glibc/sysdeps/ieee754/ldbl-96/s_nexttoward.c
Ulrich Drepper 636ccfc8fb Update.
2001-06-14  Roland McGrath  <roland@frob.com>

	* configure.in: Let sysdeps Implies files in add-ons bring in
	sysdeps directories from the main source and other add-ons too.

2001-06-15  Jakub Jelinek  <jakub@redhat.com>

	* math/test-misc.c (main): Add tests for nextafter and nexttoward
	with +-Inf as second argument.

	* sysdeps/generic/s_nexttowardf.c (__nexttowardf): Only check for
	NaN, not Inf.
	* sysdeps/i386/fpu/s_nextafterl.c (__nextafterl): Fix check for NaN.
	* sysdeps/i386/fpu/s_nexttoward.c: New.
	* sysdeps/i386/fpu/s_nexttowardf.c: New.
	* sysdeps/ieee754/ldbl-96/s_nexttoward.c (__nexttoward): Simplify
	check for NaN, optimize x==+-0 handling.
	* sysdeps/ieee754/ldbl-96/s_nexttowardf.c (__nexttowardf): Likewise.
	* sysdeps/ieee754/ldbl-96/s_nextafterl.c (__nextafterl): Simplify
	check for NaN, fix sign in x==+-0 case.
	* sysdeps/ia64/fpu/s_nexttoward.c: New.
	* sysdeps/ia64/fpu/s_nexttowardf.c: New.

2001-06-15  H.J. Lu  <hjl@gnu.org>

	* rt/tst-aio2.c (do_test): Initialize cb.aio_offset to 0.
	* rt/tst-aio3.c (do_test): Likewise.
	* rt/tst-aio4.c (do_test): Likewise.
	* rt/tst-aio5.c (do_test): Likewise.
	* rt/tst-aio6.c (do_test): Likewise.
2001-06-16 04:34:51 +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
* nexttoward(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)!=0)) /* y is nan */
return x+y;
if((long double) x==y) return y; /* x=y, return y */
if((ix|lx)==0) { /* x == 0 */
double x2;
INSERT_WORDS(x,(esy&0x8000)<<16,1); /* 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-0x3c00
|| (((ix>>20)&0x7ff)==iy-0x3c00
&& (((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-0x3c00
|| (((ix>>20)&0x7ff)==iy-0x3c00
&& (((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