| /* s_nextafterl.c -- long double version of s_nextafter.c. |
| * Special version for i387. |
| * Conversion to long double by Ulrich Drepper, |
| * Cygnus Support, drepper@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. |
| * ==================================================== |
| */ |
| |
| #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> |
| |
| long double __nextafterl(long double x, long double y) |
| { |
| u_int32_t hx,hy,ix,iy; |
| u_int32_t lx,ly; |
| int32_t esx,esy; |
| |
| GET_LDOUBLE_WORDS(esx,hx,lx,x); |
| GET_LDOUBLE_WORDS(esy,hy,ly,y); |
| ix = esx&0x7fff; /* |x| */ |
| iy = esy&0x7fff; /* |y| */ |
| |
| /* Intel's extended format has the normally implicit 1 explicit |
| present. Sigh! */ |
| if(((ix==0x7fff)&&(((hx&0x7fffffff)|lx)!=0)) || /* x is nan */ |
| ((iy==0x7fff)&&(((hy&0x7fffffff)|ly)!=0))) /* y is nan */ |
| return x+y; |
| if(x==y) return y; /* x=y, return y */ |
| if((ix|hx|lx)==0) { /* x == 0 */ |
| long double u; |
| SET_LDOUBLE_WORDS(x,esy&0x8000,0,1);/* return +-minsubnormal */ |
| u = math_opt_barrier (x); |
| u = u * u; |
| math_force_eval (u); /* raise underflow flag */ |
| return x; |
| } |
| if(esx>=0) { /* x > 0 */ |
| if(esx>esy||((esx==esy) && (hx>hy||((hx==hy)&&(lx>ly))))) { |
| /* x > y, x -= ulp */ |
| if(lx==0) { |
| if (hx <= 0x80000000) { |
| if (esx == 0) { |
| --hx; |
| } else { |
| esx -= 1; |
| hx = hx - 1; |
| if (esx > 0) |
| hx |= 0x80000000; |
| } |
| } else |
| hx -= 1; |
| } |
| lx -= 1; |
| } else { /* x < y, x += ulp */ |
| lx += 1; |
| if(lx==0) { |
| hx += 1; |
| if (hx==0 || (esx == 0 && hx == 0x80000000)) { |
| esx += 1; |
| hx |= 0x80000000; |
| } |
| } |
| } |
| } else { /* x < 0 */ |
| if(esy>=0||(esx>esy||((esx==esy)&&(hx>hy||((hx==hy)&&(lx>ly)))))){ |
| /* x < y, x -= ulp */ |
| if(lx==0) { |
| if (hx <= 0x80000000) { |
| esx -= 1; |
| hx = hx - 1; |
| if ((esx&0x7fff) > 0) |
| hx |= 0x80000000; |
| } else |
| hx -= 1; |
| } |
| lx -= 1; |
| } else { /* x > y, x += ulp */ |
| lx += 1; |
| if(lx==0) { |
| hx += 1; |
| if (hx==0 || (esx == 0xffff8000 && hx == 0x80000000)) { |
| esx += 1; |
| hx |= 0x80000000; |
| } |
| } |
| } |
| } |
| esy = esx&0x7fff; |
| if(esy==0x7fff) return x+x; /* overflow */ |
| if(esy==0) { |
| long double u = x*x; /* underflow */ |
| math_force_eval (u); /* raise underflow flag */ |
| } |
| SET_LDOUBLE_WORDS(x,esx,hx,lx); |
| return x; |
| } |
| weak_alias (__nextafterl, nextafterl) |
| strong_alias (__nextafterl, __nexttowardl) |
| weak_alias (__nextafterl, nexttowardl) |