patch-2.4.20 linux-2.4.20/arch/mips64/math-emu/sp_sub.c

• Lines: 188
• Date: Wed Dec 31 16:00:00 1969
• Orig file: linux-2.4.19/arch/mips64/math-emu/sp_sub.c
• Orig date: Mon Jul 2 13:56:41 2001

diff -urN linux-2.4.19/arch/mips64/math-emu/sp_sub.c linux-2.4.20/arch/mips64/math-emu/sp_sub.c
@@ -1,187 +0,0 @@
-/* IEEE754 floating point arithmetic
- * single precision
- */
-/*
- * 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 "ieee754sp.h"
-
-ieee754sp ieee754sp_sub(ieee754sp x, ieee754sp y)
-{
-	COMPXSP;
-	COMPYSP;
-
-	CLEARCX;
-
-	EXPLODEXSP;
-	EXPLODEYSP;
-
-	switch (CLPAIR(xc, yc)) {
-	case CLPAIR(IEEE754_CLASS_SNAN, IEEE754_CLASS_SNAN):
-		return ieee754sp_nanxcpt(ieee754sp_bestnan(x, y), "sub", 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 ieee754sp_nanxcpt(y, "sub", 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 ieee754sp_nanxcpt(x, "sub", x, y);
-
-	case CLPAIR(IEEE754_CLASS_QNAN, IEEE754_CLASS_QNAN):
-		return ieee754sp_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;
-
-
-		/* Inifity handeling 
-		 */
-
-	case CLPAIR(IEEE754_CLASS_INF, IEEE754_CLASS_INF):
-		if (xs != ys)
-			return x;
-		SETCX(IEEE754_INVALID_OPERATION);
-		return ieee754sp_xcpt(ieee754sp_indef(), "sub", x, y);
-
-	case CLPAIR(IEEE754_CLASS_ZERO, IEEE754_CLASS_INF):
-	case CLPAIR(IEEE754_CLASS_DNORM, IEEE754_CLASS_INF):
-	case CLPAIR(IEEE754_CLASS_NORM, IEEE754_CLASS_INF):
-		return ieee754sp_inf(ys ^ 1);
-
-	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 x;
-
-		/* Zero handeling 
-		 */
-
-	case CLPAIR(IEEE754_CLASS_ZERO, IEEE754_CLASS_ZERO):
-		if (xs != ys)
-			return x;
-		else
-			return ieee754sp_zero(ieee754_csr.rm ==
-					      IEEE754_RD);
-
-	case CLPAIR(IEEE754_CLASS_NORM, IEEE754_CLASS_ZERO):
-	case CLPAIR(IEEE754_CLASS_DNORM, IEEE754_CLASS_ZERO):
-		return x;
-
-	case CLPAIR(IEEE754_CLASS_ZERO, IEEE754_CLASS_NORM):
-	case CLPAIR(IEEE754_CLASS_ZERO, IEEE754_CLASS_DNORM):
-		/* quick fix up */
-		DPSIGN(y) ^= 1;
-		return y;
-
-	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;
-	}
-	/* flip sign of y and handle as add */
-	ys ^= 1;
-
-	assert(xm & SP_HIDDEN_BIT);
-	assert(ym & SP_HIDDEN_BIT);
-
-
-	/* provide guard,round and stick bit space */
-	xm <<= 3;
-	ym <<= 3;
-
-	if (xe > ye) {
-		/* have to shift y fraction right to align
-		 */
-		int s = xe - ye;
-		SPXSRSYn(s);
-	} else if (ye > xe) {
-		/* have to shift x fraction right to align
-		 */
-		int s = ye - xe;
-		SPXSRSXn(s);
-	}
-	assert(xe == ye);
-	assert(xe <= SP_EMAX);
-
-	if (xs == ys) {
-		/* generate 28 bit result of adding two 27 bit numbers
-		 */
-		xm = xm + ym;
-		xe = xe;
-		xs = xs;
-
-		if (xm >> (SP_MBITS + 1 + 3)) {	/* carry out */
-			SPXSRSX1();	/* shift preserving sticky */
-		}
-	} else {
-		if (xm >= ym) {
-			xm = xm - ym;
-			xe = xe;
-			xs = xs;
-		} else {
-			xm = ym - xm;
-			xe = xe;
-			xs = ys;
-		}
-		if (xm == 0)
-			if (ieee754_csr.rm == IEEE754_RD)
-				return ieee754sp_zero(1);	/* round negative inf. => sign = -1 */
-			else
-				return ieee754sp_zero(0);	/* other round modes   => sign = 1 */
-
-		/* normalize to rounding precision 
-		 */
-		while ((xm >> (SP_MBITS + 3)) == 0) {
-			xm <<= 1;
-			xe--;
-		}
-	}
-	SPNORMRET2(xs, xe, xm, "sub", x, y);
-}