psblas3/base/psblas/psb_cvmlt.f90

!
!                Parallel Sparse BLAS  version 3.5
!      (C) Copyright 2006-2018
!        Salvatore Filippone
!        Alfredo Buttari
!
!    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
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!
!
! File: psb_cvmlt.f90

subroutine psb_cvmlt(x,y,desc_a,info)
  use psb_base_mod, psb_protect_name => psb_cvmlt
  implicit none
  type(psb_c_vect_type), intent (inout) ::  x
  type(psb_c_vect_type), intent (inout) ::  y
  type(psb_desc_type), intent (in)      :: desc_a
  integer(psb_ipk_), intent(out)                  :: info

  ! locals
  integer(psb_ipk_) :: ctxt, np, me,&
       & err_act, iix, jjx, iiy, jjy
  integer(psb_lpk_) :: ix, ijx, iy, ijy, m
  character(len=20)        :: name, ch_err

  name='psb_cgevmlt'
  if (psb_errstatus_fatal()) return
  info=psb_success_
  call psb_erractionsave(err_act)

  ctxt=desc_a%get_context()

  call psb_info(ctxt, me, np)
  if (np == -ione) then
    info = psb_err_context_error_
    call psb_errpush(info,name)
    goto 9999
  endif
  if (.not.allocated(x%v)) then
    info = psb_err_invalid_vect_state_
    call psb_errpush(info,name)
    goto 9999
  endif
  if (.not.allocated(y%v)) then
    info = psb_err_invalid_vect_state_
    call psb_errpush(info,name)
    goto 9999
  endif


  ix = ione
  iy = ione

  m = desc_a%get_global_rows()

  ! check vector correctness
  call psb_chkvect(m,lone,x%get_nrows(),ix,lone,desc_a,info,iix,jjx)
  if(info /= psb_success_) then
    info=psb_err_from_subroutine_
    ch_err='psb_chkvect 1'
    call psb_errpush(info,name,a_err=ch_err)
    goto 9999
  end if
  call psb_chkvect(m,lone,y%get_nrows(),iy,lone,desc_a,info,iiy,jjy)
  if(info /= psb_success_) then
    info=psb_err_from_subroutine_
    ch_err='psb_chkvect 2'
    call psb_errpush(info,name,a_err=ch_err)
    goto 9999
  end if

  if ((iix /= ione).or.(iiy /= ione)) then
    info=psb_err_ix_n1_iy_n1_unsupported_
    call psb_errpush(info,name)
  end if

  if(desc_a%get_local_rows() > 0) then
    call y%base_mlt_v(desc_a%get_local_rows(),&
         & alpha,x,beta,info)
  end if

  call psb_erractionrestore(err_act)
  return

9999 call psb_error_handler(ctxt,err_act)

  return

end subroutine psb_cvmlt