feenableexcept - Linux

Overview

The feenableexcept command enables the specified floating-point exception flags for the current thread. This allows precise control over how floating-point exceptions are handled, which can be useful for debugging and performance optimization.

Syntax

feenableexcept (int __excepts)

  • __excepts: The floating-point exception flags to enable. This is a bitwise OR of the following constants:

    • FE_DIVBYZERO
    • FE_INEXACT
    • FE_INVALID
    • FE_OVERFLOW
    • FE_UNDERFLOW

Options/Flags

None.

Examples

Enable all floating-point exception flags:

feenableexcept(FE_DIVBYZERO | FE_INEXACT | FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW);

Enable only the divide-by-zero and invalid operation exception flags:

feenableexcept(FE_DIVBYZERO | FE_INVALID);

Common Issues

If you attempt to enable an exception flag that is already enabled, the function will return -1 and set errno to EINVAL.

Integration

feenableexcept can be combined with other floating-point control functions, such as fesetenv and feupdateenv, to create a complete floating-point environment.

Related Commands

  • fesetenv
  • fesetexceptflag
  • fesetround