mirror of
https://github.com/autc04/Retro68.git
synced 2024-09-07 13:54:33 +00:00
95 lines
2.1 KiB
C
95 lines
2.1 KiB
C
|
|
/* @(#)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 <errno.h>
|
|
|
|
#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) */
|