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psblas3/base/serial/dp/djadrp1.f

201 lines
7.2 KiB
Fortran

C
C Parallel Sparse BLAS v2.0
C (C) Copyright 2006 Salvatore Filippone University of Rome Tor Vergata
C Alfredo Buttari University of Rome Tor Vergata
C
C Redistribution and use in source and binary forms, with or without
C modification, are permitted provided that the following conditions
C are met:
C 1. Redistributions of source code must retain the above copyright
C notice, this list of conditions and the following disclaimer.
C 2. Redistributions in binary form must reproduce the above copyright
C notice, this list of conditions, and the following disclaimer in the
C documentation and/or other materials provided with the distribution.
C 3. The name of the PSBLAS group or the names of its contributors may
C not be used to endorse or promote products derived from this
C software without specific written permission.
C
C THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
C ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
C TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
C PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE PSBLAS GROUP OR ITS CONTRIBUTORS
C BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
C CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
C SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
C INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
C CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
C ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
C POSSIBILITY OF SUCH DAMAGE.
C
C
C
C Purpose
C =======
C
C Performing column permutation of a sparse matrix in JAD format.
C
C Parameters
C ==========
C
C TRANS - CHARACTER*1
C On entry TRANS specifies whether the routine will use
C matrix P or the transpose of P for the permutation as follows:
C TRANS = 'N' -> permute with matrix P
C TRANS = 'T' or 'C' -> permute the transpose of P
C Unchanged on exit.
C
C M - INTEGER
C On entry: number of rows of matrix A.
C Unchanged on exit.
C
C N - INTEGER
C On entry: number of columns of matrix A.
C Unchanged on exit.
C
C DESCRA - CHARACTER*5 array of DIMENSION (10)
C On entry DESCRA defines the format of the input sparse matrix.
C Unchanged on exit.
C
C IA1 - INTEGER array of dimension (*)
C On entry IA1 holds integer information on input sparse
C matrix. Actual information will depend on data format used.
C On exit contain integer information on permuted matrix.
C
C IA2 - INTEGER array of dimension (*)
C On entry IA2 holds integer information on input sparse
C matrix. Actual information will depend on data format used.
C On exit contain integer information on permuted matrix.
C
C INFOA - INTEGER array of dimension (10)
C On entry can hold auxiliary information on input matrices
C formats or environment of subsequent calls.
C Might be changed on exit.
C
C P - INTEGER array of dimension (M)
C On entry P specifies the column permutation of matrix A
C (P(1) == 0 if no permutation).
C Unchanged on exit.
C
C IWORK - INTEGER array of dimension (LWORK)
C On entry: work area.
C On exit INT(WORK(1)) contains the minimum value
C for LWORK satisfying DSPRP memory requirements.
C
C LWORK - INTEGER
C On entry LWORK specifies the dimension of WORK
C Unchanged on exit.
C
C IERROR - INTEGER
C On exit IERROR contains the value of error flag as follows:
C IERROR = 0 no error
C IERROR = 4 error on dimension of vector WORK
C IERROR = 32 unknown flag TRANS
C IERROR = 64 LWORK <= 0
C IERROR = 128 this data structure not yet considered
C
C Notes
C =====
C It is not possible to call this subroutine with LWORK=0 to get
C the minimal value for LWORK. This functionality needs a better
C connection with DxxxMM
C
C
SUBROUTINE DJADRP1(TRANS,M,N,DESCRA,NG,KA,IA,JA,
+ P,IWORK,LWORK,IERROR)
IMPLICIT NONE
C .. Scalar Arguments ..
INTEGER LWORK,M, N, NG, IERROR
CHARACTER TRANS
C .. Array Arguments ..
INTEGER KA(*), JA(*), IA(3,*), P(*), IWORK(LWORK)
CHARACTER DESCRA*11
C .. Local Scalars ..
INTEGER I, K, IPG, ERR_ACT
C .. Intrinsic Functions ..
INTRINSIC DBLE
LOGICAL DEBUG
PARAMETER (DEBUG=.FALSE.)
C .. Local Arrays ..
CHARACTER*20 NAME
INTEGER INT_VAL(5)
C
C .. Executable Statements ..
C
NAME = 'DJADRP\0'
IERROR = 0
CALL FCPSB_ERRACTIONSAVE(ERR_ACT)
IF(TRANS.EQ.'N') THEN
IF (DEBUG) WRITE(0,*)'DJADRP1:',NG
DO IPG = 1, NG
DO K = IA(2,IPG), IA(3,IPG)-1
DO I = JA(K), JA(K+1) - 1
KA(I) = P(KA(I))
ENDDO
ENDDO
C Permute CSR
DO K = IA(3,IPG), IA(2,IPG+1)-1
DO I = JA(K), JA(K+1) - 1
KA(I) = P(KA(I))
ENDDO
ENDDO
ENDDO
IWORK(1) = 0
ELSE IF(TRANS.EQ.'T') THEN
C
C LWORK refers here to INTEGER IWORK (alias for WORK)
C
IF(LWORK.LT.M) THEN
IERROR = 60
INT_VAL(1) = 11
INT_VAL(2) = M
INT_VAL(3) = LWORK
CALL FCPSB_ERRPUSH(IERROR,NAME,INT_VAL)
GOTO 9999
ENDIF
C
C Transpose permutation matrix
C
DO 20 I=1,N
IWORK(P(I)) = I
20 CONTINUE
C
C Permute columns
C
DO IPG = 1, NG
DO K = IA(2,IPG), IA(3,IPG)-1
DO I = JA(K), JA(K+1) - 1
KA(I) = IWORK(KA(I))
ENDDO
ENDDO
C Permute CSR
DO K = IA(3,IPG), IA(2,IPG+1)-1
DO I = JA(K), JA(K+1) - 1
KA(I) = IWORK(KA(I))
ENDDO
ENDDO
ENDDO
C
C WORK(1) refers here to a value for a DOUBLE PRECISION WORK
C
IWORK(1) = M+1
ENDIF
CALL FCPSB_ERRACTIONRESTORE(ERR_ACT)
RETURN
9999 CONTINUE
CALL FCPSB_ERRACTIONRESTORE(ERR_ACT)
IF ( ERR_ACT .NE. 0 ) THEN
CALL FCPSB_SERROR()
RETURN
ENDIF
RETURN
END