first commit of the new libm!

[musl] / src / math / scalbf.c

diff --git a/src/math/scalbf.c b/src/math/scalbf.c
new file mode 100644 (file)
index 0000000..0cc091f
--- /dev/null
+++ b/src/math/scalbf.c
@@ -0,0 +1,31 @@
+/* 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.
+ * ====================================================
+ */
+
+#include "libm.h"
+
+float scalbf(float x, float fn)
+{
+       if (isnan(x) || isnan(fn)) return x*fn;
+       if (!isfinite(fn)) {
+               if (fn > (float)0.0)
+                       return x*fn;
+               else
+                       return x/(-fn);
+       }
+       if (rintf(fn) != fn) return (fn-fn)/(fn-fn);
+       if ( fn > (float)65000.0) return scalbnf(x, 65000);
+       if (-fn > (float)65000.0) return scalbnf(x,-65000);
+       return scalbnf(x,(int)fn);
+}