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# Copyright (C) 2002 Guillaume Morin, Alcôve |
# Copyright (C) 2002 Guillaume Morin <guillaume@morinfr.org>, Alcôve |
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# |
# |
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# This program is free software; you can redistribute it and/or modify |
# This program is free software; you can redistribute it and/or modify |
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# it under the terms of the GNU General Public License as published by |
# it under the terms of the GNU General Public License as published by |
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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# |
# |
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# |
# |
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# $Id: cbp_ppc.s,v 1.1 2002-03-21 23:42:53 canard Exp $ |
# $Id: cbp_ppc.s,v 1.7 2002-03-22 13:39:01 canard Exp $ |
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# $Source: /home/xvid/cvs_copy/cvs-server-root/xvid/xvidcore/src/bitstream/ppc_asm/cbp_ppc.s,v $ |
# $Source: /home/xvid/cvs_copy/cvs-server-root/xvid/xvidcore/src/bitstream/ppc_asm/cbp_ppc.s,v $ |
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# $Date: 2002-03-21 23:42:53 $ |
# $Date: 2002-03-22 13:39:01 $ |
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# $Author: canard $ |
# $Author: canard $ |
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# |
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# This is my first PPC ASM attempt. So I might do nasty things. |
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# Please send any comments to <guillaume@morinfr.org> |
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# Returns a field of bits that indicates non zero ac blocks |
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# for this macro block |
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# |
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#uint32_t calc_cbp_c(const int16_t codes[6][64]) |
#uint32_t calc_cbp_c(const int16_t codes[6][64]) |
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#{ |
#{ |
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# uint32_t i, j; |
# uint32_t i, j; |
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# uint32_t cbp = 0; |
# uint32_t cbp = 0; |
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# |
# |
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# for (i = 0; i < 6; i++) { |
# for (i = 0; i < 6; i++) { |
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# for (j = 1; j < 64/4; j+=4) { |
# for (j = 1; j < 61; j+=4) { |
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# if (codes[i][j] |codes[i][j+1]| |
# if (codes[i][j] |codes[i][j+1]| |
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# codes[i][j+2]|codes[i][j+3]) { |
# codes[i][j+2]|codes[i][j+3]) { |
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# cbp |= 1 << (5 - i); |
# cbp |= 1 << (5 - i); |
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# break; |
# break; |
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# } |
# } |
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# } |
# } |
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# |
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# if(codes[i][j]|codes[i][j+1]|codes[i][j+2]) |
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# cbp |= 1 << (5 - i); |
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# |
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# } |
# } |
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# |
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# return cbp; |
# return cbp; |
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# |
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#} |
#} |
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.text |
.text |
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.global calc_cbp_ppc |
.global calc_cbp_ppc |
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calc_cbp_ppc: |
calc_cbp_ppc: |
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# r9 will contain coeffs addr |
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mr 9,3 |
mr 9,3 |
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# r8 is the loop counter (rows) |
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li 8,5 |
li 8,5 |
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# r3 contains the result, therefore we set it to 0 |
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xor 3,3,3 |
xor 3,3,3 |
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.loop: |
.loop: |
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li 7,14 |
# CTR is the loop2 counter |
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li 4,15 |
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mtctr 4 |
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# r6 is coeff pointer for this line |
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mr 6,9 |
mr 6,9 |
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.loop2: |
.loop2: |
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lha 4,2(6) |
# coeffs is a matrix of 16 bits cells |
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lha 5,4(6) |
lwz 4,2(6) |
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or 4,5,4 |
lwz 5,6(6) |
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lha 5,6(6) |
# or. updates CR0 |
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or 4,5,4 |
or. 4,5,4 |
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lha 5,8(6) |
# testing bit 2 (is zero) of CR0 |
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or 4,5,4 |
bf 2,.cbp |
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cmpwi 4,0 |
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bne .cbp |
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addi 6,6,8 |
addi 6,6,8 |
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subi 7,7,1 |
bdnz .loop2 |
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cmpwi 7,-1 |
# latest line coeffs |
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beq .lastcoeffs |
lwz 4,2(6) |
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b .loop2 |
lhz 5,6(6) |
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.lastcoeffs: |
# or. updates CR0 |
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lha 4,2(6) |
or. 4,5,4 |
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lha 5,4(6) |
# testing bit 2 (is zero) of CR0 |
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or 4,5,4 |
bt 2,.newline |
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lha 5,6(6) |
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or 4,5,4 |
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cmpwi 4,0 |
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beq .newline |
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.cbp: |
.cbp: |
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li 4,1 |
li 4,1 |
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slw 4,4,8 |
slw 4,4,8 |
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or 3,3,4 |
or 3,3,4 |
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b .newline |
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.newline: |
.newline: |
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addi 9,9,128 |
addi 9,9,128 |
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subi 8,8,1 |
# updates CR0, blabla |
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cmpwi 8,-1 |
subic. 8,8,1 |
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bne .loop |
bf 0,.loop |
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.end: |
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blr |
blr |
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