Akos Kiss
397dff81ee
Keep IEEE code paths only:
* removed SVID, XOPEN, POSIX code paths from everywhere.
* deleted s_lib_version.c, as version is only useful if multiple
standards are supported.
* deleted k_standard.c, as it handles non-IEEE exception cases only.
* renamed the e_{acos,asin,atan2,exp,fmod,log,pow,sqrt}.c sources as
s_.*, dropped the __ieee754_ prefix from the names of the
appropriate functions therein, and deleted the
w_{acos,asin,atan2,exp,fmod,log,pow,sqrt}.c wrapper code.
Keep C99 declaration variants only:
* removed old C-style function declaration variants.
* removed data declaration variants where const qualifier was not
used.
Clean unused sources/functions:
* removed s_{rint,significand,tanh}.c and the appropriate functions
defined therein.
JerryScript-DCO-1.0-Signed-off-by: Akos Kiss akiss@inf.u-szeged.hu
30 lines
671 B
C
30 lines
671 B
C
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/* @(#)s_isnan.c 1.3 95/01/18 */
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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 SunSoft, 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 "fdlibm.h"
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int isnan(double x)
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{
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int hx,lx;
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hx = (__HI(x)&0x7fffffff);
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lx = __LO(x);
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hx |= (unsigned)(lx|(-lx))>>31;
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hx = 0x7ff00000 - hx;
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return ((unsigned)(hx))>>31;
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}
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