1 files changed, 28 insertions, 0 deletions
diff --git a/sysdeps/ieee754/ldbl-128/s_isinfl.c b/sysdeps/ieee754/ldbl-128/s_isinfl.c
new file mode 100644
index 0000000000..038c294c79
--- /dev/null
+++ b/sysdeps/ieee754/ldbl-128/s_isinfl.c
@@ -0,0 +1,28 @@
+/*
+ * Written by J.T. Conklin <jtc@netbsd.org>.
+ * Change for long double by Jakub Jelinek <jj@ultra.linux.cz>
+ * 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)
+{
+	int64_t hx,lx;
+	GET_LDOUBLE_WORDS64(hx,lx,x);
+	lx |= (hx & 0x7fffffffffffffffLL) ^ 0x7fff000000000000LL;
+	lx |= -lx;
+	return ~(lx >> 63) & (hx >> 62);
+}
+weak_alias (__isinfl, isinfl)