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add fdlibm

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git-svn-id: http://svn2.nishi.boats/svn/milsko/trunk@557 b9cfdab3-6d41-4d17-bbe4-086880011989
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Nishi 2025-11-01 15:48:47 +00:00
commit 7f523a3d76
90 changed files with 7325 additions and 309 deletions
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28
external/fdlibm/s_isnan.c vendored Normal file
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/* @(#)s_isnan.c 1.3 95/01/18 */
/*
* ====================================================
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
*
* Developed at SunSoft, a Sun Microsystems, Inc. business.
* Permission to use, copy, modify, and distribute this
* software is freely granted, provided that this notice
* is preserved.
* ====================================================
*/
/*
* isnan(x) returns 1 is x is nan, else 0;
* no branching!
*/
#include "math.h"
int isnan(double x) {
int hx, lx;
hx = (__HI(x) & 0x7fffffff);
lx = __LO(x);
hx |= (unsigned)(lx | (-lx)) >> 31;
hx = 0x7ff00000 - hx;
return ((unsigned)(hx)) >> 31;
}