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-rw-r--r--arch/mips/math-emu/sp_div.c157
1 files changed, 157 insertions, 0 deletions
diff --git a/arch/mips/math-emu/sp_div.c b/arch/mips/math-emu/sp_div.c
new file mode 100644
index 00000000000..2b437fcfdad
--- /dev/null
+++ b/arch/mips/math-emu/sp_div.c
@@ -0,0 +1,157 @@
+/* IEEE754 floating point arithmetic
+ * single precision
+ */
+/*
+ * 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 "ieee754sp.h"
+
+ieee754sp ieee754sp_div(ieee754sp x, ieee754sp y)
+{
+ COMPXSP;
+ COMPYSP;
+
+ EXPLODEXSP;
+ EXPLODEYSP;
+
+ CLEARCX;
+
+ FLUSHXSP;
+ FLUSHYSP;
+
+ switch (CLPAIR(xc, yc)) {
+ case CLPAIR(IEEE754_CLASS_SNAN, IEEE754_CLASS_QNAN):
+ case CLPAIR(IEEE754_CLASS_QNAN, IEEE754_CLASS_SNAN):
+ case CLPAIR(IEEE754_CLASS_SNAN, IEEE754_CLASS_SNAN):
+ case CLPAIR(IEEE754_CLASS_ZERO, IEEE754_CLASS_SNAN):
+ case CLPAIR(IEEE754_CLASS_NORM, IEEE754_CLASS_SNAN):
+ case CLPAIR(IEEE754_CLASS_DNORM, IEEE754_CLASS_SNAN):
+ case CLPAIR(IEEE754_CLASS_INF, IEEE754_CLASS_SNAN):
+ case CLPAIR(IEEE754_CLASS_SNAN, IEEE754_CLASS_ZERO):
+ case CLPAIR(IEEE754_CLASS_SNAN, IEEE754_CLASS_NORM):
+ case CLPAIR(IEEE754_CLASS_SNAN, IEEE754_CLASS_DNORM):
+ case CLPAIR(IEEE754_CLASS_SNAN, IEEE754_CLASS_INF):
+ SETCX(IEEE754_INVALID_OPERATION);
+ return ieee754sp_nanxcpt(ieee754sp_indef(), "div", x, y);
+
+ case CLPAIR(IEEE754_CLASS_ZERO, IEEE754_CLASS_QNAN):
+ case CLPAIR(IEEE754_CLASS_NORM, IEEE754_CLASS_QNAN):
+ case CLPAIR(IEEE754_CLASS_DNORM, IEEE754_CLASS_QNAN):
+ case CLPAIR(IEEE754_CLASS_INF, IEEE754_CLASS_QNAN):
+ return y;
+
+ case CLPAIR(IEEE754_CLASS_QNAN, IEEE754_CLASS_QNAN):
+ case CLPAIR(IEEE754_CLASS_QNAN, IEEE754_CLASS_ZERO):
+ case CLPAIR(IEEE754_CLASS_QNAN, IEEE754_CLASS_NORM):
+ case CLPAIR(IEEE754_CLASS_QNAN, IEEE754_CLASS_DNORM):
+ case CLPAIR(IEEE754_CLASS_QNAN, IEEE754_CLASS_INF):
+ return x;
+
+
+ /* Infinity handling
+ */
+
+ case CLPAIR(IEEE754_CLASS_INF, IEEE754_CLASS_INF):
+ SETCX(IEEE754_INVALID_OPERATION);
+ return ieee754sp_xcpt(ieee754sp_indef(), "div", x, y);
+
+ case CLPAIR(IEEE754_CLASS_NORM, IEEE754_CLASS_INF):
+ case CLPAIR(IEEE754_CLASS_ZERO, IEEE754_CLASS_INF):
+ case CLPAIR(IEEE754_CLASS_DNORM, IEEE754_CLASS_INF):
+ return ieee754sp_zero(xs ^ ys);
+
+ case CLPAIR(IEEE754_CLASS_INF, IEEE754_CLASS_ZERO):
+ case CLPAIR(IEEE754_CLASS_INF, IEEE754_CLASS_NORM):
+ case CLPAIR(IEEE754_CLASS_INF, IEEE754_CLASS_DNORM):
+ return ieee754sp_inf(xs ^ ys);
+
+ /* Zero handling
+ */
+
+ case CLPAIR(IEEE754_CLASS_ZERO, IEEE754_CLASS_ZERO):
+ SETCX(IEEE754_INVALID_OPERATION);
+ return ieee754sp_xcpt(ieee754sp_indef(), "div", x, y);
+
+ case CLPAIR(IEEE754_CLASS_NORM, IEEE754_CLASS_ZERO):
+ case CLPAIR(IEEE754_CLASS_DNORM, IEEE754_CLASS_ZERO):
+ SETCX(IEEE754_ZERO_DIVIDE);
+ return ieee754sp_xcpt(ieee754sp_inf(xs ^ ys), "div", x, y);
+
+ case CLPAIR(IEEE754_CLASS_ZERO, IEEE754_CLASS_NORM):
+ case CLPAIR(IEEE754_CLASS_ZERO, IEEE754_CLASS_DNORM):
+ return ieee754sp_zero(xs == ys ? 0 : 1);
+
+ case CLPAIR(IEEE754_CLASS_DNORM, IEEE754_CLASS_DNORM):
+ SPDNORMX;
+
+ case CLPAIR(IEEE754_CLASS_NORM, IEEE754_CLASS_DNORM):
+ SPDNORMY;
+ break;
+
+ case CLPAIR(IEEE754_CLASS_DNORM, IEEE754_CLASS_NORM):
+ SPDNORMX;
+ break;
+
+ case CLPAIR(IEEE754_CLASS_NORM, IEEE754_CLASS_NORM):
+ break;
+ }
+ assert(xm & SP_HIDDEN_BIT);
+ assert(ym & SP_HIDDEN_BIT);
+
+ /* provide rounding space */
+ xm <<= 3;
+ ym <<= 3;
+
+ {
+ /* now the dirty work */
+
+ unsigned rm = 0;
+ int re = xe - ye;
+ unsigned bm;
+
+ for (bm = SP_MBIT(SP_MBITS + 2); bm; bm >>= 1) {
+ if (xm >= ym) {
+ xm -= ym;
+ rm |= bm;
+ if (xm == 0)
+ break;
+ }
+ xm <<= 1;
+ }
+ rm <<= 1;
+ if (xm)
+ rm |= 1; /* have remainder, set sticky */
+
+ assert(rm);
+
+ /* normalise rm to rounding precision ?
+ */
+ while ((rm >> (SP_MBITS + 3)) == 0) {
+ rm <<= 1;
+ re--;
+ }
+
+ SPNORMRET2(xs == ys ? 0 : 1, re, rm, "div", x, y);
+ }
+}