text: /* -*- Mode: C; c-basic-offset:4 ; -*- */
  /*
   *
   *  (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_SUM operations on optional datatypes dupported by MPICH2";
  */
  
  typedef struct { double r, i; } d_complex;
  
  /*
   * This test looks at the handling of logical and for types that are not 
   * integers or are not required integers (e.g., long long).  MPICH2 allows
   * these as well.  A strict MPI test should not include this test.
   */
  int main( int argc, char *argv[] )
  {
      int errs = 0;
      int rank, size;
      MPI_Comm      comm;
      char cinbuf[3], coutbuf[3];
      signed char scinbuf[3], scoutbuf[3];
      unsigned char ucinbuf[3], ucoutbuf[3];
      d_complex dinbuf[3], doutbuf[3];
  
      MTest_Init( &argc, &argv );
  
      comm = MPI_COMM_WORLD;
  
      MPI_Comm_rank( comm, &rank );
      MPI_Comm_size( comm, &size );
  
  #ifndef USE_STRICT_MPI
      /* char */
      MTestPrintfMsg( 10, "Reduce of MPI_CHAR\n" );
      cinbuf[0] = 1;
      cinbuf[1] = 0;
      cinbuf[2] = (rank > 0);
  
      coutbuf[0] = 0;
      coutbuf[1] = 1;
      coutbuf[2] = 1;
      MPI_Reduce( cinbuf, coutbuf, 3, MPI_CHAR, MPI_SUM, 0, comm );
      if (rank == 0) {
  	if (size < 128 && coutbuf[0] != size) {
  	    errs++;
  	    fprintf( stderr, "char SUM(1) test failed\n" );
  	}
  	if (size < 128 && coutbuf[1] != 0) {
  	    errs++;
  	    fprintf( stderr, "char SUM(0) test failed\n" );
  	}
  	if (size < 128 && coutbuf[2] != size - 1) {
  	    errs++;
  	    fprintf( stderr, "char SUM(>) test failed\n" );
  	}
      }
  #endif /* USE_MPI_STRICT */
  
      /* signed char */
      MTestPrintfMsg( 10, "Reduce of MPI_SIGNED_CHAR\n" );
      scinbuf[0] = 1;
      scinbuf[1] = 0;
      scinbuf[2] = (rank > 0);
  
      scoutbuf[0] = 0;
      scoutbuf[1] = 1;
      scoutbuf[2] = 1;
      MPI_Reduce( scinbuf, scoutbuf, 3, MPI_SIGNED_CHAR, MPI_SUM, 0, comm );
      if (rank == 0) {
  	if (size < 128 && scoutbuf[0] != size) {
  	    errs++;
  	    fprintf( stderr, "signed char SUM(1) test failed\n" );
  	}
  	if (size < 128 && scoutbuf[1] != 0) {
  	    errs++;
  	    fprintf( stderr, "signed char SUM(0) test failed\n" );
  	}
  	if (size < 128 && scoutbuf[2] != size - 1) {
  	    errs++;
  	    fprintf( stderr, "signed char SUM(>) test failed\n" );
  	}
      }
  
      /* unsigned char */
      MTestPrintfMsg( 10, "Reduce of MPI_UNSIGNED_CHAR\n" );
      ucinbuf[0] = 1;
      ucinbuf[1] = 0;
      ucinbuf[2] = (rank > 0);
  
      ucoutbuf[0] = 0;
      ucoutbuf[1] = 1;
      ucoutbuf[2] = 1;
      MPI_Reduce( ucinbuf, ucoutbuf, 3, MPI_UNSIGNED_CHAR, MPI_SUM, 0, comm );
      if (rank == 0) {
  	if (size < 128 && ucoutbuf[0] != size) {
  	    errs++;
  	    fprintf( stderr, "unsigned char SUM(1) test failed\n" );
  	}
  	if (size < 128 && ucoutbuf[1]) {
  	    errs++;
  	    fprintf( stderr, "unsigned char SUM(0) test failed\n" );
  	}
  	if (size < 128 && ucoutbuf[2] != size - 1) {
  	    errs++;
  	    fprintf( stderr, "unsigned char SUM(>) test failed\n" );
  	}
      }
  
  #ifndef USE_STRICT_MPI
      /* For some reason, complex is not allowed for sum and prod */
      if (MPI_DOUBLE_COMPLEX != MPI_DATATYPE_NULL) {
  	MTestPrintfMsg( 10, "Reduce of MPI_DOUBLE_COMPLEX\n" );
  	/* double complex; may be null if we do not have Fortran support */
  	dinbuf[0].r = 1;
  	dinbuf[1].r = 0;
  	dinbuf[2].r = (rank > 0);
  	dinbuf[0].i = -1;
  	dinbuf[1].i = 0;
  	dinbuf[2].i = -(rank > 0);
  
  	doutbuf[0].r = 0;
  	doutbuf[1].r = 1;
  	doutbuf[2].r = 1;
  	doutbuf[0].i = 0;
  	doutbuf[1].i = 1;
  	doutbuf[2].i = 1;
  	MPI_Reduce( dinbuf, doutbuf, 3, MPI_DOUBLE_COMPLEX, MPI_SUM, 0, comm );
  	if (rank == 0) {
  	    if (doutbuf[0].r != size || doutbuf[0].i != -size) {
  		errs++;
  		fprintf( stderr, "double complex SUM(1) test failed\n" );
  	    }
  	    if (doutbuf[1].r != 0 || doutbuf[1].i != 0) {
  		errs++;
  		fprintf( stderr, "double complex SUM(0) test failed\n" );
  	    }
  	    if (doutbuf[2].r != size - 1 || doutbuf[2].i != 1 - size) {
  		errs++;
  		fprintf( stderr, "double complex SUM(>) test failed\n" );
  	    }
  	}
      }
  #endif /* USE_STRICT_MPI */
  
  #ifdef HAVE_LONG_DOUBLE
      { long double ldinbuf[3], ldoutbuf[3];
      /* long double */
      ldinbuf[0] = 1;
      ldinbuf[1] = 0;
      ldinbuf[2] = (rank > 0);
  
      ldoutbuf[0] = 0;
      ldoutbuf[1] = 1;
      ldoutbuf[2] = 1;
      if (MPI_LONG_DOUBLE != MPI_DATATYPE_NULL) {
  	MTestPrintfMsg( 10, "Reduce of MPI_LONG_DOUBLE\n" );
  	MPI_Reduce( ldinbuf, ldoutbuf, 3, MPI_LONG_DOUBLE, MPI_SUM, 0, comm );
  	if (rank == 0) {
  	    if (ldoutbuf[0] != size) {
  		errs++;
  		fprintf( stderr, "long double SUM(1) test failed\n" );
  	    }
  	    if (ldoutbuf[1] != 0.0) {
  		errs++;
  		fprintf( stderr, "long double SUM(0) test failed\n" );
  	    }
  	    if (ldoutbuf[2] != size - 1) {
  		errs++;
  		fprintf( stderr, "long double SUM(>) test failed\n" );
  	    }
  	}
      }
      }
  #endif
  
  #ifdef HAVE_LONG_LONG
      {
  	long long llinbuf[3], lloutbuf[3];
      /* long long */
      llinbuf[0] = 1;
      llinbuf[1] = 0;
      llinbuf[2] = (rank > 0);
  
      lloutbuf[0] = 0;
      lloutbuf[1] = 1;
      lloutbuf[2] = 1;
      if (MPI_LONG_LONG != MPI_DATATYPE_NULL) {
  	MTestPrintfMsg( 10, "Reduce of MPI_LONG_LONG\n" );
  	MPI_Reduce( llinbuf, lloutbuf, 3, MPI_LONG_LONG, MPI_SUM, 0, comm );
  	if (rank == 0) {
  	    if (lloutbuf[0] != size) {
  		errs++;
  		fprintf( stderr, "long long SUM(1) test failed\n" );
  	    }
  	    if (lloutbuf[1] != 0) {
  		errs++;
  		fprintf( stderr, "long long SUM(0) test failed\n" );
  	    }
  	    if (lloutbuf[2] != size - 1) {
  		errs++;
  		fprintf( stderr, "long long SUM(>) test failed\n" );
  	    }
  	}
      }
      }
  #endif
  
      MTest_Finalize( errs );
      MPI_Finalize();
      return 0;
  }
  