glibc/sysdeps/generic/s_nexttowardf.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

80 lines
2.2 KiB
C

/* Single precision version of nexttoward.c.
Conversion to IEEE single float 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.
* ====================================================
*/
/* IEEE functions
* nexttowardf(x,y)
* return the next machine floating-point number of x in the
* direction toward y.
* This is for machines which use the same binary type for double and
* long double.
* Special cases:
*/
#include "math.h"
#include "math_private.h"
#ifdef __STDC__
float __nexttowardf(float x, long double y)
#else
float __nexttowardf(x,y)
float x;
long double y;
#endif
{
int32_t hx,hy,ix,iy;
u_int32_t ly;
GET_FLOAT_WORD(hx,x);
EXTRACT_WORDS(hy,ly,y);
ix = hx&0x7fffffff; /* |x| */
iy = hy&0x7fffffff; /* |y| */
if((ix>0x7f800000) || /* x is nan */
((iy>=0x7ff00000)&&((iy-0x7ff00000)|ly)!=0)) /* y is nan */
return x+y;
if((long double) x==y) return y; /* x=y, return y */
if(ix==0) { /* x == 0 */
float x2;
SET_FLOAT_WORD(x,(u_int32_t)(hy&0x80000000)|1);/* return +-minsub*/
x2 = x*x;
if(x2==x) return x2; else return x; /* raise underflow flag */
}
if(hx>=0) { /* x > 0 */
if(hy<0||(ix>>23)>(iy>>20)-0x380
|| ((ix>>23)==(iy>>20)-0x380
&& (ix&0x7fffff)>(((hy<<3)|(ly>>29))&0x7fffff))) /* x > y, x -= ulp */
hx -= 1;
else /* x < y, x += ulp */
hx += 1;
} else { /* x < 0 */
if(hy>=0||(ix>>23)>(iy>>20)-0x380
|| ((ix>>23)==(iy>>20)-0x380
&& (ix&0x7fffff)>(((hy<<3)|(ly>>29))&0x7fffff))) /* x < y, x -= ulp */
hx -= 1;
else /* x > y, x += ulp */
hx += 1;
}
hy = hx&0x7f800000;
if(hy>=0x7f800000) return x+x; /* overflow */
if(hy<0x00800000) { /* underflow */
float x2 = x*x;
if(x2!=x) { /* raise underflow flag */
SET_FLOAT_WORD(x2,hx);
return x2;
}
}
SET_FLOAT_WORD(x,hx);
return x;
}
weak_alias (__nexttowardf, nexttowardf)