glibc/sysdeps/libm-ieee754/s_nexttoward.c
Ulrich Drepper 36fe9ac901 Update.
1999-01-19  Ulrich Drepper  <drepper@cygnus.com>

	* math/Makefile (libm-calls): Rename s_nextafterx to s_nexttoward.
	* math/Versions: Likewise.
	* math/bits/mathcalls.h: Likewise.
	* manual/arith.texi: Likewise.
	* sysdeps/libm-ieee754/s_nextafterl.c: Likewise.
	* sysdeps/libm-ieee754/s_nextafterx.c: Replaced by...
	* sysdeps/libm-ieee754/s_nexttoward.c: New file.
	* sysdeps/libm-ieee754/s_nextafterxf.c: Replaced by...
	* sysdeps/libm-ieee754/s_nexttowardf.c: New file.
	* sysdeps/libm-ieee754/s_nextafterxl.c: Replaced by...
	* sysdeps/libm-ieee754/s_nexttowardl.c: New file.

	* time/Makefile (routines): Removed strfxtime.
	* time/Versions: Likewise.
	* time/strfxtime.c: Removed.
	* time/time.h: Remove _LOCALTIME, _NO_LEAP_SECONDS, struct tmx,
	mkxtime, and strfxtime.
1999-01-19 10:11:00 +00:00

99 lines
2.5 KiB
C

/* s_nexttoward.c
* Conversion from s_nextafter.c 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
* nextafterx(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__
double __nexttoward(double x, long double y)
#else
double __nexttoward(x,y)
double x;
long double y;
#endif
{
int32_t hx,ix,iy;
u_int32_t lx,hy,ly,esy;
EXTRACT_WORDS(hx,lx,x);
GET_LDOUBLE_WORDS(esy,hy,ly,y);
ix = hx&0x7fffffff; /* |x| */
iy = esy&0x7fff; /* |y| */
if(((ix>=0x7ff00000)&&((ix-0x7ff00000)|lx)!=0) || /* x is nan */
((iy>=0x7fff)&&((hy|ly)|-(hy|ly))!=0)) /* y is nan */
return x+y;
if((long double) x==y) return x; /* x=y, return x */
if((ix|lx)==0) { /* x == 0 */
double x2;
INSERT_WORDS(x,esy&0x8000?0x80000000:0,1);/* return +-minsub */
x2 = x*x;
if(x2==x) return x2; else return x; /* raise underflow flag */
}
if(hx>=0) { /* x > 0 */
if (esy>=0x8000||((ix>>20)&0x7ff)>iy
|| (((ix>>20)&0x7ff)==iy
&& (((hx<<11)|(lx>>21))>(hy&0x7fffffff)
|| (((hx<<11)|(lx>>21))==(hy&0x7fffffff)
&& (lx<<11)>ly)))) { /* x > y, x -= ulp */
if(lx==0) hx -= 1;
lx -= 1;
} else { /* x < y, x += ulp */
lx += 1;
if(lx==0) hx += 1;
}
} else { /* x < 0 */
if (esy<0x8000||((ix>>20)&0x7ff)>iy
|| (((ix>>20)&0x7ff)==iy
&& (((hx<<11)|(lx>>21))>(hy&0x7fffffff)
|| (((hx<<11)|(lx>>21))==(hy&0x7fffffff)
&& (lx<<11)>ly)))) {/* x < y, x -= ulp */
if(lx==0) hx -= 1;
lx -= 1;
} else { /* x > y, x += ulp */
lx += 1;
if(lx==0) hx += 1;
}
}
hy = hx&0x7ff00000;
if(hy>=0x7ff00000) return x+x; /* overflow */
if(hy<0x00100000) { /* underflow */
double x2 = x*x;
if(x2!=x) { /* raise underflow flag */
INSERT_WORDS(x2,hx,lx);
return x2;
}
}
INSERT_WORDS(x,hx,lx);
return x;
}
weak_alias (__nexttoward, nexttoward)
#ifdef NO_LONG_DOUBLE
strong_alias (__nexttoward, __nexttowardl)
weak_alias (__nexttoward, nexttowardl)
#endif