[Feature][ZXW-33]merge ZXW 0428 version
Change-Id: I11f167edfea428d9fab198ff00ff1364932d1b0b
diff --git a/ap/libc/glibc/glibc-2.23/math/w_tgamma.c b/ap/libc/glibc/glibc-2.23/math/w_tgamma.c
new file mode 100644
index 0000000..99b6029
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/math/w_tgamma.c
@@ -0,0 +1,46 @@
+/* @(#)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.
+ * ====================================================
+ */
+
+/* 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 <errno.h>
+#include <math.h>
+#include <math_private.h>
+
+double
+__tgamma(double x)
+{
+ int local_signgam;
+ double y = __ieee754_gamma_r(x,&local_signgam);
+
+ if(__glibc_unlikely (!isfinite (y) || y == 0)
+ && (isfinite (x) || (isinf (x) && x < 0.0))
+ && _LIB_VERSION != _IEEE_) {
+ if (x == 0.0)
+ return __kernel_standard(x,x,50); /* tgamma pole */
+ else if(__floor(x)==x&&x<0.0)
+ return __kernel_standard(x,x,41); /* tgamma domain */
+ else if (y == 0)
+ __set_errno (ERANGE); /* tgamma underflow */
+ else
+ return __kernel_standard(x,x,40); /* tgamma overflow */
+ }
+ return local_signgam < 0 ? -y : y;
+}
+weak_alias (__tgamma, tgamma)
+#ifdef NO_LONG_DOUBLE
+strong_alias (__tgamma, __tgammal)
+weak_alias (__tgamma, tgammal)
+#endif