void __setfpucw(unsigned short control_word);
__setfpucw() transfers control_word to the registers of the FPU (float-
ing-point unit) on the i386 architecture. This was used to control
floating-point precision, rounding and floating-point exceptions.
This function was a nonstandard GNU extension.
As 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), fegetex-
ceptflag(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.
Set FPU control word on the i386 architecture to
- extended precision
- rounding to nearest
- exceptions on overflow, zero divide and NaN
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latest version of this page, can be found at
Linux 2012-12-31 __SETFPUCW(3)
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