patch-2.4.20 linux-2.4.20/arch/mips64/math-emu/dp_div.c
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- Lines: 161
- Date:
Wed Dec 31 16:00:00 1969
- Orig file:
linux-2.4.19/arch/mips64/math-emu/dp_div.c
- Orig date:
Mon Jul 2 13:56:40 2001
diff -urN linux-2.4.19/arch/mips64/math-emu/dp_div.c linux-2.4.20/arch/mips64/math-emu/dp_div.c
@@ -1,160 +0,0 @@
-/* IEEE754 floating point arithmetic
- * double precision: common utilities
- */
-/*
- * MIPS floating point support
- * Copyright (C) 1994-2000 Algorithmics Ltd. All rights reserved.
- * 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_div(ieee754dp x, ieee754dp y)
-{
- COMPXDP;
- COMPYDP;
-
- CLEARCX;
-
- EXPLODEXDP;
- EXPLODEYDP;
-
- switch (CLPAIR(xc, yc)) {
- case CLPAIR(IEEE754_CLASS_SNAN, IEEE754_CLASS_SNAN):
- return ieee754dp_nanxcpt(ieee754dp_bestnan(x, y), "div", x,
- y);
-
- case CLPAIR(IEEE754_CLASS_QNAN, 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):
- return ieee754dp_nanxcpt(y, "div", x, y);
-
- case CLPAIR(IEEE754_CLASS_SNAN, IEEE754_CLASS_QNAN):
- 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):
- return ieee754dp_nanxcpt(x, "div", x, y);
-
- case CLPAIR(IEEE754_CLASS_QNAN, IEEE754_CLASS_QNAN):
- return ieee754dp_bestnan(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_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 handeling
- */
-
- case CLPAIR(IEEE754_CLASS_INF, IEEE754_CLASS_INF):
- SETCX(IEEE754_INVALID_OPERATION);
- return ieee754dp_xcpt(ieee754dp_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 ieee754dp_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 ieee754dp_inf(xs ^ ys);
-
- /* Zero handeling
- */
-
- case CLPAIR(IEEE754_CLASS_ZERO, IEEE754_CLASS_ZERO):
- SETCX(IEEE754_INVALID_OPERATION);
- return ieee754dp_xcpt(ieee754dp_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 ieee754dp_xcpt(ieee754dp_inf(xs ^ ys), "div", x, y);
-
- case CLPAIR(IEEE754_CLASS_ZERO, IEEE754_CLASS_NORM):
- case CLPAIR(IEEE754_CLASS_ZERO, IEEE754_CLASS_DNORM):
- return ieee754dp_zero(xs == ys ? 0 : 1);
-
- case CLPAIR(IEEE754_CLASS_DNORM, IEEE754_CLASS_DNORM):
- DPDNORMX;
-
- case CLPAIR(IEEE754_CLASS_NORM, IEEE754_CLASS_DNORM):
- DPDNORMY;
- break;
-
- case CLPAIR(IEEE754_CLASS_DNORM, IEEE754_CLASS_NORM):
- DPDNORMX;
- break;
-
- case CLPAIR(IEEE754_CLASS_NORM, IEEE754_CLASS_NORM):
- break;
- }
- assert(xm & DP_HIDDEN_BIT);
- assert(ym & DP_HIDDEN_BIT);
-
- /* provide rounding space */
- xm <<= 3;
- ym <<= 3;
-
- {
- /* now the dirty work */
-
- unsigned long long rm = 0;
- int re = xe - ye;
- unsigned long long bm;
-
- for (bm = DP_MBIT(DP_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 >> (DP_MBITS + 3)) == 0) {
- rm <<= 1;
- re--;
- }
-
- DPNORMRET2(xs == ys ? 0 : 1, re, rm, "div", x, y);
- }
-}
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TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)