prime/src/Runtime/w_acos.c

40 lines
832 B
C

/* @(#)w_acos.c 1.2 95/01/04 */
/*
* ====================================================
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
*
* Developed at SunPro, a Sun Microsystems, Inc. business.
* Permission to use, copy, modify, and distribute this
* software is freely granted, provided that this notice
* is preserved.
* ====================================================
*/
/*
* wrap_acos(x)
*/
#include "fdlibm.h"
#ifdef __STDC__
double acos(double x) /* wrapper acos */
#else
double acos(x) /* wrapper acos */
double x;
#endif
{
#ifdef _IEEE_LIBM
return __ieee754_acos(x);
#else
double z;
z = __ieee754_acos(x);
if (_LIB_VERSION == _IEEE_ || isnan(x))
return z;
if (fabs(x) > 1.0) {
return __kernel_standard(x, x, 1); /* acos(|x|>1) */
} else
return z;
#endif
}