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

• Lines: 71
• Date: Fri Apr 13 20:26:07 2001
• Orig file: v2.4.3/linux/arch/mips/math-emu/dp_fsp.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.3/linux/arch/mips/math-emu/dp_fsp.c linux/arch/mips/math-emu/dp_fsp.c
@@ -0,0 +1,70 @@
+/* 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_fsp(ieee754sp x)
+{
+	COMPXSP;
+
+	CLEARCX;
+
+	EXPLODEXSP;
+
+	switch (xc) {
+	case IEEE754_CLASS_QNAN:
+	case IEEE754_CLASS_SNAN:
+		return ieee754dp_nanxcpt(builddp(xs,
+						 DP_EMAX + 1 + DP_EBIAS,
+						 ((unsigned long long) xm
+						  << (DP_MBITS -
+						      SP_MBITS))), "fsp",
+					 x);
+	case IEEE754_CLASS_INF:
+		return ieee754dp_inf(xs);
+	case IEEE754_CLASS_ZERO:
+		return ieee754dp_zero(xs);
+	case IEEE754_CLASS_DNORM:
+		/* normalize */
+		while ((xm >> SP_MBITS) == 0) {
+			xm <<= 1;
+			xe--;
+		}
+		break;
+	case IEEE754_CLASS_NORM:
+		break;
+	}
+
+	/* CANT possibly overflow,underflow, or need rounding
+	 */
+
+	/* drop the hidden bit */
+	xm &= ~SP_HIDDEN_BIT;
+
+	return builddp(xs, xe + DP_EBIAS,
+		       (unsigned long long) xm << (DP_MBITS - SP_MBITS));
+}