8303799: [BACKOUT] JDK-8302801 Remove fdlibm C sources

Reviewed-by: darcy, bpb

src/java.base/share/native/libfdlibm/w_scalb.c

@@ -0,0 +1,69 @@
+
+/*
+ * Copyright (c) 1998, 2001, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * wrapper scalb(double x, double fn) is provide for
+ * passing various standard test suite. One
+ * should use scalbn() instead.
+ */
+
+#include "fdlibm.h"
+
+#include <errno.h>
+
+#ifdef __STDC__
+#ifdef _SCALB_INT
+        double scalb(double x, int fn)          /* wrapper scalb */
+#else
+        double scalb(double x, double fn)       /* wrapper scalb */
+#endif
+#else
+        double scalb(x,fn)                      /* wrapper scalb */
+#ifdef _SCALB_INT
+        double x; int fn;
+#else
+        double x,fn;
+#endif
+#endif
+{
+#ifdef _IEEE_LIBM
+        return __ieee754_scalb(x,fn);
+#else
+        double z;
+        z = __ieee754_scalb(x,fn);
+        if(_LIB_VERSION == _IEEE_) return z;
+        if(!(finite(z)||isnan(z))&&finite(x)) {
+            return __kernel_standard(x,(double)fn,32); /* scalb overflow */
+        }
+        if(z==0.0&&z!=x) {
+            return __kernel_standard(x,(double)fn,33); /* scalb underflow */
+        }
+#ifndef _SCALB_INT
+        if(!finite(fn)) errno = ERANGE;
+#endif
+        return z;
+#endif
+}