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diff --git a/sysdeps/libm-ieee754/s_isnanl.c b/sysdeps/libm-ieee754/s_isnanl.c
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+/* s_isnanl.c -- long double version of s_isnan.c.
+ * Conversion to long double by Ulrich Drepper,
+ * Cygnus Support, drepper@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.
+ * ====================================================
+ */
+
+#if defined(LIBM_SCCS) && !defined(lint)
+static char rcsid[] = "$NetBSD: $";
+#endif
+
+/*
+ * isnanl(x) returns 1 is x is nan, else 0;
+ * no branching!
+ */
+
+#include "math.h"
+#include "math_private.h"
+
+#ifdef __STDC__
+ int __isnanl(long double x)
+#else
+ int __isnanl(x)
+ long double x;
+#endif
+{
+ int32_t se,hx,lx;
+ GET_LDOUBLE_WORDS(se,hx,lx,x);
+ se = (se & 0x7fff) << 1;
+ hx |= lx;
+ se |= (u_int32_t)(hx|(-hx))>>31;
+ se = 0xfffe - se;
+ return (int)((u_int32_t)(se))>>16;
+}
+weak_alias (__isnanl, isnanl)