__setfpucw(3)                               Library Functions Manual                               __setfpucw(3)

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>

Linux man-pages 6.7                                2023-10-31                                      __setfpucw(3)