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

• Lines: 89
• Date: Fri Apr 13 20:26:07 2001
• Orig file: v2.4.3/linux/arch/mips/math-emu/dp_tint.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.3/linux/arch/mips/math-emu/dp_tint.c linux/arch/mips/math-emu/dp_tint.c
@@ -0,0 +1,88 @@
+/* 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 <linux/kernel.h>
+#include "ieee754dp.h"
+
+int ieee754dp_tint(ieee754dp x)
+{
+	COMPXDP;
+
+	CLEARCX;
+
+	EXPLODEXDP;
+
+	switch (xc) {
+	case IEEE754_CLASS_SNAN:
+	case IEEE754_CLASS_QNAN:
+		SETCX(IEEE754_INVALID_OPERATION);
+		return ieee754si_xcpt(ieee754si_indef(), "fixdp", x);
+	case IEEE754_CLASS_INF:
+		SETCX(IEEE754_OVERFLOW);
+		return ieee754si_xcpt(ieee754si_indef(), "fixdp", x);
+	case IEEE754_CLASS_ZERO:
+		return 0;
+	case IEEE754_CLASS_DNORM:	/* much to small */
+		SETCX(IEEE754_UNDERFLOW);
+		return ieee754si_xcpt(0, "fixdp", x);
+	case IEEE754_CLASS_NORM:
+		break;
+	}
+	if (xe >= 31) {
+		SETCX(IEEE754_OVERFLOW);
+		return ieee754si_xcpt(ieee754si_indef(), "fix", x);
+	}
+	if (xe < 0) {
+		SETCX(IEEE754_UNDERFLOW);
+		return ieee754si_xcpt(0, "fix", x);
+	}
+	/* oh gawd */
+	if (xe > DP_MBITS) {
+		xm <<= xe - DP_MBITS;
+	} else if (xe < DP_MBITS) {
+		/* XXX no rounding 
+		 */
+		xm >>= DP_MBITS - xe;
+	}
+	if (xs)
+		return -xm;
+	else
+		return xm;
+}
+
+
+unsigned int ieee754dp_tuns(ieee754dp x)
+{
+	ieee754dp hb = ieee754dp_1e31();
+
+	/* what if x < 0 ?? */
+	if (ieee754dp_lt(x, hb))
+		return (unsigned) ieee754dp_tint(x);
+
+	return (unsigned) ieee754dp_tint(ieee754dp_sub(x, hb)) |
+	    ((unsigned) 1 << 31);
+}