mirror of
https://sourceware.org/git/glibc.git
synced 2024-09-28 18:17:45 +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.
88 lines
2.3 KiB
C
88 lines
2.3 KiB
C
/* s_nexttowardf.c -- float version of s_nextafter.c.
|
|
* Special i387 version.
|
|
* Conversion to float by Ian Lance Taylor, Cygnus Support, ian@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
|
|
|
|
#include "math.h"
|
|
#include <math_private.h>
|
|
#include <float.h>
|
|
|
|
#ifdef __STDC__
|
|
float __nexttowardf(float x, long double y)
|
|
#else
|
|
float __nexttowardf(x,y)
|
|
float x;
|
|
long double y;
|
|
#endif
|
|
{
|
|
int32_t hx,ix,iy;
|
|
u_int32_t hy,ly,esy;
|
|
|
|
GET_FLOAT_WORD(hx,x);
|
|
GET_LDOUBLE_WORDS(esy,hy,ly,y);
|
|
ix = hx&0x7fffffff; /* |x| */
|
|
iy = esy&0x7fff; /* |y| */
|
|
|
|
/* Intel's extended format has the normally implicit 1 explicit
|
|
present. Sigh! */
|
|
if((ix>0x7f800000) || /* x is nan */
|
|
(iy>=0x7fff&&(((hy&0x7fffffff)|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 u;
|
|
SET_FLOAT_WORD(x,((esy&0x8000)<<16)|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(esy>=0x8000||((ix>>23)&0xff)>iy-0x3f80
|
|
|| (((ix>>23)&0xff)==iy-0x3f80
|
|
&& ((ix&0x7fffff)<<8)>(hy&0x7fffffff))) {/* x > y, x -= ulp */
|
|
hx -= 1;
|
|
} else { /* x < y, x += ulp */
|
|
hx += 1;
|
|
}
|
|
} else { /* x < 0 */
|
|
if(esy<0x8000||((ix>>23)&0xff)>iy-0x3f80
|
|
|| (((ix>>23)&0xff)==iy-0x3f80
|
|
&& ((ix&0x7fffff)<<8)>(hy&0x7fffffff))) {/* x < y, x -= ulp */
|
|
hx -= 1;
|
|
} else { /* x > y, x += ulp */
|
|
hx += 1;
|
|
}
|
|
}
|
|
hy = hx&0x7f800000;
|
|
if(hy>=0x7f800000) {
|
|
x = x+x; /* overflow */
|
|
if (FLT_EVAL_METHOD != 0)
|
|
/* Force conversion to float. */
|
|
asm ("" : "+m"(x));
|
|
return x;
|
|
}
|
|
if(hy<0x00800000) {
|
|
float u = x*x; /* underflow */
|
|
math_force_eval (u); /* raise underflow flag */
|
|
}
|
|
SET_FLOAT_WORD(x,hx);
|
|
return x;
|
|
}
|
|
weak_alias (__nexttowardf, nexttowardf)
|