diff options
Diffstat (limited to 'newlib/libm/math/wf_pow.c')
| -rw-r--r-- | newlib/libm/math/wf_pow.c | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/newlib/libm/math/wf_pow.c b/newlib/libm/math/wf_pow.c new file mode 100644 index 00000000000..42655da4a2a --- /dev/null +++ b/newlib/libm/math/wf_pow.c @@ -0,0 +1,179 @@ +/* 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 = x; + 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) */ |