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>