pdlasizegsep.f

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*
*
      SUBROUTINE pdlasizegsep( DESCA, IPREPAD, IPOSTPAD, SIZEMQRLEFT,
     $                         SIZEMQRRIGHT, SIZEQRF, SIZETMS, SIZEQTQ,
     $                         SIZECHK, SIZESYEVX, ISIZESYEVX,
     $                         SIZESUBTST, ISIZESUBTST, SIZETST,
     $                         ISIZETST )
*
*  -- ScaLAPACK routine (version 1.7) --
*     University of Tennessee, Knoxville, Oak Ridge National Laboratory,
*     and University of California, Berkeley.
*     May 1, 1997
*
*     .. Scalar Arguments ..
      INTEGER            IPOSTPAD, IPREPAD, ISIZESUBTST, ISIZESYEVX,
     $                   ISIZETST, SIZECHK, SIZEMQRLEFT, SIZEMQRRIGHT,
     $                   SIZEQRF, SIZEQTQ, SIZESUBTST, SIZESYEVX,
     $                   SIZETMS, SIZETST
*     ..
*     .. Array Arguments ..
      INTEGER            DESCA( * )
*     ..
*
*  Purpose
*  =======
*
*  PDLASIZEGSEP computes the amount of memory needed by
*    various GSEP test routines, as well as SYGVX itself
*
*  Arguments
*  =========
*
*  DESCA        (global input) INTEGER array dimension ( DLEN_ )
*               Array descriptor as passed to PDSYGVX
*
*  SIZEMQRLEFT  LWORK for the 1st PDORMQR call in PDLAGSY
*
*  SIZEMQRRIGHT LWORK for the 2nd PDORMQR call in PDLAGSY
*
*  SIZEQRF      LWORK for PDGEQRF in PDLAGSY
*
*  SIZETMS      LWORK for PDLATMS
*
*  SIZEQTQ      LWORK for PDSEPQTQ (nexer complex)
*
*  SIZECHK      LWORK for PDGSEPCHK
*
*  SIZESYEVX    LWORK for PDSYGVX
*
*  ISIZESYEVX   LIWORK for PDSYGVX
*
*  SIZESUBTST   LWORK for PDSUBTST
*
*  ISIZESUBTST  LIWORK for PDSUBTST
*
*  SIZETST      LWORK for PDTST
*
*  ISIZETST     LIWORK for PDTST
*
*     .. Parameters ..
      INTEGER            BLOCK_CYCLIC_2D, DLEN_, DTYPE_, CTXT_, M_, N_,
     $                   MB_, NB_, RSRC_, CSRC_, LLD_
      PARAMETER          ( BLOCK_CYCLIC_2D = 1, dlen_ = 9, dtype_ = 1,
     $                   ctxt_ = 2, m_ = 3, n_ = 4, mb_ = 5, nb_ = 6,
     $                   rsrc_ = 7, csrc_ = 8, lld_ = 9 )
*     ..
*     .. Local Scalars ..
      INTEGER            CSRC_A, IACOL, IAROW, ICOFFA, IROFFA, LCM,
     $                   LCMQ, LDA, MQ0, MYCOL, MYROW, N, NB, NEIG, NN,
     $                   NNP, NP, NP0, NPCOL, NPROW, NQ, RSRC_A
*     ..
*     .. External Functions ..
      INTEGER            ICEIL, ILCM, INDXG2P, NUMROC
      EXTERNAL           ICEIL, ILCM, INDXG2P, NUMROC
*     ..
**     .. Executable Statements ..
*       This is just to keep ftnchek happy
*     .. External Subroutines ..
      EXTERNAL           blacs_gridinfo
*     ..
*     .. Intrinsic Functions ..
      INTRINSIC          max
*     ..
*     .. Executable Statements ..
      IF( block_cyclic_2d*csrc_*ctxt_*dlen_*dtype_*lld_*mb_*m_*nb_*n_*
     $    rsrc_.LT.0 )RETURN
*
      n = desca( m_ )
      nb = desca( mb_ )
      rsrc_a = desca( rsrc_ )
      csrc_a = desca( csrc_ )
*
      lda = desca( lld_ )
      CALL blacs_gridinfo( desca( ctxt_ ), nprow, npcol, myrow, mycol )
*
      lcm = ilcm( nprow, npcol )
      lcmq = lcm / npcol
      iroffa = 0
      icoffa = 0
      iarow = indxg2p( 1, nb, myrow, rsrc_a, nprow )
      iacol = indxg2p( 1, nb, mycol, csrc_a, npcol )
      np = numroc( n+iroffa, nb, myrow, iarow, nprow )
      nq = numroc( n+icoffa, nb, mycol, iacol, npcol )
      sizemqrleft = max( ( nb*( nb-1 ) ) / 2, ( np+nq )*nb ) + nb*nb
      sizemqrright = max( ( nb*( nb-1 ) ) / 2,
     $               ( nq+max( np+numroc( numroc( n+icoffa, nb, 0, 0,
     $               npcol ), nb, 0, 0, lcmq ), np ) )*nb ) + nb*nb
      sizeqrf = nb*np + nb*nq + nb*nb
      sizetms = ( lda+1 )*max( 1, nq ) +
     $          max( sizemqrleft, sizemqrright, sizeqrf )
*
      np0 = numroc( n, desca( mb_ ), 0, 0, nprow )
      mq0 = numroc( n, desca( nb_ ), 0, 0, npcol )
      sizeqtq = 0
      sizechk = numroc( n, desca( nb_ ), mycol, 0, npcol )
*
      neig = n
      nn = max( n, nb, 2 )
      np0 = numroc( nn, nb, 0, 0, nprow )
      mq0 = numroc( max( neig, nb, 2 ), nb, 0, 0, npcol )
      sizesyevx = 5*n + max( 5*nn, np0*mq0+2*nb*nb ) +
     $            iceil( neig, nprow*npcol )*nn
      nnp = max( n, nprow*npcol+1, 4 )
      isizesyevx = 6*nnp
*
      sizesubtst = max( sizetms, sizeqtq, sizechk, sizesyevx ) +
     $             iprepad + ipostpad
      isizesubtst = isizesyevx + iprepad + ipostpad
*
*
*     Allow room for A, COPYA and Z and DIAG, WIN, WNEW, GAP, WORK
*
      sizetst = 5*( lda*np+iprepad+ipostpad ) +
     $          4*( n+iprepad+ipostpad ) + sizesubtst
*
*     Allow room for IFAIL, ICLUSTR, and IWORK (all in PDSYGVX)
*
      isizetst = n + 2*nprow*npcol + 2*( iprepad+ipostpad ) +
     $           isizesubtst
*
      RETURN
      END