mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-25 12:11:10 +00:00
3e336a8754
2007-03-27 Jakub Jelinek <jakub@redhat.com> [BZ #3306] * math/math_private.h (math_opt_barrier, math_force_eval): Define. * sysdeps/i386/fpu/math_private.h: New file. * sysdeps/x86_64/fpu/math_private.h: New file. * math/s_nexttowardf.c (__nexttowardf): Use math_opt_barrier and math_force_eval macros. Use "+m" constraint on asm rather than "=m" and "m". * math/s_nextafter.c (__nextafter): Likewise. * sysdeps/ieee754/ldbl-128ibm/s_nexttoward.c (__nexttoward): Likewise. * sysdeps/ieee754/flt-32/s_nextafterf.c (__nextafterf): Likewise. * sysdeps/ieee754/ldbl-128/s_nexttoward.c (__nexttoward): Likewise. * sysdeps/ieee754/ldbl-96/s_nexttoward.c (__nexttoward): Likewise. * sysdeps/i386/fpu/s_nextafterl.c (__nextafterl): Use math_opt_barrier and math_force_eval macros. * sysdeps/ieee754/ldbl-128/s_nextafterl.c (__nextafterl): Likewise. * sysdeps/ieee754/ldbl-96/s_nextafterl.c (__nextafterl): Likewise. * sysdeps/i386/fpu/s_nexttoward.c: Include float.h. (__nexttoward): Use math_opt_barrier and math_force_eval macros. Use "+m" constraint on asm rather than "=m" and "m". Only use asm to force double result if FLT_EVAL_METHOD is 2. * sysdeps/i386/fpu/s_nexttowardf.c: Include float.h. (__nexttowardf): Use math_opt_barrier and math_force_eval macros. Use "+m" constraint on asm rather than "=m" and "m". Only use asm to force double result if FLT_EVAL_METHOD is not 0. * sysdeps/ieee754/ldbl-128ibm/s_nexttowardf.c: Include float.h. (__nexttowardf): Use math_opt_barrier and math_force_eval macros. If FLT_EVAL_METHOD is not 0, force x to float using asm. * sysdeps/ieee754/ldbl-opt/s_nexttowardfd.c: Include float.h. (__nldbl_nexttowardf): Use math_opt_barrier and math_force_eval macros. If FLT_EVAL_METHOD is not 0, force x to float using asm. * sysdeps/ieee754/ldbl-96/s_nexttowardf.c: Include float.h. (__nexttowardf): Use math_opt_barrier and math_force_eval macros. If FLT_EVAL_METHOD is not 0, force x to float using asm. * math/bug-nextafter.c (zero, inf): New variables. (main): Add new tests. * math/bug-nexttoward.c (zero, inf): New variables. (main): Add new tests.
104 lines
2.8 KiB
C
104 lines
2.8 KiB
C
/* s_nexttoward.c
|
|
* Conversion from s_nextafter.c by Ulrich Drepper, Cygnus Support,
|
|
* drepper@cygnus.com and 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.
|
|
* ====================================================
|
|
*/
|
|
|
|
#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>
|
|
#include <float.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;
|
|
int64_t hy,iy;
|
|
u_int32_t lx;
|
|
u_int64_t ly;
|
|
|
|
EXTRACT_WORDS(hx,lx,x);
|
|
GET_LDOUBLE_WORDS64(hy,ly,y);
|
|
ix = hx&0x7fffffff; /* |x| */
|
|
iy = hy&0x7fffffffffffffffLL; /* |y| */
|
|
|
|
if(((ix>=0x7ff00000)&&((ix-0x7ff00000)|lx)!=0) || /* x is nan */
|
|
((iy>=0x7fff000000000000LL)&&((iy-0x7fff000000000000LL)|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 u;
|
|
INSERT_WORDS(x,(u_int32_t)((hy>>32)&0x80000000),1);/* return +-minsub */
|
|
u = math_opt_barrier (x);
|
|
u = u * u;
|
|
math_force_eval (u); /* raise underflow flag */
|
|
return x;
|
|
}
|
|
if(hx>=0) { /* x > 0 */
|
|
if (hy<0||(ix>>20)>(iy>>48)-0x3c00
|
|
|| ((ix>>20)==(iy>>48)-0x3c00
|
|
&& (((((int64_t)hx)<<28)|(lx>>4))>(hy&0x0000ffffffffffffLL)
|
|
|| (((((int64_t)hx)<<28)|(lx>>4))==(hy&0x0000ffffffffffffLL)
|
|
&& (lx&0xf)>(ly>>60))))) { /* 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 (hy>=0||(ix>>20)>(iy>>48)-0x3c00
|
|
|| ((ix>>20)==(iy>>48)-0x3c00
|
|
&& (((((int64_t)hx)<<28)|(lx>>4))>(hy&0x0000ffffffffffffLL)
|
|
|| (((((int64_t)hx)<<28)|(lx>>4))==(hy&0x0000ffffffffffffLL)
|
|
&& (lx&0xf)>(ly>>60))))) { /* 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) {
|
|
x = x+x; /* overflow */
|
|
if (FLT_EVAL_METHOD != 0 && FLT_EVAL_METHOD != 1)
|
|
/* Force conversion to double. */
|
|
asm ("" : "+m"(x));
|
|
return x;
|
|
}
|
|
if(hy<0x00100000) {
|
|
double u = x*x; /* underflow */
|
|
math_force_eval (u); /* raise underflow flag */
|
|
}
|
|
INSERT_WORDS(x,hx,lx);
|
|
return x;
|
|
}
|
|
weak_alias (__nexttoward, nexttoward)
|