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-rw-r--r--arch/mips/math-emu/ieee754.c138
1 files changed, 138 insertions, 0 deletions
diff --git a/arch/mips/math-emu/ieee754.c b/arch/mips/math-emu/ieee754.c
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index 00000000000..f0a364adbf3
--- /dev/null
+++ b/arch/mips/math-emu/ieee754.c
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+/* ieee754 floating point arithmetic
+ * single and double precision
+ *
+ * BUGS
+ * not much dp done
+ * doesn't generate IEEE754_INEXACT
+ *
+ */
+/*
+ * 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 "ieee754int.h"
+
+#define DP_EBIAS 1023
+#define DP_EMIN (-1022)
+#define DP_EMAX 1023
+
+#define SP_EBIAS 127
+#define SP_EMIN (-126)
+#define SP_EMAX 127
+
+/* indexed by class */
+const char *const ieee754_cname[] = {
+ "Normal",
+ "Zero",
+ "Denormal",
+ "Infinity",
+ "QNaN",
+ "SNaN",
+};
+
+/* the control status register
+*/
+struct ieee754_csr ieee754_csr;
+
+/* special constants
+*/
+
+
+#if (defined(BYTE_ORDER) && BYTE_ORDER == LITTLE_ENDIAN) || defined(__MIPSEL__)
+#define SPSTR(s,b,m) {m,b,s}
+#define DPSTR(s,b,mh,ml) {ml,mh,b,s}
+#endif
+
+#ifdef __MIPSEB__
+#define SPSTR(s,b,m) {s,b,m}
+#define DPSTR(s,b,mh,ml) {s,b,mh,ml}
+#endif
+
+const struct ieee754dp_konst __ieee754dp_spcvals[] = {
+ DPSTR(0, DP_EMIN - 1 + DP_EBIAS, 0, 0), /* + zero */
+ DPSTR(1, DP_EMIN - 1 + DP_EBIAS, 0, 0), /* - zero */
+ DPSTR(0, DP_EBIAS, 0, 0), /* + 1.0 */
+ DPSTR(1, DP_EBIAS, 0, 0), /* - 1.0 */
+ DPSTR(0, 3 + DP_EBIAS, 0x40000, 0), /* + 10.0 */
+ DPSTR(1, 3 + DP_EBIAS, 0x40000, 0), /* - 10.0 */
+ DPSTR(0, DP_EMAX + 1 + DP_EBIAS, 0, 0), /* + infinity */
+ DPSTR(1, DP_EMAX + 1 + DP_EBIAS, 0, 0), /* - infinity */
+ DPSTR(0,DP_EMAX+1+DP_EBIAS,0x7FFFF,0xFFFFFFFF), /* + indef quiet Nan */
+ DPSTR(0, DP_EMAX + DP_EBIAS, 0xFFFFF, 0xFFFFFFFF), /* + max */
+ DPSTR(1, DP_EMAX + DP_EBIAS, 0xFFFFF, 0xFFFFFFFF), /* - max */
+ DPSTR(0, DP_EMIN + DP_EBIAS, 0, 0), /* + min normal */
+ DPSTR(1, DP_EMIN + DP_EBIAS, 0, 0), /* - min normal */
+ DPSTR(0, DP_EMIN - 1 + DP_EBIAS, 0, 1), /* + min denormal */
+ DPSTR(1, DP_EMIN - 1 + DP_EBIAS, 0, 1), /* - min denormal */
+ DPSTR(0, 31 + DP_EBIAS, 0, 0), /* + 1.0e31 */
+ DPSTR(0, 63 + DP_EBIAS, 0, 0), /* + 1.0e63 */
+};
+
+const struct ieee754sp_konst __ieee754sp_spcvals[] = {
+ SPSTR(0, SP_EMIN - 1 + SP_EBIAS, 0), /* + zero */
+ SPSTR(1, SP_EMIN - 1 + SP_EBIAS, 0), /* - zero */
+ SPSTR(0, SP_EBIAS, 0), /* + 1.0 */
+ SPSTR(1, SP_EBIAS, 0), /* - 1.0 */
+ SPSTR(0, 3 + SP_EBIAS, 0x200000), /* + 10.0 */
+ SPSTR(1, 3 + SP_EBIAS, 0x200000), /* - 10.0 */
+ SPSTR(0, SP_EMAX + 1 + SP_EBIAS, 0), /* + infinity */
+ SPSTR(1, SP_EMAX + 1 + SP_EBIAS, 0), /* - infinity */
+ SPSTR(0,SP_EMAX+1+SP_EBIAS,0x3FFFFF), /* + indef quiet Nan */
+ SPSTR(0, SP_EMAX + SP_EBIAS, 0x7FFFFF), /* + max normal */
+ SPSTR(1, SP_EMAX + SP_EBIAS, 0x7FFFFF), /* - max normal */
+ SPSTR(0, SP_EMIN + SP_EBIAS, 0), /* + min normal */
+ SPSTR(1, SP_EMIN + SP_EBIAS, 0), /* - min normal */
+ SPSTR(0, SP_EMIN - 1 + SP_EBIAS, 1), /* + min denormal */
+ SPSTR(1, SP_EMIN - 1 + SP_EBIAS, 1), /* - min denormal */
+ SPSTR(0, 31 + SP_EBIAS, 0), /* + 1.0e31 */
+ SPSTR(0, 63 + SP_EBIAS, 0), /* + 1.0e63 */
+};
+
+
+int ieee754si_xcpt(int r, const char *op, ...)
+{
+ struct ieee754xctx ax;
+
+ if (!TSTX())
+ return r;
+ ax.op = op;
+ ax.rt = IEEE754_RT_SI;
+ ax.rv.si = r;
+ va_start(ax.ap, op);
+ ieee754_xcpt(&ax);
+ return ax.rv.si;
+}
+
+s64 ieee754di_xcpt(s64 r, const char *op, ...)
+{
+ struct ieee754xctx ax;
+
+ if (!TSTX())
+ return r;
+ ax.op = op;
+ ax.rt = IEEE754_RT_DI;
+ ax.rv.di = r;
+ va_start(ax.ap, op);
+ ieee754_xcpt(&ax);
+ return ax.rv.di;
+}