# Copyright (C) 2002 Guillaume Morin , 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_altivec.s,v 1.3 2002/11/17 00:57:57 edgomez Exp $ # $Source: /xvid/xvidcore/src/bitstream/ppc_asm/cbp_altivec.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 # 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 # break; # } # } # # if(codes[i][j]|codes[i][j+1]|codes[i][j+2]) # cbp |= 1 # # } # # return cbp; # #} .data .skip: .quad 0x0000FFFFFFFFFFFF,-1 .align 4 .text .global calc_cbp_altivec calc_cbp_altivec: # Set VRSAVE li %r4,0xFFFFFFFF mtspr 256,%r4 # r9 will contain coeffs addr mr %r9,%r3 # r3 contains the result, therefore we set it to 0 li %r3,0 # CTR is the loop counter (rows) li %r4,6 mtctr %r4 # VR9 contains 0 vxor 9,9,9 # VR10 will help us to remove the first 16 bits of each row lis %r4,.skip@ha addi %r4,4,.skip@l lvx 10,0,%r4 .loop: mr %r6,%r9 lvxl 1,0,%r6 # Set the first 16 bits to 0 vand 1,1,10 addi %r6,%r6,16 lvxl 2,0,6 addi %r6,%r6,16 lvxl 3,0,6 addi %r6,%r6,16 lvxl 4,0,6 addi %r6,%r6,16 lvxl 5,0,6 addi %r6,%r6,16 lvxl 6,0,6 addi %r6,%r6,16 lvxl 7,0,6 addi %r6,%r6,16 lvxl 8,0,6 vor 1,2,1 vor 1,3,1 vor 1,4,1 vor 1,5,1 vor 1,6,1 vor 1,7,1 vor 1,8,1 # is VR1 == 0 vcmpequw. 3,1,9 bt 24,.newline .cbp: # cbp calc mfctr %r5 subi %r5,%r5,1 li %r4,1 slw %r4,%r4,%r5 or %r3,%r3,%r4 .newline: addi %r9,%r9,128 bdnz .loop blr
