patch-2.4.20 linux-2.4.20/arch/mips64/math-emu/ieee754sp.c

• Lines: 198
• Date: Wed Dec 31 16:00:00 1969
• Orig file: linux-2.4.19/arch/mips64/math-emu/ieee754sp.c
• Orig date: Mon Jul 2 13:56:41 2001

diff -urN linux-2.4.19/arch/mips64/math-emu/ieee754sp.c linux-2.4.20/arch/mips64/math-emu/ieee754sp.c
@@ -1,197 +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"
-
-int ieee754sp_class(ieee754sp x)
-{
-	COMPXSP;
-	EXPLODEXSP;
-	return xc;
-}
-
-int ieee754sp_isnan(ieee754sp x)
-{
-	return ieee754sp_class(x) >= IEEE754_CLASS_SNAN;
-}
-
-int ieee754sp_issnan(ieee754sp x)
-{
-	assert(ieee754sp_isnan(x));
-	if (ieee754_csr.noq)
-		return 1;
-	return !(SPMANT(x) & SP_MBIT(SP_MBITS - 1));
-}
-
-
-ieee754sp ieee754sp_xcpt(ieee754sp r, const char *op, ...)
-{
-	struct ieee754xctx ax;
-
-	if (!TSTX())
-		return r;
-
-	ax.op = op;
-	ax.rt = IEEE754_RT_SP;
-	ax.rv.sp = r;
-	va_start(ax.ap, op);
-	ieee754_xcpt(&ax);
-	return ax.rv.sp;
-}
-
-ieee754sp ieee754sp_nanxcpt(ieee754sp r, const char *op, ...)
-{
-	struct ieee754xctx ax;
-
-	assert(ieee754sp_isnan(r));
-
-	if (!ieee754sp_issnan(r))	/* QNAN does not cause invalid op !! */
-		return r;
-
-	if (!SETCX(IEEE754_INVALID_OPERATION)) {
-		/* not enabled convert to a quiet NaN */
-		if (ieee754_csr.noq)
-			return r;
-		SPMANT(r) |= SP_MBIT(SP_MBITS - 1);
-		return r;
-	}
-
-	ax.op = op;
-	ax.rt = 0;
-	ax.rv.sp = r;
-	va_start(ax.ap, op);
-	ieee754_xcpt(&ax);
-	return ax.rv.sp;
-}
-
-ieee754sp ieee754sp_bestnan(ieee754sp x, ieee754sp y)
-{
-	assert(ieee754sp_isnan(x));
-	assert(ieee754sp_isnan(y));
-
-	if (SPMANT(x) > SPMANT(y))
-		return x;
-	else
-		return y;
-}
-
-
-/* generate a normal/denormal number with over,under handeling
- * sn is sign
- * xe is an unbiased exponent
- * xm is 3bit extended precision value.
- */
-ieee754sp ieee754sp_format(int sn, int xe, unsigned xm)
-{
-	assert(xm);		/* we dont gen exact zeros (probably should) */
-
-	assert((xm >> (SP_MBITS + 1 + 3)) == 0);	/* no execess */
-	assert(xm & (SP_HIDDEN_BIT << 3));
-
-	if (xe < SP_EMIN) {
-		/* strip lower bits */
-		int es = SP_EMIN - xe;
-
-		if (ieee754_csr.nod) {
-			SETCX(IEEE754_UNDERFLOW);
-			return ieee754sp_zero(sn);
-		}
-
-		/* sticky right shift es bits 
-		 */
-		SPXSRSXn(es);
-
-		assert((xm & (SP_HIDDEN_BIT << 3)) == 0);
-		assert(xe == SP_EMIN);
-	}
-	if (xm & (SP_MBIT(3) - 1)) {
-		SETCX(IEEE754_INEXACT);
-		/* inexact must round of 3 bits 
-		 */
-		switch (ieee754_csr.rm) {
-		case IEEE754_RZ:
-			break;
-		case IEEE754_RN:
-			xm += 0x3 + ((xm >> 3) & 1);
-			/* xm += (xm&0x8)?0x4:0x3 */
-			break;
-		case IEEE754_RU:	/* toward +Infinity */
-			if (!sn)	/* ?? */
-				xm += 0x8;
-			break;
-		case IEEE754_RD:	/* toward -Infinity */
-			if (sn)	/* ?? */
-				xm += 0x8;
-			break;
-		}
-		/* adjust exponent for rounding add overflowing 
-		 */
-		if (xm >> (SP_MBITS + 1 + 3)) {	/* add causes mantissa overflow */
-			xm >>= 1;
-			xe++;
-		}
-	}
-	/* strip grs bits */
-	xm >>= 3;
-
-	assert((xm >> (SP_MBITS + 1)) == 0);	/* no execess */
-	assert(xe >= SP_EMIN);
-
-	if (xe > SP_EMAX) {
-		SETCX(IEEE754_OVERFLOW);
-		/* -O can be table indexed by (rm,sn) */
-		switch (ieee754_csr.rm) {
-		case IEEE754_RN:
-			return ieee754sp_inf(sn);
-		case IEEE754_RZ:
-			return ieee754sp_max(sn);
-		case IEEE754_RU:	/* toward +Infinity */
-			if (sn == 0)
-				return ieee754sp_inf(0);
-			else
-				return ieee754sp_max(1);
-		case IEEE754_RD:	/* toward -Infinity */
-			if (sn == 0)
-				return ieee754sp_max(0);
-			else
-				return ieee754sp_inf(1);
-		}
-	}
-	/* gen norm/denorm/zero */
-
-	if ((xm & SP_HIDDEN_BIT) == 0) {
-		/* we underflow (tiny/zero) */
-		assert(xe == SP_EMIN);
-		SETCX(IEEE754_UNDERFLOW);
-		return buildsp(sn, SP_EMIN - 1 + SP_EBIAS, xm);
-	} else {
-		assert((xm >> (SP_MBITS + 1)) == 0);	/* no execess */
-		assert(xm & SP_HIDDEN_BIT);
-
-		return buildsp(sn, xe + SP_EBIAS, xm & ~SP_HIDDEN_BIT);
-	}
-}