import newlib-2000-02-17 snapshot

1 files changed, 118 insertions, 0 deletions

diff --git a/newlib/libm/math/wf_scalb.c b/newlib/libm/math/wf_scalb.c
new file mode 100644
index 000000000..bd2d9f8b4
--- /dev/null
+++ b/newlib/libm/math/wf_scalb.c
@@ -0,0 +1,118 @@
+/* wf_scalb.c -- float version of w_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.
+ * ====================================================
+ */
+
+/*
+ * wrapper scalbf(float x, float 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
+	float scalbf(float x, int fn)		/* wrapper scalbf */
+#else
+	float scalbf(float x, float fn)		/* wrapper scalbf */
+#endif
+#else
+	float scalbf(x,fn)			/* wrapper scalbf */
+#ifdef _SCALB_INT
+	float x; int fn;
+#else
+	float x,fn;
+#endif
+#endif
+{
+#ifdef _IEEE_LIBM
+	return __ieee754_scalbf(x,fn);
+#else
+	float 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_scalbf(x,fn);
+	if(_LIB_VERSION == _IEEE_) return z;
+	if(!(finitef(z)||isnanf(z))&&finitef(x)) {
+	    /* scalbf overflow; SVID also returns +-HUGE_VAL */
+	    exc.type = OVERFLOW;
+	    exc.name = "scalbf";
+	    exc.err = 0;
+	    exc.arg1 = (double)x;
+	    exc.arg2 = (double)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==(float)0.0&&z!=x) {
+	    /* scalbf underflow */
+	    exc.type = UNDERFLOW;
+	    exc.name = "scalbf";
+	    exc.err = 0;
+	    exc.arg1 = (double)x;
+	    exc.arg2 = (double)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(!finitef(fn)) errno = ERANGE;
+#endif
+	return z;
+#endif 
+}
+
+#ifdef _DOUBLE_IS_32BITS
+
+#ifdef __STDC__
+#ifdef _SCALB_INT
+	double scalb(double x, int fn)
+#else 
+	double scalb(double x, double fn)
+#endif
+#else
+	double scalb(x, fn)
+#ifdef _SCALB_INT
+	double x; int fn;
+#else
+	double x,fn;
+#endif
+#endif
+{
+#ifdef _SCALB_INT
+	return (double) scalbf((float) x, fn);
+#else
+	return (double) scalbf((float) x, (float) fn);
+#endif
+}
+
+#endif /* defined(_DOUBLE_IS_32BITS) */