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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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32
external/fdlibm/s_logb.c vendored Normal file
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/* @(#)s_logb.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.
* ====================================================
*/
/*
* double logb(x)
* IEEE 754 logb. Included to pass IEEE test suite. Not recommend.
* Use ilogb instead.
*/
#include "math.h"
double logb(double x) {
int lx, ix;
ix = (__HI(x)) & 0x7fffffff; /* high |x| */
lx = __LO(x); /* low x */
if((ix | lx) == 0) return -1.0 / fabs(x);
if(ix >= 0x7ff00000) return x * x;
if((ix >>= 20) == 0) /* IEEE 754 logb */
return -1022.0;
else
return (double)(ix - 1023);
}