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/* isnanl()
* isfinitel()
* signbitl()
*
* Floating point IEEE special number tests
*
*
*
* SYNOPSIS:
*
* int signbitl(), isnanl(), isfinitel();
* long double x, y;
*
* n = signbitl(x);
* n = isnanl(x);
* n = isfinitel(x);
*
*
*
* DESCRIPTION:
*
* These functions are part of the standard C run time library
* for some but not all C compilers. The ones supplied are
* written in C for IEEE arithmetic. They should
* be used only if your compiler library does not already have
* them.
*
*/
/*
Cephes Math Library Release 2.7: June, 1998
Copyright 1992, 1998 by Stephen L. Moshier
*/
#include <math.h>
/* This is defined in mconf.h. */
/* #define DENORMAL 1 */
#ifdef UNK
/* Change UNK into something else. */
#undef UNK
#if BIGENDIAN
#define MIEEE 1
#else
#define IBMPC 1
#endif
#endif
/* Return 1 if the sign bit of x is 1, else 0. */
int signbitl(x)
long double x;
{
union
{
long double d;
short s[6];
int i[3];
} u;
u.d = x;
if( sizeof(int) == 4 )
{
#ifdef IBMPC
return( u.s[4] < 0 );
#endif
#ifdef MIEEE
return( u.i[0] < 0 );
#endif
}
else
{
#ifdef IBMPC
return( u.s[4] < 0 );
#endif
#ifdef MIEEE
return( u.s[0] < 0 );
#endif
}
}
/* Return 1 if x is a number that is Not a Number, else return 0. */
int isnanl(x)
long double x;
{
#ifdef NANS
union
{
long double d;
unsigned short s[6];
unsigned int i[3];
} u;
u.d = x;
if( sizeof(int) == 4 )
{
#ifdef IBMPC
if( ((u.s[4] & 0x7fff) == 0x7fff)
&& (((u.i[1] & 0x7fffffff)!= 0) || (u.i[0] != 0)))
return 1;
#endif
#ifdef MIEEE
if( ((u.i[0] & 0x7fff0000) == 0x7fff0000)
&& (((u.i[1] & 0x7fffffff) != 0) || (u.i[2] != 0)))
return 1;
#endif
return(0);
}
else
{ /* size int not 4 */
#ifdef IBMPC
if( (u.s[4] & 0x7fff) == 0x7fff)
{
if((u.s[3] & 0x7fff) | u.s[2] | u.s[1] | u.s[0])
return(1);
}
#endif
#ifdef MIEEE
if( (u.s[0] & 0x7fff) == 0x7fff)
{
if((u.s[2] & 0x7fff) | u.s[3] | u.s[4] | u.s[5])
return(1);
}
#endif
return(0);
} /* size int not 4 */
#else
/* No NANS. */
return(0);
#endif
}
/* Return 1 if x is not infinite and is not a NaN. */
int isfinitel(x)
long double x;
{
#ifdef INFINITIES
union
{
long double d;
unsigned short s[6];
unsigned int i[3];
} u;
u.d = x;
if( sizeof(int) == 4 )
{
#ifdef IBMPC
if( (u.s[4] & 0x7fff) != 0x7fff)
return 1;
#endif
#ifdef MIEEE
if( (u.i[0] & 0x7fff0000) != 0x7fff0000)
return 1;
#endif
return(0);
}
else
{
#ifdef IBMPC
if( (u.s[4] & 0x7fff) != 0x7fff)
return 1;
#endif
#ifdef MIEEE
if( (u.s[0] & 0x7fff) != 0x7fff)
return 1;
#endif
return(0);
}
#else
/* No INFINITY. */
return(1);
#endif
}
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