!!$ 
!!$              Parallel Sparse BLAS  version 2.2
!!$    (C) Copyright 2006/2007/2008
!!$                       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.
!!$ 
!!$  
module psi_serial_mod


  interface psi_gth
    module procedure &
         & psi_igthv,  psi_sgthv,  psi_cgthv, psi_dgthv,  psi_zgthv,&
         & psi_igthzv, psi_sgthzv, psi_cgthzv, psi_dgthzv, psi_zgthzv,&
         & psi_igthzmv, psi_sgthzmv, psi_cgthzmv, psi_dgthzmv, psi_zgthzmv 
  end interface

  interface psi_sct
    module procedure psi_isctmv, psi_isctv,&
         & psi_ssctmv, psi_ssctv,&
         & psi_csctmv, psi_csctv,&
         & psi_dsctmv, psi_dsctv,&
         & psi_zsctmv, psi_zsctv
  end interface

  interface psb_geaxpby
    module procedure psi_saxpbyv, psi_saxpby, &
         & psi_daxpbyv, psi_daxpby, &
         & psi_caxpbyv, psi_caxpby, &
         & psi_zaxpbyv, psi_zaxpby
  end interface


  interface psb_gelp
    ! 2-D version
    subroutine psb_sgelp(trans,iperm,x,info)
      use psb_const_mod
      real(psb_spk_), intent(inout)      ::  x(:,:)
      integer, intent(in)                  ::  iperm(:)
      integer, intent(out)                 ::  info
      character, intent(in)                :: trans
    end subroutine psb_sgelp
    ! 1-D version
    subroutine psb_sgelpv(trans,iperm,x,info)
      use psb_const_mod
      real(psb_spk_), intent(inout)    ::  x(:)
      integer, intent(in)                  ::  iperm(:)
      integer, intent(out)                 ::  info
      character, intent(in)              :: trans
    end subroutine psb_sgelpv
    subroutine psb_dgelp(trans,iperm,x,info)
      use psb_const_mod
      real(psb_dpk_), intent(inout)      ::  x(:,:)
      integer, intent(in)                  ::  iperm(:)
      integer, intent(out)                 ::  info
      character, intent(in)                :: trans
    end subroutine psb_dgelp
    ! 1-D version
    subroutine psb_dgelpv(trans,iperm,x,info)
      use psb_const_mod
      real(psb_dpk_), intent(inout)    ::  x(:)
      integer, intent(in)                  ::  iperm(:)
      integer, intent(out)                 ::  info
      character, intent(in)              :: trans
    end subroutine psb_dgelpv
    ! 2-D version
    subroutine psb_cgelp(trans,iperm,x,info)
      use psb_const_mod
      complex(psb_spk_), intent(inout)      ::  x(:,:)
      integer, intent(in)                  ::  iperm(:)
      integer, intent(out)                 ::  info
      character, intent(in)                :: trans
    end subroutine psb_cgelp
    ! 1-D version
    subroutine psb_cgelpv(trans,iperm,x,info)
      use psb_const_mod
      complex(psb_spk_), intent(inout)    ::  x(:)
      integer, intent(in)                  ::  iperm(:)
      integer, intent(out)                 ::  info
      character, intent(in)              :: trans
    end subroutine psb_cgelpv
    ! 2-D version
    subroutine psb_zgelp(trans,iperm,x,info)
      use psb_const_mod
      complex(psb_dpk_), intent(inout)      ::  x(:,:)
      integer, intent(in)                  ::  iperm(:)
      integer, intent(out)                 ::  info
      character, intent(in)                :: trans
    end subroutine psb_zgelp
    ! 1-D version
    subroutine psb_zgelpv(trans,iperm,x,info)
      use psb_const_mod
      complex(psb_dpk_), intent(inout)    ::  x(:)
      integer, intent(in)                  ::  iperm(:)
      integer, intent(out)                 ::  info
      character, intent(in)              :: trans
    end subroutine psb_zgelpv
  end interface


contains


  subroutine psi_igthv(n,idx,alpha,x,beta,y)

    use psb_const_mod
    implicit none

    integer :: n, idx(:)
    integer :: x(:), y(:), alpha, beta

    ! Locals
    integer :: i
    if (beta == izero) then 
      if (alpha == izero) then 
        do i=1,n
          y(i) = izero
        end do
      else if (alpha == ione) then 
        do i=1,n
          y(i) = x(idx(i))
        end do
      else if (alpha == -ione) then 
        do i=1,n
          y(i) = -x(idx(i))
        end do
      else  
        do i=1,n
          y(i) = alpha*x(idx(i))
        end do
      end if
    else 
      if (beta == ione) then 
        ! Do nothing
      else if (beta == -ione) then 
        y(1:n) = -y(1:n) 
      else
        y(1:n) = beta*y(1:n) 
      end if

      if (alpha == izero) then 
        ! do nothing
      else if (alpha == ione) then 
        do i=1,n
          y(i) = y(i) + x(idx(i))
        end do
      else if (alpha == -ione) then 
        do i=1,n
          y(i) = y(i) - x(idx(i))
        end do
      else  
        do i=1,n
          y(i) = y(i) + alpha*x(idx(i))
        end do
      end if
    end if

  end subroutine psi_igthv

  subroutine psi_sgthv(n,idx,alpha,x,beta,y)

    use psb_const_mod
    implicit none

    integer :: n, idx(:)
    real(psb_spk_) :: x(:), y(:), alpha, beta

    ! Locals
    integer :: i
    if (beta == szero) then 
      if (alpha == szero) then 
        do i=1,n
          y(i) = szero
        end do
      else if (alpha == sone) then 
        do i=1,n
          y(i) = x(idx(i))
        end do
      else if (alpha == -sone) then 
        do i=1,n
          y(i) = -x(idx(i))
        end do
      else 
        do i=1,n
          y(i) = alpha*x(idx(i))
        end do
      end if
    else 
      if (beta == sone) then 
        ! Do nothing
      else if (beta == -sone) then 
        y(1:n) = -y(1:n) 
      else
        y(1:n) = beta*y(1:n) 
      end if

      if (alpha == szero) then 
        ! do nothing
      else if (alpha == sone) then 
        do i=1,n
          y(i) = y(i) + x(idx(i))
        end do
      else if (alpha == -sone) then 
        do i=1,n
          y(i) = y(i) - x(idx(i))
        end do
      else  
        do i=1,n
          y(i) = y(i) + alpha*x(idx(i))
        end do
      end if
    end if

  end subroutine psi_sgthv

  subroutine psi_dgthv(n,idx,alpha,x,beta,y)

    use psb_const_mod
    implicit none

    integer :: n, idx(:)
    real(psb_dpk_) :: x(:), y(:), alpha, beta

    ! Locals
    integer :: i
    if (beta == dzero) then 
      if (alpha == dzero) then 
        do i=1,n
          y(i) = dzero
        end do
      else if (alpha == done) then 
        do i=1,n
          y(i) = x(idx(i))
        end do
      else if (alpha == -done) then 
        do i=1,n
          y(i) = -x(idx(i))
        end do
      else 
        do i=1,n
          y(i) = alpha*x(idx(i))
        end do
      end if
    else 
      if (beta == done) then 
        ! Do nothing
      else if (beta == -done) then 
        y(1:n) = -y(1:n) 
      else
        y(1:n) = beta*y(1:n) 
      end if

      if (alpha == dzero) then 
        ! do nothing
      else if (alpha == done) then 
        do i=1,n
          y(i) = y(i) + x(idx(i))
        end do
      else if (alpha == -done) then 
        do i=1,n
          y(i) = y(i) - x(idx(i))
        end do
      else  
        do i=1,n
          y(i) = y(i) + alpha*x(idx(i))
        end do
      end if
    end if

  end subroutine psi_dgthv

  subroutine psi_cgthv(n,idx,alpha,x,beta,y)

    use psb_const_mod
    implicit none

    integer :: n, idx(:)
    complex(psb_spk_) :: x(:), y(:),alpha,beta

    ! Locals
    integer :: i
    if (beta == czero) then 
      if (alpha == czero) then 
        do i=1,n
          y(i) = czero
        end do
      else if (alpha == cone) then 
        do i=1,n
          y(i) = x(idx(i))
        end do
      else if (alpha == -cone) then 
        do i=1,n
          y(i) = -x(idx(i))
        end do
      else  
        do i=1,n
          y(i) = alpha*x(idx(i))
        end do
      end if
    else 
      if (beta == cone) then 
        ! Do nothing
      else if (beta == -cone) then 
        y(1:n) = -y(1:n) 
      else
        y(1:n) = beta*y(1:n) 
      end if

      if (alpha == czero) then 
        ! do nothing
      else if (alpha == cone) then 
        do i=1,n
          y(i) = y(i) + x(idx(i))
        end do
      else if (alpha == -cone) then 
        do i=1,n
          y(i) = y(i) - x(idx(i))
        end do
      else  
        do i=1,n
          y(i) = y(i) + alpha*x(idx(i))
        end do
      end if
    end if

  end subroutine psi_cgthv

  subroutine psi_zgthv(n,idx,alpha,x,beta,y)

    use psb_const_mod
    implicit none

    integer :: n, idx(:)
    complex(psb_dpk_) :: x(:), y(:),alpha,beta

    ! Locals
    integer :: i
    if (beta == zzero) then 
      if (alpha == zzero) then 
        do i=1,n
          y(i) = zzero
        end do
      else if (alpha == zone) then 
        do i=1,n
          y(i) = x(idx(i))
        end do
      else if (alpha == -zone) then 
        do i=1,n
          y(i) = -x(idx(i))
        end do
      else  
        do i=1,n
          y(i) = alpha*x(idx(i))
        end do
      end if
    else 
      if (beta == zone) then 
        ! Do nothing
      else if (beta == -zone) then 
        y(1:n) = -y(1:n) 
      else
        y(1:n) = beta*y(1:n) 
      end if

      if (alpha == zzero) then 
        ! do nothing
      else if (alpha == zone) then 
        do i=1,n
          y(i) = y(i) + x(idx(i))
        end do
      else if (alpha == -zone) then 
        do i=1,n
          y(i) = y(i) - x(idx(i))
        end do
      else  
        do i=1,n
          y(i) = y(i) + alpha*x(idx(i))
        end do
      end if
    end if

  end subroutine psi_zgthv



  subroutine psi_sgthzmv(n,k,idx,x,y)

    use psb_const_mod
    implicit none

    integer :: n, k, idx(:)
    real(psb_spk_) :: x(:,:), y(:)

    ! Locals
    integer :: i, j, pt

    pt=0
    do j=1,k
      do i=1,n
        pt=pt+1
        y(pt)=x(idx(i),j)
      end do
    end do

  end subroutine psi_sgthzmv

  subroutine psi_dgthzmv(n,k,idx,x,y)

    use psb_const_mod
    implicit none

    integer :: n, k, idx(:)
    real(psb_dpk_) :: x(:,:), y(:)

    ! Locals
    integer :: i, j, pt

    pt=0
    do j=1,k
      do i=1,n
        pt=pt+1
        y(pt)=x(idx(i),j)
      end do
    end do

  end subroutine psi_dgthzmv


  subroutine psi_igthzmv(n,k,idx,x,y)

    use psb_const_mod
    implicit none

    integer :: n, k, idx(:)
    integer :: x(:,:), y(:)

    ! Locals
    integer :: i, j, pt

    pt=0
    do j=1,k
      do i=1,n
        pt=pt+1
        y(pt)=x(idx(i),j)
      end do
    end do

  end subroutine psi_igthzmv


  subroutine psi_cgthzmv(n,k,idx,x,y)

    use psb_const_mod
    implicit none

    integer :: n, k, idx(:)
    complex(psb_spk_) :: x(:,:), y(:)

    ! Locals
    integer :: i, j, pt

    pt=0
    do j=1,k
      do i=1,n
        pt=pt+1
        y(pt)=x(idx(i),j)
      end do
    end do

  end subroutine psi_cgthzmv

  subroutine psi_zgthzmv(n,k,idx,x,y)

    use psb_const_mod
    implicit none

    integer :: n, k, idx(:)
    complex(psb_dpk_) :: x(:,:), y(:)

    ! Locals
    integer :: i, j, pt

    pt=0
    do j=1,k
      do i=1,n
        pt=pt+1
        y(pt)=x(idx(i),j)
      end do
    end do

  end subroutine psi_zgthzmv

  subroutine psi_sgthzv(n,idx,x,y)

    use psb_const_mod
    implicit none

    integer :: n, idx(:)
    real(psb_spk_) :: x(:), y(:)

    ! Locals
    integer :: i

    do i=1,n
      y(i)=x(idx(i))
    end do

  end subroutine psi_sgthzv

  subroutine psi_dgthzv(n,idx,x,y)

    use psb_const_mod
    implicit none

    integer :: n, idx(:)
    real(psb_dpk_) :: x(:), y(:)

    ! Locals
    integer :: i

    do i=1,n
      y(i)=x(idx(i))
    end do

  end subroutine psi_dgthzv

  subroutine psi_igthzv(n,idx,x,y)

    use psb_const_mod
    implicit none

    integer :: n, idx(:)
    integer :: x(:), y(:)

    ! Locals
    integer :: i

    do i=1,n
      y(i)=x(idx(i))
    end do

  end subroutine psi_igthzv

  subroutine psi_cgthzv(n,idx,x,y)

    use psb_const_mod
    implicit none

    integer :: n, idx(:)
    complex(psb_spk_) :: x(:), y(:)

    ! Locals
    integer :: i

    do i=1,n
      y(i)=x(idx(i))
    end do

  end subroutine psi_cgthzv

  subroutine psi_zgthzv(n,idx,x,y)

    use psb_const_mod
    implicit none

    integer :: n, idx(:)
    complex(psb_dpk_) :: x(:), y(:)

    ! Locals
    integer :: i

    do i=1,n
      y(i)=x(idx(i))
    end do

  end subroutine psi_zgthzv


  subroutine psi_ssctmv(n,k,idx,x,beta,y)

    use psb_const_mod
    implicit none

    integer :: n, k, idx(:)
    real(psb_spk_) :: beta, x(:), y(:,:)

    ! Locals
    integer :: i, j, pt

    if (beta == szero) then
      pt=0
      do j=1,k
        do i=1,n
          pt=pt+1
          y(idx(i),j) = x(pt)
        end do
      end do
    else if (beta == sone) then
      pt=0
      do j=1,k
        do i=1,n
          pt=pt+1
          y(idx(i),j) = y(idx(i),j)+x(pt)
        end do
      end do
    else
      pt=0
      do j=1,k
        do i=1,n
          pt=pt+1
          y(idx(i),j) = beta*y(idx(i),j)+x(pt)
        end do
      end do
    end if
  end subroutine psi_ssctmv

  subroutine psi_ssctv(n,idx,x,beta,y)

    use psb_const_mod
    implicit none

    integer :: n, idx(:)
    real(psb_spk_) :: beta, x(:), y(:)

    ! Locals
    integer :: i

    if (beta == szero) then
      do i=1,n
        y(idx(i)) = x(i)
      end do
    else if (beta == sone) then
      do i=1,n
        y(idx(i)) = y(idx(i))+x(i)
      end do
    else
      do i=1,n
        y(idx(i)) = beta*y(idx(i))
      end do
      do i=1,n
        y(idx(i)) = y(idx(i))+x(i)
      end do
    end if
  end subroutine psi_ssctv


  subroutine psi_dsctmv(n,k,idx,x,beta,y)

    use psb_const_mod
    implicit none

    integer :: n, k, idx(:)
    real(psb_dpk_) :: beta, x(:), y(:,:)

    ! Locals
    integer :: i, j, pt

    if (beta == dzero) then
      pt=0
      do j=1,k
        do i=1,n
          pt=pt+1
          y(idx(i),j) = x(pt)
        end do
      end do
    else if (beta == done) then
      pt=0
      do j=1,k
        do i=1,n
          pt=pt+1
          y(idx(i),j) = y(idx(i),j)+x(pt)
        end do
      end do
    else
      pt=0
      do j=1,k
        do i=1,n
          pt=pt+1
          y(idx(i),j) = beta*y(idx(i),j)+x(pt)
        end do
      end do
    end if
  end subroutine psi_dsctmv

  subroutine psi_dsctv(n,idx,x,beta,y)

    use psb_const_mod
    implicit none

    integer :: n, idx(:)
    real(psb_dpk_) :: beta, x(:), y(:)

    ! Locals
    integer :: i

    if (beta == dzero) then
      do i=1,n
        y(idx(i)) = x(i)
      end do
    else if (beta == done) then
      do i=1,n
        y(idx(i)) = y(idx(i))+x(i)
      end do
    else
      do i=1,n
        y(idx(i)) = beta*y(idx(i))
      end do
      do i=1,n
        y(idx(i)) = y(idx(i))+x(i)
      end do
    end if
  end subroutine psi_dsctv

  subroutine psi_isctmv(n,k,idx,x,beta,y)

    use psb_const_mod
    implicit none

    integer :: n, k, idx(:)
    integer :: beta, x(:), y(:,:)

    ! Locals
    integer :: i, j, pt

    if (beta == izero) then
      pt=0
      do j=1,k
        do i=1,n
          pt=pt+1
          y(idx(i),j) = x(pt)
        end do
      end do
    else if (beta == ione) then
      pt=0
      do j=1,k
        do i=1,n
          pt=pt+1
          y(idx(i),j) = y(idx(i),j)+x(pt)
        end do
      end do
    else
      pt=0
      do j=1,k
        do i=1,n
          pt=pt+1
          y(idx(i),j) = beta*y(idx(i),j)+x(pt)
        end do
      end do
    end if
  end subroutine psi_isctmv

  subroutine psi_isctv(n,idx,x,beta,y)

    use psb_const_mod
    implicit none

    integer :: n, idx(:)
    integer :: beta, x(:), y(:)

    ! Locals
    integer :: i

    if (beta == izero) then
      do i=1,n
        y(idx(i)) = x(i)
      end do
    else if (beta == ione) then
      do i=1,n
        y(idx(i)) = y(idx(i))+x(i)
      end do
    else
      do i=1,n
        y(idx(i)) = beta*y(idx(i))+x(i)
      end do
    end if
  end subroutine psi_isctv

  subroutine psi_csctmv(n,k,idx,x,beta,y)

    use psb_const_mod
    implicit none

    integer :: n, k, idx(:)
    complex(psb_spk_) :: beta, x(:), y(:,:)

    ! Locals
    integer :: i, j, pt

    if (beta == czero) then
      pt=0
      do j=1,k
        do i=1,n
          pt=pt+1
          y(idx(i),j) = x(pt)
        end do
      end do
    else if (beta == cone) then
      pt=0
      do j=1,k
        do i=1,n
          pt=pt+1
          y(idx(i),j) = y(idx(i),j)+x(pt)
        end do
      end do
    else
      pt=0
      do j=1,k
        do i=1,n
          pt=pt+1
          y(idx(i),j) = beta*y(idx(i),j)+x(pt)
        end do
      end do
    end if
  end subroutine psi_csctmv


  subroutine psi_csctv(n,idx,x,beta,y)

    use psb_const_mod
    implicit none

    integer :: n, idx(:)
    complex(psb_spk_) :: beta, x(:), y(:)

    ! Locals
    integer :: i

    if (beta == czero) then
      do i=1,n
        y(idx(i)) = x(i)
      end do
    else if (beta == cone) then
      do i=1,n
        y(idx(i)) = y(idx(i))+x(i)
      end do
    else
      do i=1,n
        y(idx(i)) = beta*y(idx(i))+x(i)
      end do
    end if
  end subroutine psi_csctv

  subroutine psi_zsctmv(n,k,idx,x,beta,y)

    use psb_const_mod
    implicit none

    integer :: n, k, idx(:)
    complex(psb_dpk_) :: beta, x(:), y(:,:)

    ! Locals
    integer :: i, j, pt

    if (beta == zzero) then
      pt=0
      do j=1,k
        do i=1,n
          pt=pt+1
          y(idx(i),j) = x(pt)
        end do
      end do
    else if (beta == zone) then
      pt=0
      do j=1,k
        do i=1,n
          pt=pt+1
          y(idx(i),j) = y(idx(i),j)+x(pt)
        end do
      end do
    else
      pt=0
      do j=1,k
        do i=1,n
          pt=pt+1
          y(idx(i),j) = beta*y(idx(i),j)+x(pt)
        end do
      end do
    end if
  end subroutine psi_zsctmv


  subroutine psi_zsctv(n,idx,x,beta,y)

    use psb_const_mod
    implicit none

    integer :: n, idx(:)
    complex(psb_dpk_) :: beta, x(:), y(:)

    ! Locals
    integer :: i

    if (beta == zzero) then
      do i=1,n
        y(idx(i)) = x(i)
      end do
    else if (beta == zone) then
      do i=1,n
        y(idx(i)) = y(idx(i))+x(i)
      end do
    else
      do i=1,n
        y(idx(i)) = beta*y(idx(i))+x(i)
      end do
    end if
  end subroutine psi_zsctv


  subroutine psi_saxpbyv(m,alpha, x, beta, y, info)
    use psb_const_mod
    use psb_error_mod
    implicit none 
    
    integer, intent(in)               :: m
    real(psb_spk_), intent (in)       ::  x(:)
    real(psb_spk_), intent (inout)    ::  y(:)
    real(psb_spk_), intent (in)       :: alpha, beta
    integer, intent(out)                :: info
    integer                  :: err_act
    character(len=20)        :: name, ch_err
    
    name='psb_geaxpby'
    if(psb_get_errstatus() /= 0) return 
    info=0
    call psb_erractionsave(err_act)
    
    if (m < 0) then
      info = 10
      call psb_errpush(info,name,i_err=(/1,m,0,0,0/))
      goto 9999 
    end if
    if (size(x) < m) then 
      info = 36 
      call psb_errpush(info,name,i_err=(/3,m,0,0,0/))
      goto 9999 
    end if
    if (size(y) < m) then 
      info = 36 
      call psb_errpush(info,name,i_err=(/5,m,0,0,0/))
      goto 9999 
    end if
    
    if (m>0) call saxpby(m,1,alpha,x,size(x,1),beta,y,size(y,1),info)
    
    call psb_erractionrestore(err_act)
    return

9999 continue
    call psb_erractionrestore(err_act)
    
    if (err_act == psb_act_abort_) then
      call psb_error()
      return
    end if
    return
    
  end subroutine psi_saxpbyv
  subroutine psi_saxpby(m,n,alpha, x, beta, y, info)
    use psb_const_mod
    use psb_error_mod
    implicit none 
    integer, intent(in)               :: m, n
    real(psb_spk_), intent (in)       ::  x(:,:)
    real(psb_spk_), intent (inout)    ::  y(:,:)
    real(psb_spk_), intent (in)       ::  alpha, beta
    integer, intent(out)                :: info
    integer                  :: err_act
    character(len=20)        :: name, ch_err
    
    name='psb_geaxpby'
    if(psb_get_errstatus() /= 0) return 
    info=0
    call psb_erractionsave(err_act)
    
    if (m < 0) then
      info = 10
      call psb_errpush(info,name,i_err=(/1,m,0,0,0/))
      goto 9999 
    end if
    if (n < 0) then
      info = 10
      call psb_errpush(info,name,i_err=(/2,n,0,0,0/))
      goto 9999 
    end if
    if (size(x,1) < m) then 
      info = 36 
      call psb_errpush(info,name,i_err=(/4,m,0,0,0/))
      goto 9999 
    end if
    if (size(y,1) < m) then 
      info = 36 
      call psb_errpush(info,name,i_err=(/6,m,0,0,0/))
      goto 9999 
    end if

    if ((m>0).and.(n>0)) call saxpby(m,n,alpha,x,size(x,1),beta,y,size(y,1),info)
    
    call psb_erractionrestore(err_act)
    return

9999 continue
    call psb_erractionrestore(err_act)
    
    if (err_act == psb_act_abort_) then
      call psb_error()
      return
    end if
    return
    
  end subroutine psi_saxpby

  subroutine psi_daxpbyv(m,alpha, x, beta, y, info)
    use psb_const_mod
    use psb_error_mod
    implicit none 
    integer, intent(in)               :: m
    real(psb_dpk_), intent (in)       ::  x(:)
    real(psb_dpk_), intent (inout)    ::  y(:)
    real(psb_dpk_), intent (in)       :: alpha, beta
    integer, intent(out)                :: info
    integer                  :: err_act
    character(len=20)        :: name, ch_err
    
    name='psb_geaxpby'
    if(psb_get_errstatus() /= 0) return 
    info=0
    call psb_erractionsave(err_act)
    
    if (m < 0) then
      info = 10
      call psb_errpush(info,name,i_err=(/1,m,0,0,0/))
      goto 9999 
    end if
    if (size(x) < m) then 
      info = 36 
      call psb_errpush(info,name,i_err=(/3,m,0,0,0/))
      goto 9999 
    end if
    if (size(y) < m) then 
      info = 36 
      call psb_errpush(info,name,i_err=(/5,m,0,0,0/))
      goto 9999 
    end if

    if (m>0) call daxpby(m,1,alpha,x,size(x,1),beta,y,size(y,1),info)
    
    call psb_erractionrestore(err_act)
    return

9999 continue
    call psb_erractionrestore(err_act)
    
    if (err_act == psb_act_abort_) then
      call psb_error()
      return
    end if
    return
    
  end subroutine psi_daxpbyv
  subroutine psi_daxpby(m,n,alpha, x, beta, y, info)
    use psb_const_mod
    use psb_error_mod
    implicit none 
    integer, intent(in)               :: m, n
    real(psb_dpk_), intent (in)       ::  x(:,:)
    real(psb_dpk_), intent (inout)    ::  y(:,:)
    real(psb_dpk_), intent (in)       ::  alpha, beta
    integer, intent(out)                :: info
    integer                  :: err_act
    character(len=20)        :: name, ch_err
    
    name='psb_geaxpby'
    if(psb_get_errstatus() /= 0) return 
    info=0
    call psb_erractionsave(err_act)
    
    if (m < 0) then
      info = 10
      call psb_errpush(info,name,i_err=(/1,m,0,0,0/))
      goto 9999 
    end if
    if (n < 0) then
      info = 10
      call psb_errpush(info,name,i_err=(/2,n,0,0,0/))
      goto 9999 
    end if
    if (size(x,1) < m) then 
      info = 36 
      call psb_errpush(info,name,i_err=(/4,m,0,0,0/))
      goto 9999 
    end if
    if (size(y,1) < m) then 
      info = 36 
      call psb_errpush(info,name,i_err=(/6,m,0,0,0/))
      goto 9999 
    end if

    if ((m>0).and.(n>0)) call daxpby(m,n,alpha,x,size(x,1),beta,y,size(y,1),info)
    
    call psb_erractionrestore(err_act)
    return

9999 continue
    call psb_erractionrestore(err_act)
    
    if (err_act == psb_act_abort_) then
      call psb_error()
      return
    end if
    return
  end subroutine psi_daxpby

  subroutine psi_caxpbyv(m,alpha, x, beta, y, info)
    use psb_const_mod
    use psb_error_mod
    implicit none 
    integer, intent(in)               :: m
    complex(psb_spk_), intent (in)       ::  x(:)
    complex(psb_spk_), intent (inout)    ::  y(:)
    complex(psb_spk_), intent (in)       :: alpha, beta
    integer, intent(out)                :: info
    integer                  :: err_act
    character(len=20)        :: name, ch_err
    
    name='psb_geaxpby'
    if(psb_get_errstatus() /= 0) return 
    info=0
    call psb_erractionsave(err_act)
    
    if (m < 0) then
      info = 10
      call psb_errpush(info,name,i_err=(/1,m,0,0,0/))
      goto 9999 
    end if
    if (size(x) < m) then 
      info = 36 
      call psb_errpush(info,name,i_err=(/3,m,0,0,0/))
      goto 9999 
    end if
    if (size(y) < m) then 
      info = 36 
      call psb_errpush(info,name,i_err=(/5,m,0,0,0/))
      goto 9999 
    end if

    if (m>0) call caxpby(m,1,alpha,x,size(x,1),beta,y,size(y,1),info)
    
    call psb_erractionrestore(err_act)
    return

9999 continue
    call psb_erractionrestore(err_act)
    
    if (err_act == psb_act_abort_) then
      call psb_error()
      return
    end if
    return
    
  end subroutine psi_caxpbyv
  subroutine psi_caxpby(m,n,alpha, x, beta, y, info)
    use psb_const_mod
    use psb_error_mod
    implicit none 
    integer, intent(in)               :: m, n
    complex(psb_spk_), intent (in)       ::  x(:,:)
    complex(psb_spk_), intent (inout)    ::  y(:,:)
    complex(psb_spk_), intent (in)       ::  alpha, beta
    integer, intent(out)                :: info
    integer                  :: err_act
    character(len=20)        :: name, ch_err
    
    name='psb_geaxpby'
    if(psb_get_errstatus() /= 0) return 
    info=0
    call psb_erractionsave(err_act)
    
    if (m < 0) then
      info = 10
      call psb_errpush(info,name,i_err=(/1,m,0,0,0/))
      goto 9999 
    end if
    if (n < 0) then
      info = 10
      call psb_errpush(info,name,i_err=(/2,n,0,0,0/))
      goto 9999 
    end if
    if (size(x,1) < m) then 
      info = 36 
      call psb_errpush(info,name,i_err=(/4,m,0,0,0/))
      goto 9999 
    end if
    if (size(y,1) < m) then 
      info = 36 
      call psb_errpush(info,name,i_err=(/6,m,0,0,0/))
      goto 9999 
    end if

    if ((m>0).and.(n>0)) call caxpby(m,n,alpha,x,size(x,1),beta,y,size(y,1),info)
    
    call psb_erractionrestore(err_act)
    return

9999 continue
    call psb_erractionrestore(err_act)
    
    if (err_act == psb_act_abort_) then
      call psb_error()
      return
    end if
    return
  end subroutine psi_caxpby

  subroutine psi_zaxpbyv(m,alpha, x, beta, y, info)
    use psb_const_mod
    use psb_error_mod
    implicit none 
    integer, intent(in)               :: m
    complex(psb_dpk_), intent (in)       ::  x(:)
    complex(psb_dpk_), intent (inout)    ::  y(:)
    complex(psb_dpk_), intent (in)       :: alpha, beta
    integer, intent(out)                :: info
    integer                  :: err_act
    character(len=20)        :: name, ch_err
    
    name='psb_geaxpby'
    if(psb_get_errstatus() /= 0) return 
    info=0
    call psb_erractionsave(err_act)
    
    if (m < 0) then
      info = 10
      call psb_errpush(info,name,i_err=(/1,m,0,0,0/))
      goto 9999 
    end if
    if (size(x) < m) then 
      info = 36 
      call psb_errpush(info,name,i_err=(/3,m,0,0,0/))
      goto 9999 
    end if
    if (size(y) < m) then 
      info = 36 
      call psb_errpush(info,name,i_err=(/5,m,0,0,0/))
      goto 9999 
    end if

    if (m>0) call zaxpby(m,1,alpha,x,size(x,1),beta,y,size(y,1),info)
    
    call psb_erractionrestore(err_act)
    return

9999 continue
    call psb_erractionrestore(err_act)
    
    if (err_act == psb_act_abort_) then
      call psb_error()
      return
    end if
    return
    
  end subroutine psi_zaxpbyv
  subroutine psi_zaxpby(m,n,alpha, x, beta, y, info)
    use psb_const_mod
    use psb_error_mod
    implicit none 
    integer, intent(in)               :: m, n
    complex(psb_dpk_), intent (in)       ::  x(:,:)
    complex(psb_dpk_), intent (inout)    ::  y(:,:)
    complex(psb_dpk_), intent (in)       ::  alpha, beta
    integer, intent(out)                :: info
    integer                  :: err_act
    character(len=20)        :: name, ch_err
    
    name='psb_geaxpby'
    if(psb_get_errstatus() /= 0) return 
    info=0
    call psb_erractionsave(err_act)
    
    if (m < 0) then
      info = 10
      call psb_errpush(info,name,i_err=(/1,m,0,0,0/))
      goto 9999 
    end if
    if (n < 0) then
      info = 10
      call psb_errpush(info,name,i_err=(/2,n,0,0,0/))
      goto 9999 
    end if
    if (size(x,1) < m) then 
      info = 36 
      call psb_errpush(info,name,i_err=(/4,m,0,0,0/))
      goto 9999 
    end if
    if (size(y,1) < m) then 
      info = 36 
      call psb_errpush(info,name,i_err=(/6,m,0,0,0/))
      goto 9999 
    end if

    if ((m>0).and.(n>0)) call zaxpby(m,n,alpha,x,size(x,1),beta,y,size(y,1),info)
    
    call psb_erractionrestore(err_act)
    return

9999 continue
    call psb_erractionrestore(err_act)
    
    if (err_act == psb_act_abort_) then
      call psb_error()
      return
    end if
    return
  end subroutine psi_zaxpby


end module psi_serial_mod