text: /* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
  /*
   *
   *  (C) 2003 by Argonne National Laboratory.
   *      See COPYRIGHT in top-level directory.
   */
  #include "mpi.h"
  #include "mpitestconf.h"
  #include <stdio.h>
  #include "mpitest.h"
  
  /*
  static char MTEST_Descrip[] = "Test MPI_MINLOC operations on datatypes dupported by MPICH";
  */
  
  /*
   * This test looks at the handling of char and types that  are not required
   * integers (e.g., long long).  MPICH allows
   * these as well.  A strict MPI test should not include this test.
   *
   * The rule on min loc is that if there is a tie in the value, the minimum
   * rank is used (see 4.9.3 in the MPI-1 standard)
   */
  int main(int argc, char *argv[])
  {
      int errs = 0;
      int rank, size;
      MPI_Comm comm;
  
      MTest_Init(&argc, &argv);
  
      comm = MPI_COMM_WORLD;
  
      MPI_Comm_rank(comm, &rank);
      MPI_Comm_size(comm, &size);
  
      /* 2 int */
      {
          struct twoint {
              int val;
              int loc;
          } cinbuf[3], coutbuf[3];
  
          cinbuf[0].val = 1;
          cinbuf[0].loc = rank;
          cinbuf[1].val = 0;
          cinbuf[1].loc = rank;
          cinbuf[2].val = (rank & 0x7f);
          cinbuf[2].loc = rank;
  
          coutbuf[0].val = 0;
          coutbuf[0].loc = -1;
          coutbuf[1].val = 1;
          coutbuf[1].loc = -1;
          coutbuf[2].val = 1;
          coutbuf[2].loc = -1;
          MPI_Reduce(cinbuf, coutbuf, 3, MPI_2INT, MPI_MINLOC, 0, comm);
          if (rank == 0) {
              if (coutbuf[0].val != 1 && coutbuf[0].loc != -1) {
                  errs++;
                  fprintf(stderr, "2int MINLOC(1) test failed\n");
              }
              if (coutbuf[1].val != 0 && coutbuf[1].loc != -1) {
                  errs++;
                  fprintf(stderr, "2int MINLOC(0) test failed\n");
              }
              if (coutbuf[2].val != 0 && coutbuf[2].loc != 0) {
                  errs++;
                  fprintf(stderr, "2int MINLOC(>) test failed\n");
              }
          }
      }
  
      /* float int */
      {
          struct floatint {
              float val;
              int loc;
          } cinbuf[3], coutbuf[3];
  
          cinbuf[0].val = 1;
          cinbuf[0].loc = rank;
          cinbuf[1].val = 0;
          cinbuf[1].loc = rank;
          cinbuf[2].val = (float) rank;
          cinbuf[2].loc = rank;
  
          coutbuf[0].val = 0;
          coutbuf[0].loc = -1;
          coutbuf[1].val = 1;
          coutbuf[1].loc = -1;
          coutbuf[2].val = 1;
          coutbuf[2].loc = -1;
          MPI_Reduce(cinbuf, coutbuf, 3, MPI_FLOAT_INT, MPI_MINLOC, 0, comm);
          if (rank == 0) {
              if (coutbuf[0].val != 1 && coutbuf[0].loc != -1) {
                  errs++;
                  fprintf(stderr, "float-int MINLOC(1) test failed\n");
              }
              if (coutbuf[1].val != 0 && coutbuf[1].loc != -1) {
                  errs++;
                  fprintf(stderr, "float-int MINLOC(0) test failed\n");
              }
              if (coutbuf[2].val != 0 && coutbuf[2].loc != 0) {
                  errs++;
                  fprintf(stderr, "float-int MINLOC(>) test failed\n");
              }
          }
      }
  
      /* long int */
      {
          struct longint {
              long val;
              int loc;
          } cinbuf[3], coutbuf[3];
  
          cinbuf[0].val = 1;
          cinbuf[0].loc = rank;
          cinbuf[1].val = 0;
          cinbuf[1].loc = rank;
          cinbuf[2].val = rank;
          cinbuf[2].loc = rank;
  
          coutbuf[0].val = 0;
          coutbuf[0].loc = -1;
          coutbuf[1].val = 1;
          coutbuf[1].loc = -1;
          coutbuf[2].val = 1;
          coutbuf[2].loc = -1;
          MPI_Reduce(cinbuf, coutbuf, 3, MPI_LONG_INT, MPI_MINLOC, 0, comm);
          if (rank == 0) {
              if (coutbuf[0].val != 1 || coutbuf[0].loc != 0) {
                  errs++;
                  fprintf(stderr, "long-int MINLOC(1) test failed\n");
              }
              if (coutbuf[1].val != 0 || coutbuf[1].loc != 0) {
                  errs++;
                  fprintf(stderr, "long-int MINLOC(0) test failed\n");
              }
              if (coutbuf[2].val != 0 || coutbuf[2].loc != 0) {
                  errs++;
                  fprintf(stderr, "long-int MINLOC(>) test failed\n");
              }
          }
      }
  
      /* short int */
      {
          struct shortint {
              short val;
              int loc;
          } cinbuf[3], coutbuf[3];
  
          cinbuf[0].val = 1;
          cinbuf[0].loc = rank;
          cinbuf[1].val = 0;
          cinbuf[1].loc = rank;
          cinbuf[2].val = rank;
          cinbuf[2].loc = rank;
  
          coutbuf[0].val = 0;
          coutbuf[0].loc = -1;
          coutbuf[1].val = 1;
          coutbuf[1].loc = -1;
          coutbuf[2].val = 1;
          coutbuf[2].loc = -1;
          MPI_Reduce(cinbuf, coutbuf, 3, MPI_SHORT_INT, MPI_MINLOC, 0, comm);
          if (rank == 0) {
              if (coutbuf[0].val != 1 || coutbuf[0].loc != 0) {
                  errs++;
                  fprintf(stderr, "short-int MINLOC(1) test failed\n");
              }
              if (coutbuf[1].val != 0 || coutbuf[1].loc != 0) {
                  errs++;
                  fprintf(stderr, "short-int MINLOC(0) test failed\n");
              }
              if (coutbuf[2].val != 0 || coutbuf[2].loc != 0) {
                  errs++;
                  fprintf(stderr, "short-int MINLOC(>) test failed\n");
              }
          }
      }
  
      /* double int */
      {
          struct doubleint {
              double val;
              int loc;
          } cinbuf[3], coutbuf[3];
  
          cinbuf[0].val = 1;
          cinbuf[0].loc = rank;
          cinbuf[1].val = 0;
          cinbuf[1].loc = rank;
          cinbuf[2].val = rank;
          cinbuf[2].loc = rank;
  
          coutbuf[0].val = 0;
          coutbuf[0].loc = -1;
          coutbuf[1].val = 1;
          coutbuf[1].loc = -1;
          coutbuf[2].val = 1;
          coutbuf[2].loc = -1;
          MPI_Reduce(cinbuf, coutbuf, 3, MPI_DOUBLE_INT, MPI_MINLOC, 0, comm);
          if (rank == 0) {
              if (coutbuf[0].val != 1 || coutbuf[0].loc != 0) {
                  errs++;
                  fprintf(stderr, "double-int MINLOC(1) test failed\n");
              }
              if (coutbuf[1].val != 0 || coutbuf[1].loc != 0) {
                  errs++;
                  fprintf(stderr, "double-int MINLOC(0) test failed\n");
              }
              if (coutbuf[2].val != 0 || coutbuf[2].loc != 0) {
                  errs++;
                  fprintf(stderr, "double-int MINLOC(>) test failed\n");
              }
          }
      }
  
  #ifdef HAVE_LONG_DOUBLE
      /* long double int */
      {
          struct longdoubleint {
              long double val;
              int loc;
          } cinbuf[3], coutbuf[3];
          MTEST_VG_MEM_INIT(cinbuf, 3* sizeof(cinbuf[0]));
  
          cinbuf[0].val = 1;
          cinbuf[0].loc = rank;
          cinbuf[1].val = 0;
          cinbuf[1].loc = rank;
          cinbuf[2].val = rank;
          cinbuf[2].loc = rank;
  
          coutbuf[0].val = 0;
          coutbuf[0].loc = -1;
          coutbuf[1].val = 1;
          coutbuf[1].loc = -1;
          coutbuf[2].val = 1;
          coutbuf[2].loc = -1;
          if (MPI_LONG_DOUBLE != MPI_DATATYPE_NULL) {
              MPI_Reduce(cinbuf, coutbuf, 3, MPI_LONG_DOUBLE_INT, MPI_MINLOC, 0, comm);
              if (rank == 0) {
                  if (coutbuf[0].val != 1 || coutbuf[0].loc != 0) {
                      errs++;
                      fprintf(stderr, "long double-int MINLOC(1) test failed\n");
                  }
                  if (coutbuf[1].val != 0 || coutbuf[1].loc != 0) {
                      errs++;
                      fprintf(stderr, "long double-int MINLOC(0) test failed\n");
                  }
                  if (coutbuf[2].val != 0 || coutbuf[2].loc != 0) {
                      errs++;
                      fprintf(stderr, "long double-int MINLOC(>) test failed\n");
                  }
              }
          }
      }
  #endif
  
      MTest_Finalize(errs);
      MPI_Finalize();
      return 0;
  }
  