psblas3/base/serial/dp/dgind_tri.f

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
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C   3. The name of the PSBLAS group or the names of its contributors may
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C
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C
C 
      SUBROUTINE DGIND_TRI(M,N_BLOCKS,A,IA1,IA2,ARN,KA,IA,JA,
     +  LARN,LKA,LJA,IPERM,WORK, LWORK, IERROR)

      use psb_const_mod
      IMPLICIT NONE

C     ... Scalar arguments ...

      INTEGER          M, LWORK,N_BLOCKS,LARN,LKA,LJA, IERROR

C     ... Array arguments ...

      real(psb_dpk_) A(*), ARN(*), WORK(*)
      INTEGER          IA1(*), IA2(*), KA(*), 
     +  IA(3,*), IPERM(M), JA(*)
      
C     .... Local scalars ...
      INTEGER          I, J, BLOCK, ROW, COL, POINT_AR, POINT_JA,
     +  DIM_BLOCK, LIMIT, ERR_ACT
      LOGICAL          CSR
c     .. Local Arrays ..
      CHARACTER*20       NAME
      INTEGER            INT_VAL(5)

      NAME = 'DGIND_TRI\0'
      IERROR = 0
      CALL FCPSB_ERRACTIONSAVE(ERR_ACT)

      POINT_AR = 1
      POINT_JA = 0
      IERROR   = 0

      IF ((LARN.LT.POINT_AR).OR.(LKA.LT.POINT_AR)) THEN
        IERROR = 60
        INT_VAL(1) = 10
        INT_VAL(2) = POINT_AR
        INT_VAL(3) = LARN
        CALL FCPSB_ERRPUSH(IERROR,NAME,INT_VAL)
        GOTO 9999
      ENDIF

C     .... Invert Permutation Matrix...
      IF (IPERM(1).NE.0) THEN
        DO I = 1, M
          WORK(IPERM(I)) = I
        ENDDO
      ENDIF

      DO BLOCK = 1, N_BLOCKS
        COL = 1
        DIM_BLOCK = IA(1,BLOCK+1)-IA(1,BLOCK)
        LIMIT = INT(DIM_BLOCK*PSB_PERCENT_)
        POINT_JA = POINT_JA+1
        IF (LJA.LT.POINT_JA) THEN
          IERROR = 60
          INT_VAL(1) = 12
          INT_VAL(2) = POINT_JA
          INT_VAL(3) = LJA
          CALL FCPSB_ERRPUSH(IERROR,NAME,INT_VAL)
          GOTO 9999
        ENDIF

        IA(2,BLOCK) = POINT_JA
        JA(POINT_JA) = POINT_AR
        CSR = .FALSE.
        
        IF (DIM_BLOCK.NE.0) THEN
C     ... If current block is not empty ...
C     ... For each Column belonging to Block ...
          DO WHILE(.TRUE.)
C     ... For each row belonging to the block BLOCK ...
            DO I = IA(1,BLOCK), IA(1,BLOCK+1)-1
              IF (IPERM(1).EQ.0) THEN
                ROW = I
              ELSE
                ROW = WORK(I)
              ENDIF
              
C     ... If the current row is too short ...
              IF (IA2(ROW)+COL-1.GE.IA2(ROW+1)) THEN
C     ... Switch to CSR representation ...
                IF (I.LE.IA(1,BLOCK)+LIMIT) THEN
                  CSR=.TRUE.
                  POINT_AR = POINT_AR - I + IA(1,BLOCK)
                  GOTO 998
                ELSE
                  ARN(POINT_AR) = 0.D0
C     
C     The following statement assumes that we never get here with POINT_AR=1
C     
                  KA (POINT_AR) = KA(POINT_AR-1)

                  POINT_AR = POINT_AR+1
                  IF ((LARN.LT.POINT_AR).OR.(LKA.LT.POINT_AR))
     +              THEN
                    IERROR = 60
                    INT_VAL(1) = 10
                    INT_VAL(2) = POINT_AR
                    INT_VAL(3) = LARN
                    CALL FCPSB_ERRPUSH(IERROR,NAME,INT_VAL)
                    GOTO 9999
                  ENDIF
                ENDIF
              ELSE
                ARN(POINT_AR) = A(IA2(ROW)+COL-1)
                KA (POINT_AR) = IPERM(IA1(IA2(ROW)+COL-1))

                POINT_AR = POINT_AR+1
                IF ((LARN.LT.POINT_AR).OR.(LKA.LT.POINT_AR)) THEN
                  IERROR = 60
                  INT_VAL(1) = 10
                  INT_VAL(2) = POINT_AR
                  INT_VAL(3) = LARN
                  CALL FCPSB_ERRPUSH(IERROR,NAME,INT_VAL)
                  GOTO 9999
                ENDIF
              ENDIF
            ENDDO

            IF (CSR) GOTO 998

            IF (LJA.LT.POINT_JA+COL) THEN
              IERROR = 60
              INT_VAL(1) = 12
              INT_VAL(2) = POINT_JA
              INT_VAL(3) = LJA
              CALL FCPSB_ERRPUSH(IERROR,NAME,INT_VAL)
              GOTO 9999
            ENDIF
            
            JA(POINT_JA+COL) = POINT_AR
            COL = COL+1
          ENDDO
 998      CONTINUE 

        ENDIF

        POINT_JA = POINT_JA+COL-1
        
        IF (LJA.LT.POINT_JA) THEN
          IERROR = 60
          INT_VAL(1) = 12
          INT_VAL(2) = POINT_JA
          INT_VAL(3) = LJA
          CALL FCPSB_ERRPUSH(IERROR,NAME,INT_VAL)
          GOTO 9999
        ENDIF

        IA(3,BLOCK) = POINT_JA
        
C     ... Start CSR Format ...
        
C     ... For each row belonging to the block BLOCK ...
        DO I = IA(1,BLOCK), IA(1,BLOCK+1)-1
          IF (IPERM(1).EQ.0) THEN
            ROW = I
          ELSE
            ROW = WORK(I)
          ENDIF

C     ... For each nnzero elements belonging to current row ...
          DO J = IA2(ROW)+COL-1, IA2(ROW+1)-1
            ARN(POINT_AR) = A(J)
            KA (POINT_AR) = IPERM(IA1(J))

            POINT_AR = POINT_AR+1
            IF ((LARN.LT.POINT_AR).OR.(LKA.LT.POINT_AR)) THEN
              IERROR = 60
              INT_VAL(1) = 10
              INT_VAL(2) = POINT_AR
              INT_VAL(3) = LARN
              CALL FCPSB_ERRPUSH(IERROR,NAME,INT_VAL)
              GOTO 9999
            ENDIF
          ENDDO

          POINT_JA = POINT_JA+1
          IF (LJA.LT.POINT_JA) THEN
            IERROR = 60
            INT_VAL(1) = 12
            INT_VAL(2) = POINT_JA
            INT_VAL(3) = LJA
            CALL FCPSB_ERRPUSH(IERROR,NAME,INT_VAL)
            GOTO 9999
          ENDIF
          
          JA(POINT_JA) = POINT_AR
        ENDDO
      ENDDO

      IA(2,N_BLOCKS+1) = POINT_JA

      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