mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-11 15:50:06 +00:00
86 lines
2.3 KiB
C
86 lines
2.3 KiB
C
/* s_nextafterl.c -- long double version of s_nextafter.c.
|
|
* Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz.
|
|
*/
|
|
|
|
/*
|
|
* ====================================================
|
|
* 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.
|
|
* ====================================================
|
|
*/
|
|
|
|
#if defined(LIBM_SCCS) && !defined(lint)
|
|
static char rcsid[] = "$NetBSD: $";
|
|
#endif
|
|
|
|
/* IEEE functions
|
|
* nextafterl(x,y)
|
|
* return the next machine floating-point number of x in the
|
|
* direction toward y.
|
|
* Special cases:
|
|
*/
|
|
|
|
#include "math.h"
|
|
#include "math_private.h"
|
|
|
|
#ifdef __STDC__
|
|
long double __nextafterl(long double x, long double y)
|
|
#else
|
|
long double __nextafterl(x,y)
|
|
long double x,y;
|
|
#endif
|
|
{
|
|
int64_t hx,hy,ix,iy;
|
|
u_int64_t lx,ly;
|
|
|
|
GET_LDOUBLE_WORDS64(hx,lx,x);
|
|
GET_LDOUBLE_WORDS64(hy,ly,y);
|
|
ix = hx&0x7fffffffffffffffLL; /* |x| */
|
|
iy = hy&0x7fffffffffffffffLL; /* |y| */
|
|
|
|
if(((ix>=0x7fff000000000000LL)&&((ix-0x7fff000000000000LL)|lx)!=0) || /* x is nan */
|
|
((iy>=0x7fff000000000000LL)&&((iy-0x7fff000000000000LL)|ly)!=0)) /* y is nan */
|
|
return x+y;
|
|
if(x==y) return y; /* x=y, return y */
|
|
if((ix|lx)==0) { /* x == 0 */
|
|
SET_LDOUBLE_WORDS64(x,hy&0x8000000000000000ULL,1);/* return +-minsubnormal */
|
|
y = x*x;
|
|
if(y==x) return y; else return x; /* raise underflow flag */
|
|
}
|
|
if(hx>=0) { /* x > 0 */
|
|
if(hx>hy||((hx==hy)&&(lx>ly))) { /* x > y, x -= ulp */
|
|
if(lx==0) hx--;
|
|
lx--;
|
|
} else { /* x < y, x += ulp */
|
|
lx++;
|
|
if(lx==0) hx++;
|
|
}
|
|
} else { /* x < 0 */
|
|
if(hy>=0||hx>hy||((hx==hy)&&(lx>ly))){/* x < y, x -= ulp */
|
|
if(lx==0) hx--;
|
|
lx--;
|
|
} else { /* x > y, x += ulp */
|
|
lx++;
|
|
if(lx==0) hx++;
|
|
}
|
|
}
|
|
hy = hx&0x7fff000000000000LL;
|
|
if(hy==0x7fff000000000000LL) return x+x;/* overflow */
|
|
if(hy==0) { /* underflow */
|
|
y = x*x;
|
|
if(y!=x) { /* raise underflow flag */
|
|
SET_LDOUBLE_WORDS64(y,hx,lx);
|
|
return y;
|
|
}
|
|
}
|
|
SET_LDOUBLE_WORDS64(x,hx,lx);
|
|
return x;
|
|
}
|
|
weak_alias (__nextafterl, nextafterl)
|
|
strong_alias (__nextafterl, __nexttowardl)
|
|
weak_alias (__nextafterl, nexttowardl)
|