                   sc_desc, nblk, myid, np_rows, np_cols, my_prow, my_pcol);
 
    if (status !=0){
      printf("The computed EVs are not correct !\n");

test/C/driver/legacy_interface/legacy_single_complex_driver_c_version.c

@@ -274,7 +274,8 @@ int main(int argc, char** argv) {
    }
 
    /* check the results */
-   status = check_correctness_evp_numeric_residuals_complex_single_f(na, nev, na_rows, na_cols, as, z, ev, sc_desc, myid);
+   status = check_correctness_evp_numeric_residuals_complex_single_f(na, nev, na_rows, na_cols, as, z, ev,
+                                   sc_desc, nblk, myid, np_rows, np_cols, my_prow, my_pcol);
 
    if (status !=0){
      printf("The computed EVs are not correct !\n");

test/C/driver/legacy_interface/legacy_single_real_driver_c_version.c

@@ -277,7 +277,8 @@ int main(int argc, char** argv) {
    }
 
    /* check the results */
-   status = check_correctness_evp_numeric_residuals_real_single_f(na, nev, na_rows, na_cols, as, z, ev, sc_desc, myid);
+   status = check_correctness_evp_numeric_residuals_real_single_f(na, nev, na_rows, na_cols, as, z, ev,
+                                   sc_desc, nblk, myid, np_rows, np_cols, my_prow, my_pcol);
 
    if (status !=0){
      printf("The computed EVs are not correct !\n");

test/C/elpa1/legacy_interface/legacy_complex_1stage_c_version.c

@@ -241,9 +241,11 @@ int main(int argc, char** argv) {
 
    /* check the results */
 #ifdef DOUBLE_PRECISION_COMPLEX
-   status = check_correctness_evp_numeric_residuals_complex_double_f(na, nev, na_rows, na_cols, as, z, ev, sc_desc, myid);
+   status = check_correctness_evp_numeric_residuals_complex_double_f(na, nev, na_rows, na_cols, as, z, ev,
+                                   sc_desc, nblk, myid, np_rows, np_cols, my_prow, my_pcol);
 #else
-   status = check_correctness_evp_numeric_residuals_complex_single_f(na, nev, na_rows, na_cols, as, z, ev, sc_desc, myid);
+   status = check_correctness_evp_numeric_residuals_complex_single_f(na, nev, na_rows, na_cols, as, z, ev,
+                                   sc_desc, nblk, myid, np_rows, np_cols, my_prow, my_pcol);
 #endif
 
    if (status !=0){

test/C/elpa1/legacy_interface/legacy_real_1stage_c_version.c

@@ -233,9 +233,12 @@ int main(int argc, char** argv) {
 
 #ifdef DOUBLE_PRECISION_REAL
    /* check the results */
-   status = check_correctness_evp_numeric_residuals_real_double_f(na, nev, na_rows, na_cols, as, z, ev, sc_desc, myid);
+   status = check_correctness_evp_numeric_residuals_real_double_f(na, nev, na_rows, na_cols, as, z, ev,
+                                   sc_desc, nblk, myid, np_rows, np_cols, my_prow, my_pcol);
+
 #else
-   status = check_correctness_evp_numeric_residuals_real_single_f(na, nev, na_rows, na_cols, as, z, ev, sc_desc, myid);
+   status = check_correctness_evp_numeric_residuals_real_single_f(na, nev, na_rows, na_cols, as, z, ev,
+                                   sc_desc, nblk, myid, np_rows, np_cols, my_prow, my_pcol);
 #endif
    if (status !=0){
      printf("The computed EVs are not correct !\n");

test/C/elpa2/legacy_interface/legacy_complex_2stage_c_version.c

@@ -236,9 +236,11 @@ int main(int argc, char** argv) {
 
    /* check the results */
 #ifdef DOUBLE_PRECISION_COMPLEX
-   status = check_correctness_evp_numeric_residuals_complex_double_f(na, nev, na_rows, na_cols, as, z, ev, sc_desc, myid);
+   status = check_correctness_evp_numeric_residuals_complex_double_f(na, nev, na_rows, na_cols, as, z, ev,
+                                   sc_desc, nblk, myid, np_rows, np_cols, my_prow, my_pcol);
 #else
-   status = check_correctness_evp_numeric_residuals_complex_single_f(na, nev, na_rows, na_cols, as, z, ev, sc_desc, myid);
+   status = check_correctness_evp_numeric_residuals_complex_single_f(na, nev, na_rows, na_cols, as, z, ev,
+                                   sc_desc, nblk, myid, np_rows, np_cols, my_prow, my_pcol);
 #endif
    if (status !=0){
      printf("The computed EVs are not correct !\n");

test/C/elpa2/legacy_interface/legacy_real_2stage_c_version.c

@@ -230,9 +230,11 @@ int main(int argc, char** argv) {
 
    /* check the results */
 #ifdef DOUBLE_PRECISION_REAL
-   status = check_correctness_evp_numeric_residuals_real_double_f(na, nev, na_rows, na_cols, as, z, ev, sc_desc, myid);
+   status = check_correctness_evp_numeric_residuals_real_double_f(na, nev, na_rows, na_cols, as, z, ev,
+                                   sc_desc, nblk, myid, np_rows, np_cols, my_prow, my_pcol);
 #else
-   status = check_correctness_evp_numeric_residuals_real_single_f(na, nev, na_rows, na_cols, as, z, ev, sc_desc, myid);
+   status = check_correctness_evp_numeric_residuals_real_single_f(na, nev, na_rows, na_cols, as, z, ev,
+                                   sc_desc, nblk, myid, np_rows, np_cols, my_prow, my_pcol);
 #endif
 
    if (status !=0){

test/C/test.c

@@ -66,19 +66,39 @@
 #error "define exactly one of TEST_SOLVER_1STAGE or TEST_SOLVER_2STAGE"
 #endif
 
+#ifdef TEST_GENERALIZED_DECOMP_EIGENPROBLEM
+#define TEST_GENERALIZED_EIGENPROBLEM
+#endif
+
 #ifdef TEST_SINGLE
 #  define EV_TYPE float
 #  ifdef TEST_REAL
 #    define MATRIX_TYPE float
+#    define PREPARE_MATRIX_RANDOM prepare_matrix_random_real_single_f
+#    define PREPARE_MATRIX_RANDOM_SPD prepare_matrix_random_spd_real_single_f
+#    define CHECK_CORRECTNESS_EVP_NUMERIC_RESIDUALS check_correctness_evp_numeric_residuals_real_single_f
+#    define CHECK_CORRECTNESS_EVP_GEN_NUMERIC_RESIDUALS check_correctness_evp_gen_numeric_residuals_real_single_f
 #  else
 #    define MATRIX_TYPE complex float
+#    define PREPARE_MATRIX_RANDOM prepare_matrix_random_complex_single_f
+#    define PREPARE_MATRIX_RANDOM_SPD prepare_matrix_random_spd_complex_single_f
+#    define CHECK_CORRECTNESS_EVP_NUMERIC_RESIDUALS check_correctness_evp_numeric_residuals_complex_single_f
+#    define CHECK_CORRECTNESS_EVP_GEN_NUMERIC_RESIDUALS check_correctness_evp_gen_numeric_residuals_complex_single_f
 #  endif
 #else
 #  define EV_TYPE double
 #  ifdef TEST_REAL
 #    define MATRIX_TYPE double
+#    define PREPARE_MATRIX_RANDOM prepare_matrix_random_real_double_f
+#    define PREPARE_MATRIX_RANDOM_SPD prepare_matrix_random_spd_real_double_f
+#    define CHECK_CORRECTNESS_EVP_NUMERIC_RESIDUALS check_correctness_evp_numeric_residuals_real_double_f
+#    define CHECK_CORRECTNESS_EVP_GEN_NUMERIC_RESIDUALS check_correctness_evp_gen_numeric_residuals_real_double_f
 #  else
 #    define MATRIX_TYPE complex double
+#    define PREPARE_MATRIX_RANDOM prepare_matrix_random_complex_double_f
+#    define PREPARE_MATRIX_RANDOM_SPD prepare_matrix_random_spd_complex_double_f
+#    define CHECK_CORRECTNESS_EVP_NUMERIC_RESIDUALS check_correctness_evp_numeric_residuals_complex_double_f
+#    define CHECK_CORRECTNESS_EVP_GEN_NUMERIC_RESIDUALS check_correctness_evp_gen_numeric_residuals_complex_double_f
 #  endif
 #endif
 
@@ -101,7 +121,7 @@ int main(int argc, char** argv) {
    int my_blacs_ctxt, sc_desc[9], info;
 
    /* The Matrix */
-   MATRIX_TYPE *a, *as, *z;
+   MATRIX_TYPE *a, *as, *z, *b, *bs;
    EV_TYPE *ev;
 
    int error, status;
@@ -164,18 +184,12 @@ int main(int argc, char** argv) {
    as = calloc(na_rows*na_cols, sizeof(MATRIX_TYPE));
    ev = calloc(na, sizeof(EV_TYPE));
 
-#ifdef TEST_REAL
-#ifdef TEST_DOUBLE
-   prepare_matrix_random_real_double_f(na, myid, na_rows, na_cols, sc_desc, a, z, as);
-#else
-   prepare_matrix_random_real_single_f(na, myid, na_rows, na_cols, sc_desc, a, z, as);
-#endif
-#else
-#ifdef TEST_DOUBLE
-   prepare_matrix_random_complex_double_f(na, myid, na_rows, na_cols, sc_desc, a, z, as);
-#else
-   prepare_matrix_random_complex_single_f(na, myid, na_rows, na_cols, sc_desc, a, z, as);
-#endif
+   PREPARE_MATRIX_RANDOM(na, myid, na_rows, na_cols, sc_desc, a, z, as);
+
+#if defined(TEST_GENERALIZED_EIGENPROBLEM)
+   b  = calloc(na_rows*na_cols, sizeof(MATRIX_TYPE));
+   bs = calloc(na_rows*na_cols, sizeof(MATRIX_TYPE));
+   PREPARE_MATRIX_RANDOM_SPD(na, myid, na_rows, na_cols, sc_desc, b, z, bs, nblk, np_rows, np_cols, my_prow, my_pcol);
 #endif
 
    if (elpa_init(CURRENT_API_VERSION) != ELPA_OK) {
@@ -243,27 +257,30 @@ int main(int argc, char** argv) {
    if (myid == 0) {
      printf("Solver is set to %d \n", value);
    }
+
+#if defined(TEST_GENERALIZED_EIGENPROBLEM)
+     elpa_generalized_eigenvectors(handle, a, b, ev, z, sc_desc, 0, &error);
+#if defined(TEST_GENERALIZED_DECOMP_EIGENPROBLEM)
+     //a = as, so that the problem can be solved again
+     memcpy(a, as, na_rows * na_cols * sizeof(MATRIX_TYPE));
+     elpa_generalized_eigenvectors(handle, a, b, ev, z, sc_desc, 1, &error);
+#endif
+#else
    /* Solve EV problem */
    elpa_eigenvectors(handle, a, ev, z, &error);
+#endif
    assert_elpa_ok(error);
 
    elpa_deallocate(handle);
    elpa_uninit();
 
-
    /* check the results */
-#ifdef TEST_REAL
-#ifdef TEST_DOUBLE
-   status = check_correctness_evp_numeric_residuals_real_double_f(na, nev, na_rows, na_cols, as, z, ev, sc_desc, myid);
+#if defined(TEST_GENERALIZED_EIGENPROBLEM)
+   status = CHECK_CORRECTNESS_EVP_GEN_NUMERIC_RESIDUALS(na, nev, na_rows, na_cols, as, z, ev,
+                                sc_desc, nblk, myid, np_rows, np_cols, my_prow, my_pcol, bs);
 #else
-   status = check_correctness_evp_numeric_residuals_real_single_f(na, nev, na_rows, na_cols, as, z, ev, sc_desc, myid);
-#endif
-#else
-#ifdef TEST_DOUBLE
-   status = check_correctness_evp_numeric_residuals_complex_double_f(na, nev, na_rows, na_cols, as, z, ev, sc_desc, myid);
-#else
-   status = check_correctness_evp_numeric_residuals_complex_single_f(na, nev, na_rows, na_cols, as, z, ev, sc_desc, myid);
-#endif
+   status = CHECK_CORRECTNESS_EVP_NUMERIC_RESIDUALS(na, nev, na_rows, na_cols, as, z, ev,
+                                sc_desc, nblk, myid, np_rows, np_cols, my_prow, my_pcol);
 #endif
 
    if (status !=0){
@@ -277,6 +294,10 @@ int main(int argc, char** argv) {
    free(z);
    free(as);
    free(ev);
+#if defined(TEST_GENERALIZED_EIGENPROBLEM)
+   free(b);
+   free(bs);
+#endif
 
 #ifdef WITH_MPI
    MPI_Finalize();

test/C/test_autotune.c

@@ -234,19 +234,23 @@ int main(int argc, char** argv) {
       /* check the results */
 #ifdef TEST_REAL
 #ifdef TEST_DOUBLE
-      status = check_correctness_evp_numeric_residuals_real_double_f(na, nev, na_rows, na_cols, as, z, ev, sc_desc, myid);
+      status = check_correctness_evp_numeric_residuals_real_double_f(na, nev, na_rows, na_cols, as, z, ev,
+                                sc_desc, nblk, myid, np_rows, np_cols, my_prow, my_pcol);
       memcpy(a, as, na_rows*na_cols*sizeof(double));
 
 #else
-      status = check_correctness_evp_numeric_residuals_real_single_f(na, nev, na_rows, na_cols, as, z, ev, sc_desc, myid);
+      status = check_correctness_evp_numeric_residuals_real_single_f(na, nev, na_rows, na_cols, as, z, ev,
+                                sc_desc, nblk, myid, np_rows, np_cols, my_prow, my_pcol);
       memcpy(a, as, na_rows*na_cols*sizeof(float));
 #endif
 #else
 #ifdef TEST_DOUBLE
-      status = check_correctness_evp_numeric_residuals_complex_double_f(na, nev, na_rows, na_cols, as, z, ev, sc_desc, myid);
+      status = check_correctness_evp_numeric_residuals_complex_double_f(na, nev, na_rows, na_cols, as, z, ev,
+                                sc_desc, nblk, myid, np_rows, np_cols, my_prow, my_pcol);
       memcpy(a, as, na_rows*na_cols*sizeof(complex double));
 #else
-      status = check_correctness_evp_numeric_residuals_complex_single_f(na, nev, na_rows, na_cols, as, z, ev, sc_desc, myid);
+      status = check_correctness_evp_numeric_residuals_complex_single_f(na, nev, na_rows, na_cols, as, z, ev,
+                                sc_desc, nblk, myid, np_rows, np_cols, my_prow, my_pcol);
       memcpy(a, as, na_rows*na_cols*sizeof(complex float));
 #endif
 #endif

test/shared/test_check_correctness_template.F90

@@ -197,24 +197,19 @@
 #else /* WITH_MPI */
       call PRECISION_GEMM(BLAS_TRANS_OR_CONJ,'N',nev,nev,na,ONE,z,na,z,na,ZERO,tmp1,na)
 #endif /* WITH_MPI */
-      !TODO for the C interface, not all information is passed (zeros instead)
-      !TODO than this part of the test cannot be done
-      !TODO either we will not have this part of test at all, or it will be improved
-      if(nblk > 0) then
-        ! First check, whether the elements on diagonal are 1 .. "normality" of the vectors
-        err = 0.0_rk
-        do i=1, nev
-          if (map_global_array_index_to_local_index(i, i, rowLocal, colLocal, nblk, np_rows, np_cols, my_prow, my_pcol)) then
-             err = max(err, abs(tmp1(rowLocal,colLocal) - 1.0_rk))
-           endif
-        end do
+      ! First check, whether the elements on diagonal are 1 .. "normality" of the vectors
+      err = 0.0_rk
+      do i=1, nev
+        if (map_global_array_index_to_local_index(i, i, rowLocal, colLocal, nblk, np_rows, np_cols, my_prow, my_pcol)) then
+           err = max(err, abs(tmp1(rowLocal,colLocal) - 1.0_rk))
+         endif
+      end do
 #ifdef WITH_MPI
-        call mpi_allreduce(err, errmax, 1, MPI_REAL_PRECISION, MPI_MAX, MPI_COMM_WORLD, mpierr)
+      call mpi_allreduce(err, errmax, 1, MPI_REAL_PRECISION, MPI_MAX, MPI_COMM_WORLD, mpierr)
 #else /* WITH_MPI */
-        errmax = err
+      errmax = err
 #endif /* WITH_MPI */
-        if (myid==0) print *,'Maximal error in eigenvector lengths:',errmax
-      end if
+      if (myid==0) print *,'Maximal error in eigenvector lengths:',errmax
 
       ! Second, find the maximal error in the whole Z**T * Z matrix (its diference from identity matrix)
       ! Initialize tmp2 to unit matrix
@@ -250,28 +245,26 @@
 
 
 #if REALCASE == 1
-
 #ifdef DOUBLE_PRECISION_REAL
     !c> int check_correctness_evp_numeric_residuals_real_double_f(int na, int nev, int na_rows, int na_cols,
-    !c>                                         double *as, double *z, double *ev,
-    !c>                                         int sc_desc[9], int myid);
+    !c>                                         double *as, double *z, double *ev, int sc_desc[9],
+    !c>                                         int nblk, int myid, int np_rows, int np_cols, int my_prow, int my_pcol);
 #else
     !c> int check_correctness_evp_numeric_residuals_real_single_f(int na, int nev, int na_rows, int na_cols,
-    !c>                                         float *as, float *z, float *ev,
-    !c>                                         int sc_desc[9], int myid);
+    !c>                                         float *as, float *z, float *ev, int sc_desc[9],
+    !c>                                         int nblk, int myid, int np_rows, int np_cols, int my_prow, int my_pcol);
 #endif
-
 #endif /* REALCASE */
 
 #if COMPLEXCASE == 1
 #ifdef DOUBLE_PRECISION_COMPLEX
     !c> int check_correctness_evp_numeric_residuals_complex_double_f(int na, int nev, int na_rows, int na_cols,
-    !c>                                         complex double *as, complex double *z, double *ev,
-    !c>                                         int sc_desc[9], int myid);
+    !c>                                         complex double *as, complex double *z, double *ev, int sc_desc[9],
+    !c>                                         int nblk, int myid, int np_rows, int np_cols, int my_prow, int my_pcol);
 #else
     !c> int check_correctness_evp_numeric_residuals_complex_single_f(int na, int nev, int na_rows, int na_cols,
-    !c>                                         complex float *as, complex float *z, float *ev,
-    !c>                                         int sc_desc[9], int myid);
+    !c>                                         complex float *as, complex float *z, float *ev, int sc_desc[9],
+    !c>                                         int nblk, int myid, int np_rows, int np_cols, int my_prow, int my_pcol);
 #endif
 #endif /* COMPLEXCASE */
 
@@ -279,7 +272,7 @@ function check_correctness_evp_numeric_residuals_&
 &MATH_DATATYPE&
 &_&
 &PRECISION&
-&_f (na, nev, na_rows, na_cols, as, z, ev, sc_desc, myid) result(status) &
+&_f (na, nev, na_rows, na_cols, as, z, ev, sc_desc, nblk, myid, np_rows, np_cols, my_prow, my_pcol) result(status) &
       bind(C,name="check_correctness_evp_numeric_residuals_&
       &MATH_DATATYPE&
       &_&
@@ -292,22 +285,82 @@ function check_correctness_evp_numeric_residuals_&
 #include "../../src/general/precision_kinds.F90"
 
       integer(kind=c_int)            :: status
-      integer(kind=c_int), value     :: na, nev, myid, na_rows, na_cols
+      integer(kind=c_int), value     :: na, nev, myid, na_rows, na_cols, nblk, np_rows, np_cols, my_prow, my_pcol
       MATH_DATATYPE(kind=rck)     :: as(1:na_rows,1:na_cols), z(1:na_rows,1:na_cols)
       real(kind=rck)    :: ev(1:na)
       integer(kind=c_int)            :: sc_desc(1:9)
 
-      ! TODO: I did not want to add all the variables to the C interface as well
-      ! TODO: I think that we should find a better way to pass this information
-      ! TODO: to all the functions anyway (get it from sc_desc, pass elpa_t, etc..)
       status = check_correctness_evp_numeric_residuals_&
       &MATH_DATATYPE&
       &_&
       &PRECISION&
-      & (na, nev, as, z, ev, sc_desc, 0, myid, 0, 0, 0, 0)
+      & (na, nev, as, z, ev, sc_desc, nblk, myid, np_rows, np_cols, my_prow, my_pcol)
+
+    end function
+
+!---- variant for the generalized eigenproblem
+!---- unlike in Fortran, we cannot use optional parameter
+!---- we thus define a different function
+#if REALCASE == 1
+#ifdef DOUBLE_PRECISION_REAL
+    !c> int check_correctness_evp_gen_numeric_residuals_real_double_f(int na, int nev, int na_rows, int na_cols,
+    !c>                                         double *as, double *z, double *ev, int sc_desc[9],
+    !c>                                         int nblk, int myid, int np_rows, int np_cols, int my_prow, int my_pcol,
+    !c>                                         double *bs);
+#else
+    !c> int check_correctness_evp_gen_numeric_residuals_real_single_f(int na, int nev, int na_rows, int na_cols,
+    !c>                                         float *as, float *z, float *ev, int sc_desc[9],
+    !c>                                         int nblk, int myid, int np_rows, int np_cols, int my_prow, int my_pcol, 
+    !c>                                         float *bs);
+#endif
+#endif /* REALCASE */
+
+#if COMPLEXCASE == 1
+#ifdef DOUBLE_PRECISION_COMPLEX
+    !c> int check_correctness_evp_gen_numeric_residuals_complex_double_f(int na, int nev, int na_rows, int na_cols,
+    !c>                                         complex double *as, complex double *z, double *ev, int sc_desc[9],
+    !c>                                         int nblk, int myid, int np_rows, int np_cols, int my_prow, int my_pcol,
+    !c>                                         complex double *bs);
+#else
+    !c> int check_correctness_evp_gen_numeric_residuals_complex_single_f(int na, int nev, int na_rows, int na_cols,
+    !c>                                         complex float *as, complex float *z, float *ev, int sc_desc[9],
+    !c>                                         int nblk, int myid, int np_rows, int np_cols, int my_prow, int my_pcol,
+    !c>                                         complex float *bs);
+#endif
+#endif /* COMPLEXCASE */
+
+function check_correctness_evp_gen_numeric_residuals_&
+&MATH_DATATYPE&
+&_&
+&PRECISION&
+&_f (na, nev, na_rows, na_cols, as, z, ev, sc_desc, nblk, myid, np_rows, np_cols, my_prow, my_pcol, bs) result(status) &
+      bind(C,name="check_correctness_evp_gen_numeric_residuals_&
+      &MATH_DATATYPE&
+      &_&
+      &PRECISION&
+      &_f")
+
+      use iso_c_binding
+
+      implicit none