?? cbp_ppc.s
字號:
# Copyright (C) 2002 Guillaume Morin <guillaume@morinfr.org>, Alc魐e## This program 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### $Id$# $Source$# $Date$# $Author$## 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
?? 快捷鍵說明
復制代碼
Ctrl + C
搜索代碼
Ctrl + F
全屏模式
F11
切換主題
Ctrl + Shift + D
顯示快捷鍵
?
增大字號
Ctrl + =
減小字號
Ctrl + -