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372 lines
12 KiB
Fortran
372 lines
12 KiB
Fortran
C
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C Parallel Sparse BLAS version 2.2
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C (C) Copyright 2006/2007/2008
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C Salvatore Filippone University of Rome Tor Vergata
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C Alfredo Buttari University of Rome Tor Vergata
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C
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C Redistribution and use in source and binary forms, with or without
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C modification, are permitted provided that the following conditions
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C are met:
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C 1. Redistributions of source code must retain the above copyright
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C notice, this list of conditions and the following disclaimer.
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C 2. Redistributions in binary form must reproduce the above copyright
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C notice, this list of conditions, and the following disclaimer in the
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C documentation and/or other materials provided with the distribution.
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C 3. The name of the PSBLAS group or the names of its contributors may
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C not be used to endorse or promote products derived from this
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C software without specific written permission.
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C
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C THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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C ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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C TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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C PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE PSBLAS GROUP OR ITS CONTRIBUTORS
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C BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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C CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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C SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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C INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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C CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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C ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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C POSSIBILITY OF SUCH DAMAGE.
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C
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C
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C SUBROUTINE SCSMM(TRANS,M,N,K,ALPHA,PL,FIDA,DESCRA,A,IA1,IA2,
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C INFOA,PR,B,LDB,BETA,C,LDC,WORK,LWORK,IERROR)
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C Purpose
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C =======
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C
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C Computing matrix-matrix product
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C C <-- ALPHA PL A PR B + BETA C or
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C C <-- ALPHA PL At PR B + BETA C
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C
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C Parameters
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C ==========
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C
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C TRANS - CHARACTER*1
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C On entry TRANS specifies if the routine operates with matrix A
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C or with the transpose of A as follows:
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C TRANS = 'N' -> use matrix A
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C TRANS = 'T' or 'C' -> use A' (transpose of matrix A)
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C Unchanged on exit.
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C
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C M - INTEGER
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C On entry: number of rows of matrix A (A') and
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C number of rows of matrix C
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C Unchanged on exit.
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C
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C N - INTEGER
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C On entry: number of columns of matrix B
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C and number of columns of matrix C.
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C Unchanged on exit.
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C
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C K - INTEGER
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C On entry: number of columns of matrix A (A') and
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C number of rows of matrix B
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C Unchanged on exit.
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C
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C ALPHA - DOUBLE PRECISION
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C On entry: multiplicative constant.
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C Unchanged on exit.
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C
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C PL - INTEGER array of dimension (M)
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C On entry PL specifies the row permutation of matrix A
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C (PL(1) == 0 if no permutation).
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C Unchanged on exit.
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C
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C FIDA - CHARACTER*5
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C On entry FIDA defines the format of the input sparse matrix.
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C Unchanged on exit.
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C
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C DESCRA - CHARACTER*1 array of DIMENSION (9)
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C On entry DESCRA describes the characteristics of the input
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C sparse matrix.
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C Unchanged on exit.
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C
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C A - DOUBLE PRECISION array of DIMENSION (*)
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C On entry A specifies the values of the input sparse
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C matrix.
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C Unchanged on exit.
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C
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C IA1 - INTEGER array of dimension (*)
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C On entry IA1 holds integer information on input sparse
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C matrix. Actual information will depend on data format used.
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C Unchanged on exit.
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C
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C IA2 - INTEGER array of dimension (*)
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C On entry IA2 holds integer information on input sparse
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C matrix. Actual information will depend on data format used.
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C Unchanged on exit.
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C
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C INFOA - INTEGER array of length 10.
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C On entry can hold auxiliary information on input matrices
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C formats or environment of subsequent calls.
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C Might be changed on exit.
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C
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C PR - INTEGER array of dimension (K)
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C On entry PR specifies the column permutation of matrix A
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C (PR(1) == 0 if no permutation).
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C Unchanged on exit.
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C
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C B - DOUBLE PRECISION matrix of dimension (LDB,*)
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C On entry: dense matrix.
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C Unchanged on exit.
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C
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C LDB - INTEGER
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C On entry: leading dimension of B
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C Unchanged on exit.
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C
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C BETA - DOUBLE PRECISION
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C On entry: multiplicative constant.
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C Unchanged on exit.
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C
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C C - DOUBLE PRECISION matrix of dimension (LDC,*)
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C On entry: dense matrix.
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C On exit is updated with the matrix-matrix product.
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C
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C LDC - INTEGER
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C On entry: leading dimension of C
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C Unchanged on exit.
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C
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C WORK - DOUBLE PRECISION array of dimension (LWORK)
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C On entry: work area.
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C On exit INT(WORK(1)) contains the minimum value
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C for LWORK satisfying SCSMM memory requirements.
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C
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C LWORK - INTEGER
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C On entry LWORK specifies the dimension of WORK
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C LWORK should be set as follows:
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C LWORK = (LWORK for DxxxMM) + Pr*K*N + Pl*M*N
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C where Pr (Pl) = 1 if right (left) permutation has to
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C be performed, 0 otherwise.
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C Unchanged on exit.
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C
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C IERROR - INTEGER
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C On exit IERROR contains the value of error flag as follows:
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C IERROR = 0 no error
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C IERROR > 0 warning
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C IERROR < 0 fatal error
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C
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C Local Variables
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C ===============
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C
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C LWORKM - INTEGER
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C Minimum work area dimension for SCSMM
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C
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C LWORKB - INTEGER
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C Work area dimension for matrix B in subroutine DLPUPD
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C
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C LWORKC - INTEGER
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C Work area dimension for matrix C in subroutine DLPUPD
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C
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C LWORKS - INTEGER
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C Work area dimension for subroutine DSWMM
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C
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C P - INTEGER
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C Pointer to work area
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C
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C LP - LOGICAL
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C LP is true if left permutation is required
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C
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C RP - LOGICAL
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C RP is true if right permutation is required
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C
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C Notes
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C =====
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C Some tests have shown that it is more efficient to divide the
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C sparse matrix-dense matrix multiplication step and the dense
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C matrix permutation step, and it is more efficient to put
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C together the left permutation and update (C <- xxx + BETA C)
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C steps. So, the sequence of operations is:
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C Right permutation DLPUPD
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C Matrix-Matrix product DSWMM
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C Left permutation and update DLPUPD
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C In order to avoid useless memory transfer, the above scheme is
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C simplified according to whether right and left permutation have to
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C be performed. If left permutation is not required, the update step
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C is performed in the sparse matrix-dense matrix multiplication kernel.
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C
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C It is not possible to call this subroutine with LWORK=0 to get #
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C the minimal value for LWORK. This functionality needs a better #
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C connection with DxxxMM #
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C
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C
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SUBROUTINE SCSMM(TRANS,M,N,K,ALPHA,PL,FIDA,DESCRA,A,IA1,IA2,
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& INFOA,PR,B,LDB,BETA,C,LDC,WORK,LWORK,IERROR)
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use psb_const_mod
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IMPLICIT NONE
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C .. Scalar Arguments ..
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INTEGER M,N,K,LDB,LDC,LWORK, IERROR
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CHARACTER TRANS
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real(psb_spk_) ALPHA,BETA
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C .. Array Arguments ..
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INTEGER IA1(*),IA2(*),INFOA(*),PL(*),PR(*)
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CHARACTER DESCRA*11, FIDA*5
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real(psb_spk_) A(*),B(LDB,*),C(LDC,*),WORK(*)
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C .. Local Scalars ..
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INTEGER LWORKM, LWORKB, LWORKC, LWORKS, P, ERR_ACT
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LOGICAL LP, RP
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C .. Local Array..
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INTEGER INT_VAL(5)
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CHARACTER*20 NAME
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CHARACTER*30 STRINGS(2)
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C .. External Subroutines ..
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EXTERNAL SSWMM, SLPUPD, SSCAL
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C .. Executable Statements ..
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C
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C Check for argument errors
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C
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NAME = 'SCSMM\0'
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IERROR = 0
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CALL FCPSB_ERRACTIONSAVE(ERR_ACT)
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IF (M.LT.0) THEN
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IERROR = 10
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INT_VAL(1) = 2
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INT_VAL(2) = M
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ELSE IF (K.LT.0) THEN
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IERROR = 10
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INT_VAL(1) = 4
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INT_VAL(2) = K
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ELSE IF (N.LT.0) THEN
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IERROR = 10
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INT_VAL(1) = 3
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INT_VAL(2) = N
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ELSE IF (TRANS.NE.'T' .AND. TRANS.NE.'N' .AND. TRANS.NE.'C') THEN
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IERROR = 40
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INT_VAL(1) = 1
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STRINGS(1) = TRANS//'\0'
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ELSE IF (LDB.LT.K) THEN
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IERROR = 50
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INT_VAL(1) = 15
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INT_VAL(2) = 4
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INT_VAL(3) = LDB
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INT_VAL(4) = K
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ELSE IF (LDC.LT.M) THEN
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IERROR = 50
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INT_VAL(1) = 18
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INT_VAL(2) = 2
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INT_VAL(3) = LDC
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INT_VAL(4) = M
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ENDIF
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C
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C Error handling
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C
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IF(IERROR.NE.0) THEN
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CALL FCPSB_ERRPUSH(IERROR,NAME,INT_VAL)
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GOTO 9999
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END IF
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C
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C Inizializations
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C
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LP = PL(1).NE.0
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RP = PR(1).NE.0
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LWORKB = K*N
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LWORKC = M*N
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LWORKM = 0
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IF (RP) LWORKM = LWORKB
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IF (LP) LWORKM = LWORKM + LWORKC
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IF (LWORK.LT.LWORKM) THEN
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IERROR = 60
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INT_VAL(1) = 20
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INT_VAL(2) = LWORKM
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INT_VAL(3) = LWORK
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CALL FCPSB_ERRPUSH(IERROR,NAME,INT_VAL)
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GOTO 9999
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ENDIF
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LWORKS = LWORK - LWORKM
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C
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C Check for M, N, K
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C
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IF(M.GT.0 .AND. N.GT.0 .AND. K.EQ.0) THEN
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C
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C Only C <-- BETA C required
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C
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C CALL SSCAL(M,BETA,C,IONE)
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ELSE IF(M.LE.0 .OR. N.LE.0 .OR. K.LE.0) THEN
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GOTO 9998
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ENDIF
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C
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C Switching on PR and PL
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C
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IF (LP .AND. RP) THEN
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C
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C Both right and left permutation required
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C
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P=LWORKB+1
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CALL SLPUPD(K,N,PR,B,LDB,SZERO,WORK,K)
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CALL SSWMM(TRANS,M,N,K,ALPHA,FIDA,DESCRA,A,IA1,IA2,INFOA,
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& WORK,K,SZERO,WORK(P),M,WORK(P+LWORKC),LWORKS,IERROR)
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LWORKS = INT(WORK(P+LWORKC))
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IF(IERROR .NE. 0) THEN
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IERROR=4011
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CALL FCPSB_ERRPUSH(IERROR,NAME,INT_VAL)
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GOTO 9999
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ENDIF
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CALL SLPUPD(M,N,PL,WORK(P),M,BETA,C,LDC)
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ELSE IF(.NOT.LP .AND. RP) THEN
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C
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C Only right permutation required
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C
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P=LWORKB+1
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CALL SLPUPD(K,N,PR,B,LDB,SZERO,WORK,K)
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CALL SSWMM(TRANS,M,N,K,ALPHA,FIDA,DESCRA,A,IA1,IA2,INFOA,
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& WORK,K,BETA,C,LDC,WORK(P),LWORKS,IERROR)
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LWORKS = INT(WORK(P))
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IF(IERROR .NE. 0) THEN
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IERROR=4011
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CALL FCPSB_ERRPUSH(IERROR,NAME,INT_VAL)
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GOTO 9999
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ENDIF
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ELSE IF(.NOT.RP .AND. LP) THEN
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C
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C Only left permutation required
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C
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P=LWORKC+1
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CALL SSWMM(TRANS,M,N,K,ALPHA,FIDA,DESCRA,A,IA1,IA2,INFOA,
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& B,LDB,SZERO,WORK,M,WORK(P),LWORKS,IERROR)
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LWORKS = INT(WORK(P))
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IF(IERROR .NE. 0) THEN
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IERROR=4011
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CALL FCPSB_ERRPUSH(IERROR,NAME,INT_VAL)
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GOTO 9999
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ENDIF
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CALL SLPUPD(M,N,PL,WORK,M,BETA,C,LDC)
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ELSE IF(.NOT.RP .AND. .NOT.LP) THEN
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C
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C No permutations required
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C
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CALL SSWMM(TRANS,M,N,K,ALPHA,FIDA,DESCRA,A,IA1,IA2,INFOA,
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& B,LDB,BETA,C,LDC,WORK,LWORKS,IERROR)
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LWORKS = INT(WORK(1))
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IF(IERROR .NE. 0) THEN
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IERROR=4011
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CALL FCPSB_ERRPUSH(IERROR,NAME,INT_VAL)
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GOTO 9999
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ENDIF
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ENDIF
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9998 CONTINUE
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C
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C Return minimum workarea dimension
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C
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LWORKM = LWORKM + LWORKS
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WORK(1) = REAL(LWORKM)
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CALL FCPSB_ERRACTIONRESTORE(ERR_ACT)
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RETURN
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9999 CONTINUE
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CALL FCPSB_ERRACTIONRESTORE(ERR_ACT)
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IF ( ERR_ACT .NE. 0 ) THEN
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CALL FCPSB_SERROR()
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RETURN
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ENDIF
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RETURN
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END
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