dgebr2d_.c

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#include "Bdef.h"

#if (INTFACE == C_CALL)
void Cdgebr2d(int ConTxt, char *scope, char *top, int m, int n, double *A,
              int lda, int rsrc, int csrc)
#else
F_VOID_FUNC dgebr2d_(int *ConTxt, F_CHAR scope, F_CHAR top, int *m, int *n,
                     double *A, int *lda, int *rsrc, int *csrc)
#endif
/*
 *  -- V1.1 BLACS routine --
 *  University of Tennessee, May 1, 1996
 *  Written by Clint Whaley.
 *
 *  Purpose
 *  =======
 *  Broadcast/receive for general double precision arrays.
 *
 *  Arguments
 *  =========
 *
 *  ConTxt  (input) Ptr to int
 *          Index into MyConTxts00 (my contexts array).
 *
 *  SCOPE   (input) Ptr to char
 *          Limit the scope of the operation.
 *          = 'R' :   Operation is performed by a process row.
 *          = 'C' :   Operation is performed by a process column.
 *          = 'A' :   Operation is performed by all processes in grid.
 *
 *  TOP     (input) Ptr to char
 *          Controls fashion in which messages flow within the operation.
 *
 *  M       (input) Ptr to int
 *          The number of rows of the matrix A.  M >= 0.
 *
 *  N       (input) Ptr to int
 *          The number of columns of the matrix A.  N >= 0.
 *
 *  A       (output) Ptr to double precision two dimensional array
 *          The m by n matrix A.  Fortran77 (column-major) storage
 *          assumed.
 *
 *  LDA     (input) Ptr to int
 *          The leading dimension of the array A.  LDA >= M.
 *
 *
 *  RSRC    (input) Ptr to int
 *          The process row of the source of the matrix.
 *
 *  CSRC    (input) Ptr to int
 *          The process column of the source of the matrix.
 *
 *
 * ------------------------------------------------------------------------
 */
{
   void BI_ArgCheck(int, int, char *, char, char, char, int, int, int, int,
                    int *, int *);
   int BI_HypBR(BLACSCONTEXT *, BLACBUFF *, SDRVPTR, int);
   void BI_IdringBR(BLACSCONTEXT *, BLACBUFF *, SDRVPTR, int, int);
   void BI_SringBR(BLACSCONTEXT *, BLACBUFF *, SDRVPTR, int);
   void BI_MpathBR(BLACSCONTEXT *, BLACBUFF *, SDRVPTR, int, int);
   void BI_TreeBR(BLACSCONTEXT *, BLACBUFF *, SDRVPTR, int, int);
   void BI_UpdateBuffs(BLACBUFF *);
   BLACBUFF *BI_GetBuff(int);
   int BI_BuffIsFree(BLACBUFF *, int);
   MPI_Datatype BI_GetMpiGeType(BLACSCONTEXT *, int, int, int,
                                   MPI_Datatype, int *);
   void BI_Unpack(BLACSCONTEXT *, BVOID *, BLACBUFF *, MPI_Datatype);
   void BI_Ssend(BLACSCONTEXT *, int, int, BLACBUFF *);
   void BI_Asend(BLACSCONTEXT *, int, int, BLACBUFF *);

   BLACSCONTEXT *ctxt;
   BLACBUFF *bp=NULL;
   SDRVPTR send;
   MPI_Datatype MatTyp;
   int length, src, tlda, error, one=1;
   char ttop, tscope;
   extern BLACBUFF BI_AuxBuff, *BI_ActiveQ;

   MGetConTxt(Mpval(ConTxt), ctxt);
   ttop = F2C_CharTrans(top);
   ttop = Mlowcase(ttop);
   tscope = F2C_CharTrans(scope);
   tscope = Mlowcase(tscope);
#if (BlacsDebugLvl > 0)
   BI_ArgCheck(Mpval(ConTxt), RT_BR, __FILE__, tscope, 'u', 'u', Mpval(m),
               Mpval(n), Mpval(lda), 1, Mpaddress(rsrc), Mpaddress(csrc));
#endif
/*
 *  If the user has set the default broadcast topology, use it instead of
 *  BLACS default
 */
#ifdef DefBSTop
   if (ttop == ' ') ttop = DefBSTop;
#endif
   if (Mpval(m) <= Mpval(lda)) tlda = Mpval(lda);
   else tlda = Mpval(m);

   switch(tscope)
   {
   case 'r':
      ctxt->scp = &ctxt->rscp;
      src = Mpval(csrc);
      break;
   case 'c':
      ctxt->scp = &ctxt->cscp;
      src = Mpval(rsrc);
      break;
   case 'a':
      ctxt->scp = &ctxt->ascp;
      src = Mvkpnum(ctxt, Mpval(rsrc), Mpval(csrc));
      break;
   default:
      BI_BlacsErr(Mpval(ConTxt), __LINE__, __FILE__, "Unknown scope '%c'",
                  tscope);
   }

   MatTyp = BI_GetMpiGeType(ctxt, Mpval(m), Mpval(n), tlda,
                            MPI_DOUBLE, &BI_AuxBuff.N);
/*
 * If using default topology, use MPI native broadcast
 */
   if (ttop == ' ')
   {
      error=MPI_Bcast(A, BI_AuxBuff.N, MatTyp, src, ctxt->scp->comm);
      error=BI_MPI_TYPE_FREE(&MatTyp);
      if (BI_ActiveQ) BI_UpdateBuffs(NULL);
      return;
   }
/*
 * If MPI handles non-contiguous buffering well, always use MPI data types
 * instead of packing
 */
#ifndef MpiBuffGood
/*
 * If A is contiguous, receive and send directly to/from it
 */
   else if ( (tlda == Mpval(m)) || (Mpval(n) == 1) )
   {
#endif
      send = BI_Ssend;
      BI_AuxBuff.Buff = (char *) A;
      BI_AuxBuff.dtype = MatTyp;
      bp = &BI_AuxBuff;
#ifndef MpiBuffGood
   }
/*
 * If A is not contiguous, we receive message as packed so it can be
 * forwarded without further system intervention
 */
   else
   {
      send = BI_Asend;
      error=MPI_Pack_size(one, MatTyp, ctxt->scp->comm, &length);
      bp = BI_GetBuff(length);
      bp->N = length;
      bp->dtype = MPI_PACKED;
#if ZeroByteTypeBug
      if (MatTyp == MPI_BYTE)
      {
         send = BI_Ssend;
         bp->N = 0;
         bp->dtype = MPI_BYTE;
      }
#endif
   }
#endif

   switch(ttop)
   {
   case 'h':
      error = BI_HypBR(ctxt, bp, send, src);
      if (error == NPOW2) BI_TreeBR(ctxt, bp, send, src, 2);
      break;
   case '1':
   case '2':
   case '3':
   case '4':
   case '5':
   case '6':
   case '7':
   case '8':
   case '9':
      BI_TreeBR(ctxt, bp, send, src, ttop-47);
      break;
   case 't':
      BI_TreeBR(ctxt, bp, send, src, ctxt->Nb_bs);
      break;
   case 'i':
      BI_IdringBR(ctxt, bp, send, src, 1);
      break;
   case 'd':
      BI_IdringBR(ctxt, bp, send, src, -1);
      break;
   case 's':
      BI_SringBR(ctxt, bp, send, src);
      break;
   case 'm':
      BI_MpathBR(ctxt, bp, send, src, ctxt->Nr_bs);
      break;
   case 'f':
      BI_MpathBR(ctxt, bp, send, src, FULLCON);
      break;
   default :
      BI_BlacsErr(Mpval(ConTxt), __LINE__, __FILE__, "Unknown topology '%c'",
                  ttop);
   }

/*
 * If we buffered, unpack.
 */
#ifndef MpiBuffGood
   if (bp != &BI_AuxBuff)
   {
      BI_Unpack(ctxt, (BVOID *) A, bp, MatTyp);
      BI_UpdateBuffs(bp);
   }
   else
#endif
   {
      error=BI_MPI_TYPE_FREE(&MatTyp);
      if (BI_ActiveQ) BI_UpdateBuffs(NULL);
   }
}