psblas3/base/serial/aux/imsrx.f90

!!$ 
!!$              Parallel Sparse BLAS  version 3.1
!!$    (C) Copyright 2006, 2007, 2008, 2009, 2010, 2012, 2013
!!$                       Salvatore Filippone    University of Rome Tor Vergata
!!$                       Alfredo Buttari        CNRS-IRIT, Toulouse
!!$ 
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! File:  imsrx.f90 
 ! Subroutine: 
 ! Parameters:
subroutine imsrx(n,x,indx,idir,flag)
  use psb_serial_mod
  use psb_ip_reord_mod
  implicit none
  integer(psb_ipk_) :: n,idir,flag
  integer(psb_ipk_) :: x(n)
  integer(psb_ipk_) :: indx(n)

  integer(psb_ipk_), allocatable :: iaux(:)

  integer(psb_ipk_) :: iswap, iret, info, lp, k
  integer(psb_ipk_) :: lswap, ixswap

  if (n<0) then 
    return
  endif

  if (n == 0) return

  if (flag == psb_sort_ovw_idx_) then 
    do k=1,n
      indx(k) = k
    enddo
  end if

  if (n == 1) return

  allocate(iaux(0:n+1),stat=info)
  if (info /= psb_success_) then 
    call psb_errpush(psb_err_alloc_dealloc_,r_name='imsrx')
    call psb_error()
  endif

  
  select case(idir)
  case (psb_sort_up_)
    call msort_up(n,x,iaux,iret)
  case (psb_asort_up_)
    call iamsort_up(n,x,iaux,iret)
  case (psb_asort_down_)
    call iamsort_dw(n,x,iaux,iret)
  case (psb_sort_down_)
    call msort_dw(n,x,iaux,iret)
  end select
  
  if (iret == 0) call psb_ip_reord(n,x,indx,iaux)

  deallocate(iaux,stat=info)
  if (info /= psb_success_) then 
    call psb_errpush(psb_err_alloc_dealloc_,r_name='imsrx')
    call psb_error()
  endif
  return
end subroutine imsrx