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Diffstat (limited to 'sysdeps/i386/fpu/s_isnanl.c')
-rw-r--r--sysdeps/i386/fpu/s_isnanl.c47
1 files changed, 47 insertions, 0 deletions
diff --git a/sysdeps/i386/fpu/s_isnanl.c b/sysdeps/i386/fpu/s_isnanl.c
new file mode 100644
index 0000000000..6a74b956cc
--- /dev/null
+++ b/sysdeps/i386/fpu/s_isnanl.c
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+/* s_isnanl.c -- long double version for i387 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;
+	/* The additional & 0x7fffffff is required because Intel's
+	   extended format has the normally implicit 1 explicit
+	   present.  Sigh!  */
+	lx |= hx & 0x7fffffff;
+	se |= (u_int32_t)(lx|(-lx))>>31;
+	se = 0xfffe - se;
+	return (int)((u_int32_t)(se))>>16;
+}
+weak_alias (__isnanl, isnanl)