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21 lines
433 B
C
21 lines
433 B
C
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#include <fenv.h>
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#include "libm.h"
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/*
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rint may raise inexact (and it should not alter the fenv otherwise)
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nearbyint must not raise inexact
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(according to ieee754r section 7.9 both functions should raise invalid
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when the input is signaling nan, but c99 does not define snan so saving
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and restoring the entire fenv should be fine)
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*/
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double nearbyint(double x) {
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fenv_t e;
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fegetenv(&e);
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x = rint(x);
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fesetenv(&e);
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return x;
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}
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