import newlib-2000-02-17 snapshot

1 files changed, 53 insertions, 0 deletions

diff --git a/newlib/libm/math/ef_scalb.c b/newlib/libm/math/ef_scalb.c
new file mode 100644
index 000000000..3677a3b1f
--- /dev/null
+++ b/newlib/libm/math/ef_scalb.c
@@ -0,0 +1,53 @@
+/* ef_scalb.c -- float version of e_scalb.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 "fdlibm.h"
+#include <limits.h>
+
+#ifdef _SCALB_INT
+#ifdef __STDC__
+	float __ieee754_scalbf(float x, int fn)
+#else
+	float __ieee754_scalbf(x,fn)
+	float x; int fn;
+#endif
+#else
+#ifdef __STDC__
+	float __ieee754_scalbf(float x, float fn)
+#else
+	float __ieee754_scalbf(x,fn)
+	float x, fn;
+#endif
+#endif
+{
+#ifdef _SCALB_INT
+	return scalbnf(x,fn);
+#else
+	if (isnanf(x)||isnanf(fn)) return x*fn;
+	if (!finitef(fn)) {
+	    if(fn>(float)0.0) return x*fn;
+	    else       return x/(-fn);
+	}
+	if (rintf(fn)!=fn) return (fn-fn)/(fn-fn);
+#if INT_MAX > 65000
+	if ( fn > (float)65000.0) return scalbnf(x, 65000);
+	if (-fn > (float)65000.0) return scalbnf(x,-65000);
+#else
+	if ( fn > (float)32000.0) return scalbnf(x, 32000);
+	if (-fn > (float)32000.0) return scalbnf(x,-32000);
+#endif
+	return scalbnf(x,(int)fn);
+#endif
+}