1 files changed, 36 insertions, 0 deletions
diff --git a/lib/libm/scalbf.c b/lib/libm/scalbf.c
new file mode 100644
index 00000000..7a938de2
--- /dev/null
+++ b/lib/libm/scalbf.c
@@ -0,0 +1,36 @@
+/* origin: FreeBSD /usr/src/lib/msun/src/e_scalbf.c */
+/*
+ * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@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.
+ * ====================================================
+ */
+
+#define _GNU_SOURCE
+#include <math.h>
+
+float scalbf(float x, float fn)
+{
+	if (isnan(x) || isnan(fn))
+		return x * fn;
+	if (!isfinite(fn)) {
+		if (fn > 0.0f)
+			return x * fn;
+		else
+			return x / (-fn);
+	}
+	if (rintf(fn) != fn)
+		return (fn - fn) / (fn - fn);
+	if (fn > 65000.0f)
+		return scalbnf(x, 65000);
+	if (-fn > 65000.0f)
+		return scalbnf(x, -65000);
+	return scalbnf(x, (int)fn);
+}