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authorJakub Jelinek <jakub@redhat.com>2007-07-12 18:26:36 +0000
committerJakub Jelinek <jakub@redhat.com>2007-07-12 18:26:36 +0000
commit0ecb606cb6cf65de1d9fc8a919bceb4be476c602 (patch)
tree2ea1f8305970753e4a657acb2ccc15ca3eec8e2c /math/e_scalb.c
parent7d58530341304d403a6626d7f7a1913165fe2f32 (diff)
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+/* @(#)e_scalb.c 5.1 93/09/24 */
+/*
+ * ====================================================
+ * 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.
+ * ====================================================
+ */
+
+#if defined(LIBM_SCCS) && !defined(lint)
+static char rcsid[] = "$NetBSD: e_scalb.c,v 1.6 1995/05/10 20:46:09 jtc Exp $";
+#endif
+
+/*
+ * __ieee754_scalb(x, fn) is provide for
+ * passing various standard test suite. One
+ * should use scalbn() instead.
+ */
+
+#include <fenv.h>
+#include <math.h>
+#include "math_private.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 __scalbn(x,fn);
+#else
+ if (__isnan(x)||__isnan(fn)) return x*fn;
+ if (!__finite(fn)) {
+ if(fn>0.0) return x*fn;
+ else if (x == 0)
+ return x;
+ else if (!__finite (x))
+ {
+# ifdef FE_INVALID
+ feraiseexcept (FE_INVALID);
+# endif
+ return __nan ("");
+ }
+ else return x/(-fn);
+ }
+ if (__rint(fn)!=fn)
+ {
+# ifdef FE_INVALID
+ feraiseexcept (FE_INVALID);
+# endif
+ return __nan ("");
+ }
+ if ( fn > 65000.0) return __scalbn(x, 65000);
+ if (-fn > 65000.0) return __scalbn(x,-65000);
+ return __scalbn(x,(int)fn);
+#endif
+}