| /* 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 */ |
| long double u; |
| SET_LDOUBLE_WORDS64(x,hy&0x8000000000000000ULL,1);/* return +-minsubnormal */ |
| u = math_opt_barrier (x); |
| u = u * u; |
| math_force_eval (u); /* raise underflow flag */ |
| return x; |
| } |
| 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) { |
| long double u = x*x; /* underflow */ |
| math_force_eval (u); /* raise underflow flag */ |
| } |
| SET_LDOUBLE_WORDS64(x,hx,lx); |
| return x; |
| } |
| weak_alias (__nextafterl, nextafterl) |
| strong_alias (__nextafterl, __nexttowardl) |
| weak_alias (__nextafterl, nexttowardl) |
