1 files changed, 36 insertions, 0 deletions
diff --git a/sysdeps/libm-i387/s_isinfl.c b/sysdeps/libm-i387/s_isinfl.c
new file mode 100644
index 0000000000..3ee53d5ecc
--- /dev/null
+++ b/sysdeps/libm-i387/s_isinfl.c
@@ -0,0 +1,36 @@
+/*
+ * Written by J.T. Conklin <jtc@netbsd.org>.
+ * Change for long double by Ulrich Drepper <drepper@cygnus.com>.
+ * Intel i387 specific version.
+ * Public domain.
+ */
+
+#if defined(LIBM_SCCS) && !defined(lint)
+static char rcsid[] = "$NetBSD: $";
+#endif
+
+/*
+ * isinfl(x) returns 1 is x is inf, else 0;
+ * no branching!
+ */
+
+#include "math.h"
+#include "math_private.h"
+
+#ifdef __STDC__
+	int __isinfl(long double x)
+#else
+	int __isinfl(x)
+	long double x;
+#endif
+{
+	int32_t se,hx,lx;
+	GET_LDOUBLE_WORDS(se,hx,lx,x);
+	se &= 0x7fff;
+	se ^= 0x7fff;
+	/* This additional ^ 0x80000000 is necessary because in Intel's
+	   internal representation the implicit one is explicit.  */
+	se |= (hx ^ 0x80000000) | lx;
+	return (se == 0);
+}
+weak_alias (__isinfl, isinfl)