1 files changed, 80 insertions, 0 deletions

diff --git a/arch/mips/math-emu/dp_modf.c b/arch/mips/math-emu/dp_modf.c
new file mode 100644
index 000000000000..25861a42c36f
--- /dev/null
+++ b/arch/mips/math-emu/dp_modf.c
@@ -0,0 +1,80 @@
+/* IEEE754 floating point arithmetic
+ * double precision: common utilities
+ */
+/*
+ * MIPS floating point support
+ * Copyright (C) 1994-2000 Algorithmics Ltd.
+ * 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"
+
+/* modf function is always exact for a finite number
+*/
+ieee754dp ieee754dp_modf(ieee754dp x, ieee754dp * ip)
+{
+        COMPXDP;
+
+        CLEARCX;
+
+        EXPLODEXDP;
+
+        switch (xc) {
+        case IEEE754_CLASS_SNAN:
+        case IEEE754_CLASS_QNAN:
+        case IEEE754_CLASS_INF:
+        case IEEE754_CLASS_ZERO:
+                *ip = x;
+                return x;
+        case IEEE754_CLASS_DNORM:
+                /* far to small */
+                *ip = ieee754dp_zero(xs);
+                return x;
+        case IEEE754_CLASS_NORM:
+                break;
+        }
+        if (xe < 0) {
+                *ip = ieee754dp_zero(xs);
+                return x;
+        }
+        if (xe >= DP_MBITS) {
+                *ip = x;
+                return ieee754dp_zero(xs);
+        }
+        /* generate ipart mantissa by clearing bottom bits
+         */
+        *ip = builddp(xs, xe + DP_EBIAS,
+                      ((xm >> (DP_MBITS - xe)) << (DP_MBITS - xe)) &
+                      ~DP_HIDDEN_BIT);
+
+        /* generate fpart mantissa by clearing top bits
+         * and normalizing (must be able to normalize)
+         */
+        xm = (xm << (64 - (DP_MBITS - xe))) >> (64 - (DP_MBITS - xe));
+        if (xm == 0)
+                return ieee754dp_zero(xs);
+
+        while ((xm >> DP_MBITS) == 0) {
+                xm <<= 1;
+                xe--;
+        }
+        return builddp(xs, xe + DP_EBIAS, xm & ~DP_HIDDEN_BIT);
+}