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[/] [or1k/] [trunk/] [newlib/] [newlib/] [libm/] [common/] [sf_ilogb.c] - Rev 1767
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/* sf_ilogb.c -- float version of s_ilogb.c. * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. */ /* * ==================================================== * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. * * Developed at SunPro, a Sun Microsystems, Inc. business. * Permission to use, copy, modify, and distribute this * software is freely granted, provided that this notice * is preserved. * ==================================================== */ #include "fdlibm.h" #include <limits.h> #ifdef __STDC__ int ilogbf(float x) #else int ilogbf(x) float x; #endif { __int32_t hx,ix; GET_FLOAT_WORD(hx,x); hx &= 0x7fffffff; if(hx<0x00800000) { if(hx==0) return - INT_MAX; /* ilogb(0) = 0x80000001 */ else /* subnormal x */ for (ix = -126,hx<<=8; hx>0; hx<<=1) ix -=1; return ix; } else if (hx<0x7f800000) return (hx>>23)-127; else return INT_MAX; } #ifdef _DOUBLE_IS_32BITS #ifdef __STDC__ int ilogb(double x) #else int ilogb(x) double x; #endif { return ilogbf((float) x); } #endif /* defined(_DOUBLE_IS_32BITS) */
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