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[/] [openrisc/] [trunk/] [gnu-old/] [newlib-1.17.0/] [newlib/] [libm/] [common/] [sf_logb.c] - Blame information for rev 816

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Line No. Rev Author Line
1 148 jeremybenn
/* sf_logb.c -- float version of s_logb.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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#ifdef __STDC__
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        float logbf(float x)
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#else
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        float logbf(x)
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        float x;
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#endif
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{
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        __int32_t ix;
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        GET_FLOAT_WORD(ix,x);
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        ix &= 0x7fffffff;                       /* high |x| */
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        if(FLT_UWORD_IS_ZERO(ix)) return (float)-1.0/fabsf(x);
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        if(!FLT_UWORD_IS_FINITE(ix)) return x*x;
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        if((ix>>=23)==0)                         /* IEEE 754 logb */
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                return -126.0;
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        else
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                return (float) (ix-127);
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}
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#ifdef _DOUBLE_IS_32BITS
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#ifdef __STDC__
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        double logb(double x)
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#else
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        double logb(x)
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        double x;
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#endif
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{
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        return (double) logbf((float) x);
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}
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#endif /* defined(_DOUBLE_IS_32BITS) */

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