[thirdparty/gcc.git] / gcc / fortran / doc / gfortran / intrinsic-modules / ieee-modules-ieeeexceptions-ieeearithmetic-and-ieeefeatures.rst

..
  Copyright 1988-2022 Free Software Foundation, Inc.
  This is part of the GCC manual.
  For copying conditions, see the copyright.rst file.

.. _ieee-modules:

IEEE modules: IEEE_EXCEPTIONS, IEEE_ARITHMETIC, and IEEE_FEATURES
*****************************************************************

:samp:`{Standard}:`
  Fortran 2003 and later

  The ``IEEE_EXCEPTIONS``, ``IEEE_ARITHMETIC``, and ``IEEE_FEATURES``
  intrinsic modules provide support for exceptions and IEEE arithmetic, as
  defined in Fortran 2003 and later standards, and the IEC 60559:1989 standard
  (*Binary floating-point arithmetic for microprocessor systems*). These
  modules are only provided on the following supported platforms:

  * i386 and x86_64 processors
  * platforms which use the GNU C Library (glibc)
  * platforms with support for SysV/386 routines for floating point
    interface (including Solaris and BSDs)
  * platforms with the AIX OS

For full compliance with the Fortran standards, code using the
``IEEE_EXCEPTIONS`` or ``IEEE_ARITHMETIC`` modules should be compiled
with the following options: ``-fno-unsafe-math-optimizations
-frounding-math -fsignaling-nans``.
Commit	Line	Data
c63539ff ML	1	..
	2	Copyright 1988-2022 Free Software Foundation, Inc.
	3	This is part of the GCC manual.
	4	For copying conditions, see the copyright.rst file.
	5
	6	.. _ieee-modules:
	7
	8	IEEE modules: IEEE_EXCEPTIONS, IEEE_ARITHMETIC, and IEEE_FEATURES
	9	*****************************************************************
	10
	11	:samp:`{Standard}:`
	12	Fortran 2003 and later
	13
	14	The ``IEEE_EXCEPTIONS``, ``IEEE_ARITHMETIC``, and ``IEEE_FEATURES``
	15	intrinsic modules provide support for exceptions and IEEE arithmetic, as
	16	defined in Fortran 2003 and later standards, and the IEC 60559:1989 standard
	17	(Binary floating-point arithmetic for microprocessor systems). These
	18	modules are only provided on the following supported platforms:
	19
	20	* i386 and x86_64 processors
	21	* platforms which use the GNU C Library (glibc)
	22	* platforms with support for SysV/386 routines for floating point
	23	interface (including Solaris and BSDs)
	24	* platforms with the AIX OS
	25
	26	For full compliance with the Fortran standards, code using the
	27	``IEEE_EXCEPTIONS`` or ``IEEE_ARITHMETIC`` modules should be compiled
	28	with the following options: ``-fno-unsafe-math-optimizations
3ed1b4ce	29	-frounding-math -fsignaling-nans``.