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[/] [or1k/] [trunk/] [newlib/] [newlib/] [libm/] [math/] [wf_exp.c] - Rev 57
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/* wf_exp.c -- float version of w_exp.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 expf(x) */ #include "fdlibm.h" #include <errno.h> #ifdef __STDC__ static const float #else static float #endif o_threshold= 8.8721679688e+01, /* 0x42b17180 */ u_threshold= -1.0397208405e+02; /* 0xc2cff1b5 */ #ifdef __STDC__ float expf(float x) /* wrapper expf */ #else float expf(x) /* wrapper expf */ float x; #endif { #ifdef _IEEE_LIBM return __ieee754_expf(x); #else float z; struct exception exc; z = __ieee754_expf(x); if(_LIB_VERSION == _IEEE_) return z; if(finitef(x)) { if(x>o_threshold) { /* expf(finite) overflow */ #ifndef HUGE_VAL #define HUGE_VAL inf double inf = 0.0; SET_HIGH_WORD(inf,0x7ff00000); /* set inf to infinite */ #endif exc.type = OVERFLOW; exc.name = "expf"; exc.err = 0; exc.arg1 = exc.arg2 = (double)x; if (_LIB_VERSION == _SVID_) exc.retval = HUGE; else exc.retval = HUGE_VAL; if (_LIB_VERSION == _POSIX_) errno = ERANGE; else if (!matherr(&exc)) { errno = ERANGE; } if (exc.err != 0) errno = exc.err; return exc.retval; } else if(x<u_threshold) { /* expf(finite) underflow */ exc.type = UNDERFLOW; exc.name = "expf"; exc.err = 0; exc.arg1 = exc.arg2 = (double)x; exc.retval = 0.0; if (_LIB_VERSION == _POSIX_) errno = ERANGE; else if (!matherr(&exc)) { errno = ERANGE; } if (exc.err != 0) errno = exc.err; return exc.retval; } } return z; #endif } #ifdef _DOUBLE_IS_32BITS #ifdef __STDC__ double exp(double x) #else double exp(x) double x; #endif { return (double) expf((float) x); } #endif /* defined(_DOUBLE_IS_32BITS) */
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