Manpage of __SETFPUCW
__SETFPUCWSection: Linux Programmer's Manual (3)
NAME__setfpucw - set FPU control word on i386 architecture (obsolete)
DESCRIPTION__setfpucw() transfers control_wordto 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 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_GETCWand _FPU_SETCWmacros from <fpu_control.h>can be used.
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