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169 lines
5.8 KiB
Fortran
169 lines
5.8 KiB
Fortran
!
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! Parallel Sparse BLAS version 3.5
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! (C) Copyright 2006-2018
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! Salvatore Filippone
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! Alfredo Buttari
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!
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! Redistribution and use in source and binary forms, with or without
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! modification, are permitted provided that the following conditions
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! are met:
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! 1. Redistributions of source code must retain the above copyright
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! notice, this list of conditions and the following disclaimer.
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! 2. Redistributions in binary form must reproduce the above copyright
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! notice, this list of conditions, and the following disclaimer in the
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! documentation and/or other materials provided with the distribution.
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! 3. The name of the PSBLAS group or the names of its contributors may
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! not be used to endorse or promote products derived from this
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! software without specific written permission.
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!
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! THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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! ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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! TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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! PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE PSBLAS GROUP OR ITS CONTRIBUTORS
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! BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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! CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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! SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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! INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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! CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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! ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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! POSSIBILITY OF SUCH DAMAGE.
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!
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! Moved here from AMG-AINV, original copyright below.
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!
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!
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! AMG-AINV: Approximate Inverse plugin for
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! AMG4PSBLAS version 1.0
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!
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! (C) Copyright 2020
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!
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! Salvatore Filippone University of Rome Tor Vergata
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!
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! Redistribution and use in source and binary forms, with or without
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! modification, are permitted provided that the following conditions
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! are met:
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! 1. Redistributions of source code must retain the above copyright
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! notice, this list of conditions and the following disclaimer.
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! 2. Redistributions in binary form must reproduce the above copyright
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! notice, this list of conditions, and the following disclaimer in the
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! documentation and/or other materials provided with the distribution.
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! 3. The name of the AMG4PSBLAS group or the names of its contributors may
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! not be used to endorse or promote products derived from this
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! software without specific written permission.
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!
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! THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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! ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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! TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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! PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
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! BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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! CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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! SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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! INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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! CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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! ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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! POSSIBILITY OF SUCH DAMAGE.
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!
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!
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subroutine psb_d_sp_drop(idiag,nzrmax,sp_thresh,nz,iz,valz,info)
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use psb_base_mod
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implicit none
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real(psb_dpk_), intent(in) :: sp_thresh
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integer(psb_ipk_), intent(in) :: idiag, nzrmax
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integer(psb_ipk_), intent(inout) :: nz
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integer(psb_ipk_), intent(inout) :: iz(:)
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real(psb_dpk_), intent(inout) :: valz(:)
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integer(psb_ipk_), intent(out) :: info
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!
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integer(psb_ipk_) :: i, j, idf, nw
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real(psb_dpk_) :: witem
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integer(psb_ipk_) :: widx
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real(psb_dpk_), allocatable :: xw(:)
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integer(psb_ipk_), allocatable :: xwid(:), indx(:)
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info = psb_success_
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if (nz > min(size(iz),size(valz))) then
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write(0,*) 'Serious size problem ',nz,size(iz),size(valz)
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info = -2
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return
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end if
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allocate(xw(nz),xwid(nz),indx(nz),stat=info)
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if (info /= psb_success_) then
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write(psb_err_unit,*) ' Memory allocation failure in sp_drop',nz,info
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return
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endif
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! Always keep the diagonal element
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idf = -1
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do i=1, nz
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if (iz(i) == idiag) then
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idf = i
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witem = valz(i)
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widx = iz(i)
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valz(i) = valz(1)
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iz(i) = iz(1)
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valz(1) = witem
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iz(1) = widx
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exit
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end if
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end do
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if (idf == -1) then
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xw(1:nz) = valz(1:nz)
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call psb_qsort(xw(1:nz),indx(1:nz),dir=psb_asort_down_)
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do i=1, nz
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xwid(i) = iz(indx(i))
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end do
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nw = min(nz,nzrmax)
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do
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if (nw <= 1) exit
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if (abs(xw(nw)) < sp_thresh) then
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nw = nw - 1
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else
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exit
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end if
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end do
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nw = max(nw, 1)
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else
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nw = nz-1
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xw(1:nw) = valz(2:nz)
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call psb_qsort(xw(1:nw),indx(1:nw),dir=psb_asort_down_)
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nw = min(nw,nzrmax-1)
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do
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if (nw <= 1) exit
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if (abs(xw(nw)) < sp_thresh) then
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nw = nw - 1
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else
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exit
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end if
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end do
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do i=1, nw
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xwid(i) = iz(1+indx(i))
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end do
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nw = nw + 1
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xw(nw) = valz(1)
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xwid(nw) = iz(1)
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end if
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call psb_msort(xwid(1:nw),indx(1:nw),dir=psb_sort_up_)
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do i=1, nw
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valz(i) = xw(indx(i))
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iz(i) = xwid(i)
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end do
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nz = nw
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if (nz>nzrmax) write(0,*) 'in sp_drop: ',nw,nzrmax,nz
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deallocate(xw,xwid,indx,stat=info)
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if (info /= psb_success_) then
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write(psb_err_unit,*) ' Memory deallocation failure in sp_drop',info
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return
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endif
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return
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end subroutine psb_d_sp_drop
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