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USE HPF_LIBRARY
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REAL x(nnode), flux(nedge)
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INTEGER iedge(nedge,2)
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INTEGER permute_node(nnode), permute_edge(nedge)
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!HPF$ DISTRIBUTE x(BLOCK)
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!HPF$ DISTRIBUTE flux(BLOCK)
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!HPF$ ALIGN iedge(i,*) WITH flux(i)
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!HPF$ ALIGN permute_edge(i) WITH flux(i)
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!HPF$ ALIGN permute_node(i) WITH x(i)
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CALL renumber_nodes( iedge, permute_node )
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x( permute_node(:) ) = x
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FORALL (i=1:nedge) iedge(i,:) = permute_node(iedge(i,:))
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permute_edge = GRADE_UP( iedge(:,1) )
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FORALL (i=1:nedge) iedge(i,:) = iedge(permute_edge(i),:)
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err = tol * 1e6
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DO WHILE (err > tol)
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flux=(x(iedge(1:nedge,1))-x(iedge(1:nedge,2)))/2
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x=SUM_SCATTER(-flux(1:nedge),x,iedge(1:nedge,1))
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x=SUM_SCATTER( flux(1:nedge),x,iedge(1:nedge,2))
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err = SUM( flux*flux ) / nedge
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END DO
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