diff options
Diffstat (limited to 'sysdeps/generic/w_powf.c')
| -rw-r--r-- | sysdeps/generic/w_powf.c | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/sysdeps/generic/w_powf.c b/sysdeps/generic/w_powf.c new file mode 100644 index 0000000000..32196fd89f --- /dev/null +++ b/sysdeps/generic/w_powf.c @@ -0,0 +1,77 @@ +/* w_powf.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. + * ==================================================== + */ + +#if defined(LIBM_SCCS) && !defined(lint) +static char rcsid[] = "$NetBSD: w_powf.c,v 1.3 1995/05/10 20:49:41 jtc Exp $"; +#endif + +/* + * wrapper powf(x,y) return x**y + */ + +#include "math.h" +#include "math_private.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; + 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) */ + return (float)__kernel_standard((double)x,(double)y,142); + else + return z; + } + if(x==(float)0.0) { + if(y==(float)0.0) + /* powf(0.0,0.0) */ + return (float)__kernel_standard((double)x,(double)y,120); + if(__finitef(y)&&y<(float)0.0) { + if (signbit (x) && signbit (z)) + /* powf(0.0,negative) */ + return (float)__kernel_standard((double)x,(double)y,123); + else + return (float)__kernel_standard((double)x,(double)y,143); + } + return z; + } + if(!__finitef(z)) { + if(__finitef(x)&&__finitef(y)) { + if(__isnanf(z)) + /* powf neg**non-int */ + return (float)__kernel_standard((double)x,(double)y,124); + else + /* powf overflow */ + return (float)__kernel_standard((double)x,(double)y,121); + } + } + if(z==(float)0.0&&__finitef(x)&&__finitef(y)) + /* powf underflow */ + return (float)__kernel_standard((double)x,(double)y,122); + return z; +#endif +} +weak_alias (__powf, powf) |