#    Copyright (C) 2002 Guillaume Morin <guillaume@morinfr.org>, Alc魐e## *  This file is part of XviD, a free MPEG-4 video encoder/decoder# *# *  XviD is free software; you can redistribute it and/or modify it# *  under the terms of the GNU General Public License as published by# *  the Free Software Foundation; either version 2 of the License, or# *  (at your option) any later version.# *# *  This program is distributed in the hope that 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# *# *  Under section 8 of the GNU General Public License, the copyright# *  holders of XVID explicitly forbid distribution in the following# *  countries:# *# *    - Japan# *    - United States of America# *# *  Linking XviD statically or dynamically with other modules is making a# *  combined work based on XviD.  Thus, the terms and conditions of the# *  GNU General Public License cover the whole combination.# *# *  As a special exception, the copyright holders of XviD give you# *  permission to link XviD with independent modules that communicate with# *  XviD solely through the VFW1.1 and DShow interfaces, regardless of the# *  license terms of these independent modules, and to copy and distribute# *  the resulting combined work under terms of your choice, provided that# *  every copy of the combined work is accompanied by a complete copy of# *  the source code of XviD (the version of XviD used to produce the# *  combined work), being distributed under the terms of the GNU General# *  Public License plus this exception.  An independent module is a module# *  which is not derived from or based on XviD.# *# *  Note that people who make modified versions of XviD are not obligated# *  to grant this special exception for their modified versions; it is# *  their choice whether to do so.  The GNU General Public License gives# *  permission to release a modified version without this exception; this# *  exception also makes it possible to release a modified version which# *  carries forward this exception.# *##    $Id: cbp_ppc.s,v 1.10 2002/11/17 00:57:57 edgomez Exp $#    $Source: /xvid/xvidcore/src/bitstream/ppc_asm/cbp_ppc.s,v $#    $Date: 2002/11/17 00:57:57 $#    $Author: edgomez $##    This is my first PPC ASM attempt. So I might do nasty things.#    Please send any comments to <guillaume@morinfr.org># Returns a field of bits that indicates non zero ac blocks# for this macro block## uint32_t calc_cbp_c(const int16_t codes[6][64])#{#	uint32_t i, j;#	uint32_t cbp = 0;##	for (i = 0; i < 6; i++) {#		for (j = 1; j < 61; j+=4) {#			if (codes[i][j]  |codes[i][j+1]|#			    codes[i][j+2]|codes[i][j+3]) {#				cbp |= 1 << (5 - i);#				break;#			}#		}##		if(codes[i][j]|codes[i][j+1]|codes[i][j+2])#			cbp |= 1 << (5 - i);##	}##	return cbp;##}.data.skip:	.word 0,-1.align 4 .text.global calc_cbp_ppccalc_cbp_ppc:	# r9 will contain coeffs addr	mr %r9,%r3	# r8 is the loop counter (rows)	li %r8,5	# r3 contains the result, therefore we set it to 0	li %r3,0.loop:	# CTR is the loop2 counter	li %r4,16	mtctr %r4	# r6 is coeff pointer for this line	mr %r6,%r9	lis %r7,.skip@ha	addi %r7,%r7,.skip@l	lwz %r7,0(%r7).loop2:	# coeffs is a matrix of 16 bits cells	lwz %r4,0(%r6)	and %r4,%r4,%r7	li %r7,-1	lwz %r5,4(%r6)	# or. updates CR0	or. %r4,%r5,%r4	# testing bit 2 (is zero) of CR0	bf 2,.cbp	addi %r6,%r6,8	bdnz .loop2	b .newline.cbp:	li %r4,1	slw %r4,%r4,%r8	or %r3,%r3,%r4.newline:	addi %r9,%r9,128	# updates CR0, blabla	subic. %r8,%r8,1	bf 0,.loop	blr