forked from KolibriOS/kolibrios
6496d04506
This version of menuetlibc was taken from revision 4743, right before I made any changes git-svn-id: svn://kolibrios.org@4973 a494cfbc-eb01-0410-851d-a64ba20cac60
55 lines
1.3 KiB
C
55 lines
1.3 KiB
C
/* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */
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/* s_frexpf.c -- float version of s_frexp.c.
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* Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
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*/
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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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#if defined(LIBM_SCCS) && !defined(lint)
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static char rcsid[] = "$Id: s_frexpf.c,v 1.2 1994/08/18 23:06:51 jtc Exp $";
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#endif
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#include "math.h"
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#include "math_private.h"
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#ifdef __STDC__
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static const float
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#else
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static float
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#endif
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one = 1.0000000000e+00, /* 0x3F800000 */
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two25 = 3.3554432000e+07; /* 0x4c000000 */
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#ifdef __STDC__
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float frexpf(float x, int *eptr)
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#else
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float frexpf(x, eptr)
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float x; int *eptr;
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#endif
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{
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int32_t hx,ix;
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GET_FLOAT_WORD(hx,x);
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ix = 0x7fffffff&hx;
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*eptr = 0;
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if(ix>=0x7f800000||(ix==0)) return x; /* 0,inf,nan */
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if (ix<0x00800000) { /* subnormal */
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x *= two25;
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GET_FLOAT_WORD(hx,x);
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ix = hx&0x7fffffff;
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*eptr = -25;
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}
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*eptr += (ix>>23)-126;
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hx = (hx&0x807fffff)|0x3f000000;
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*(int*)&x = hx;
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return x;
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}
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