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git-svn-id: http://svn.cactuscode.org/arrangements/CactusBase/LocalReduce/trunk@7 7daa882c-dc44-4453-834e-278d26b18e6a

1 files changed, 264 insertions, 0 deletions

diff --git a/src/ReductionMin.c b/src/ReductionMin.c
new file mode 100644
index 0000000..8d73384
--- /dev/null
+++ b/src/ReductionMin.c
@@ -0,0 +1,264 @@
+ /*@@
+   @file      ReductionMin.c
+   @date      Thu Apr  3 11:54:53 1997
+   @author    Thomas Radke, Paul Walker
+   @desc
+              Defines the PUGH reduction operator to get the minimum
+              for a set of arbitrary arrays.
+   @enddesc
+   @version   $Id$
+ @@*/
+
+#include <stdlib.h>
+#include <string.h>
+#include <float.h>
+
+#include "local_reductions.h"
+
+static const char *rcsid = "$Id$";
+
+CCTK_FILEVERSION(CCTDevelopment_LocalReduce_ReductionMin_c)
+
+/* local function prototypes */
+static int ReductionMinVal (const cGH *GH,
+                            int proc,
+                            int num_dims,
+                            const int from[/* dim */],
+                            const int to[/* dim */],
+                            int iterator[/* dim */],
+                            const int points_per_dim[/* dim */],
+                            int num_points,
+                            int have_local_points,
+                            int num_inarrays,
+                            const int intypes[/* num_inarrays */],
+                            const void *const inarrays[/* num_inarrays */],
+                            int num_outvals,
+                            CCTK_REAL outvals[/*num_inarrays*num_outvals*/]);
+
+
+/*@@
+  @routine PUGH_ReductionMinValArrays
+  @author  Thomas Radke
+  @date    19 Aug 1999
+  @desc
+           Registered PUGH reduction routine for computing the minima
+           for a set of arrays.
+           The arrays are described by their dimensions and variable type.
+           For the number of output values only 1 is accepted.
+           Type casting of the result is provided by specifying the
+           requested output datatype. The intermediate reduction value
+           is always computed as a CCTK_REAL value internally.
+  @enddesc
+  @history
+  @endhistory
+  @var     GH
+  @vdesc   Pointer to CCTK grid hierarchy
+  @vtype   const cGH *
+  @vio     in
+  @endvar
+  @var     proc
+  @vdesc   processor that should receive the result of operation
+           (negative value means all processors receive the result)
+  @vtype   int
+  @vio     in
+  @endvar
+  @var     num_dims
+  @vdesc   number of dimensions of input arrays
+  @vtype   int
+  @vio     in
+  @endvar
+  @var     dims
+  @vdesc   dimensions of input arrays
+  @vtype   const int *
+  @vio     in
+  @endvar
+  @var     num_inarrays
+  @vdesc   number of input arrays
+  @vtype   int
+  @vio     in
+  @endvar
+  @var     inarrays
+  @vdesc   field of input arrays
+  @vtype   const void *const *
+  @vio     in
+  @endvar
+  @var     intype
+  @vdesc   (common) variable type of input arrays
+  @vtype   int
+  @vio     in
+  @endvar
+  @var     num_outvals
+  @vdesc   number of values per output array
+  @vtype   int
+  @vio     in
+  @endvar
+  @var     outvals
+  @vdesc   pointer to buffer holding the output values
+  @vtype   void *
+  @vio     in
+  @endvar
+  @var     outtype
+  @vdesc   (common) variable type of output arrays
+  @vtype   int
+  @vio     in
+  @endvar
+@@*/
+int ReductionMinValArrays (const cGH *GH,
+                                int proc,
+                                int num_dims,
+                                const int dims[/* num_dims */],
+                                int num_inarrays,
+                                const void *const inarrays[/* num_inarrays */],
+                                int intype,
+                                int num_outvals,
+                                void *outvals /* [num_outvals] */,
+                                int outtype)
+{
+  return (ReductionArrays (GH, proc, num_dims, dims,
+                                intype, num_inarrays, inarrays,
+                                outtype, num_outvals, outvals,
+                                ReductionMinVal));
+}
+
+
+
+/*****************************************************************************/
+/*                             local functions                               */
+/*****************************************************************************/
+/*@@
+   @routine    ReductionMinVal
+   @date       Aug 19 1999
+   @author     Thomas Radke
+   @desc       Returns the minimum for a set of distributed array with
+               'num_points' elements each.
+               Global reduction is done element-wise (num_outvals == 1)
+               or on the results of the local reductions.
+   @enddesc
+@@*/
+static int ReductionMinVal (const cGH *GH,
+                            int proc,
+                            int num_dims,
+                            const int from[/* dim */],
+                            const int to[/* dim */],
+                            int iterator[/* dim */],
+                            const int points_per_dim[/* dim */],
+                            int num_points,
+                            int have_local_points,
+                            int num_inarrays,
+                            const int intypes[/* num_inarrays */],
+                            const void *const inarrays[/* num_inarrays */],
+                            int num_outvals,
+                            CCTK_REAL outvals[/*num_inarrays*num_outvals*/])
+{
+  int i, total_outvals;
+  const char *vtypename;
+#ifdef CCTK_MPI
+  const pGH *pughGH;
+  CCTK_REAL *local_outvals;
+#endif
+
+
+  /* prevent compiler warnings about unused parameters */
+  (void) (GH + 0);
+  (void) (proc + 0);
+  (void) (num_points + 0);
+
+/* macros to complete the ITERATE_ARRAY macro */
+#define INITIAL_REDUCTION_VALUE(array)     ((array)[0])
+#define REDUCTION_OPERATION(min, scalar)   if (min > scalar) min = scalar
+
+  for (i = total_outvals = 0; i < num_inarrays; i++)
+  {
+    switch (intypes[i])
+    {
+      case CCTK_VARIABLE_CHAR:
+        ITERATE_ARRAY (CCTK_BYTE, num_dims, inarrays[i],
+                       from, to, iterator, points_per_dim,
+                       CCTK_BYTE, outvals, num_outvals, total_outvals);
+        break;
+
+      case CCTK_VARIABLE_INT:
+        ITERATE_ARRAY (CCTK_INT, num_dims, inarrays[i],
+                       from, to, iterator, points_per_dim,
+                       CCTK_INT, outvals, num_outvals, total_outvals);
+        break;
+
+#ifdef CCTK_INT1
+      case CCTK_VARIABLE_INT1:
+        ITERATE_ARRAY (CCTK_INT1, num_dims, inarrays[i],
+                       from, to, iterator, points_per_dim,
+                       CCTK_INT1, outvals, num_outvals, total_outvals);
+        break;
+#endif
+
+#ifdef CCTK_INT2
+      case CCTK_VARIABLE_INT2:
+        ITERATE_ARRAY (CCTK_INT2, num_dims, inarrays[i],
+                       from, to, iterator, points_per_dim,
+                       CCTK_INT2, outvals, num_outvals, total_outvals);
+        break;
+#endif
+
+#ifdef CCTK_INT4
+      case CCTK_VARIABLE_INT4:
+        ITERATE_ARRAY (CCTK_INT4, num_dims, inarrays[i],
+                       from, to, iterator, points_per_dim,
+                       CCTK_INT4, outvals, num_outvals, total_outvals);
+        break;
+#endif
+
+#ifdef CCTK_INT8
+      case CCTK_VARIABLE_INT8:
+        ITERATE_ARRAY (CCTK_INT8, num_dims, inarrays[i],
+                       from, to, iterator, points_per_dim,
+                       CCTK_INT8, outvals, num_outvals, total_outvals);
+        break;
+#endif
+
+      case CCTK_VARIABLE_REAL:
+        ITERATE_ARRAY (CCTK_REAL, num_dims, inarrays[i],
+                       from, to, iterator, points_per_dim,
+                       CCTK_REAL, outvals, num_outvals, total_outvals);
+        break;
+
+#ifdef CCTK_REAL4
+      case CCTK_VARIABLE_REAL4:
+        ITERATE_ARRAY (CCTK_REAL4, num_dims, inarrays[i],
+                       from, to, iterator, points_per_dim,
+                       CCTK_REAL4, outvals, num_outvals, total_outvals);
+        break;
+#endif
+
+#ifdef CCTK_REAL8
+      case CCTK_VARIABLE_REAL8:
+        ITERATE_ARRAY (CCTK_REAL8, num_dims, inarrays[i],
+                       from, to, iterator, points_per_dim,
+                       CCTK_REAL8, outvals, num_outvals, total_outvals);
+        break;
+#endif
+
+#ifdef CCTK_REAL16
+      case CCTK_VARIABLE_REAL16:
+        ITERATE_ARRAY (CCTK_REAL16, num_dims, inarrays[i],
+                       from, to, iterator, points_per_dim,
+                       CCTK_REAL16, outvals, num_outvals, total_outvals);
+        break;
+#endif
+
+      default:
+        vtypename = CCTK_VarTypeName (intypes[i]);
+        if (vtypename && strncmp (vtypename, "CCTK_VARIABLE_COMPLEX", 21) == 0)
+        {
+          CCTK_WARN (1, "PUGH_ReductionMinVal: Don't know how to compute "
+                        "the minimum of complex variables !!!");
+        }
+        else
+        {
+          CCTK_WARN (1, "PUGH_ReductionMinVal: Unknown variable type");
+        }
+        return (-1);
+    }
+  }
+
+  return (0);
+}