mirror of https://gitlab.com/QEF/q-e.git
48 lines
975 B
Fortran
48 lines
975 B
Fortran
!
|
|
! Copyright (C) 2002 FPMD group
|
|
! This file is distributed under the terms of the
|
|
! GNU General Public License. See the file `License'
|
|
! in the root directory of the present distribution,
|
|
! or http://www.gnu.org/copyleft/gpl.txt .
|
|
!
|
|
|
|
SUBROUTINE avrec( n, alpha, v, av )
|
|
|
|
! ... This subroutine try to use fast library to
|
|
! ... calculate
|
|
! ... av(i) = alpha / v(i)
|
|
! ...
|
|
|
|
USE kinds
|
|
IMPLICIT NONE
|
|
INTEGER, INTENT(IN) :: n
|
|
INTEGER :: i
|
|
REAL(DP), INTENT(IN) :: alpha
|
|
REAL(DP), INTENT(IN) :: v(*)
|
|
REAL(DP), INTENT(OUT) :: av(*)
|
|
|
|
#if defined __BENCHLIB
|
|
|
|
CALL oneover_v( n, v, av )
|
|
IF( alpha /= 1.0d0 ) THEN
|
|
CALL DSCAL( n, alpha, av, 1 )
|
|
END IF
|
|
|
|
#elif defined __MASS
|
|
|
|
CALL vrec( av, v, n )
|
|
IF( alpha /= 1.0d0 ) THEN
|
|
CALL DSCAL( n, alpha, av, 1 )
|
|
END IF
|
|
|
|
#else
|
|
|
|
DO i = 1, n
|
|
av(i) = alpha / v(i)
|
|
END DO
|
|
|
|
#endif
|
|
|
|
RETURN
|
|
END SUBROUTINE avrec
|