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Fortran Library Reference

f77_floatingpoint.h: FORTRAN IEEE Definitions

The header file f77_floatingpoint.h defines constants and types used to implement standard floating-point according to ANSI/IEEE Std 754-1985.

Include the file in a FORTRAN 77 source program as follows: 

#include "f77_floatingpoint.h"

Use of this include file requires preprocessing prior to FORTRAN compilation.The source file referencing this include file will automatically be preprocessed if the name has a .F or .F90 extension.

Fortran 90 programs should include the file f90/floatingpoint.h instead.

IEEE Rounding Mode:

fp_direction_type

The type of the IEEE rounding direction mode. The order of enumeration varies according to hardware.  

SIGFPE Handling:

sigfpe_code_type

The type of a SIGFPE code.

sigfpe_handler_type

The type of a user-definable SIGFPE exception handler called to handle a particular SIGFPE code.

SIGFPE_DEFAULT

A macro indicating default SIGFPE exception handling: IEEE exceptions to continue with a default result and to abort for other SIGFPE codes.

SIGFPE_IGNORE

A macro indicating an alternate SIGFPE exception handling, namely to ignore and continue execution.

SIGFPE_ABORT

A macro indicating an alternate SIGFPE exception handling, namely to abort with a core dump.

IEEE Exception Handling:

N_IEEE_EXCEPTION

The number of distinct IEEE floating-point exceptions. 

fp_exception_type

The type of the N_IEEE_EXCEPTION exceptions. Each exception is given a bit number.

fp_exception_field_type

The type intended to hold at least N_IEEE_EXCEPTION bits corresponding to the IEEE exceptions numbered by fp_exception_type. Thus, fp_inexact corresponds to the least significant bit and fp_invalid to the fifth least significant bit. Some operations can set more than one exception.

IEEE Classification:

fp_class_type

A list of the classes of IEEE floating-point values and symbols.  

Refer to the Numerical Computation Guide. See also ieee_environment(3M) and f77_ieee_environment(3F).