?? cbp_ppc.s
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# 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
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