__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
              o  extended precision
              o  rounding to nearest
              o  exceptions on overflow, zero divide and NaN

SEE ALSO
       feclearexcept(3)

       <fpu_control.h>

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