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glibc/sysdeps/i386/fpu/s_nextafterl.c
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/* 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 <errno.h> | |
#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) { | |
long double u = x + x; /* overflow */ | |
math_force_eval (u); | |
__set_errno (ERANGE); | |
} | |
if(esy==0) { | |
long double u = x*x; /* underflow */ | |
math_force_eval (u); /* raise underflow flag */ | |
__set_errno (ERANGE); | |
} | |
SET_LDOUBLE_WORDS(x,esx,hx,lx); | |
return x; | |
} | |
weak_alias (__nextafterl, nextafterl) | |
strong_alias (__nextafterl, __nexttowardl) | |
weak_alias (__nextafterl, nexttowardl) |