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msvcrt: Don't use fegetenv in nearbyint.
The fegetenv/feupdateenv functions are broken in msvcr120 and are causing unintentional SSE control word changes. Signed-off-by: Piotr Caban <piotr@codeweavers.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>
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@ -6844,13 +6844,25 @@ double CDECL _yn(int n, double x)
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*/
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double CDECL nearbyint(double x)
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{
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fenv_t env;
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BOOL update_cw, update_sw;
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unsigned int cw, sw;
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fegetenv(&env);
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_control87(_MCW_EM, _MCW_EM);
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_setfp(&cw, 0, &sw, 0);
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update_cw = !(cw & _EM_INEXACT);
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update_sw = !(sw & _SW_INEXACT);
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if (update_cw)
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{
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cw |= _EM_INEXACT;
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_setfp(&cw, _EM_INEXACT, NULL, 0);
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}
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x = rint(x);
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feclearexcept(FE_INEXACT);
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feupdateenv(&env);
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if (update_cw || update_sw)
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{
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sw = 0;
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cw &= ~_EM_INEXACT;
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_setfp(update_cw ? &cw : NULL, _EM_INEXACT,
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update_sw ? &sw : NULL, _SW_INEXACT);
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}
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return x;
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}
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