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219 lines
6.3 KiB
Fortran
219 lines
6.3 KiB
Fortran
! Implementation of the IEEE_EXCEPTIONS standard intrinsic module
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! Copyright (C) 2013-2015 Free Software Foundation, Inc.
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! Contributed by Francois-Xavier Coudert <fxcoudert@gcc.gnu.org>
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!
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! This file is part of the GNU Fortran runtime library (libgfortran).
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!
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! Libgfortran is free software; you can redistribute it and/or
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! modify it under the terms of the GNU General Public
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! License as published by the Free Software Foundation; either
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! version 3 of the License, or (at your option) any later version.
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!
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! Libgfortran is distributed in the hope that it will be useful,
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! but WITHOUT ANY WARRANTY; without even the implied warranty of
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! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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! GNU General Public License for more details.
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!
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! Under Section 7 of GPL version 3, you are granted additional
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! permissions described in the GCC Runtime Library Exception, version
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! 3.1, as published by the Free Software Foundation.
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!
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! You should have received a copy of the GNU General Public License and
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! a copy of the GCC Runtime Library Exception along with this program;
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! see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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! <http://www.gnu.org/licenses/>. */
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#include "config.h"
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#include "kinds.inc"
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#include "c99_protos.inc"
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#include "fpu-target.inc"
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module IEEE_EXCEPTIONS
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implicit none
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private
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! Derived types and named constants
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type, public :: IEEE_FLAG_TYPE
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private
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integer :: hidden
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end type
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type(IEEE_FLAG_TYPE), parameter, public :: &
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IEEE_INVALID = IEEE_FLAG_TYPE(GFC_FPE_INVALID), &
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IEEE_OVERFLOW = IEEE_FLAG_TYPE(GFC_FPE_OVERFLOW), &
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IEEE_DIVIDE_BY_ZERO = IEEE_FLAG_TYPE(GFC_FPE_ZERO), &
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IEEE_UNDERFLOW = IEEE_FLAG_TYPE(GFC_FPE_UNDERFLOW), &
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IEEE_INEXACT = IEEE_FLAG_TYPE(GFC_FPE_INEXACT)
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type(IEEE_FLAG_TYPE), parameter, public :: &
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IEEE_USUAL(3) = [ IEEE_OVERFLOW, IEEE_DIVIDE_BY_ZERO, IEEE_INVALID ], &
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IEEE_ALL(5) = [ IEEE_USUAL, IEEE_UNDERFLOW, IEEE_INEXACT ]
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type, public :: IEEE_STATUS_TYPE
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private
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character(len=GFC_FPE_STATE_BUFFER_SIZE) :: hidden
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end type
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interface IEEE_SUPPORT_FLAG
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module procedure IEEE_SUPPORT_FLAG_NOARG, &
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IEEE_SUPPORT_FLAG_4, &
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IEEE_SUPPORT_FLAG_8
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end interface IEEE_SUPPORT_FLAG
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public :: IEEE_SUPPORT_FLAG, IEEE_SUPPORT_HALTING
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public :: IEEE_SET_HALTING_MODE, IEEE_GET_HALTING_MODE
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public :: IEEE_SET_FLAG, IEEE_GET_FLAG
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public :: IEEE_SET_STATUS, IEEE_GET_STATUS
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contains
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! Saving and restoring floating-point status
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subroutine IEEE_GET_STATUS (STATUS_VALUE)
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implicit none
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type(IEEE_STATUS_TYPE), intent(out) :: STATUS_VALUE
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interface
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subroutine helper(ptr) &
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bind(c, name="_gfortrani_get_fpu_state")
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use, intrinsic :: iso_c_binding, only : c_char
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character(kind=c_char) :: ptr(*)
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end subroutine
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end interface
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call helper(STATUS_VALUE%hidden)
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end subroutine
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subroutine IEEE_SET_STATUS (STATUS_VALUE)
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implicit none
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type(IEEE_STATUS_TYPE), intent(in) :: STATUS_VALUE
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interface
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subroutine helper(ptr) &
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bind(c, name="_gfortrani_set_fpu_state")
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use, intrinsic :: iso_c_binding, only : c_char
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character(kind=c_char) :: ptr(*)
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end subroutine
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end interface
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call helper(STATUS_VALUE%hidden)
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end subroutine
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! Getting and setting flags
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elemental subroutine IEEE_GET_FLAG (FLAG, FLAG_VALUE)
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implicit none
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type(IEEE_FLAG_TYPE), intent(in) :: FLAG
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logical, intent(out) :: FLAG_VALUE
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interface
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pure integer function helper() &
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bind(c, name="_gfortrani_get_fpu_except_flags")
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end function
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end interface
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FLAG_VALUE = (IAND(helper(), FLAG%hidden) /= 0)
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end subroutine
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elemental subroutine IEEE_SET_FLAG (FLAG, FLAG_VALUE)
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implicit none
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type(IEEE_FLAG_TYPE), intent(in) :: FLAG
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logical, intent(in) :: FLAG_VALUE
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interface
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pure subroutine helper(set, clear) &
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bind(c, name="_gfortrani_set_fpu_except_flags")
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integer, intent(in), value :: set, clear
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end subroutine
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end interface
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if (FLAG_VALUE) then
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call helper(FLAG%hidden, 0)
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else
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call helper(0, FLAG%hidden)
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end if
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end subroutine
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! Querying and changing the halting mode
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elemental subroutine IEEE_GET_HALTING_MODE (FLAG, HALTING)
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implicit none
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type(IEEE_FLAG_TYPE), intent(in) :: FLAG
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logical, intent(out) :: HALTING
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interface
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pure integer function helper() &
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bind(c, name="_gfortrani_get_fpu_trap_exceptions")
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end function
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end interface
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HALTING = (IAND(helper(), FLAG%hidden) /= 0)
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end subroutine
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elemental subroutine IEEE_SET_HALTING_MODE (FLAG, HALTING)
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implicit none
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type(IEEE_FLAG_TYPE), intent(in) :: FLAG
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logical, intent(in) :: HALTING
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interface
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pure subroutine helper(trap, notrap) &
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bind(c, name="_gfortrani_set_fpu_trap_exceptions")
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integer, intent(in), value :: trap, notrap
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end subroutine
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end interface
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if (HALTING) then
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call helper(FLAG%hidden, 0)
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else
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call helper(0, FLAG%hidden)
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end if
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end subroutine
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! Querying support
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pure logical function IEEE_SUPPORT_HALTING (FLAG)
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implicit none
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type(IEEE_FLAG_TYPE), intent(in) :: FLAG
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interface
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pure integer function helper(flag) &
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bind(c, name="_gfortrani_support_fpu_trap")
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integer, intent(in), value :: flag
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end function
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end interface
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IEEE_SUPPORT_HALTING = (helper(FLAG%hidden) /= 0)
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end function
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pure logical function IEEE_SUPPORT_FLAG_NOARG (FLAG)
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implicit none
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type(IEEE_FLAG_TYPE), intent(in) :: FLAG
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interface
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pure integer function helper(flag) &
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bind(c, name="_gfortrani_support_fpu_flag")
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integer, intent(in), value :: flag
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end function
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end interface
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IEEE_SUPPORT_FLAG_NOARG = (helper(FLAG%hidden) /= 0)
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end function
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pure logical function IEEE_SUPPORT_FLAG_4 (FLAG, X) result(res)
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implicit none
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type(IEEE_FLAG_TYPE), intent(in) :: FLAG
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real(kind=4), intent(in) :: X
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res = IEEE_SUPPORT_FLAG_NOARG(FLAG)
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end function
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pure logical function IEEE_SUPPORT_FLAG_8 (FLAG, X) result(res)
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implicit none
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type(IEEE_FLAG_TYPE), intent(in) :: FLAG
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real(kind=8), intent(in) :: X
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res = IEEE_SUPPORT_FLAG_NOARG(FLAG)
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end function
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end module IEEE_EXCEPTIONS
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