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

• Lines: 70
• Date: Fri Apr 13 20:26:07 2001
• Orig file: v2.4.3/linux/arch/mips/math-emu/sp_fdp.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.3/linux/arch/mips/math-emu/sp_fdp.c linux/arch/mips/math-emu/sp_fdp.c
@@ -0,0 +1,69 @@
+/* IEEE754 floating point arithmetic
+ * single precision
+ */
+/*
+ * 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 "ieee754sp.h"
+
+ieee754sp ieee754sp_fdp(ieee754dp x)
+{
+	COMPXDP;
+
+	CLEARCX;
+
+	EXPLODEXDP;
+
+	switch (xc) {
+	case IEEE754_CLASS_QNAN:
+	case IEEE754_CLASS_SNAN:
+		return ieee754sp_nanxcpt(buildsp(xs,
+						 SP_EMAX + 1 + SP_EBIAS,
+						 (unsigned long)
+						 (xm >>
+						  (DP_MBITS - SP_MBITS))),
+					 "fdp", x);
+	case IEEE754_CLASS_INF:
+		return ieee754sp_inf(xs);
+	case IEEE754_CLASS_ZERO:
+		return ieee754sp_zero(xs);
+	case IEEE754_CLASS_DNORM:
+		/* cant possibly be sp representable */
+		SETCX(IEEE754_UNDERFLOW);
+		return ieee754sp_xcpt(ieee754sp_zero(xs), "fdp", x);
+	case IEEE754_CLASS_NORM:
+		break;
+	}
+
+	{
+		unsigned long rm;
+
+		/* convert from DP_MBITS to SP_MBITS+3 with sticky right shift 
+		 */
+		rm = (xm >> (DP_MBITS - (SP_MBITS + 3))) |
+		    ((xm << (64 - (DP_MBITS - (SP_MBITS + 3)))) != 0);
+
+		SPNORMRET1(xs, xe, rm, "fdp", x);
+	}
+}