From 8a0efa53e44919bcf5ccb1d3353618a82afdf8bc Mon Sep 17 00:00:00 2001 From: Christopher Faylor Date: Thu, 17 Feb 2000 19:39:52 +0000 Subject: import newlib-2000-02-17 snapshot --- newlib/libm/math/w_scalb.c | 94 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 94 insertions(+) create mode 100644 newlib/libm/math/w_scalb.c (limited to 'newlib/libm/math/w_scalb.c') diff --git a/newlib/libm/math/w_scalb.c b/newlib/libm/math/w_scalb.c new file mode 100644 index 000000000..c32496892 --- /dev/null +++ b/newlib/libm/math/w_scalb.c @@ -0,0 +1,94 @@ + +/* @(#)w_scalb.c 5.1 93/09/24 */ +/* + * ==================================================== + * 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. + * ==================================================== + */ + +/* + * wrapper scalb(double x, double fn) is provide for + * passing various standard test suite. One + * should use scalbn() instead. + */ + +#include "fdlibm.h" +#include + +#ifndef _DOUBLE_IS_32BITS + +#ifdef __STDC__ +#ifdef _SCALB_INT + double scalb(double x, int fn) /* wrapper scalb */ +#else + double scalb(double x, double fn) /* wrapper scalb */ +#endif +#else + double scalb(x,fn) /* wrapper scalb */ +#ifdef _SCALB_INT + double x; int fn; +#else + double x,fn; +#endif +#endif +{ +#ifdef _IEEE_LIBM + return __ieee754_scalb(x,fn); +#else + double z; +#ifndef HUGE_VAL +#define HUGE_VAL inf + double inf = 0.0; + + SET_HIGH_WORD(inf,0x7ff00000); /* set inf to infinite */ +#endif + struct exception exc; + z = __ieee754_scalb(x,fn); + if(_LIB_VERSION == _IEEE_) return z; + if(!(finite(z)||isnan(z))&&finite(x)) { + /* scalb overflow; SVID also returns +-HUGE_VAL */ + exc.type = OVERFLOW; + exc.name = "scalb"; + exc.err = 0; + exc.arg1 = x; + exc.arg2 = fn; + exc.retval = x > 0.0 ? HUGE_VAL : -HUGE_VAL; + if (_LIB_VERSION == _POSIX_) + errno = ERANGE; + else if (!matherr(&exc)) { + errno = ERANGE; + } + if (exc.err != 0) + errno = exc.err; + return exc.retval; + } + if(z==0.0&&z!=x) { + /* scalb underflow */ + exc.type = UNDERFLOW; + exc.name = "scalb"; + exc.err = 0; + exc.arg1 = x; + exc.arg2 = fn; + exc.retval = copysign(0.0,x); + if (_LIB_VERSION == _POSIX_) + errno = ERANGE; + else if (!matherr(&exc)) { + errno = ERANGE; + } + if (exc.err != 0) + errno = exc.err; + return exc.retval; + } +#ifndef _SCALB_INT + if(!finite(fn)) errno = ERANGE; +#endif + return z; +#endif +} + +#endif /* defined(_DOUBLE_IS_32BITS) */ -- cgit v1.2.3