DAMASK_EICMD/code/prec.f90

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! Copyright 2011 Max-Planck-Institut für Eisenforschung GmbH
!
! This file is part of DAMASK,
! the Düsseldorf Advanced MAterial Simulation Kit.
!
! DAMASK is free software: you can redistribute it and/or modify
! it under the terms of the GNU General Public License as published by
! the Free Software Foundation, either version 3 of the License, or
! (at your option) any later version.
!
! DAMASK is distributed in the hope that it will be useful,
! but WITHOUT ANY WARRANTY; without even the implied warranty of
! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
! GNU General Public License for more details.
!
! You should have received a copy of the GNU General Public License
! along with DAMASK. If not, see <http://www.gnu.org/licenses/>.
!
!##############################################################
!* $Id$
!##############################################################
#ifdef __INTEL_COMPILER
#if __INTEL_COMPILER<1200
#define LEGACY_COMPILER
#endif
#endif
module prec
!##############################################################
implicit none
private
! *** Precision of real and integer variables ***
integer, parameter, public :: pReal = selected_real_kind(15,300) ! 15 significant digits, up to 1e+-300
integer, parameter, public :: pInt = selected_int_kind(9) ! up to +- 1e9
integer, parameter, public :: pLongInt = selected_int_kind(12) ! should be 64bit
real(pReal), parameter, public :: tol_math_check = 1.0e-8_pReal
real(pReal), parameter, public :: tol_gravityNodePos = 1.0e-100_pReal
! NaN is precision dependent
! from http://www.hpc.unimelb.edu.au/doc/f90lrm/dfum_035.html
! copy can be found in documentation/Code/Fortran
#ifdef LEGACY_COMPILER
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real(pReal), parameter, public :: DAMASK_NaN = Z'7FF8000000000000' ! quiet NaN
#else
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real(pReal), parameter, public :: DAMASK_NaN = real(Z'7FF8000000000000', pReal)
#endif
type, public :: p_vec
real(pReal), dimension(:), pointer :: p
end type p_vec
public :: prec_init
contains
subroutine prec_init
use, intrinsic :: iso_fortran_env ! to get compiler_version and compiler_options (at least for gfortran 4.6 at the moment)
implicit none
!$OMP CRITICAL (write2out)
#ifndef LEGACY_COMPILER
open (6, encoding='UTF-8')
#endif
write(6,*)
write(6,*) '<<<+- prec init -+>>>'
write(6,*) '$Id$'
#include "compilation_info.f90"
write(6,'(a,i3)') ' Bytes for pReal: ',pReal
write(6,'(a,i3)') ' Bytes for pInt: ',pInt
write(6,'(a,i3)') ' Bytes for pLongInt: ',pLongInt
write(6,'(a,e10.3)') ' NaN: ', DAMASK_NaN
write(6,'(a,l3)') ' NaN /= NaN: ',DAMASK_NaN/=DAMASK_NaN
if (DAMASK_NaN == DAMASK_NaN) call quit(9000)
write(6,*)
!$OMP END CRITICAL (write2out)
end subroutine prec_init
end module prec