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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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41
external/fdlibm/s_ilogb.c vendored Normal file
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/* @(#)s_ilogb.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.
* ====================================================
*/
/* ilogb(double x)
* return the binary exponent of non-zero x
* ilogb(0) = 0x80000001
* ilogb(inf/NaN) = 0x7fffffff (no signal is raised)
*/
#include "math.h"
int ilogb(double x) {
int hx, lx, ix;
hx = (__HI(x)) & 0x7fffffff; /* high word of x */
if(hx < 0x00100000) {
lx = __LO(x);
if((hx | lx) == 0)
return 0x80000001; /* ilogb(0) = 0x80000001 */
else /* subnormal x */
if(hx == 0) {
for(ix = -1043; lx > 0; lx <<= 1) ix -= 1;
} else {
for(ix = -1022, hx <<= 11; hx > 0; hx <<= 1) ix -= 1;
}
return ix;
} else if(hx < 0x7ff00000)
return (hx >> 20) - 1023;
else
return 0x7fffffff;
}