auto import from //depot/cupcake/@135843

1 files changed, 51 insertions, 0 deletions

diff --git a/e_scalb.c b/e_scalb.c
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--- /dev/null
+++ b/e_scalb.c
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+
+/* @(#)e_scalb.c 1.3 95/01/18 */
+/*
+ * ====================================================
+ * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
+ *
+ * Developed at SunSoft, a Sun Microsystems, Inc. business.
+ * Permission to use, copy, modify, and distribute this
+ * software is freely granted, provided that this notice 
+ * is preserved.
+ * ====================================================
+ */
+
+/*
+ * __ieee754_scalb(x, fn) is provide for
+ * passing various standard test suite. One 
+ * should use ieee_scalbn() instead.
+ */
+
+#include "fdlibm.h"
+
+#ifdef _SCALB_INT
+#ifdef __STDC__
+	double __ieee754_scalb(double x, int fn)
+#else
+	double __ieee754_scalb(x,fn)
+	double x; int fn;
+#endif
+#else
+#ifdef __STDC__
+	double __ieee754_scalb(double x, double fn)
+#else
+	double __ieee754_scalb(x,fn)
+	double x, fn;
+#endif
+#endif
+{
+#ifdef _SCALB_INT
+	return ieee_scalbn(x,fn);
+#else
+	if (ieee_isnan(x)||ieee_isnan(fn)) return x*fn;
+	if (!ieee_finite(fn)) {
+	    if(fn>0.0) return x*fn;
+	    else       return x/(-fn);
+	}
+	if (ieee_rint(fn)!=fn) return (fn-fn)/(fn-fn);
+	if ( fn > 65000.0) return ieee_scalbn(x, 65000);
+	if (-fn > 65000.0) return ieee_scalbn(x,-65000);
+	return ieee_scalbn(x,(int)fn);
+#endif
+}