diff options
Diffstat (limited to 'libm/w_tgammaf.c')
| -rw-r--r-- | libm/w_tgammaf.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/libm/w_tgammaf.c b/libm/w_tgammaf.c new file mode 100644 index 000000000..812e7d5b6 --- /dev/null +++ b/libm/w_tgammaf.c @@ -0,0 +1,48 @@ +/* w_gammaf.c -- float version of w_gamma.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. + * ==================================================== + */ + +#include <math.h> +#include "math_private.h" +#if __UCLIBC_HAS_FENV__ +#include <errno.h> +#endif + +float +tgammaf(float x) +{ +#if __UCLIBC_HAS_FENV__ + float y = (float) __ieee754_tgamma((double)x); + + if(__builtin_expect (!isfinite (y) || y == 0, 0) + && (isfinite (x) || (isinf (x) && x < 0.0)) + && _LIB_VERSION != _IEEE_) { + if (x == (float)0.0) + /* tgammaf pole */ + return __kernel_standard_f(x, x, 150); + else if(floorf(x)==x&&x<0.0f) + /* tgammaf domain */ + return __kernel_standard_f(x, x, 141); + else if (y == 0) + /* tgammaf underflow */ + __set_errno (ERANGE); + else + /* tgammaf overflow */ + return __kernel_standard_f(x, x, 140); + } + return y; +#else + return (float) __ieee754_tgamma((double)x); +#endif /* __UCLIBC_HAS_FENV__ */ +} |