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psblas3/base/serial/f77/zswsm.f

226 lines
8.1 KiB
FortranFixed

C
C Parallel Sparse BLAS version 2.2
C (C) Copyright 2006/2007/2008
C 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 SUBROUTINE ZSWSM(TRANS,M,N,ALPHA,UNITD,D,FIDT,DESCRT,T,IT1,IT2,
C INFOT,B,LDB,BETA,C,LDC,WORK,LWORK,IERROR)
C
C Purpose
C =======
C
C Solving triangular systems of equations with multiple right-hand sides
C C <-- ALPHA D T-1 B + BETA C or
C C <-- ALPHA D T-t B + BETA C or
C C <-- ALPHA T-1 D B + BETA C or
C C <-- ALPHA T-t D B + BETA C
C Actual computing performed by sparse Toolkit kernels.
C This routine selects the proper kernel for each
C data structure.
C
C Parameters
C ==========
C
C TRANS - CHARACTER*1
C On entry TRANS specifies whether the routine operates with
C matrix T or with the transpose of T as follows:
C TRANS = 'N' -> use matrix T
C TRANS = 'T' -> use T' (transpose of matrix T)
C TRANS = 'C' -> use conjugate transpose of T
C Unchanged on exit.
C
C M - INTEGER
C On entry: number of rows and columns of matrix T
C and number of rows of matrices B and C.
C Unchanged on exit.
C
C N - INTEGER
C On entry: number of columns of matrices B and C
C (number of right-hand sides).
C Unchanged on exit.
C
C ALPHA - COMPLEX*16
C On entry: multiplicative constant.
C Unchanged on exit.
C
C UNITD - CHARACTER*1
C On entry UNITD specifies whether the diagonal matrix is unit
C or whether row or column scaling has to be performed, as follows:
C UNITD = 'U' -> unit matrix (no scaling)
C UNITD = 'L' -> scale on the left (row scaling)
C UNITD = 'R' -> scale on the right (column scaling)
C UNITD = 'B' -> scale on the right and on the left
C with D^1/2
C Unchanged on exit.
C
C D - COMPLEX*16 array of dimension (M)
C On entry D specifies the main diagonal of the matrix used
C for scaling.
C Unchanged on exit.
C
C FIDT - CHARACTER*5
C On entry FIDT defines the format of the input sparse matrix.
C Unchanged on exit.
C
C DESCRT - CHARACTER*1 array of DIMENSION (9)
C On entry DESCRT describes the characteristics of the input
C sparse matrix.
C Unchanged on exit.
C
C
C T - COMPLEX*16 array of DIMENSION (*)
C On entry T specifies the values of the input sparse
C matrix.
C Unchanged on exit.
C
C IT1 - INTEGER array of dimension (*)
C On entry IT1 holds integer information on input sparse
C matrix. Actual information will depend on data format used.
C Unchanged on exit.
C
C IT2 - INTEGER array of dimension (*)
C On entry IT2 holds integer information on input sparse
C matrix. Actual information will depend on data format used.
C Unchanged on exit.
C
C INFOT - 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 B - COMPLEX*16 array of dimension (LDB,*)
C On entry: matrix of right-hand sides
C Unchanged on exit.
C
C LDB - INTEGER
C On entry: leading dimension of B.
C Unchanged on exit.
C
C BETA - COMPLEX*16
C On entry: multiplicative constant.
C Unchanged on exit.
C
C C - COMPLEX*16 array of dimension (LDC,*)
C On exit: solutions of triangular systems
C
C LDC - INTEGER
C On entry: leading dimension of C.
C Unchanged on exit.
C
C WORK - COMPLEX*16 array of dimension (LWORK)
C On entry: work area.
C On exit INT(WORK(1)) contains the minimum value
C for LWORK satisfying DSWSM 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 > 0 warning
C IERROR < 0 fatal error
C
C Note
C ====
C All checks on argument are performed in the calling routine.
C
C
SUBROUTINE ZSWSM(TRANS,M,N,ALPHA,UNITD,D,FIDT,DESCRT,T,IT1,IT2,
& INFOT,B,LDB,BETA,C,LDC,WORK,LWORK,IERROR)
C .. Scalar Arguments ..
INTEGER M, N, LDB, LDC, LWORK, IERROR
CHARACTER UNITD, TRANS
COMPLEX*16 ALPHA, BETA
C .. Array Arguments ..
INTEGER IT1(*), IT2(*), INFOT(*)
CHARACTER DESCRT*11, FIDT*5
COMPLEX*16 T(*), B(LDB,*), C(LDC,*), D(*), WORK(*)
integer ERR_ACT
C .. Local Scalars ..
INTEGER ONE
C .. Parameters ..
PARAMETER (ONE=1)
C .. External Subroutines ..
EXTERNAL ZCSRSM, ZCOPY
CHARACTER*20 NAME
C .. Executable Statements ..
NAME = 'ZSWSM\0'
IERROR = 0
CALL FCPSB_ERRACTIONSAVE(ERR_ACT)
C
C Check for identity matrix
C
IF(DESCRT(1:1).EQ.'D' .AND. DESCRT(3:3).EQ.'U') THEN
CALL ZCOPY(M,B,ONE,C,ONE)
GOTO 9999
ENDIF
C
C Switching on FIDT: proper sparse BLAS routine is selected
C according to data structure
C
IF (FIDT(1:3).EQ.'CSR') THEN
C
C T, IT1, IT2 ---> AR, JA, IA
C VAL, INDX, PNTR
C INFOT(*) not used
C
CALL ZCSRSM(TRANS,M,N,UNITD,D,ALPHA,DESCRT,T,IT1,
& IT2,B,LDB,BETA,C,LDC,WORK,LWORK)
ELSE IF ((FIDT(1:3).EQ.'JAD').AND.(.FALSE.)) THEN
C
C .. JAD format not yet supported
C
C CALL ZJADSM(TRANS,M,N,D,UNITD,0,ALPHA,DESCRT,T,IT1,IT2,0,
C & B,LDB,BETA,C,LDC,WORK)
C
ELSE
C
C This data structure not yet considered
C
IERROR = 3010
CALL FCPSB_ERRPUSH(IERROR,NAME,INT_VAL)
GOTO 9999
END IF
CALL FCPSB_ERRACTIONRESTORE(ERR_ACT)
RETURN
9999 CONTINUE
CALL FCPSB_ERRACTIONRESTORE(ERR_ACT)
IF ( ERR_ACT .NE. 0 ) THEN
CALL FCPSB_SERROR()
ENDIF
RETURN
END