mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-24 19:51:11 +00:00
e59c94fa0e
If a platform does not define "long-double-fcts = yes" in its Makefiles and it does define __NO_LONG_DOUBLE_MATH in its installed headers, it will currently create exported symbols for __finitel, __isinfl, and __isnanl that can't be reached from userspace by correct use of the finite(), isinf(), or isnan() macros in <math.h>. To avoid this situation, by default for such platforms we now no longer export these symbols, thus causing appropriate link-time errors. However, for platforms that previously exported these symbols, we continue to do so as compat symbols; this is enabled by adding LDBL_CLASSIFY_COMPAT to math_private.h for the platform. For tile, remove the now-unnecessary exports of those functions from libc and libm.
45 lines
1.1 KiB
C
45 lines
1.1 KiB
C
/* @(#)s_isnan.c 5.1 93/09/24 */
|
|
/*
|
|
* ====================================================
|
|
* 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: s_isnan.c,v 1.8 1995/05/10 20:47:36 jtc Exp $";
|
|
#endif
|
|
|
|
/*
|
|
* isnan(x) returns 1 is x is nan, else 0;
|
|
* no branching!
|
|
*/
|
|
|
|
#include <math.h>
|
|
#include <math_private.h>
|
|
#include <shlib-compat.h>
|
|
|
|
#undef __isnan
|
|
int
|
|
__isnan (double x)
|
|
{
|
|
int32_t hx, lx;
|
|
EXTRACT_WORDS (hx, lx, x);
|
|
hx &= 0x7fffffff;
|
|
hx |= (u_int32_t) (lx | (-lx)) >> 31;
|
|
hx = 0x7ff00000 - hx;
|
|
return (int) (((u_int32_t) hx) >> 31);
|
|
}
|
|
hidden_def (__isnan)
|
|
weak_alias (__isnan, isnan)
|
|
#ifdef NO_LONG_DOUBLE
|
|
# if defined LDBL_CLASSIFY_COMPAT && SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_23)
|
|
compat_symbol (libc, __isnan, __isnanl, GLIBC_2_0);
|
|
# endif
|
|
weak_alias (__isnan, isnanl)
|
|
#endif
|