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.
40 lines
1011 B
C
40 lines
1011 B
C
/* @(#)s_isnan.c 5.1 93/09/24 */
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/*
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* ====================================================
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunPro, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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* ====================================================
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*/
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/*
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* isnan(x) returns 1 is x is nan, else 0;
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* no branching!
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*/
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#include <math.h>
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#include <math_private.h>
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#include <shlib-compat.h>
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#include <stdint.h>
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#undef __isnan
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int __isnan(double x)
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{
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int64_t hx;
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EXTRACT_WORDS64(hx,x);
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hx &= UINT64_C(0x7fffffffffffffff);
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hx = UINT64_C(0x7ff0000000000000) - hx;
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return (int)(((uint64_t)hx)>>63);
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}
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hidden_def (__isnan)
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weak_alias (__isnan, isnan)
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#ifdef NO_LONG_DOUBLE
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# if defined LDBL_CLASSIFY_COMPAT && SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_23)
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compat_symbol (libc, __isnan, __isnanl, GLIBC_2_0);
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# endif
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weak_alias (__isnan, isnanl)
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#endif
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