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199 lines
5.4 KiB
Fortran
199 lines
5.4 KiB
Fortran
C
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C Parallel Sparse BLAS version 3.1
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C (C) Copyright 2006, 2007, 2008, 2009, 2010
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C Salvatore Filippone University of Rome Tor Vergata
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C Alfredo Buttari CNRS-IRIT, Toulouse
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C
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C Redistribution and use in source and binary forms, with or without
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C modification, are permitted provided that the following conditions
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C are met:
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C 1. Redistributions of source code must retain the above copyright
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C notice, this list of conditions and the following disclaimer.
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C 2. Redistributions in binary form must reproduce the above copyright
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C notice, this list of conditions, and the following disclaimer in the
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C documentation and/or other materials provided with the distribution.
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C 3. The name of the PSBLAS group or the names of its contributors may
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C not be used to endorse or promote products derived from this
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C software without specific written permission.
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C
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C THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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C ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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C TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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C PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE PSBLAS GROUP OR ITS CONTRIBUTORS
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C BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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C CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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C SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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C INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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C CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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C ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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C POSSIBILITY OF SUCH DAMAGE.
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C
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C
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subroutine saxpby(m, n, alpha, X, lldx, beta, Y, lldy, info)
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use psb_const_mod
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integer n, m, lldx, lldy, info
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real(psb_spk_) X(lldx,*), Y(lldy,*)
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real(psb_spk_) alpha, beta
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integer(psb_ipk_) :: i, j
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integer(psb_ipk_) :: int_err(5)
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character name*20
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name='saxpby'
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C
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C Error handling
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C
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info = psb_success_
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if (m.lt.0) then
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info=psb_err_iarg_neg_
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int_err(1)=1
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int_err(2)=m
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call fcpsb_errpush(info,name,int_err)
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goto 9999
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else if (n.lt.0) then
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info=psb_err_iarg_neg_
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int_err(1)=1
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int_err(2)=n
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call fcpsb_errpush(info,name,int_err)
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goto 9999
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else if (lldx.lt.max(1,m)) then
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info=psb_err_iarg_not_gtia_ii_
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int_err(1)=5
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int_err(2)=1
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int_err(3)=lldx
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int_err(4)=m
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call fcpsb_errpush(info,name,int_err)
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goto 9999
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else if (lldy.lt.max(1,m)) then
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info=psb_err_iarg_not_gtia_ii_
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int_err(1)=8
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int_err(2)=1
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int_err(3)=lldy
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int_err(4)=m
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call fcpsb_errpush(info,name,int_err)
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goto 9999
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endif
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if (alpha.eq.szero) then
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if (beta.eq.szero) then
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do j=1, n
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do i=1,m
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y(i,j) = szero
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enddo
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enddo
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else if (beta.eq.sone) then
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c$$$
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c$$$ Do nothing!
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c$$$
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else if (beta.eq.-sone) then
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do j=1,n
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do i=1,m
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y(i,j) = - y(i,j)
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enddo
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enddo
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else
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do j=1,n
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do i=1,m
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y(i,j) = beta*y(i,j)
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enddo
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enddo
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endif
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else if (alpha.eq.sone) then
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if (beta.eq.szero) then
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do j=1,n
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do i=1,m
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y(i,j) = x(i,j)
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enddo
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enddo
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else if (beta.eq.sone) then
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do j=1,n
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do i=1,m
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y(i,j) = x(i,j) + y(i,j)
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enddo
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enddo
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else if (beta.eq.-sone) then
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do j=1,n
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do i=1,m
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y(i,j) = x(i,j) - y(i,j)
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enddo
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enddo
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else
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do j=1,n
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do i=1,m
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y(i,j) = x(i,j) + beta*y(i,j)
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enddo
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enddo
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endif
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else if (alpha.eq.-sone) then
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if (beta.eq.szero) then
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do j=1,n
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do i=1,m
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y(i,j) = -x(i,j)
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enddo
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enddo
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else if (beta.eq.sone) then
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do j=1,n
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do i=1,m
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y(i,j) = -x(i,j) + y(i,j)
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enddo
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enddo
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else if (beta.eq.-sone) then
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do j=1,n
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do i=1,m
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y(i,j) = -x(i,j) - y(i,j)
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enddo
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enddo
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else
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do j=1,n
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do i=1,m
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y(i,j) = -x(i,j) + beta*y(i,j)
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enddo
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enddo
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endif
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else
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if (beta.eq.szero) then
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do j=1,n
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do i=1,m
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y(i,j) = alpha*x(i,j)
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enddo
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enddo
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else if (beta.eq.sone) then
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do j=1,n
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do i=1,m
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y(i,j) = alpha*x(i,j) + y(i,j)
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enddo
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enddo
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else if (beta.eq.-sone) then
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do j=1,n
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do i=1,m
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y(i,j) = alpha*x(i,j) - y(i,j)
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enddo
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enddo
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else
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do j=1,n
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do i=1,m
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y(i,j) = alpha*x(i,j) + beta*y(i,j)
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enddo
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enddo
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endif
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endif
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return
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9999 continue
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call fcpsb_serror()
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return
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end
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