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 C SUBROUTINE DSWSM(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' or 'C' -> use T' (transpose of matrix 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 - DOUBLE PRECISION 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 - DOUBLE PRECISION 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 - DOUBLE PRECISION 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 - DOUBLE PRECISION 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 - DOUBLE PRECISION C On entry: multiplicative constant. C Unchanged on exit. C C C - DOUBLE PRECISION 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 - DOUBLE PRECISION 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 DSWSM(TRANS,M,N,ALPHA,UNITD,D,FIDT,DESCRT,T,IT1,IT2, & INFOT,B,LDB,BETA,C,LDC,WORK,LWORK,IERROR) use psb_const_mod use psb_const_mod use psb_error_mod use psb_string_mod implicit none C .. Scalar Arguments .. INTEGER M, N, LDB, LDC, LWORK, IERROR CHARACTER UNITD, TRANS real(psb_dpk_) ALPHA, BETA C .. Array Arguments .. INTEGER IT1(*), IT2(*), INFOT(*) CHARACTER DESCRT*11, FIDT*5 real(psb_dpk_) T(*), B(LDB,*), C(LDC,*), D(*), WORK(*) C .. Local Scalars .. INTEGER ONE C .. Parameters .. PARAMETER (ONE=1) C .. External Subroutines .. EXTERNAL DCSRSM, DCOPY integer debug_level, debug_unit, err_act, int_val(5) CHARACTER*20 NAME C .. Executable Statements .. NAME = 'DSWSM' IERROR = 0 CALL FCPSB_ERRACTIONSAVE(ERR_ACT) WORK(1) = dzero debug_unit = psb_get_debug_unit() debug_level = psb_get_debug_level() C C Check for identity matrix C IF(psb_toupper(DESCRT(1:1)).EQ.'D' .AND. + psb_toupper(DESCRT(3:3)).EQ.'U') THEN CALL DCOPY(M,B,ONE,C,ONE) GOTO 9998 ENDIF if (debug_level >= psb_debug_serial_comp_) + write(debug_unit,*) trim(name),': entry ',m,n,ierror,' ',unitd C C Switching on FIDT: proper sparse BLAS routine is selected C according to data structure C IF (psb_toupper(FIDT(1:3)).EQ.'CSR') THEN C C T, IT1, IT2 ---> AR, JA, IA C VAL, INDX, PNTR C INFOT(*) not used C CALL DCSRSM(TRANS,M,N,UNITD,D,ALPHA,DESCRT,T,IT1, & IT2,B,LDB,BETA,C,LDC,WORK,LWORK,IERROR) ELSE IF (psb_toupper(FIDT(1:3)).EQ.'JAD') THEN CALL DJADSM(TRANS,M,N,D,UNITD,0,ALPHA,DESCRT,T,IT1,IT2, + 0,B,LDB,BETA,C,LDC,WORK) ELSE IF (psb_toupper(FIDT(1:3)).EQ.'COO') THEN CALL DCOOSM(TRANS,M,N,UNITD,D,ALPHA,DESCRT,T,IT1,IT2,INFOT, + B,LDB,BETA,C,LDC,WORK,LWORK,IERROR) ELSE C C This data structure not yet considered C IERROR = 3010 CALL FCPSB_ERRPUSH(IERROR,NAME,INT_VAL) GOTO 9999 END IF 9998 CONTINUE 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