Query: __setfpucw
OS: centos
Section: 3
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__SETFPUCW(3) Linux Programmer's Manual __SETFPUCW(3)NAME__setfpucw - set FPU control word on i386 architecture (obsolete)SYNOPSIS#include <i386/fpu_control.h> 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.CONFORMING TOThis function was a nonstandard GNU extension.NOTESAs of glibc 2.1 this function does not exist anymore. There are new functions from C99, with prototypes in <fenv.h>, to control FPU round- ing modes, like fegetround(3), fesetround(3), and the floating-point environment, like fegetenv(3), feholdexcept(3), fesetenv(3), feupda- teenv(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.EXAMPLE__setfpucw(0x1372) Set FPU control word on the i386 architecture to - extended precision - rounding to nearest - exceptions on overflow, zero divide and NaNSEE ALSOfeclearexcept(3) <fpu_control.h>COLOPHONThis page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. Linux 2012-12-31 __SETFPUCW(3)