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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-17 02:20:36 +0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-17 02:20:36 +0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/mips/math-emu/dp_fsp.c
downloadlinux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/mips/math-emu/dp_fsp.c')
-rw-r--r--arch/mips/math-emu/dp_fsp.c74
1 files changed, 74 insertions, 0 deletions
diff --git a/arch/mips/math-emu/dp_fsp.c b/arch/mips/math-emu/dp_fsp.c
new file mode 100644
index 000000000000..494d19ac7049
--- /dev/null
+++ b/arch/mips/math-emu/dp_fsp.c
@@ -0,0 +1,74 @@
+/* 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"
+
+ieee754dp ieee754dp_fsp(ieee754sp x)
+{
+ COMPXSP;
+
+ EXPLODEXSP;
+
+ CLEARCX;
+
+ FLUSHXSP;
+
+ switch (xc) {
+ case IEEE754_CLASS_SNAN:
+ SETCX(IEEE754_INVALID_OPERATION);
+ return ieee754dp_nanxcpt(ieee754dp_indef(), "fsp");
+ case IEEE754_CLASS_QNAN:
+ return ieee754dp_nanxcpt(builddp(xs,
+ DP_EMAX + 1 + DP_EBIAS,
+ ((u64) xm
+ << (DP_MBITS -
+ SP_MBITS))), "fsp",
+ x);
+ case IEEE754_CLASS_INF:
+ return ieee754dp_inf(xs);
+ case IEEE754_CLASS_ZERO:
+ return ieee754dp_zero(xs);
+ case IEEE754_CLASS_DNORM:
+ /* normalize */
+ while ((xm >> SP_MBITS) == 0) {
+ xm <<= 1;
+ xe--;
+ }
+ break;
+ case IEEE754_CLASS_NORM:
+ break;
+ }
+
+ /* CANT possibly overflow,underflow, or need rounding
+ */
+
+ /* drop the hidden bit */
+ xm &= ~SP_HIDDEN_BIT;
+
+ return builddp(xs, xe + DP_EBIAS,
+ (u64) xm << (DP_MBITS - SP_MBITS));
+}