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psblas3/base/serial/dp/gen_block.f

73 lines
2.5 KiB
Fortran

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 GEN_BLOCK(M,NG,IA,AUX)
use psb_const_mod
use psb_spmat_type
IMPLICIT NONE
INTEGER M, NG
INTEGER IA(3,*), AUX(*)
INTEGER BLOCK, I, N_ROWS
N_ROWS = IA(1,2) - IA(1,1)
I = 2
BLOCK = 2
AUX(1) = 1
DO WHILE(.TRUE.)
IF (N_ROWS.GT.PSB_MAXJDROWS_) THEN
AUX(BLOCK) = AUX(BLOCK-1)+PSB_MAXJDROWS_
N_ROWS = N_ROWS-PSB_MAXJDROWS_
BLOCK = BLOCK+1
ELSE IF (N_ROWS.GT.0) THEN
AUX(BLOCK) = AUX(BLOCK-1)+N_ROWS
N_ROWS = 0
BLOCK = BLOCK+1
ELSE IF (I.LE.NG) THEN
N_ROWS = IA(1,I+1) - IA(1,I)
I = I+1
ELSE
GOTO 998
ENDIF
ENDDO
998 CONTINUE
C ... Copy AUX in IA(1,*)
NG = BLOCK - 2
DO I = 1, NG+1
IA(1,I) = AUX(I)
ENDDO
END