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c == =====================================================================
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c Sparse Matrix Multiplication Package
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c
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c Randolph E. Bank and Craig C. Douglas
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c
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c na.bank@na-net.ornl.gov and na.cdouglas@na-net.ornl.gov
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c
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c Compile this with the following command (or a similar one):
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c
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c f77 -c -O smmp.f
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c
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c == =====================================================================
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subroutine symbmm
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* (n, m, l,
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* ia, ja, diaga,
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* ib, jb, diagb,
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* ic, jc, diagc,
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* index)
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use psb_const_mod
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use psb_realloc_mod
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use psb_sort_mod, only: psb_msort
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c
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integer(psb_ipk_) :: ia(*), ja(*), diaga,
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* ib(*), jb(*), diagb, diagc, index(*)
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integer(psb_ipk_), allocatable :: ic(:),jc(:)
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integer(psb_ipk_) :: nze, info
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c
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c symbolic matrix multiply c=a*b
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c
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if (size(ic) < n+1) then
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write(psb_err_unit,*)
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+ 'Called realloc in SYMBMM '
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call psb_realloc(n+1,ic,info)
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if (info /= psb_success_) then
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write(psb_err_unit,*)
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+ 'realloc failed in SYMBMM ',info
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end if
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endif
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maxlmn = max(l,m,n)
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do 10 i=1,maxlmn
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index(i)=0
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10 continue
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if (diagc.eq.0) then
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ic(1)=1
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else
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ic(1)=n+2
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endif
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minlm = min(l,m)
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minmn = min(m,n)
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c
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c main loop
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c
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do 50 i=1,n
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istart=-1
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length=0
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c
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c merge row lists
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c
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do 30 jj=ia(i),ia(i+1)
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c a = d + ...
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if (jj.eq.ia(i+1)) then
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if (diaga.eq.0 .or. i.gt.minmn) goto 30
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j = i
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else
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j=ja(jj)
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endif
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c b = d + ...
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if (index(j).eq.0 .and. diagb.eq.1 .and. j.le.minlm)then
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index(j)=istart
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istart=j
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length=length+1
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endif
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if ((j<1).or.(j>m)) then
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write(psb_err_unit,*)
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+ ' SymbMM: Problem with A ',i,jj,j,m
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endif
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do 20 k=ib(j),ib(j+1)-1
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if ((jb(k)<1).or.(jb(k)>maxlmn)) then
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write(psb_err_unit,*)
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+ 'Problem in SYMBMM 1:',j,k,jb(k),maxlmn
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else
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if(index(jb(k)).eq.0) then
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index(jb(k))=istart
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istart=jb(k)
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length=length+1
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endif
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endif
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20 continue
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30 continue
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c
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c row i of jc
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c
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if (diagc.eq.1 .and. index(i).ne.0) length = length - 1
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ic(i+1)=ic(i)+length
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if (ic(i+1) > size(jc)) then
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if (n > (2*i)) then
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nze = max(ic(i+1), ic(i)*((n+i-1)/i))
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else
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nze = max(ic(i+1), nint((dble(ic(i))*(dble(n)/i))) )
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endif
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call psb_realloc(nze,jc,info)
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end if
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do 40 j= ic(i),ic(i+1)-1
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if (diagc.eq.1 .and. istart.eq.i) then
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istart = index(istart)
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index(i) = 0
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endif
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jc(j)=istart
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istart=index(istart)
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index(jc(j))=0
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40 continue
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call psb_msort(jc(ic(i):ic(i)+length -1))
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index(i) = 0
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50 continue
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return
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end
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