From ab545316726524bd56e598d6ed2b836f9e0a8d20 Mon Sep 17 00:00:00 2001
From: schnetter <schnetter@2e825fa2-fb71-486d-8b7f-a5ff3f0f6cb8>
Date: Tue, 22 Oct 2002 22:37:44 +0000
Subject: Removed C99-isms.  *sigh* -- here goes quite a bit of readability.

git-svn-id: http://svn.cactuscode.org/arrangements/CactusNumerical/Slab/trunk@5 2e825fa2-fb71-486d-8b7f-a5ff3f0f6cb8
---
 src/slab.c | 353 ++++++++++++++++++++++++++++++++++++-------------------------
 1 file changed, 208 insertions(+), 145 deletions(-)

diff --git a/src/slab.c b/src/slab.c
index a7280e3..826c2f2 100644
--- a/src/slab.c
+++ b/src/slab.c
@@ -102,11 +102,12 @@ MPI_Allgather (void * sendbuf, int sendcnt, int sendtype,
 	       void * recvbuf, int recvcnt, int recvtype,
 	       MPI_Comm comm)
 {
+  int recvsize;
   assert (sendbuf);
   assert (recvbuf);
   assert (sendcnt == recvcnt);
   assert (sendtype == recvtype);
-  int const recvsize = CCTK_VarTypeSize (recvtype);
+  recvsize = CCTK_VarTypeSize (recvtype);
   assert (size > 0);
   memcpy (recvbuf, sendbuf, recvcnt * recvsize);
   return 0;
@@ -117,11 +118,12 @@ MPI_Alltoall (void * sendbuf, int sendcnt, int sendtype,
 	      void * recvbuf, int recvcnt, int recvtype,
 	      MPI_Comm comm)
 {
+  int recvsize;
   assert (sendbuf);
   assert (recvbuf);
   assert (sendcnt == recvcnt);
   assert (sendtype == recvtype);
-  int const recvsize = CCTK_VarTypeSize (recvtype);
+  recvsize = CCTK_VarTypeSize (recvtype);
   assert (size > 0);
   memcpy (recvbuf, sendbuf, recvcnt * recvsize);
   return 0;
@@ -132,6 +134,7 @@ MPI_Alltoallv (void * sendbuf, int * sendcnt, int * sendoff, int sendtype,
 	       void * recvbuf, int * recvcnt, int * recvoff, int recvtype,
 	       MPI_Comm comm)
 {
+  int recvsize;
   assert (sendbuf);
   assert (recvbuf);
   assert (sendcnt);
@@ -142,7 +145,7 @@ MPI_Alltoallv (void * sendbuf, int * sendcnt, int * sendoff, int sendtype,
   assert (*sendoff == 0);
   assert (*recvoff == 0);
   assert (sendtype == recvtype);
-  int const recvsize = CCTK_VarTypeSize (recvtype);
+  recvsize = CCTK_VarTypeSize (recvtype);
   assert (size > 0);
   memcpy (recvbuf, sendbuf, *recvcnt * recvsize);
   return 0;
@@ -232,6 +235,8 @@ static void active2bbox (struct slabinfo const * restrict const slab,
 			 struct bbox           * restrict const bbox,
 			 int                              const useghosts)
 {
+  int nlghostzones;
+  int nughostzones;
   assert (slab);
   assert (bbox);
   assert (useghosts == 0 || useghosts == 1);
@@ -241,8 +246,8 @@ static void active2bbox (struct slabinfo const * restrict const slab,
   assert (slab->lbbox == 0 || slab->lbbox == 1);
   assert (slab->ubbox == 0 || slab->ubbox == 1);
   assert (slab->nghostzones >= 0);
-  int const nlghostzones = slab->lbbox || useghosts ? 0 : slab->nghostzones;
-  int const nughostzones = slab->ubbox || useghosts ? 0 : slab->nghostzones;
+  nlghostzones = slab->lbbox || useghosts ? 0 : slab->nghostzones;
+  nughostzones = slab->ubbox || useghosts ? 0 : slab->nghostzones;
   bbox->off = slab->lbnd + nlghostzones;
   bbox->len = slab->lsh - nlghostzones - nughostzones;
   bbox->str = 1;
@@ -263,20 +268,24 @@ static void slab2bbox (struct slabinfo const * restrict const slab,
 static int bbox_iscontained (struct bbox const * restrict const inner,
 			     struct bbox const * restrict const outer)
 {
+  int inner_last;
+  int outer_last;
   bbox_check (inner);
   bbox_check (outer);
-  int const inner_last = inner->off + (inner->len - 1) * inner->str;
-  int const outer_last = outer->off + (outer->len - 1) * outer->str;
+  inner_last = inner->off + (inner->len - 1) * inner->str;
+  outer_last = outer->off + (outer->len - 1) * outer->str;
   return inner->off >= outer->off && inner_last <= outer_last;
 }
 
 static void bbox_clip (struct bbox       * restrict const inner,
 		       struct bbox const * restrict const outer)
 {
+  int inner_last;
+  int outer_last;
   bbox_check (inner);
   bbox_check (outer);
-  int inner_last = inner->off + (inner->len - 1) * inner->str;
-  int const outer_last = outer->off + (outer->len - 1) * outer->str;
+  inner_last = inner->off + (inner->len - 1) * inner->str;
+  outer_last = outer->off + (outer->len - 1) * outer->str;
   if (inner->off < outer->off) {
     inner->off += roundup (outer->off - inner->off, inner->str);
   }
@@ -298,17 +307,20 @@ static void bbox_xform (struct bbox       * restrict const ydst,
 			struct bbox const * restrict const xsrc,
 			int                          const flip)
 {
+  int xsrc_last;
+  int xdst_last;
+  int ysrc_last;
+  int ydst_last;
   assert (ydst);
   bbox_check (ysrc);
   bbox_check (xdst);
   bbox_check (xsrc);
   assert (ysrc->str == xsrc->str);
-  int const xsrc_last = xsrc->off + (xsrc->len - 1) * xsrc->str;
-  int const xdst_last = xdst->off + (xdst->len - 1) * xdst->str;
-  int const ysrc_last = ysrc->off + (ysrc->len - 1) * ysrc->str;
+  xsrc_last = xsrc->off + (xsrc->len - 1) * xsrc->str;
+  xdst_last = xdst->off + (xdst->len - 1) * xdst->str;
+  ysrc_last = ysrc->off + (ysrc->len - 1) * ysrc->str;
   ydst->str = xdst->str;
   assert ((ysrc->off - xsrc->off) % ysrc->str == 0);
-  int ydst_last;
   ydst->off = xdst->off + (ysrc->off - xsrc->off) / ysrc->str * ydst->str;
   ydst_last = xdst->off + (ysrc_last - xsrc->off) / ysrc->str * ydst->str;
   if (flip) {
@@ -333,6 +345,29 @@ int Slab_Transfer (cGH                   * const cctkGH,
 		   int                     const dsttype,
 		   void                  * const dstptr)
 {
+  struct info * restrict info;
+  size_t srclentot, dstlentot;
+  
+  struct info * restrict allinfo;
+  struct bbox * restrict srcdetail;
+  struct bbox * restrict dstdetail;
+  
+  int * restrict srccount;
+  int * restrict srcoffset;
+  int * restrict dstcount;
+  int * restrict dstoffset;
+  
+  void * restrict srcdata;
+  void * restrict dstdata;
+  
+  MPI_Comm comm;
+  int size, rank;
+  MPI_Datatype srcdatatype, dstdatatype;
+  
+  int i, j, k;
+  int n;
+  int d;
+  
   /* Check arguments */
   assert (cctkGH);
   assert (dim >= 0);
@@ -342,8 +377,9 @@ int Slab_Transfer (cGH                   * const cctkGH,
   assert (dsttype == CCTK_VARIABLE_REAL);
   assert (dstptr);
   
-  struct info info[dim];
-  for (int d=0; d<dim; ++d) {
+  info = malloc (dim * sizeof *info);
+  assert (info);
+  for (d=0; d<dim; ++d) {
     global2bbox (&xferinfo[d].src, &info[d].src.global);
     local2bbox  (&xferinfo[d].src, &info[d].src.local);
     active2bbox (&xferinfo[d].src, &info[d].src.active, 0);
@@ -366,32 +402,30 @@ int Slab_Transfer (cGH                   * const cctkGH,
   
   {
     int iflag[dim];
-    for (int d=0; d<dim; ++d) {
+    for (d=0; d<dim; ++d) {
       iflag[d] = 0;
     }
-    for (int d=0; d<dim; ++d) {
+    for (d=0; d<dim; ++d) {
       assert (! iflag[info[d].xpose]);
       iflag[info[d].xpose] = 1;
     }
-    for (int d=0; d<dim; ++d) {
+    for (d=0; d<dim; ++d) {
       assert (iflag[d]);
     }
-    for (int d=0; d<dim; ++d) {
+    for (d=0; d<dim; ++d) {
       assert (info[info[d].xpose].src.slab.len == info[d].dst.slab.len);
     }
   }
   
-  size_t srclentot, dstlentot;
   srclentot = 1;
   dstlentot = 1;
-  for (int d=0; d<dim; ++d) {
+  for (d=0; d<dim; ++d) {
     srclentot *= info[d].src.local.len;
     dstlentot *= info[d].dst.local.len;
   }
   
   
   
-  MPI_Comm comm;
 #ifdef CCTK_MPI
 #  if defined CARPET_CARPET
   comm = CarpetMPIComm ();
@@ -409,209 +443,226 @@ int Slab_Transfer (cGH                   * const cctkGH,
     MPI_Barrier (comm);
   }
   
-  int size, rank;
   MPI_Comm_size (comm, &size);
   MPI_Comm_rank (comm, &rank);
   
   assert (sizeof(CCTK_REAL) == sizeof(double));
-  MPI_Datatype srcdatatype, dstdatatype;
   srcdatatype = MPI_DOUBLE;
   dstdatatype = MPI_DOUBLE;
   
   
   
-  struct info allinfo[size][dim];
-  int const info_nints = sizeof(struct info) / sizeof(int);
-  ifdebug fflush (stdout);
-  MPI_Allgather
-    (info,    dim * info_nints, MPI_INT,
-     allinfo, dim * info_nints, MPI_INT, comm);
-  
-  for (int n = 0; n < size; ++n) {
-    for (int d=0; d<dim; ++d) {
-      assert (allinfo[n][d].src.global.off == info[d].src.global.off);
-      assert (allinfo[n][d].src.global.len == info[d].src.global.len);
-      assert (allinfo[n][d].src.global.str == info[d].src.global.str);
-      assert (allinfo[n][d].dst.global.off == info[d].dst.global.off);
-      assert (allinfo[n][d].dst.global.len == info[d].dst.global.len);
-      assert (allinfo[n][d].dst.global.str == info[d].dst.global.str);
-      assert (allinfo[n][d].src.local.str == info[d].src.local.str);
-      assert (allinfo[n][d].dst.local.str == info[d].dst.local.str);
-      assert (allinfo[n][d].src.active.str == info[d].src.active.str);
-      assert (allinfo[n][d].dst.active.str == info[d].dst.active.str);
-      assert (allinfo[n][d].src.slab.str == info[d].src.slab.str);
-      assert (allinfo[n][d].dst.slab.str == info[d].dst.slab.str);
-      assert (allinfo[n][d].xpose == info[d].xpose);
-      assert (allinfo[n][d].flip == info[d].flip);
+  allinfo = malloc (size * dim * sizeof *allinfo);
+  assert (allinfo);
+  {
+    int const info_nints = sizeof(struct info) / sizeof(int);
+    ifdebug fflush (stdout);
+    MPI_Allgather
+      (info,    dim * info_nints, MPI_INT,
+       allinfo, dim * info_nints, MPI_INT, comm);
+  }
+  
+  for (n = 0; n < size; ++n) {
+    for (d=0; d<dim; ++d) {
+      assert (allinfo[n*dim+d].src.global.off == info[d].src.global.off);
+      assert (allinfo[n*dim+d].src.global.len == info[d].src.global.len);
+      assert (allinfo[n*dim+d].src.global.str == info[d].src.global.str);
+      assert (allinfo[n*dim+d].dst.global.off == info[d].dst.global.off);
+      assert (allinfo[n*dim+d].dst.global.len == info[d].dst.global.len);
+      assert (allinfo[n*dim+d].dst.global.str == info[d].dst.global.str);
+      assert (allinfo[n*dim+d].src.local.str == info[d].src.local.str);
+      assert (allinfo[n*dim+d].dst.local.str == info[d].dst.local.str);
+      assert (allinfo[n*dim+d].src.active.str == info[d].src.active.str);
+      assert (allinfo[n*dim+d].dst.active.str == info[d].dst.active.str);
+      assert (allinfo[n*dim+d].src.slab.str == info[d].src.slab.str);
+      assert (allinfo[n*dim+d].dst.slab.str == info[d].dst.slab.str);
+      assert (allinfo[n*dim+d].xpose == info[d].xpose);
+      assert (allinfo[n*dim+d].flip == info[d].flip);
     }
   }
   
   
   
-  struct bbox srcdetail[size][dim];
-  for (int n = 0; n < size; ++n) {
+  srcdetail = malloc (size * dim * sizeof *srcdetail);
+  assert (srcdetail);
+  for (n = 0; n < size; ++n) {
     ifdebug printf ("srcdetail n=%d:\n", n);
-    for (int d=0; d<dim; ++d) {
-      srcdetail[n][d] = allinfo[n][d].src.slab;
+    for (d=0; d<dim; ++d) {
+      srcdetail[n*dim+d] = allinfo[n*dim+d].src.slab;
       ifdebug printf ("   src.slab               d=%d ", d);
-      ifdebug bbox_print (&srcdetail[n][d]);
+      ifdebug bbox_print (&srcdetail[n*dim+d]);
       ifdebug printf ("\n");
-      bbox_clip (&srcdetail[n][d], &info[d].src.active);
+      bbox_clip (&srcdetail[n*dim+d], &info[d].src.active);
       ifdebug printf ("   clipped with src.active d=%d ", d);
-      ifdebug bbox_print (&srcdetail[n][d]);
+      ifdebug bbox_print (&srcdetail[n*dim+d]);
       ifdebug printf ("\n");
     }
-    for (int d=0; d<dim; ++d) {
-      struct bbox whereto = allinfo[n][d].dst.slab;
-      ifdebug printf ("   dst.slab               d=%d ", info[d].xpose);
+    for (d=0; d<dim; ++d) {
+      struct bbox whereto;
+      struct bbox wherefrom;
+      whereto = allinfo[n*dim+d].dst.slab;
+      ifdebug printf ("   dst.slab                d=%d ", info[d].xpose);
       ifdebug bbox_print (&whereto);
       ifdebug printf ("\n");
-      bbox_clip (&whereto, &allinfo[n][d].dst.active);
-      ifdebug printf ("   whereto                d=%d ", info[d].xpose);
+      bbox_clip (&whereto, &allinfo[n*dim+d].dst.active);
+      ifdebug printf ("   whereto                 d=%d ", info[d].xpose);
       ifdebug bbox_print (&whereto);
       ifdebug printf ("\n");
-      struct bbox wherefrom;
       bbox_xform
 	(&wherefrom, &whereto,
-	 &allinfo[n][info[d].xpose].src.slab, &allinfo[n][d].dst.slab,
+	 &allinfo[n*dim+info[d].xpose].src.slab, &allinfo[n*dim+d].dst.slab,
 	 info[d].flip);
-      ifdebug printf ("   wherefrom              d=%d ", info[d].xpose);
+      ifdebug printf ("   wherefrom               d=%d ", info[d].xpose);
       ifdebug bbox_print (&wherefrom);
       ifdebug printf ("\n");
-      bbox_clip (&srcdetail[n][info[d].xpose], &wherefrom);
-      ifdebug printf ("   clipped with wherefrom d=%d ", info[d].xpose);
-      ifdebug bbox_print (&srcdetail[n][info[d].xpose]);
+      bbox_clip (&srcdetail[n*dim+info[d].xpose], &wherefrom);
+      ifdebug printf ("   clipped with wherefrom  d=%d ", info[d].xpose);
+      ifdebug bbox_print (&srcdetail[n*dim+info[d].xpose]);
       ifdebug printf ("\n");
     }
   }
   
-  int srccount[size];
-  int srcoffset[size+1];
+  srccount = malloc (size * sizeof *srccount);
+  assert (srccount);
+  srcoffset = malloc ((size + 1) * sizeof *srcoffset);
+  assert (srcoffset);
   srcoffset[0] = 0;
-  for (int n = 0; n < size; ++n) {
+  for (n = 0; n < size; ++n) {
     srccount[n] = 1;
-    for (int d=0; d<dim; ++d) {
-      srccount[n] *= srcdetail[n][d].len;
+    for (d=0; d<dim; ++d) {
+      srccount[n] *= srcdetail[n*dim+d].len;
     }
     ifdebug printf
       ("srccnt n=%d offset=%d count=%d\n", n, srcoffset[n], srccount[n]);
     srcoffset[n+1] = srcoffset[n] + srccount[n];
   }
-  void * restrict srcdata = malloc (srcoffset[size] * sizeof(CCTK_REAL));
+  srcdata = malloc (srcoffset[size] * sizeof(CCTK_REAL));
   assert (srcoffset[size] == 0 || srcdata);
   ifcheck {
+    CCTK_REAL * restrict const srcptr = srcdata;
     CCTK_REAL marker;
     memset (&marker, -1, sizeof marker);
-    CCTK_REAL * restrict const srcptr = srcdata;
-    for (size_t i = 0; i < srcoffset[size]; ++i) {
+    for (i = 0; i < srcoffset[size]; ++i) {
       memcpy (&srcptr[i], &marker, sizeof marker);
     }
   }
   
-  struct bbox dstdetail[size][dim];
-  for (int n = 0; n < size; ++n) {
+  dstdetail = malloc (size * dim * sizeof *dstdetail);
+  assert (dstdetail);
+  for (n = 0; n < size; ++n) {
     ifdebug printf ("dstdetail n=%d:\n", n);
-    for (int d=0; d<dim; ++d) {
-      dstdetail[n][d] = allinfo[n][d].dst.slab;
-      ifdebug printf ("   dst.slab               d=%d ", d);
-      ifdebug bbox_print (&dstdetail[n][d]);
+    for (d=0; d<dim; ++d) {
+      struct bbox wherefrom;
+      struct bbox whereto;
+      dstdetail[n*dim+d] = allinfo[n*dim+d].dst.slab;
+      ifdebug printf ("   dst.slab                d=%d ", d);
+      ifdebug bbox_print (&dstdetail[n*dim+d]);
       ifdebug printf ("\n");
-      bbox_clip (&dstdetail[n][d], &info[d].dst.active);
+      bbox_clip (&dstdetail[n*dim+d], &info[d].dst.active);
       ifdebug printf ("   clipped with dst.active d=%d ", d);
-      ifdebug bbox_print (&dstdetail[n][d]);
+      ifdebug bbox_print (&dstdetail[n*dim+d]);
       ifdebug printf ("\n");
-      struct bbox wherefrom = allinfo[n][info[d].xpose].src.slab;
-      ifdebug printf ("   src.slab               d=%d ", d);
-      ifdebug bbox_print (&dstdetail[n][d]);
+      wherefrom = allinfo[n*dim+info[d].xpose].src.slab;
+      ifdebug printf ("   src.slab                d=%d ", d);
+      ifdebug bbox_print (&dstdetail[n*dim+d]);
       ifdebug printf ("\n");
-      bbox_clip (&wherefrom, &allinfo[n][info[d].xpose].src.active);
-      ifdebug printf ("   wherefrom              d=%d ", d);
-      ifdebug bbox_print (&dstdetail[n][d]);
+      bbox_clip (&wherefrom, &allinfo[n*dim+info[d].xpose].src.active);
+      ifdebug printf ("   wherefrom               d=%d ", d);
+      ifdebug bbox_print (&dstdetail[n*dim+d]);
       ifdebug printf ("\n");
-      struct bbox whereto;
       bbox_xform
 	(&whereto, &wherefrom,
-	 &allinfo[n][d].dst.slab, &allinfo[n][info[d].xpose].src.slab,
+	 &allinfo[n*dim+d].dst.slab, &allinfo[n*dim+info[d].xpose].src.slab,
 	 info[d].flip);
-      ifdebug printf ("   whereto                d=%d ", d);
-      ifdebug bbox_print (&dstdetail[n][d]);
+      ifdebug printf ("   whereto                 d=%d ", d);
+      ifdebug bbox_print (&dstdetail[n*dim+d]);
       ifdebug printf ("\n");
-      bbox_clip (&dstdetail[n][d], &whereto);
-      ifdebug printf ("   clipped with whereto   d=%d ", d);
-      ifdebug bbox_print (&dstdetail[n][d]);
+      bbox_clip (&dstdetail[n*dim+d], &whereto);
+      ifdebug printf ("   clipped with whereto    d=%d ", d);
+      ifdebug bbox_print (&dstdetail[n*dim+d]);
       ifdebug printf ("\n");
     }
   }
   
-  int dstcount[size];
-  int dstoffset[size+1];
+  dstcount = malloc (size * sizeof *dstcount);
+  assert (dstcount);
+  dstoffset = malloc ((size + 1) * sizeof *dstoffset);
+  assert (dstoffset);
   dstoffset[0] = 0;
-  for (int n = 0; n < size; ++n) {
+  for (n = 0; n < size; ++n) {
     dstcount[n] = 1;
-    for (int d=0; d<dim; ++d) {
-      dstcount[n] *= dstdetail[n][d].len;
+    for (d=0; d<dim; ++d) {
+      dstcount[n] *= dstdetail[n*dim+d].len;
     }
     ifdebug printf
       ("dstcnt n=%d offset=%d count=%d\n", n, dstoffset[n], dstcount[n]);
     dstoffset[n+1] = dstoffset[n] + dstcount[n];
   }
-  void * restrict dstdata = malloc (dstoffset[size] * sizeof(CCTK_REAL));
+  dstdata = malloc (dstoffset[size] * sizeof(CCTK_REAL));
   assert (dstoffset[size] == 0 || dstdata);
   ifcheck {
+    CCTK_REAL * restrict const dstptr = dstdata;
     CCTK_REAL marker;
     memset (&marker, -1, sizeof marker);
-    CCTK_REAL * restrict const dstptr = dstdata;
-    for (size_t i = 0; i < dstoffset[size]; ++i) {
+    for (i = 0; i < dstoffset[size]; ++i) {
       memcpy (&dstptr[i], &marker, sizeof marker);
     }
   }
   
   ifcheck {
-    int src2count[size];
-    int dst2count[size];
+    int * restrict src2count;
+    int * restrict dst2count;
+    src2count = malloc (size * sizeof *src2count);
+    assert (src2count);
+    dst2count = malloc (size * sizeof *dst2count);
+    assert (dst2count);
     ifdebug fflush (stdout);
     MPI_Alltoall (srccount, 1, MPI_INT, src2count, 1, MPI_INT, comm);
     MPI_Alltoall (dstcount, 1, MPI_INT, dst2count, 1, MPI_INT, comm);
-    for (int n = 0; n < size; ++n) {
+    for (n = 0; n < size; ++n) {
       assert (src2count[n] == dstcount[n]);
       assert (dst2count[n] == srccount[n]);
     }
+    free (src2count);
+    free (dst2count);
   }
   
   
   
-  for (int n = 0; n < size; ++n) {
+  for (n = 0; n < size; ++n) {
     assert (dim == 3);
-    for (int k = 0; k < srcdetail[n][info[2].xpose].len; ++k) {
-      for (int j = 0; j < srcdetail[n][info[1].xpose].len; ++j) {
-	for (int i = 0; i < srcdetail[n][info[0].xpose].len; ++i) {
-	  int ipos[dim];
+    for (k = 0; k < srcdetail[n*dim+info[2].xpose].len; ++k) {
+      for (j = 0; j < srcdetail[n*dim+info[1].xpose].len; ++j) {
+	for (i = 0; i < srcdetail[n*dim+info[0].xpose].len; ++i) {
+	  int ipos[3];
+	  int srcipos[3];
+	  int bufipos[3];
+	  size_t srcind;
+	  size_t bufind;
 	  ipos[0] = i;
 	  ipos[1] = j;
 	  ipos[2] = k;
-	  int srcipos[dim];
-	  int bufipos[dim];
-	  for (int d=0; d<dim; ++d) {
+	  for (d=0; d<dim; ++d) {
 	    int const c = info[d].xpose;
-	    srcipos[c] = srcdetail[n][c].off + ipos[d] * srcdetail[n][c].str;
+	    srcipos[c] = srcdetail[n*dim+c].off + ipos[d] * srcdetail[n*dim+c].str;
 	    assert (srcipos[c] >= info[c].src.local.off
 		    && srcipos[c] < info[c].src.local.off + info[c].src.local.len);
-	    if (! (srcipos[c] >= allinfo[n][c].src.slab.off
-		   && srcipos[c] <= allinfo[n][c].src.slab.off + (allinfo[n][c].src.slab.len - 1) * allinfo[n][c].src.slab.str)) {
-	      printf ("ssc n=%d ipos=[%d,%d,%d] d=%d srcipos=%d slab.off=%d slab.len=%d\n", n, i, j, k, d, srcipos[c], allinfo[n][c].src.slab.off, allinfo[n][c].src.slab.len);
+	    if (! (srcipos[c] >= allinfo[n*dim+c].src.slab.off
+		   && srcipos[c] <= allinfo[n*dim+c].src.slab.off + (allinfo[n*dim+c].src.slab.len - 1) * allinfo[n*dim+c].src.slab.str)) {
+	      printf ("ssc n=%d ipos=[%d,%d,%d] d=%d srcipos=%d slab.off=%d slab.len=%d\n", n, i, j, k, d, srcipos[c], allinfo[n*dim+c].src.slab.off, allinfo[n*dim+c].src.slab.len);
 	    }
-	    assert (srcipos[c] >= allinfo[n][c].src.slab.off
-		    && srcipos[c] <= allinfo[n][c].src.slab.off + (allinfo[n][c].src.slab.len - 1) * allinfo[n][c].src.slab.str);
-	    assert ((srcipos[c] - allinfo[n][c].src.slab.off) % allinfo[n][c].src.slab.str == 0);
+	    assert (srcipos[c] >= allinfo[n*dim+c].src.slab.off
+		    && srcipos[c] <= allinfo[n*dim+c].src.slab.off + (allinfo[n*dim+c].src.slab.len - 1) * allinfo[n*dim+c].src.slab.str);
+	    assert ((srcipos[c] - allinfo[n*dim+c].src.slab.off) % allinfo[n*dim+c].src.slab.str == 0);
 	    bufipos[d] = ipos[d];
-	    assert (bufipos[d] >= 0 && bufipos[d] < srcdetail[n][c].len);
+	    assert (bufipos[d] >= 0 && bufipos[d] < srcdetail[n*dim+c].len);
 	  }
-	  size_t srcind = 0;
-	  size_t bufind = 0;
-	  for (int d=dim-1; d>=0; --d) {
+	  srcind = 0;
+	  bufind = 0;
+	  for (d=dim-1; d>=0; --d) {
 	    int const c = info[d].xpose;
 	    srcind = srcind * info[d].src.local.len + srcipos[d] - info[d].src.local.off;
-	    bufind = bufind * srcdetail[n][c].len + bufipos[d];
+	    bufind = bufind * srcdetail[n*dim+c].len + bufipos[d];
 	  }
 	  assert (srcind < srclentot);
 	  assert (bufind < srccount[n]);
@@ -623,10 +674,10 @@ int Slab_Transfer (cGH                   * const cctkGH,
   }
   
   ifcheck {
+    const CCTK_REAL * restrict const srcptr = srcdata;
     CCTK_REAL marker;
     memset (&marker, -1, sizeof marker);
-    const CCTK_REAL * restrict const srcptr = srcdata;
-    for (size_t i = 0; i < srcoffset[size]; ++i) {
+    for (i = 0; i < srcoffset[size]; ++i) {
       assert (memcmp(&srcptr[i], &marker, sizeof marker) != 0);
     }
   }
@@ -637,43 +688,45 @@ int Slab_Transfer (cGH                   * const cctkGH,
      dstdata, dstcount, dstoffset, dstdatatype, comm);
   
   ifcheck {
+    const CCTK_REAL * restrict const dstptr = dstdata;
     CCTK_REAL marker;
     memset (&marker, -1, sizeof marker);
-    const CCTK_REAL * restrict const dstptr = dstdata;
-    for (size_t i = 0; i < dstoffset[size]; ++i) {
+    for (i = 0; i < dstoffset[size]; ++i) {
       assert (memcmp(&dstptr[i], &marker, sizeof marker) != 0);
     }
   }
   
-  for (int n = 0; n < size; ++n) {
+  for (n = 0; n < size; ++n) {
     assert (dim == 3);
-    for (int k = 0; k < dstdetail[n][2].len; ++k) {
-      for (int j = 0; j < dstdetail[n][1].len; ++j) {
-	for (int i = 0; i < dstdetail[n][0].len; ++i) {
-	  int ipos[dim];
+    for (k = 0; k < dstdetail[n*dim+2].len; ++k) {
+      for (j = 0; j < dstdetail[n*dim+1].len; ++j) {
+	for (i = 0; i < dstdetail[n*dim+0].len; ++i) {
+	  int ipos[3];
+	  int bufipos[3];
+	  int dstipos[3];
+	  size_t bufind;
+	  size_t dstind;
 	  ipos[0] = i;
 	  ipos[1] = j;
 	  ipos[2] = k;
-	  int bufipos[dim];
-	  int dstipos[dim];
-	  for (int d=0; d<dim; ++d) {
+	  for (d=0; d<dim; ++d) {
 	    if (! info[d].flip) {
 	      bufipos[d] = ipos[d];
 	    } else {
-	      bufipos[d] = dstdetail[n][d].len - 1 - ipos[d];
+	      bufipos[d] = dstdetail[n*dim+d].len - 1 - ipos[d];
 	    }
-	    assert (bufipos[d] >= 0 && bufipos[d] < dstdetail[n][d].len);
-	    dstipos[d] = dstdetail[n][d].off + ipos[d] * info[d].dst.slab.str;
+	    assert (bufipos[d] >= 0 && bufipos[d] < dstdetail[n*dim+d].len);
+	    dstipos[d] = dstdetail[n*dim+d].off + ipos[d] * info[d].dst.slab.str;
 	    assert (dstipos[d] >= info[d].dst.local.off
 		    && dstipos[d] < info[d].dst.local.off + info[d].dst.local.len);
 	    assert (dstipos[d] >= info[d].dst.slab.off
 		    && dstipos[d] <= info[d].dst.slab.off + (info[d].dst.slab.len - 1) * info[d].dst.slab.str);
 	    assert ((dstipos[d] - info[d].dst.slab.off) % info[d].dst.slab.str == 0);
 	  }
-	  size_t bufind = 0;
-	  size_t dstind = 0;
-	  for (int d=dim-1; d>=0; --d) {
-	    bufind = bufind * dstdetail[n][d].len + bufipos[d];
+	  bufind = 0;
+	  dstind = 0;
+	  for (d=dim-1; d>=0; --d) {
+	    bufind = bufind * dstdetail[n*dim+d].len + bufipos[d];
 	    dstind = dstind * info[d].dst.local.len + dstipos[d] - info[d].dst.local.off;
 	  }
 	  assert (bufind < dstcount[n]);
@@ -687,8 +740,18 @@ int Slab_Transfer (cGH                   * const cctkGH,
   
   
   
-  free (srcdata);
   free (dstdata);
+  free (dstcount);
+  free (dstoffset);
+  free (dstdetail);
+  
+  free (srcdata);
+  free (srccount);
+  free (srcoffset);
+  free (srcdetail);
+  
+  free (allinfo);
+  free (info);
   
   
   
-- 
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