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This file defines constants, types, and functions used to implement standard floating pointaccording to ANSI/IEEE Std 754-1985. The functions are implemented inlibc. Theincluded header file <sys/ieeefp.h> defines certain types of interest to the kernel.

IEEE Rounding Modes

fp_direction_type: The type of the IEEE rounding direction mode. Note: the order of enumeration varies according to hardware.
fp_precision_type: The type of the IEEE rounding precision mode, which only applies on systems that support extended precision such as machines based on the Intel 80387 FPU or the 80486.SIGFPE handling:
sigfpe_code_type: The type of aSIGFPE code.
sigfpe_handler_type: The type of a user-definableSIGFPE exception handler called to handle a particularSIGFPE code.
SIGFPE_DEFAULT: A macro indicating the defaultSIGFPE exception handling, namely to perform the exception handling specified by the user, if any, and otherwise to dump core usingabort(3C).
SIGFPE_IGNORE: A macro indicating an alternateSIGFPE exception handling, namely to ignore and continue execution.
SIGFPE_ABORT: A macro indicating an alternateSIGFPE 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 theN_IEEE_EXCEPTION exceptions. Each exception is given a bit number.
fp_exception_field_type: The type intended to hold at leastN_IEEE_EXCEPTION bits corresponding to the IEEE exceptions numbered byfp_exception_type. Thusfp_inexact corresponds to the least significant bit andfp_invalid to the fifth least significant bit. Note: some operations may set more than one exception.

IEEE Formats and Classification

single; extended; quadruple: Definitions of IEEE formats.
fp_class_type: An enumeration of the various classes of IEEE values and symbols.

IEEE Base Conversion

The functions described underfloating_to_decimal(3C) anddecimal_to_floating(3C) satisfy not only the IEEEStandard, but also the stricter requirements of correct rounding for all arguments.

DECIMAL_STRING_LENGTH: The length of adecimal_string.
decimal_string: The digit buffer in adecimal_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.

Files

/usr/include/sys/ieeefp.h

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	man pages section 3: Library Interfaces and Headers Oracle Solaris 11 Information Library

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floatingpoint.h

, floatingpoint

Synopsis

Description

IEEE Rounding Modes

IEEE Exception Handling

IEEE Formats and Classification

IEEE Base Conversion

Files

See Also