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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libm/] [common/] [sf_ilogb.c] - Blame information for rev 207

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1 207 jeremybenn
/* sf_ilogb.c -- float version of s_ilogb.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 "fdlibm.h"
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#include <limits.h>
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#ifdef __STDC__
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        int ilogbf(float x)
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#else
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        int ilogbf(x)
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        float x;
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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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        hx &= 0x7fffffff;
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        if(FLT_UWORD_IS_ZERO(hx))
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            return - INT_MAX;   /* ilogb(0) = 0x80000001 */
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        if(FLT_UWORD_IS_SUBNORMAL(hx)) {
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            for (ix = -126,hx<<=8; hx>0; hx<<=1) ix -=1;
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            return ix;
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        }
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        else if (!FLT_UWORD_IS_FINITE(hx)) return INT_MAX;
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        else return (hx>>23)-127;
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}
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#ifdef _DOUBLE_IS_32BITS
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#ifdef __STDC__
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        int ilogb(double x)
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#else
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        int ilogb(x)
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        double x;
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#endif
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{
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        return ilogbf((float) x);
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}
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#endif /* defined(_DOUBLE_IS_32BITS) */

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