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psblas3/base/serial/f77/saxpby.f

199 lines
5.4 KiB
Fortran

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