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[/] [openrisc/] [trunk/] [gnu-old/] [newlib-1.17.0/] [newlib/] [libm/] [common/] [sf_logb.c] - Rev 158
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/* sf_logb.c -- float version of s_logb.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" #ifdef __STDC__ float logbf(float x) #else float logbf(x) float x; #endif { __int32_t ix; GET_FLOAT_WORD(ix,x); ix &= 0x7fffffff; /* high |x| */ if(FLT_UWORD_IS_ZERO(ix)) return (float)-1.0/fabsf(x); if(!FLT_UWORD_IS_FINITE(ix)) return x*x; if((ix>>=23)==0) /* IEEE 754 logb */ return -126.0; else return (float) (ix-127); } #ifdef _DOUBLE_IS_32BITS #ifdef __STDC__ double logb(double x) #else double logb(x) double x; #endif { return (double) logbf((float) x); } #endif /* defined(_DOUBLE_IS_32BITS) */
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