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| author | Ulrich Drepper <drepper@gmail.com> | 2011-10-12 11:27:51 -0400 |
|---|---|---|
| committer | Ulrich Drepper <drepper@gmail.com> | 2011-10-12 11:27:51 -0400 |
| commit | 0ac5ae2335292908f39031b1ea9fe8edce433c0f (patch) | |
| tree | f9d26c8abc0de39d18d4c13e70f6022cdc6b461f /math/w_tgamma.c | |
| parent | a843a204a3e8a0dd53584dad3668771abaec84ac (diff) | |
| download | glibc-0ac5ae2335292908f39031b1ea9fe8edce433c0f.tar.gz glibc-0ac5ae2335292908f39031b1ea9fe8edce433c0f.tar.xz glibc-0ac5ae2335292908f39031b1ea9fe8edce433c0f.zip | |
Optimize libm
libm is now somewhat integrated with gcc's -ffinite-math-only option and lots of the wrapper functions have been optimized.
Diffstat (limited to 'math/w_tgamma.c')
| -rw-r--r-- | math/w_tgamma.c | 26 |
1 files changed, 6 insertions, 20 deletions
diff --git a/math/w_tgamma.c b/math/w_tgamma.c index 14d6855829..976b5fb95c 100644 --- a/math/w_tgamma.c +++ b/math/w_tgamma.c @@ -10,10 +10,6 @@ * ==================================================== */ -#if defined(LIBM_SCCS) && !defined(lint) -static char rcsid[] = "$NetBSD: w_gamma.c,v 1.7 1995/11/20 22:06:43 jtc Exp $"; -#endif - /* double gamma(double x) * Return the logarithm of the Gamma function of x or the Gamma function of x, * depending on the library mode. @@ -22,23 +18,14 @@ static char rcsid[] = "$NetBSD: w_gamma.c,v 1.7 1995/11/20 22:06:43 jtc Exp $"; #include <math.h> #include <math_private.h> -#ifdef __STDC__ - double __tgamma(double x) -#else - double __tgamma(x) - double x; -#endif +double +__tgamma(double x) { - double y; int local_signgam; - y = __ieee754_gamma_r(x,&local_signgam); - if (local_signgam < 0) y = -y; -#ifdef _IEEE_LIBM - return y; -#else - if(_LIB_VERSION == _IEEE_) return y; + double y = __ieee754_gamma_r(x,&local_signgam); - if(!__finite(y)&&__finite(x)) { + if(__builtin_expect(!__finite(y), 0)&&__finite(x) + && _LIB_VERSION != _IEEE_) { if (x == 0.0) return __kernel_standard(x,x,50); /* tgamma pole */ else if(__floor(x)==x&&x<0.0) @@ -46,8 +33,7 @@ static char rcsid[] = "$NetBSD: w_gamma.c,v 1.7 1995/11/20 22:06:43 jtc Exp $"; else return __kernel_standard(x,x,40); /* tgamma overflow */ } - return y; -#endif + return local_signgam < 0 ? -y : y; } weak_alias (__tgamma, tgamma) #ifdef NO_LONG_DOUBLE |