The GNU Fortran Compiler: IEEE modules

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### 9.3 IEEE modules: `IEEE_EXCEPTIONS`, `IEEE_ARITHMETIC`, and `IEEE_FEATURES`

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`.