Linux cli command __setfpucw

➡ A Linux man page (short for manual page) is a form of software documentation found on Linux and Unix-like operating systems. This man-page explains the command __setfpucw and provides detailed information about the command __setfpucw, system calls, library functions, and other aspects of the system, including usage, options, and examples of _. You can access this man page by typing man followed by the __setfpucw.

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NAME 🖥️ __setfpucw 🖥️

set FPU control word on i386 architecture (obsolete)

LIBRARY

Standard C library (libc, -lc)

SYNOPSIS

#include <i386/fpu_control.h>
[[deprecated]] void __setfpucw(unsigned short control_word);

DESCRIPTION

__setfpucw() transfers control_word to the registers of the FPU (floating-point unit) on the i386 architecture. This was used to control floating-point precision, rounding and floating-point exceptions.

STANDARDS

GNU.

HISTORY

Removed in glibc 2.1.

NOTES

There are new functions from C99, with prototypes in <fenv.h>, to control FPU rounding modes, like fegetround(3), fesetround(3), and the floating-point environment, like fegetenv(3), feholdexcept(3), fesetenv(3), feupdateenv(3), and FPU exception handling, like feclearexcept(3), fegetexceptflag(3), feraiseexcept(3), fesetexceptflag(3), and fetestexcept(3).

If direct access to the FPU control word is still needed, the _FPU_GETCW and _FPU_SETCW macros from <fpu_control.h> can be used.

EXAMPLES

__setfpucw(0x1372)

Set FPU control word on the i386 architecture to

  • extended precision

  • rounding to nearest

  • exceptions on overflow, zero divide and NaN

SEE ALSO

feclearexcept(3)

<fpu_control.h>

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