1! 2! 3! Fortran kernel for sparse matrix-vector product in the AIJ/CRL format 4! 5#include <petsc/finclude/petscsys.h> 6! 7pure subroutine FortranMultCRL(m,rmax,x,y,icols,acols) 8 use, intrinsic :: ISO_C_binding 9 implicit none (type, external) 10 PetscInt, intent(in) :: m,rmax,icols(m,rmax) 11 PetscScalar, intent(in) :: x(0:m-1), acols(m,rmax) 12 PetscScalar, intent(out) :: y(m) 13 14 PetscInt :: i 15 16 y(1:m) = acols(1:m,1)*x(icols(1:m,1)) 17 do i=2,rmax 18 y(1:m) = y(1:m) + acols(1:m,i)*x(icols(1:m,i)) 19 end do 20end subroutine FortranMultCRL 21