1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859 |
- /*
- * ====================================================
- * 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.
- * ====================================================
- */
- /*
- * __ieee754_scalb(x, fn) is provided for
- * passing various standard test suites.
- * One should use scalbn() instead.
- */
- #include "math.h"
- #include "math_private.h"
- #include <errno.h>
- double attribute_hidden __ieee754_scalb(double x, double fn)
- {
- if (isnan(x)||isnan(fn)) return x*fn;
- if (!isfinite(fn)) {
- if(fn>0.0) return x*fn;
- else return x/(-fn);
- }
- if (rint(fn)!=fn) return (fn-fn)/(fn-fn);
- if ( fn > 65000.0) return scalbn(x, 65000);
- if (-fn > 65000.0) return scalbn(x,-65000);
- return scalbn(x,(int)fn);
- }
- #if defined __UCLIBC_SUSV3_LEGACY__
- /*
- * wrapper scalb(double x, double fn) is provided for
- * passing various standard test suites.
- * One should use scalbn() instead.
- */
- #ifndef _IEEE_LIBM
- double scalb(double x, double fn)
- {
- double z = __ieee754_scalb(x, fn);
- if (_LIB_VERSION == _IEEE_)
- return z;
- if (!(isfinite(z) || isnan(z)) && isfinite(x))
- return __kernel_standard(x, (double)fn, 32); /* scalb overflow */
- if (z == 0.0 && z != x)
- return __kernel_standard(x, (double)fn, 33); /* scalb underflow */
- if (!isfinite(fn))
- errno = ERANGE;
- return z;
- }
- #else
- strong_alias(__ieee754_scalb, scalb)
- #endif
- #endif /* UCLIBC_SUSV3_LEGACY */
|