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Base Operating System and Extensions Technical Reference, Volume 1

fp_invalid_op, fp_divbyzero, fp_overflow, fp_underflow, fp_inexact, fp_any_xcp Subroutine

Purpose

Tests to see if a floating-point exception has occurred.

Library

Standard C Library (libc.a)

Syntax



#include <float.h>
#include <fpxcp.h>
int 
fp_invalid_op() 
int fp_divbyzero()
int fp_overflow() 
int fp_underflow()
int 
fp_inexact()
int fp_any_xcp()

Description

These subroutines aid in determining when an exception has occurred and the exception type. These subroutines can be called explicitly after blocks of code that may cause a floating-point exception.

Return Values

The fp_invalid_op subroutine returns a value of 1 if a floating-point invalid-operation exception status flag is set. Otherwise, a value of 0 is returned.

The fp_divbyzero subroutine returns a value of 1 if a floating-point divide-by-zero exception status flag is set. Otherwise, a value of 0 is returned.

The fp_overflow subroutine returns a value of 1 if a floating-point overflow exception status flag is set. Otherwise, a value of 0 is returned.

The fp_underflow subroutine returns a value of 1 if a floating-point underflow exception status flag is set. Otherwise, a value of 0 is returned.

The fp_inexact subroutine returns a value of 1 if a floating-point inexact exception status flag is set. Otherwise, a value of 0 is returned.

The fp_any_xcp subroutine returns a value of 1 if a floating-point invalid operation, divide-by-zero, overflow, underflow, or inexact exception status flag is set. Otherwise, a value of 0 is returned.

Implementation Specifics

These subroutines are part of Base Operating System (BOS) Runtime.

Related Information

The fp_any_enable, fp_is_enabled, fp_enable_all, fp_enable fp_disable_all, or fp_disable subroutine, fp_clr_flag, fp_read_flag, fp_set_flag, or fp_swap_flag subroutine, fp_read_rnd or fp_swap_rnd subroutine.

Floating-Point Processor Overview in POWERstation and POWERserver Hardware Technical Information-General Architectures.

Floating-Poin t Exceptions Overview and Subroutines Overview in AIX Version 4.3 General Programming Concepts: Writing and Debugging Programs.


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