45 lines
1.1 KiB
C
45 lines
1.1 KiB
C
/* 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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#include "cdefs-compat.h"
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//__FBSDID("$FreeBSD: src/lib/msun/src/s_frexpf.c,v 1.10 2008/02/22 02:30:35 das Exp $");
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#include <openlibm_math.h>
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#include "math_private.h"
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static const float
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two25 = 3.3554432000e+07; /* 0x4c000000 */
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OLM_DLLEXPORT float
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frexpf(float x, int *eptr)
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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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SET_FLOAT_WORD(x,hx);
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return x;
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}
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