mirror of
https://github.com/autc04/Retro68.git
synced 2024-11-24 07:31:32 +00:00
119 lines
2.6 KiB
C
119 lines
2.6 KiB
C
/* wf_scalb.c -- float version of w_scalb.c.
|
|
* Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
|
|
*/
|
|
|
|
/*
|
|
* ====================================================
|
|
* 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 scalbf(float x, float fn) is provide for
|
|
* passing various standard test suite. One
|
|
* should use scalbn() instead.
|
|
*/
|
|
|
|
#include "fdlibm.h"
|
|
#include <errno.h>
|
|
|
|
#ifdef __STDC__
|
|
#ifdef _SCALB_INT
|
|
float scalbf(float x, int fn) /* wrapper scalbf */
|
|
#else
|
|
float scalbf(float x, float fn) /* wrapper scalbf */
|
|
#endif
|
|
#else
|
|
float scalbf(x,fn) /* wrapper scalbf */
|
|
#ifdef _SCALB_INT
|
|
float x; int fn;
|
|
#else
|
|
float x,fn;
|
|
#endif
|
|
#endif
|
|
{
|
|
#ifdef _IEEE_LIBM
|
|
return __ieee754_scalbf(x,fn);
|
|
#else
|
|
float 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_scalbf(x,fn);
|
|
if(_LIB_VERSION == _IEEE_) return z;
|
|
if(!(finitef(z)||isnan(z))&&finitef(x)) {
|
|
/* scalbf overflow; SVID also returns +-HUGE_VAL */
|
|
exc.type = OVERFLOW;
|
|
exc.name = "scalbf";
|
|
exc.err = 0;
|
|
exc.arg1 = (double)x;
|
|
exc.arg2 = (double)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==(float)0.0&&z!=x) {
|
|
/* scalbf underflow */
|
|
exc.type = UNDERFLOW;
|
|
exc.name = "scalbf";
|
|
exc.err = 0;
|
|
exc.arg1 = (double)x;
|
|
exc.arg2 = (double)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(!finitef(fn)) errno = ERANGE;
|
|
#endif
|
|
return z;
|
|
#endif
|
|
}
|
|
|
|
#ifdef _DOUBLE_IS_32BITS
|
|
|
|
#ifdef __STDC__
|
|
#ifdef _SCALB_INT
|
|
double scalb(double x, int fn)
|
|
#else
|
|
double scalb(double x, double fn)
|
|
#endif
|
|
#else
|
|
double scalb(x, fn)
|
|
#ifdef _SCALB_INT
|
|
double x; int fn;
|
|
#else
|
|
double x,fn;
|
|
#endif
|
|
#endif
|
|
{
|
|
#ifdef _SCALB_INT
|
|
return (double) scalbf((float) x, fn);
|
|
#else
|
|
return (double) scalbf((float) x, (float) fn);
|
|
#endif
|
|
}
|
|
|
|
#endif /* defined(_DOUBLE_IS_32BITS) */
|