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authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/arch/mips/math-emu/dp_fsp.c
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/arch/mips/math-emu/dp_fsp.c')
-rw-r--r--kernel/arch/mips/math-emu/dp_fsp.c75
1 files changed, 75 insertions, 0 deletions
diff --git a/kernel/arch/mips/math-emu/dp_fsp.c b/kernel/arch/mips/math-emu/dp_fsp.c
new file mode 100644
index 000000000..57d09ca54
--- /dev/null
+++ b/kernel/arch/mips/math-emu/dp_fsp.c
@@ -0,0 +1,75 @@
+/* IEEE754 floating point arithmetic
+ * double precision: common utilities
+ */
+/*
+ * 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.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "ieee754sp.h"
+#include "ieee754dp.h"
+
+static inline union ieee754dp ieee754dp_nan_fsp(int xs, u64 xm)
+{
+ return builddp(xs, DP_EMAX + 1 + DP_EBIAS,
+ xm << (DP_FBITS - SP_FBITS));
+}
+
+union ieee754dp ieee754dp_fsp(union ieee754sp x)
+{
+ COMPXSP;
+
+ EXPLODEXSP;
+
+ ieee754_clearcx();
+
+ FLUSHXSP;
+
+ switch (xc) {
+ case IEEE754_CLASS_SNAN:
+ return ieee754dp_nanxcpt(ieee754dp_nan_fsp(xs, xm));
+
+ case IEEE754_CLASS_QNAN:
+ return ieee754dp_nan_fsp(xs, xm);
+
+ case IEEE754_CLASS_INF:
+ return ieee754dp_inf(xs);
+
+ case IEEE754_CLASS_ZERO:
+ return ieee754dp_zero(xs);
+
+ case IEEE754_CLASS_DNORM:
+ /* normalize */
+ while ((xm >> SP_FBITS) == 0) {
+ xm <<= 1;
+ xe--;
+ }
+ break;
+
+ case IEEE754_CLASS_NORM:
+ break;
+ }
+
+ /*
+ * Can't possibly overflow,underflow, or need rounding
+ */
+
+ /* drop the hidden bit */
+ xm &= ~SP_HIDDEN_BIT;
+
+ return builddp(xs, xe + DP_EBIAS,
+ (u64) xm << (DP_FBITS - SP_FBITS));
+}