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, 37 insertions, 0 deletions

diff --git a/libm/w_hypotf.c b/libm/w_hypotf.c
new file mode 100644
index 000000000..f6087174a
--- /dev/null
+++ b/libm/w_hypotf.c
@@ -0,0 +1,37 @@
+/* w_hypotf.c -- float version of w_hypot.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.
+ * ====================================================
+ */
+
+/*
+ * wrapper hypotf(x,y)
+ */
+
+#include <math.h>
+#include "math_private.h"
+
+float
+hypotf(float x, float y)
+{
+#if __UCLIBC_HAS_FENV__
+	float z = (float) __ieee754_hypot((double) x, (double) y);
+	if(__builtin_expect(!isfinite(z), 0)
+	   && isfinite(x) && isfinite(y) && _LIB_VERSION != _IEEE_)
+	    /* hypot overflow */
+	    return __kernel_standard_f(x, y, 104);
+
+	return z;
+#else
+	return (float) __ieee754_hypot((double) x, (double) y);
+#endif
+}
\ No newline at end of file