floatingpoint - IEEE floating point definitions

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SYNOPSIS

#include <sys/ieeefp.h>
#include <floatingpoint.h>

DESCRIPTION

IEEE Rounding Modes:

fp_direction_type

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

fp_direction

The IEEE rounding direction mode currently in force. This is a global variable that is intended to reflect the hardware state, so it should only be written indirectly through a function like ieee_flags ("set","direction",...) that also sets the hardware state.

fp_precision_type

The type of the IEEE rounding precision mode, which only applies on systems that support extended precision such as Sun-3 systems with 68881's.

fp_precision

The IEEE rounding precision mode currently in force. This is a global variable that is intended to reflect the hardware state on systems with extended precision, so it should only be written indirectly through a function like ieee_flags("set","precision",...).

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 the default SIGFPE exception handling, namely to perform the exception handling specified by calls to ieee_handler(3M), if any, and otherwise to dump core using abort.3

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. Note: some operations may set more than one exception.

fp_accrued_exceptions

The IEEE exceptions between the time this global variable was last cleared, and the last time a function like ieee_flags("get","exception",...) was called to update the variable by obtaining the hardware state.

ieee_handlers

An array of user-specifiable signal handlers for use by the standard SIGFPE handler for IEEE arithmetic-related SIGFPE codes. Since IEEE trapping modes correspond to hardware modes, elements of this array should only be modified with a function like ieee_handler.3m that performs the appropriate hardware mode update. If no sigfpe_handler has been declared for a particular IEEE-related SIGFPE code, then the related ieee_handlers will be invoked.

IEEE Formats and Classification:

single;extended

Definitions of IEEE formats.

fp_class_type

An enumeration of the various classes of IEEE values and symbols.

IEEE Base Conversion:

The functions described under floating_to_decimal.3 and decimal_to_floating.3 not only satisfy the IEEE Standard, but also the stricter requirements of correct rounding for all arguments.

DECIMAL_STRING_LENGTH

The length of a decimal_string.

decimal_string

The digit buffer in a decimal_record.

decimal_record

The canonical form for representing an unpacked decimal floating-point number.

decimal_form

The type used to specify fixed or floating binary to decimal conversion.

decimal_mode

A struct that contains specifications for conversion between binary and decimal.

decimal_string_form

An enumeration of possible valid character strings representing floating-point numbers, infinities, or NaNs.

SEE ALSO

Created by unroff & hp-tools. © somebody (See intro for details). All Rights Reserved. Last modified 11/5/97