1 files changed, 29 insertions, 0 deletions
diff --git a/sysdeps/ieee754/ldbl-96/s_isinfl.c b/sysdeps/ieee754/ldbl-96/s_isinfl.c
new file mode 100644
index 0000000000..6f7c07c5af
--- /dev/null
+++ b/sysdeps/ieee754/ldbl-96/s_isinfl.c
@@ -0,0 +1,29 @@
+/*
+ * Written by J.T. Conklin <jtc@netbsd.org>.
+ * Change for long double by Ulrich Drepper <drepper@cygnus.com>.
+ * Public domain.
+ */
+
+#if defined(LIBM_SCCS) && !defined(lint)
+static char rcsid[] = "$NetBSD: $";
+#endif
+
+/*
+ * isinfl(x) returns 1 if x is inf, -1 if x is -inf, else 0;
+ * no branching!
+ */
+
+#include "math.h"
+#include "math_private.h"
+
+int
+__isinfl (long double x)
+{
+	int32_t se,hx,lx;
+	GET_LDOUBLE_WORDS(se,hx,lx,x);
+	lx |= (hx & 0x7fffffff) | ((se & 0x7fff) ^ 0x7fff);
+	lx |= -lx;
+	se &= 0x8000;
+	return ~(lx >> 31) & (1 - (se >> 14));
+}
+weak_alias (__isinfl, isinfl)