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!!$
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!!$ Parallel Sparse BLAS version 2.2
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!!$ (C) Copyright 2006/2007/2008
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!!$ Salvatore Filippone University of Rome Tor Vergata
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!!$ Alfredo Buttari University of Rome Tor Vergata
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!!$
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!!$ Redistribution and use in source and binary forms, with or without
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!!$ modification, are permitted provided that the following conditions
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!!$ are met:
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!!$ 1. Redistributions of source code must retain the above copyright
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!!$ notice, this list of conditions and the following disclaimer.
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!!$ 2. Redistributions in binary form must reproduce the above copyright
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!!$ notice, this list of conditions, and the following disclaimer in the
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!!$ documentation and/or other materials provided with the distribution.
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!!$ 3. The name of the PSBLAS group or the names of its contributors may
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!!$ not be used to endorse or promote products derived from this
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!!$ software without specific written permission.
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!!$
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!!$ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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!!$ ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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!!$ TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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!!$ PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE PSBLAS GROUP OR ITS CONTRIBUTORS
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!!$ BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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!!$ CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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!!$ SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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!!$ INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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!!$ CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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!!$ ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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!!$ POSSIBILITY OF SUCH DAMAGE.
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!!$
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!!$
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! File: psb_dsymbmm.f90
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! Subroutine:
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! Arguments:
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!
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!
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! Note: This subroutine performs the symbolic product of two sparse matrices.
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! It is modeled after the SMMP package by R. Bank and C. Douglas, but is
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! rewritten in Fortran 95 making use of our sparse matrix facilities.
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!
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subroutine psb_dsymbmm(a,b,c,info)
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use psb_spmat_type
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use psb_string_mod
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use psb_serial_mod, psb_protect_name => psb_dsymbmm
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implicit none
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type(psb_dspmat_type) :: a,b,c
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integer, allocatable :: itemp(:)
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integer :: nze,info
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interface
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subroutine symbmm (n, m, l, ia, ja, diaga, &
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& ib, jb, diagb, ic, jc, diagc, index)
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integer n,m,l, ia(*), ja(*), diaga, ib(*), jb(*), diagb,&
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& diagc, index(*)
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integer, allocatable :: ic(:),jc(:)
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end subroutine symbmm
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end interface
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character(len=20) :: name
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integer :: err_act
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logical :: csra, csrb
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name='psb_symbmm'
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call psb_erractionsave(err_act)
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csra = (toupper(a%fida(1:3))=='CSR')
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csrb = (toupper(b%fida(1:3))=='CSR')
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if (b%m /= a%k) then
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write(0,*) 'Mismatch in SYMBMM: ',a%m,a%k,b%m,b%k
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endif
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allocate(itemp(max(a%m,a%k,b%m,b%k)),stat=info)
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if (info /= 0) then
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return
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endif
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nze = max(a%m+1,2*a%m)
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call psb_sp_reall(c,nze,info)
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!
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! Note: we need to test whether there is a performance impact
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! in not using the original Douglas & Bank code.
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!
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if (csra.and.csrb) then
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call symbmm(a%m,a%k,b%k,a%ia2,a%ia1,0,&
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& b%ia2,b%ia1,0,&
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& c%ia2,c%ia1,0,itemp)
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else
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call inner_symbmm(a,b,c,itemp,info)
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endif
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call psb_realloc(size(c%ia1),c%aspk,info)
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c%pl(1) = 0
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c%pr(1) = 0
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c%m=a%m
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c%k=b%k
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c%fida='CSR'
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c%descra='GUN'
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deallocate(itemp)
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call psb_erractionrestore(err_act)
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return
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9999 continue
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call psb_erractionrestore(err_act)
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if (err_act == psb_act_abort_) then
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call psb_error()
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return
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end if
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return
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contains
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subroutine inner_symbmm(a,b,c,index,info)
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type(psb_dspmat_type) :: a,b,c
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integer :: index(:),info
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integer, allocatable :: iarw(:), iacl(:),ibrw(:),ibcl(:)
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real(psb_dpk_), allocatable :: aval(:),bval(:)
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integer :: maxlmn,i,j,m,n,k,l,istart,length,nazr,nbzr,jj,minlm,minmn
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n = a%m
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m = a%k
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l = b%k
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maxlmn = max(l,m,n)
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allocate(iarw(maxlmn),iacl(maxlmn),ibrw(maxlmn),ibcl(maxlmn),&
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& aval(maxlmn),bval(maxlmn), stat=info)
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if (info /= 0) then
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return
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endif
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if (size(c%ia2) < n+1) then
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call psb_realloc(n+1,c%ia2,info)
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endif
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do i=1,maxlmn
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index(i)=0
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end do
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c%ia2(1)=1
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minlm = min(l,m)
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minmn = min(m,n)
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main: do i=1,n
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istart=-1
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length=0
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call psb_sp_getrow(i,a,nazr,iarw,iacl,aval,info)
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do jj=1, nazr
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j=iacl(jj)
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if ((j<1).or.(j>m)) then
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write(0,*) ' SymbMM: Problem with A ',i,jj,j,m
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info = 1
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return
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endif
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call psb_sp_getrow(j,b,nbzr,ibrw,ibcl,bval,info)
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do k=1,nbzr
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if ((ibcl(k)<1).or.(ibcl(k)>maxlmn)) then
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write(0,*) 'Problem in SYMBMM 1:',j,k,ibcl(k),maxlmn
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info=2
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return
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else
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if(index(ibcl(k)) == 0) then
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index(ibcl(k))=istart
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istart=ibcl(k)
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length=length+1
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endif
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endif
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end do
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end do
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c%ia2(i+1)=c%ia2(i)+length
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if (c%ia2(i+1) > size(c%ia1)) then
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if (n > (2*i)) then
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nze = max(c%ia2(i+1), c%ia2(i)*((n+i-1)/i))
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else
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nze = max(c%ia2(i+1), nint((dble(c%ia2(i))*(dble(n)/i))) )
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endif
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call psb_realloc(nze,c%ia1,info)
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end if
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do j= c%ia2(i),c%ia2(i+1)-1
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c%ia1(j)=istart
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istart=index(istart)
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index(c%ia1(j))=0
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end do
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call psb_msort(c%ia1(c%ia2(i):c%ia2(i)+length-1))
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index(i) = 0
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end do main
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end subroutine inner_symbmm
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end subroutine psb_dsymbmm
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