Implementation of ISO C 9x tgamma function.
authordrepper <drepper>
Tue, 28 Jul 1998 14:00:33 +0000 (14:00 +0000)
committerdrepper <drepper>
Tue, 28 Jul 1998 14:00:33 +0000 (14:00 +0000)
sysdeps/libm-ieee754/w_tgamma.c [new file with mode: 0644]
sysdeps/libm-ieee754/w_tgammaf.c [new file with mode: 0644]
sysdeps/libm-ieee754/w_tgammal.c [new file with mode: 0644]

diff --git a/sysdeps/libm-ieee754/w_tgamma.c b/sysdeps/libm-ieee754/w_tgamma.c
new file mode 100644 (file)
index 0000000..2adbc2e
--- /dev/null
@@ -0,0 +1,54 @@
+/* @(#)w_gamma.c 5.1 93/09/24 */
+/*
+ * ====================================================
+ * 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_gamma.c,v 1.7 1995/11/20 22:06:43 jtc Exp $";
+#endif
+
+/* double gamma(double x)
+ * Return  the logarithm of the Gamma function of x or the Gamma function of x,
+ * depending on the library mode.
+ */
+
+#include "math.h"
+#include "math_private.h"
+
+#ifdef __STDC__
+       double __tgamma(double x)
+#else
+       double __tgamma(x)
+       double x;
+#endif
+{
+        double y;
+       int local_signgam;
+       y = __ieee754_gamma_r(x,&local_signgam);
+       if (local_signgam < 0) y = -y;
+#ifdef _IEEE_LIBM
+       return y;
+#else
+       if(_LIB_VERSION == _IEEE_) return y;
+
+       if(!__finite(y)&&__finite(x)) {
+         if(__floor(x)==x&&x<=0.0)
+           return __kernel_standard(x,x,41); /* tgamma pole */
+         else
+           return __kernel_standard(x,x,40); /* tgamma overflow */
+       }
+       return y;
+#endif
+}
+weak_alias (__tgamma, tgamma)
+#ifdef NO_LONG_DOUBLE
+strong_alias (__tgamma, __tgammal)
+weak_alias (__tgamma, tgammal)
+#endif
diff --git a/sysdeps/libm-ieee754/w_tgammaf.c b/sysdeps/libm-ieee754/w_tgammaf.c
new file mode 100644 (file)
index 0000000..152f4be
--- /dev/null
@@ -0,0 +1,50 @@
+/* w_gammaf.c -- float version of w_gamma.c.
+ * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
+ */
+
+/*
+ * ====================================================
+ * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
+ *
+ * Developed at SunPro, a Sun Microsystems, Inc. business.
+ * Permission to use, copy, modify, and distribute this
+ * software is freely granted, provided that this notice
+ * is preserved.
+ * ====================================================
+ */
+
+#if defined(LIBM_SCCS) && !defined(lint)
+static char rcsid[] = "$NetBSD: w_gammaf.c,v 1.4 1995/11/20 22:06:48 jtc Exp $";
+#endif
+
+#include "math.h"
+#include "math_private.h"
+
+#ifdef __STDC__
+       float __tgammaf(float x)
+#else
+       float __tgammaf(x)
+       float x;
+#endif
+{
+        float y;
+       int local_signgam;
+       y = __ieee754_gammaf_r(x,&local_signgam);
+       if (local_signgam < 0) y = -y;
+#ifdef _IEEE_LIBM
+       return y;
+#else
+       if(_LIB_VERSION == _IEEE_) return y;
+
+       if(!__finitef(y)&&__finitef(x)) {
+         if(__floorf(x)==x&&x<=(float)0.0)
+           /* tgammaf pole */
+           return (float)__kernel_standard((double)x,(double)x,141);
+         else
+           /* tgammaf overflow */
+           return (float)__kernel_standard((double)x,(double)x,140);
+       }
+       return y;
+#endif
+}
+weak_alias (__tgammaf, tgammaf)
diff --git a/sysdeps/libm-ieee754/w_tgammal.c b/sysdeps/libm-ieee754/w_tgammal.c
new file mode 100644 (file)
index 0000000..9efce2b
--- /dev/null
@@ -0,0 +1,53 @@
+/* w_gammal.c -- long double version of w_gamma.c.
+ * Conversion to long double by Ulrich Drepper,
+ * Cygnus Support, drepper@cygnus.com.
+ */
+
+/*
+ * ====================================================
+ * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
+ *
+ * Developed at SunPro, a Sun Microsystems, Inc. business.
+ * Permission to use, copy, modify, and distribute this
+ * software is freely granted, provided that this notice
+ * is preserved.
+ * ====================================================
+ */
+
+#if defined(LIBM_SCCS) && !defined(lint)
+static char rcsid[] = "$NetBSD: $";
+#endif
+
+/* long double gammal(double x)
+ * Return the Gamma function of x.
+ */
+
+#include "math.h"
+#include "math_private.h"
+
+#ifdef __STDC__
+       long double __tgammal(long double x)
+#else
+       long double __tgammal(x)
+       long double x;
+#endif
+{
+        long double y;
+       int local_signgam;
+       y = __ieee754_gammal_r(x,&local_signgam);
+       if (local_signgam < 0) y = -y;
+#ifdef _IEEE_LIBM
+       return y;
+#else
+       if(_LIB_VERSION == _IEEE_) return y;
+
+       if(!__finitel(y)&&__finitel(x)) {
+         if(__floorl(x)==x&&x<=0.0)
+           return __kernel_standard(x,x,241); /* tgamma pole */
+         else
+           return __kernel_standard(x,x,240); /* tgamma overflow */
+       }
+       return y;
+#endif
+}
+weak_alias (__tgammal, tgammal)