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psblas3/base/serial/csr/dcsrsm.f

128 lines
4.2 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
SUBROUTINE DCSRSM(TRANST,M,N,UNITD,D,ALPHA,DESCRA,A,JA,IA,
* B,LDB,BETA,C,LDC,WORK,LWORK,IERROR)
DOUBLE PRECISION ALPHA, BETA
INTEGER LDB, LDC, LWORK, M, N, IERROR
CHARACTER UNITD, TRANST
DOUBLE PRECISION A(*), B(LDB,*), C(LDC,*), D(*), WORK(*)
INTEGER IA(*), JA(*)
CHARACTER DESCRA*11
INTEGER I, K
CHARACTER DIAG, UPLO
LOGICAL DEBUG
PARAMETER (DEBUG=.FALSE.)
C .. Local Arrays ..
CHARACTER*20 NAME
INTEGER INT_VAL(5), err_Act
NAME = 'DCSRSM\0'
IERROR = 0
CALL FCPSB_ERRACTIONSAVE(ERR_ACT)
int_Val(1)=0
UPLO = '?'
IF (DESCRA(1:1).EQ.'T' .AND. DESCRA(2:2).EQ.'U') UPLO = 'U'
IF (DESCRA(1:1).EQ.'T' .AND. DESCRA(2:2).EQ.'L') UPLO = 'L'
IF (UPLO.EQ.'?') THEN
int_val(1) = 7
IERROR=5
CALL FCPSB_ERRPUSH(IERROR,NAME,INT_VAL)
GOTO 9999
END IF
IF (DESCRA(3:3).EQ.'N') DIAG = 'N'
IF (DESCRA(3:3).EQ.'U') DIAG = 'U'
IF(UNITD.EQ.'B') THEN
IERROR=5
int_val(1) = 4
CALL FCPSB_ERRPUSH(IERROR,NAME,INT_VAL)
GOTO 9999
ENDIF
IF (UNITD.EQ.'R') THEN
DO 40 I = 1, N
DO 20 K = 1, M
B(K,I) = B(K,I)*D(K)
20 CONTINUE
40 CONTINUE
END IF
if ((alpha.ne.1.d0) .or.(beta .ne.0.0d0)) then
if (lwork .lt. m) then
int_val(1) = 17
IERROR=5
CALL FCPSB_ERRPUSH(IERROR,NAME,INT_VAL)
GOTO 9999
END IF
DO I = 1, N
CALL DCSRSV(UPLO,TRANST,DIAG,M,A,JA,IA,B(1,I),work)
do k=1,m
c(k,i) = beta*c(k,i) + alpha*work(k)
enddo
enddo
else
DO 60 I = 1, N
CALL DCSRSV(UPLO,TRANST,DIAG,M,A,JA,IA,B(1,I),C(1,I))
60 CONTINUE
endif
IF(IERROR.NE.0) THEN
INT_VAL(1)=IERROR
CALL FCPSB_ERRPUSH(4012,NAME,INT_VAL)
GOTO 9999
END IF
if (debug) then
write(0,*) 'Check from DCSRSM'
do k=1,m
write(0,*) k, b(k,1),c(k,1)
enddo
endif
IF (UNITD.EQ.'L') THEN
DO 45 I = 1, N
DO 25 K = 1, M
C(K,I) = C(K,I)*D(K)
25 CONTINUE
45 CONTINUE
END IF
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