Initial commit

arch/mips/math-emu/sp_fdp.c

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+/* IEEE754 floating point arithmetic
+ * single precision
+ */
+/*
+ * MIPS floating point support
+ * Copyright (C) 1994-2000 Algorithmics Ltd.
+ *
+ * ########################################################################
+ *
+ *  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;
+	ieee754sp nan;
+
+	EXPLODEXDP;
+
+	CLEARCX;
+
+	FLUSHXDP;
+
+	switch (xc) {
+	case IEEE754_CLASS_SNAN:
+		SETCX(IEEE754_INVALID_OPERATION);
+		return ieee754sp_nanxcpt(ieee754sp_indef(), "fdp");
+	case IEEE754_CLASS_QNAN:
+		nan = buildsp(xs, SP_EMAX + 1 + SP_EBIAS, (u32)
+				(xm >> (DP_MBITS - SP_MBITS)));
+		if (!ieee754sp_isnan(nan))
+			nan = ieee754sp_indef();
+		return ieee754sp_nanxcpt(nan, "fdp", x);
+	case IEEE754_CLASS_INF:
+		return ieee754sp_inf(xs);
+	case IEEE754_CLASS_ZERO:
+		return ieee754sp_zero(xs);
+	case IEEE754_CLASS_DNORM:
+		/* can't possibly be sp representable */
+		SETCX(IEEE754_UNDERFLOW);
+		SETCX(IEEE754_INEXACT);
+		if ((ieee754_csr.rm == IEEE754_RU && !xs) ||
+				(ieee754_csr.rm == IEEE754_RD && xs))
+			return ieee754sp_xcpt(ieee754sp_mind(xs), "fdp", x);
+		return ieee754sp_xcpt(ieee754sp_zero(xs), "fdp", x);
+	case IEEE754_CLASS_NORM:
+		break;
+	}
+
+	{
+		u32 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);
+	}
+}