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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/mips/math-emu/ieee754sp.h
Initial import
Diffstat (limited to 'arch/mips/math-emu/ieee754sp.h')
-rw-r--r--arch/mips/math-emu/ieee754sp.h86
1 files changed, 86 insertions, 0 deletions
diff --git a/arch/mips/math-emu/ieee754sp.h b/arch/mips/math-emu/ieee754sp.h
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index 000000000..374a3f00a
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+++ b/arch/mips/math-emu/ieee754sp.h
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+/*
+ * IEEE754 floating point
+ * double precision internal header file
+ */
+/*
+ * 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 <linux/compiler.h>
+
+#include "ieee754int.h"
+
+#define assert(expr) ((void)0)
+
+#define SP_EBIAS 127
+#define SP_EMIN (-126)
+#define SP_EMAX 127
+#define SP_FBITS 23
+#define SP_MBITS 23
+
+#define SP_MBIT(x) ((u32)1 << (x))
+#define SP_HIDDEN_BIT SP_MBIT(SP_FBITS)
+#define SP_SIGN_BIT SP_MBIT(31)
+
+#define SPSIGN(sp) (sp.sign)
+#define SPBEXP(sp) (sp.bexp)
+#define SPMANT(sp) (sp.mant)
+
+static inline int ieee754sp_finite(union ieee754sp x)
+{
+ return SPBEXP(x) != SP_EMAX + 1 + SP_EBIAS;
+}
+
+/* 3bit extended single precision sticky right shift */
+#define SPXSRSXn(rs) \
+ (xe += rs, \
+ xm = (rs > (SP_FBITS+3))?1:((xm) >> (rs)) | ((xm) << (32-(rs)) != 0))
+
+#define SPXSRSX1() \
+ (xe++, (xm = (xm >> 1) | (xm & 1)))
+
+#define SPXSRSYn(rs) \
+ (ye+=rs, \
+ ym = (rs > (SP_FBITS+3))?1:((ym) >> (rs)) | ((ym) << (32-(rs)) != 0))
+
+#define SPXSRSY1() \
+ (ye++, (ym = (ym >> 1) | (ym & 1)))
+
+/* convert denormal to normalized with extended exponent */
+#define SPDNORMx(m,e) \
+ while ((m >> SP_FBITS) == 0) { m <<= 1; e--; }
+#define SPDNORMX SPDNORMx(xm, xe)
+#define SPDNORMY SPDNORMx(ym, ye)
+
+static inline union ieee754sp buildsp(int s, int bx, unsigned m)
+{
+ union ieee754sp r;
+
+ assert((s) == 0 || (s) == 1);
+ assert((bx) >= SP_EMIN - 1 + SP_EBIAS
+ && (bx) <= SP_EMAX + 1 + SP_EBIAS);
+ assert(((m) >> SP_FBITS) == 0);
+
+ r.sign = s;
+ r.bexp = bx;
+ r.mant = m;
+
+ return r;
+}
+
+extern union ieee754sp __cold ieee754sp_nanxcpt(union ieee754sp);
+extern union ieee754sp ieee754sp_format(int, int, unsigned);