patch-2.4.4 linux/arch/mips/math-emu/dp_fint.c

• Lines: 79
• Date: Fri Apr 13 20:26:07 2001
• Orig file: v2.4.3/linux/arch/mips/math-emu/dp_fint.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.3/linux/arch/mips/math-emu/dp_fint.c linux/arch/mips/math-emu/dp_fint.c
@@ -0,0 +1,78 @@
+/* IEEE754 floating point arithmetic
+ * double precision: common utilities
+ */
+/*
+ * MIPS floating point support
+ * Copyright (C) 1994-2000 Algorithmics Ltd.  All rights reserved.
+ * http://www.algor.co.uk
+ *
+ * ########################################################################
+ *
+ *  This program is free software; you can distribute it and/or modify it
+ *  under the terms of the GNU General Public License (Version 2) as
+ *  published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope 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
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ * ########################################################################
+ */
+
+
+#include "ieee754dp.h"
+
+ieee754dp ieee754dp_fint(int x)
+{
+	COMPXDP;
+
+	CLEARCX;
+
+	if (x == 0)
+		return ieee754dp_zero(0);
+	if (x == 1 || x == -1)
+		return ieee754dp_one(x < 0);
+	if (x == 10 || x == -10)
+		return ieee754dp_ten(x < 0);
+
+	xs = (x < 0);
+	if (xs) {
+		if (x == (1 << 31))
+			xm = ((unsigned) 1 << 31);	/* max neg can't be safely negated */
+		else
+			xm = -x;
+	} else {
+		xm = x;
+	}
+
+#if 1
+	/* normalize - result can never be inexact or overflow */
+	xe = DP_MBITS;
+	while ((xm >> DP_MBITS) == 0) {
+		xm <<= 1;
+		xe--;
+	}
+	return builddp(xs, xe + DP_EBIAS, xm & ~DP_HIDDEN_BIT);
+#else
+	/* normalize */
+	xe = DP_MBITS + 3;
+	while ((xm >> (DP_MBITS + 3)) == 0) {
+		xm <<= 1;
+		xe--;
+	}
+	DPNORMRET1(xs, xe, xm, "fint", x);
+#endif
+}
+
+ieee754dp ieee754dp_funs(unsigned int u)
+{
+	if ((int) u < 0)
+		return ieee754dp_add(ieee754dp_1e31(),
+				     ieee754dp_fint(u & ~(1 << 31)));
+	return ieee754dp_fint(u);
+}