import newlib-2000-02-17 snapshot

1 files changed, 94 insertions, 0 deletions

diff --git a/newlib/libm/math/w_scalb.c b/newlib/libm/math/w_scalb.c
new file mode 100644
index 000000000..c32496892
--- /dev/null
+++ b/newlib/libm/math/w_scalb.c
@@ -0,0 +1,94 @@
+
+/* @(#)w_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.
+ * ====================================================
+ */
+
+/*
+ * 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>
+
+#ifndef _DOUBLE_IS_32BITS
+
+#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;
+#ifndef HUGE_VAL 
+#define HUGE_VAL inf
+	double inf = 0.0;
+
+	SET_HIGH_WORD(inf,0x7ff00000);	/* set inf to infinite */
+#endif
+	struct exception exc;
+	z = __ieee754_scalb(x,fn);
+	if(_LIB_VERSION == _IEEE_) return z;
+	if(!(finite(z)||isnan(z))&&finite(x)) {
+	    /* scalb overflow; SVID also returns +-HUGE_VAL */
+	    exc.type = OVERFLOW;
+	    exc.name = "scalb";
+	    exc.err = 0;
+	    exc.arg1 = x;
+	    exc.arg2 = fn;
+	    exc.retval = x > 0.0 ? HUGE_VAL : -HUGE_VAL;
+	    if (_LIB_VERSION == _POSIX_)
+	       errno = ERANGE;
+	    else if (!matherr(&exc)) {
+	       errno = ERANGE;
+	    }
+	    if (exc.err != 0)
+	       errno = exc.err;
+            return exc.retval;
+	}
+	if(z==0.0&&z!=x) {
+	    /* scalb underflow */
+	    exc.type = UNDERFLOW;
+	    exc.name = "scalb";
+	    exc.err = 0;
+	    exc.arg1 = x;
+	    exc.arg2 = fn;
+	    exc.retval = copysign(0.0,x);
+	    if (_LIB_VERSION == _POSIX_)
+	       errno = ERANGE;
+	    else if (!matherr(&exc)) {
+	       errno = ERANGE;
+	    }
+	    if (exc.err != 0)
+	       errno = exc.err;
+            return exc.retval; 
+	} 
+#ifndef _SCALB_INT
+	if(!finite(fn)) errno = ERANGE;
+#endif
+	return z;
+#endif 
+}
+
+#endif /* defined(_DOUBLE_IS_32BITS) */