math: add exception handling functionality

According to standards SVID and SYSV.
Modified lgamma calling in case when 'signgam' variable should not be used.

Signed-off-by: Waldemar Brodkorb <wbx@uclibc-ng.org>

1 files changed, 34 insertions, 0 deletions

diff --git a/libm/w_cosh.c b/libm/w_cosh.c
new file mode 100644
index 000000000..d9a6da3df
--- /dev/null
+++ b/libm/w_cosh.c
@@ -0,0 +1,34 @@
+/* Optimizations bu Ulrich Drepper <drepper@gmail.com>, 2011 */
+/*
+ * ====================================================
+ * 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.
+ * ====================================================
+ */
+
+/*
+ * wrapper cosh(x)
+ */
+
+#include <math.h>
+#include "math_private.h"
+
+double
+cosh (double x)
+{
+#if __UCLIBC_HAS_FENV__
+	double z = __ieee754_cosh (x);
+	if (__builtin_expect (!isfinite (z), 0) && isfinite (x)
+	    && _LIB_VERSION != _IEEE_)
+		return __kernel_standard (x, x, 5); /* cosh overflow */
+
+	return z;
+#else
+	return __ieee754_cosh (x);
+#endif
+}
+libm_hidden_def(cosh)