Man page - __setfpucw(3)

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Manual

__setfpucw

NAME
LIBRARY
SYNOPSIS
DESCRIPTION
STANDARDS
HISTORY
NOTES
EXAMPLES
SEE ALSO

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>