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Diffstat (limited to 'arch/mips/math-emu/dp_fint.c')
-rw-r--r--arch/mips/math-emu/dp_fint.c56
1 files changed, 56 insertions, 0 deletions
diff --git a/arch/mips/math-emu/dp_fint.c b/arch/mips/math-emu/dp_fint.c
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index 000000000..10258f0af
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+++ b/arch/mips/math-emu/dp_fint.c
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+/* 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 "ieee754dp.h"
+
+union ieee754dp ieee754dp_fint(int x)
+{
+ u64 xm;
+ int xe;
+ int xs;
+
+ ieee754_clearcx();
+
+ if (x == 0)
+ return ieee754dp_zero(0);
+ if (x == 1 || x == -1)
+ return ieee754dp_one(x < 0);
+ if (x == 10 || x == -10)
+ return ieee754dp_ten(x < 0);
+
+ xs = (x < 0);
+ if (xs) {
+ if (x == (1 << 31))
+ xm = ((unsigned) 1 << 31); /* max neg can't be safely negated */
+ else
+ xm = -x;
+ } else {
+ xm = x;
+ }
+
+ /* normalize - result can never be inexact or overflow */
+ xe = DP_FBITS;
+ while ((xm >> DP_FBITS) == 0) {
+ xm <<= 1;
+ xe--;
+ }
+ return builddp(xs, xe + DP_EBIAS, xm & ~DP_HIDDEN_BIT);
+}