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authorLinus Torvalds <torvalds@linux-foundation.org>2022-11-13 07:57:33 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2022-11-13 07:57:33 -0800
commitaf7a056891899fd3942afec79fb219f58271e319 (patch)
tree8a82fcc9ab06dad61e160841731916e9e3545c59 /arch/powerpc/kernel/vdso32/ssh:
parentMerge tag 'efi-fixes-for-v6.1-3' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi (diff)
parentMIPS: pic32: treat port as signed integer (diff)
Merge tag 'mips-fixes_6.1_1' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linuxHEADmaster
Pull MIPS fixes from Thomas Bogendoerfer: - fix jump label branch range check - check kmalloc failures in Loongson64 kexec - fix builds with clang-14 - fix char/int handling in pic32 * tag 'mips-fixes_6.1_1' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux: MIPS: pic32: treat port as signed integer MIPS: jump_label: Fix compat branch range check mips: alchemy: gpio: Include the right header MIPS: Loongson64: Add WARN_ON on kexec related kmalloc failed MIPS: fix duplicate definitions for exported symbols mips: boot/compressed: use __NO_FORTIFY
Diffstat (limited to 'arch/powerpc/kernel/vdso32/ssh:')
0 files changed, 0 insertions, 0 deletions
Copyright © 1996 – 2026 Jason A. Donenfeld. All Rights Reverse Engineered.
'>143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 
/* IEEE754 floating point arithmetic
 * double precision: common utilities
 */
/*
 * MIPS floating point support
 * Copyright (C) 1994-2000 Algorithmics Ltd.
 *
 * ########################################################################
 *
 *  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_add(ieee754dp x, ieee754dp y)
{
	COMPXDP;
	COMPYDP;

	EXPLODEXDP;
	EXPLODEYDP;

	CLEARCX;

	FLUSHXDP;
	FLUSHYDP;

	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 ieee754dp_nanxcpt(ieee754dp_indef(), "add", 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):
		if (xs == ys)
			return x;
		SETCX(IEEE754_INVALID_OPERATION);
		return ieee754dp_xcpt(ieee754dp_indef(), "add", 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 y;

	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 handling
		 */

	case CLPAIR(IEEE754_CLASS_ZERO, IEEE754_CLASS_ZERO):
		if (xs == ys)
			return x;
		else
			return ieee754dp_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):
		return y;

	case CLPAIR(IEEE754_CLASS_DNORM, IEEE754_CLASS_DNORM):
		DPDNORMX;

		/* FALL THROUGH */

	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 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;
		ym = XDPSRS(ym, s);
		ye += s;
	} else if (ye > xe) {
		/* have to shift x fraction right to align
		 */
		int s = ye - xe;
		xm = XDPSRS(xm, s);
		xe += s;
	}
	assert(xe == ye);
	assert(xe <= DP_EMAX);

	if (xs == ys) {
		/* generate 28 bit result of adding two 27 bit numbers
		 * leaving result in xm,xs,xe
		 */
		xm = xm + ym;
		xe = xe;
		xs = xs;

		if (xm >> (DP_MBITS + 1 + 3)) {	/* carry out */
			xm = XDPSRS1(xm);
			xe++;
		}
	} else {
		if (xm >= ym) {
			xm = xm - ym;
			xe = xe;
			xs = xs;
		} else {
			xm = ym - xm;
			xe = xe;
			xs = ys;
		}
		if (xm == 0)
			return ieee754dp_zero(ieee754_csr.rm ==
					      IEEE754_RD);

		/* normalize to rounding precision */
		while ((xm >> (DP_MBITS + 3)) == 0) {
			xm <<= 1;
			xe--;
		}

	}
	DPNORMRET2(xs, xe, xm, "add", x, y);
}