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 Assumption: the triangular matrix has the diagonal element in the
C "right" place, i.e. the last in its row for Lower and the first
C for Upper.
C
SUBROUTINE ZCOOSV (UPLO,TRANS,DIAG,N,AS,IA,JA,INFOA,B,X,IERROR)
use psb_error_mod
COMPLEX*16 ZERO
PARAMETER (ZERO=(0.0D0,0.0D0))
INTEGER N,IERROR
CHARACTER DIAG, TRANS, UPLO
COMPLEX*16 AS(*), B(*), X(*)
INTEGER IA(*), JA(*),INFOA(*)
COMPLEX*16 ACC
INTEGER I, J, K, NNZ, II, JJ
LOGICAL LOW, TRA, UNI
integer :: debug_level, debug_unit
character(len=20) :: name='zcoosv'
debug_unit = psb_get_debug_unit()
debug_level = psb_get_debug_level()
UNI = (DIAG.EQ.'U')
TRA = (TRANS.EQ.'T')
LOW = (UPLO.EQ.'L')
NNZ = INFOA(1)
IERROR = 0
if (debug_level>=psb_debug_serial_comp_)
+ write(debug_unit,*) trim(name),':',n,nnz,diag,trans,uplo
IF ( .NOT. TRA) THEN
if (debug_level>=psb_debug_serial_comp_)
+ write(debug_unit,*) trim(name),': NOT TRA'
IF (LOW) THEN
if (debug_level>=psb_debug_serial_comp_)
+ write(debug_unit,*) trim(name),': LOW'
IF ( .NOT. UNI) THEN
if (debug_level>=psb_debug_serial_comp_)
+ write(debug_unit,*) trim(name),': NOT UNI'
I = 1
J = I
DO WHILE (I.LE.NNZ)
DO WHILE ((J.LE.NNZ).AND.(IA(J).EQ.IA(I)))
J = J+1
ENDDO
ACC = ZERO
IR = IA(I)
DO K = I, J-2
JC = JA(K)
ACC = ACC + AS(K)*X(JC)
ENDDO
X(IR) = (B(IR)-ACC)/AS(J-1)
I = J
ENDDO
ELSE IF (UNI) THEN
C
C Bug warning: if UNI, some rows might be empty
C
I = 1
if (debug_level>=psb_debug_serial_comp_)
+ write(debug_unit,*) trim(name),': UNILOW ',
+ i,n,nnz,uni,tra,low
DO II = 1, N
DO WHILE ((I.LE.NNZ).AND.(IA(I).LT.II))
I = I + 1
ENDDO
ACC = ZERO
IF ((I.LE.NNZ).AND.(IA(I).EQ.II)) THEN
J = I + 1
DO WHILE ((J.LE.NNZ).AND.(IA(J).EQ.IA(I)))
J = J+1
ENDDO
DO K = I, J-1
JC = JA(K)
ACC = ACC + AS(K)*X(JC)
ENDDO
ELSE
J = I
ENDIF
X(II) = (B(II)-ACC)
I = J
ENDDO
END IF
ELSE IF ( .NOT. LOW) THEN
if (debug_level>=psb_debug_serial_comp_)
+ write(debug_unit,*) trim(name),': NOT LOW'
IF ( .NOT. UNI) THEN
if (debug_level>=psb_debug_serial_comp_)
+ write(debug_unit,*) trim(name),': NOT UNI'
I = NNZ
J = NNZ
DO WHILE (I.GT.0)
DO WHILE ((J.GT.0).AND.(IA(J).EQ.IA(I)))
J = J-1
ENDDO
ACC = ZERO
IR = IA(I)
DO K = I, J+2,-1
JC = JA(K)
ACC = ACC + AS(K)*X(JC)
ENDDO
X(IR) = (B(IR)-ACC)/AS(J+1)
I = J
ENDDO
ELSE IF (UNI) THEN
if (debug_level>=psb_debug_serial_comp_)
+ write(debug_unit,*) trim(name),': UNI'
I = NNZ
DO II = N,1,-1
DO WHILE ((I.GT.0).AND.(IA(I).GT.II))
I = I -1
ENDDO
ACC = ZERO
IF ((I.GT.0).AND.(IA(I).EQ.II)) THEN
J = I - 1
DO WHILE ((J.GT.0).AND.(IA(J).EQ.IA(I)))
J = J-1
ENDDO
DO K = I, J+1, -1
JC = JA(K)
ACC = ACC + AS(K)*X(JC)
ENDDO
ELSE
J = I
ENDIF
X(II) = (B(II)-ACC)
I = J
ENDDO
END IF
END IF
ELSE IF (TRA) THEN
if (debug_level>=psb_debug_serial_comp_)
+ write(debug_unit,*) trim(name),': TRA'
IERROR = 3010
return
CCCCCCCCCCCCCCCC
C
C TBF
C
CCCCCCCCCCCCCCCC
DO 180 I = 1, N
X(I) = B(I)
180 CONTINUE
IF (LOW) THEN
IF ( .NOT. UNI) THEN
DO 220 I = N, 1, -1
X(I) = X(I)/AS(IA(I+1)-1)
ACC = X(I)
DO 200 J = IA(I), IA(I+1) - 2
K = JA(J)
X(K) = X(K) - AS(J)*ACC
200 CONTINUE
220 CONTINUE
ELSE IF (UNI) THEN
DO 260 I = N, 1, -1
ACC = X(I)
DO 240 J = IA(I), IA(I+1) - 1
K = JA(J)
X(K) = X(K) - AS(J)*ACC
240 CONTINUE
260 CONTINUE
END IF
ELSE IF ( .NOT. LOW) THEN
IF ( .NOT. UNI) THEN
DO 300 I = 1, N
X(I) = X(I)/AS(IA(I))
ACC = X(I)
DO 280 J = IA(I) + 1, IA(I+1) - 1
K = JA(J)
X(K) = X(K) - AS(J)*ACC
280 CONTINUE
300 CONTINUE
ELSE IF (UNI) THEN
DO 340 I = 1, N
ACC = X(I)
DO 320 J = IA(I), IA(I+1) - 1
K = JA(J)
X(K) = X(K) - AS(J)*ACC
320 CONTINUE
340 CONTINUE
END IF
END IF
END IF
RETURN
END