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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libm/] [math/] [wf_log.c] - Rev 301
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/* wf_log.c -- float version of w_log.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. * ==================================================== */ /* * wrapper logf(x) */ #include "fdlibm.h" #include <errno.h> #ifdef __STDC__ float logf(float x) /* wrapper logf */ #else float logf(x) /* wrapper logf */ float x; #endif { #ifdef _IEEE_LIBM return __ieee754_logf(x); #else float z; struct exception exc; z = __ieee754_logf(x); if(_LIB_VERSION == _IEEE_ || isnan(x) || x > (float)0.0) return z; #ifndef HUGE_VAL #define HUGE_VAL inf double inf = 0.0; SET_HIGH_WORD(inf,0x7ff00000); /* set inf to infinite */ #endif exc.name = "logf"; exc.err = 0; exc.arg1 = exc.arg2 = (double)x; if (_LIB_VERSION == _SVID_) exc.retval = -HUGE; else exc.retval = -HUGE_VAL; if(x==(float)0.0) { /* logf(0) */ exc.type = SING; if (_LIB_VERSION == _POSIX_) errno = ERANGE; else if (!matherr(&exc)) { errno = ERANGE; } } else { /* logf(x<0) */ exc.type = DOMAIN; if (_LIB_VERSION == _POSIX_) errno = EDOM; else if (!matherr(&exc)) { errno = EDOM; } exc.retval = nan(""); } if (exc.err != 0) errno = exc.err; return (float)exc.retval; #endif } #ifdef _DOUBLE_IS_32BITS #ifdef __STDC__ double log(double x) #else double log(x) double x; #endif { return (double) logf((float) x); } #endif /* defined(_DOUBLE_IS_32BITS) */
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