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

• Lines: 116
• Date: Wed Dec 31 16:00:00 1969
• Orig file: linux-2.4.19/arch/mips64/math-emu/sp_sqrt.c
• Orig date: Mon Jul 2 13:56:41 2001

diff -urN linux-2.4.19/arch/mips64/math-emu/sp_sqrt.c linux-2.4.20/arch/mips64/math-emu/sp_sqrt.c
@@ -1,115 +0,0 @@
-/* IEEE754 floating point arithmetic
- * single precision square root
- */
-/*
- * 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"
-
-static const struct ieee754sp_konst knan = {
-	0, SP_EBIAS + SP_EMAX + 1, 0
-};
-
-#define nan	((ieee754sp)knan)
-
-ieee754sp ieee754sp_sqrt(ieee754sp x)
-{
-	int sign = (int) 0x80000000;
-	int ix, s, q, m, t, i;
-	unsigned int r;
-	COMPXDP;
-
-	/* take care of Inf and NaN */
-
-	EXPLODEXDP;
-
-	/* x == INF or NAN? */
-	switch (xc) {
-	case IEEE754_CLASS_QNAN:
-	case IEEE754_CLASS_SNAN:
-		/* sqrt(Nan) = Nan */
-		return ieee754sp_nanxcpt(x, "sqrt");
-	case IEEE754_CLASS_ZERO:
-		/* sqrt(0) = 0 */
-		return x;
-	case IEEE754_CLASS_INF:
-		if (xs)
-			/* sqrt(-Inf) = Nan */
-			return ieee754sp_nanxcpt(nan, "sqrt");
-		/* sqrt(+Inf) = Inf */
-		return x;
-	case IEEE754_CLASS_DNORM:
-	case IEEE754_CLASS_NORM:
-		if (xs)
-			/* sqrt(-x) = Nan */
-			return ieee754sp_nanxcpt(nan, "sqrt");
-		break;
-	}
-
-	ix = x.bits;
-
-	/* normalize x */
-	m = (ix >> 23);
-	if (m == 0) {		/* subnormal x */
-		for (i = 0; (ix & 0x00800000) == 0; i++)
-			ix <<= 1;
-		m -= i - 1;
-	}
-	m -= 127;		/* unbias exponent */
-	ix = (ix & 0x007fffff) | 0x00800000;
-	if (m & 1)		/* odd m, double x to make it even */
-		ix += ix;
-	m >>= 1;		/* m = [m/2] */
-
-	/* generate sqrt(x) bit by bit */
-	ix += ix;
-	q = s = 0;		/* q = sqrt(x) */
-	r = 0x01000000;		/* r = moving bit from right to left */
-
-	while (r != 0) {
-		t = s + r;
-		if (t <= ix) {
-			s = t + r;
-			ix -= t;
-			q += r;
-		}
-		ix += ix;
-		r >>= 1;
-	}
-
-	if (ix != 0) {
-		switch (ieee754_csr.rm) {
-		case IEEE754_RP:
-			q += 2;
-			break;
-		case IEEE754_RN:
-			q += (q & 1);
-			break;
-		}
-	}
-	ix = (q >> 1) + 0x3f000000;
-	ix += (m << 23);
-	x.bits = ix;
-	return x;
-}