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[/] [openrisc/] [trunk/] [gnu-old/] [newlib-1.17.0/] [newlib/] [libm/] [math/] [wf_pow.c] - Rev 148
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/* wf_pow.c -- float version of w_pow.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 powf(x,y) return x**y */ #include "fdlibm.h" #include <errno.h> #ifdef __STDC__ float powf(float x, float y) /* wrapper powf */ #else float powf(x,y) /* wrapper powf */ float x,y; #endif { #ifdef _IEEE_LIBM return __ieee754_powf(x,y); #else float z; struct exception exc; z=__ieee754_powf(x,y); if(_LIB_VERSION == _IEEE_|| isnanf(y)) return z; if(isnanf(x)) { if(y==(float)0.0) { /* powf(NaN,0.0) */ /* error only if _LIB_VERSION == _SVID_ & _XOPEN_ */ exc.type = DOMAIN; exc.name = "powf"; exc.err = 0; exc.arg1 = (double)x; exc.arg2 = (double)y; exc.retval = 1.0; if (_LIB_VERSION == _IEEE_ || _LIB_VERSION == _POSIX_) exc.retval = 1.0; else if (!matherr(&exc)) { errno = EDOM; } if (exc.err != 0) errno = exc.err; return (float)exc.retval; } else return z; } if(x==(float)0.0){ if(y==(float)0.0) { /* powf(0.0,0.0) */ /* error only if _LIB_VERSION == _SVID_ */ exc.type = DOMAIN; exc.name = "powf"; exc.err = 0; exc.arg1 = (double)x; exc.arg2 = (double)y; exc.retval = 0.0; if (_LIB_VERSION != _SVID_) exc.retval = 1.0; else if (!matherr(&exc)) { errno = EDOM; } if (exc.err != 0) errno = exc.err; return (float)exc.retval; } if(finitef(y)&&y<(float)0.0) { /* 0**neg */ exc.type = DOMAIN; exc.name = "powf"; exc.err = 0; exc.arg1 = (double)x; exc.arg2 = (double)y; if (_LIB_VERSION == _SVID_) exc.retval = 0.0; else exc.retval = -HUGE_VAL; if (_LIB_VERSION == _POSIX_) errno = EDOM; else if (!matherr(&exc)) { errno = EDOM; } if (exc.err != 0) errno = exc.err; return (float)exc.retval; } return z; } if(!finitef(z)) { if(finitef(x)&&finitef(y)) { if(isnanf(z)) { /* neg**non-integral */ exc.type = DOMAIN; exc.name = "powf"; exc.err = 0; exc.arg1 = (double)x; exc.arg2 = (double)y; if (_LIB_VERSION == _SVID_) exc.retval = 0.0; else exc.retval = 0.0/0.0; /* X/Open allow NaN */ if (_LIB_VERSION == _POSIX_) errno = EDOM; else if (!matherr(&exc)) { errno = EDOM; } if (exc.err != 0) errno = exc.err; return (float)exc.retval; } else { /* powf(x,y) overflow */ exc.type = OVERFLOW; exc.name = "powf"; exc.err = 0; exc.arg1 = (double)x; exc.arg2 = (double)y; if (_LIB_VERSION == _SVID_) { exc.retval = HUGE; y *= 0.5; if(x<0.0&&rint(y)!=y) exc.retval = -HUGE; } else { exc.retval = HUGE_VAL; y *= 0.5; if(x<0.0&&rint(y)!=y) exc.retval = -HUGE_VAL; } if (_LIB_VERSION == _POSIX_) errno = ERANGE; else if (!matherr(&exc)) { errno = ERANGE; } if (exc.err != 0) errno = exc.err; return (float)exc.retval; } } } if(z==(float)0.0&&finitef(x)&&finitef(y)) { /* powf(x,y) underflow */ exc.type = UNDERFLOW; exc.name = "powf"; exc.err = 0; exc.arg1 = (double)x; exc.arg2 = (double)y; exc.retval = 0.0; if (_LIB_VERSION == _POSIX_) errno = ERANGE; else if (!matherr(&exc)) { errno = ERANGE; } if (exc.err != 0) errno = exc.err; return (float)exc.retval; } return z; #endif } #ifdef _DOUBLE_IS_32BITS #ifdef __STDC__ double pow(double x, double y) #else double pow(x,y) double x,y; #endif { return (double) powf((float) x, (float) y); } #endif /* defined(_DOUBLE_IS_32BITS) */
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