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psblas3/base/serial/aux/imsrx.f90

101 lines
3.0 KiB
Fortran

!!$
!!$ Parallel Sparse BLAS v2.0
!!$ (C) Copyright 2006 Salvatore Filippone University of Rome Tor Vergata
!!$ Alfredo Buttari University of Rome Tor Vergata
!!$
!!$ Redistribution and use in source and binary forms, with or without
!!$ modification, are permitted provided that the following conditions
!!$ are met:
!!$ 1. Redistributions of source code must retain the above copyright
!!$ notice, this list of conditions and the following disclaimer.
!!$ 2. Redistributions in binary form must reproduce the above copyright
!!$ notice, this list of conditions, and the following disclaimer in the
!!$ documentation and/or other materials provided with the distribution.
!!$ 3. The name of the PSBLAS group or the names of its contributors may
!!$ not be used to endorse or promote products derived from this
!!$ software without specific written permission.
!!$
!!$ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
!!$ ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
!!$ TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
!!$ PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE PSBLAS GROUP OR ITS CONTRIBUTORS
!!$ BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
!!$ CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
!!$ SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
!!$ INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
!!$ CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
!!$ ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
!!$ POSSIBILITY OF SUCH DAMAGE.
!!$
!!$
! File: imsrx.f90
! Subroutine:
! Parameters:
subroutine imsrx(n,x,indx,idir,flag)
use psb_serial_mod
integer :: n,idir,flag
integer :: x(n)
integer :: indx(n)
integer, allocatable :: iaux(:)
integer :: iswap, iret, info, lp, k
integer :: lswap, ixswap
if (n<0) then
write(0,*) 'Error: IMSRX: N<0'
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/=0) then
write(0,*) 'IMSRX: memory allocation failed',info
return
endif
if (idir == psb_sort_up_) then
call msort_up(n,x,iaux,iret)
else
call msort_dw(n,x,iaux,iret)
end if
if (iret /= 1) then
lp = iaux(0)
k = 1
do
if ((lp==0).or.(k>n)) exit
do
if (lp >= k) exit
lp = iaux(lp)
end do
iswap = x(lp)
x(lp) = x(k)
x(k) = iswap
ixswap = indx(lp)
indx(lp) = indx(k)
indx(k) = ixswap
lswap = iaux(lp)
iaux(lp) = iaux(k)
iaux(k) = lp
lp = lswap
k = k + 1
enddo
end if
deallocate(iaux,stat=info)
if (info/=0) then
write(0,*) 'IMSRX: memory deallocation failed',info
endif
return
end subroutine imsrx